Regulation No. 51-03

Name:Regulation No. 51-03
Description:Noise - Sound Emissions.
Official Title:Uniform Provisions Concerning the Approval of Motor Vehicles Having a Least Four Wheels with Regard to their Sound Emissions
Country:ECE - United Nations
Date of Issue:2016-02-05
Amendment Level:03 Series, Supplement 1
Number of Pages:81
Vehicle Types:Agricultural Tractor, Bus, Car, Heavy Truck, Light Truck
Subject Categories:Noise
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Keywords:

vehicle, test, annex, gear, speed, engine, regulation, sound, vehicles, type, paragraph, mass, acceleration, maximum, approval, target, point, series, amendments, conditions, reference, reported, line, ratio, level, condition, manufacturer, power, measurement, decimal, place, category, calculations, pressure, exhaust, system, date, rated, force, axle, entry, measurements, measured, rear, results, requirements, laden, permissible, means, calculation

Text Extract:

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E/ECE/324
) Rev.1/Add.50/Rev.3/Amend.1
E/ECE/TRANS/505 )
October 28, 2016
STATUS OF UNITED NATIONS REGULATION
ECE 51-03
UNIFORM PROVISIONS CONCERNING THE APPROVAL OF:
MOTOR VEHICLES HAVING AT LEAST FOUR WHEELS
WITH REGARD TO THEIR SOUND EMISSIONS
Incorporating:
02 series of amendments
Date of Entry into Force: 18.04.95
Supplement 1 to the 02 series of amendments
Date of Entry into Force: 05.05.96
Corr. 1 to the 02 series of amendments
Dated: 15.11.96
Corr. 2 to the 02 series of amendments
Dated: 11.03.98
Corr. 3 to the 02 series of amendments
Dated: 28.04.11
Supplement 2 to the 02 series of amendments
Date of Entry into Force: 07.02.99
Supplement 3 to the 02 series of amendments
Date of Entry into Force: 17.11.99
Corr. 1 to Supplement 3 to the 02 series of amendments
Dated: 07.03.01
Supplement 4 to the 02 series of amendments
Date of Entry into Force: 02.02.07
Supplement 5 to the 02 series of amendments
Date of Entry into Force: 18.06.07
Supplement 6 to the 02 series of amendments
Date of Entry into Force: 03.02.08
Supplement 7 to the 02 series of amendments
Date of Entry into Force: 30.01.11
Corr. 1 to Revision 2 of the Regulation
Dated: 14.03.12
Supplement 8 to the 02 series of amendments
Date of Entry into Force: 13.04.12
Supplement 9 to the 02 series of amendments
Date of Entry into Force: 03.11.13
Supplement 10 to the 02 series of amendments
Date of Entry into Force: 22.01.15
03 series of amendments
Date of Entry into Force: 20.01.16
Supplement 1 to the 03 series of amendments
Date of Entry into Force: 08.10.16

REGULATION NO. 51
UNIFORM PROVISIONS CONCERNING THE APPROVAL OF MOTOR VEHICLES HAVING AT
LEAST FOUR WHEELS WITH REGARD TO THEIR SOUND EMISSIONS
1. Scope
2. Definitions
3. Application for approval
4. Markings
5. Approval
6. Specifications
CONTENTS
7. Modifications and extension of approval of a vehicle type
8. Conformity of production
9. Penalties for non-conformity of production
10. Production definitively discontinued
11. Transitional provisions
12. Names and addresses of Technical Services responsible for conducting approval tests and of
Type Approval Authorities

REGULATION NO. 51
UNIFORM PROVISIONS CONCERNING THE APPROVAL OF MOTOR VEHICLES HAVING AT
LEAST FOUR WHEELS WITH REGARD TO THEIR SOUND EMISSIONS
1. SCOPE
This Regulation contains provisions on the sound emitted by motor vehicles and applies to
vehicles of Categories M and N.
The specifications in this Regulation are intended to reproduce the sound levels which are
generated by vehicles during normal driving in urban traffic.
2. DEFINITIONS
For the purposes of this Regulation,
2.1. "Approval of a vehicle" means the approval of a vehicle type with regard to sound;
2.2. "Vehicle type" means a category of motor vehicles which do not differ in such essential
respects as:
2.2.1. For vehicles tested according to Annex 3, Paragraph 3.1.2.1.
2.2.1.1. the shape or materials of the engine compartment and its soundproofing;
2.2.1.2. The type of engine (positive or compression ignition, two- or four-stroke, reciprocating or
rotary piston), number and capacity of cylinders, number and type of carburettors or
injection system, arrangement of valves, or the type of electric motor;
2.2.1.3. Rated maximum net power and corresponding rated engine speed(s); however if the rated
maximum net power and the corresponding rated engine speed differs only due to different
engine mappings, these vehicles may be regarded as from the same type;
2.2.1.4. The Silencing System.
2.2.2. For Vehicles Tested According to Annex 3, Paragraph 3.1.2.2.:
2.2.2.1. The shape or materials of the engine compartment and its soundproofing;
2.2.2.2. The type of engine (positive or compression ignition, two- or four-stroke, reciprocating or
rotary piston), number and capacity of cylinders, type of injection system, arrangement of
valves, rated engine speed (S), or the type of electric motor;
2.2.2.3. Vehicles having the same type of engine and/or different overall gear ratios may be
regarded as vehicles of the same type;

(l)
(m)
Lifting platforms, access ramps and similar equipment in running order, not
exceeding 200mm, provided that the loading capacity of the vehicle is not
increased;
Coupling devices for motor vehicles.
2.7. "Vehicle width" means a dimension which is measured according to ISO standard 612-
1978, term No. 6.2. In addition to the provisions of that standard, when measuring the
vehicle structural width the following devices shall not be taken into account:
(a)
(b)
(c)
(d)
(e)
Customs sealing devices and their protection;
Devices for securing the tarpaulin and their protection;
Tyre failure tell-tale devices;
Protruding flexible parts of a spray-suppression system;
Lighting equipment.
2.8. "Rated Maximum Net Power, P " means the engine power expressed in kW and
measured by the method pursuant to Regulation No. 85.
2.8.1. "Total engine power" means the sum of all power from available propulsion sources.
2.9. "Rated engine speed, S" means the declared engine speed in min-1 (rpm) at which the
engine develops its rated maximum net power pursuant to Regulation No. 85 or, where the
rated maximum net power is reached at several engine speeds, the highest one of those
speeds.
2.10. "Power to Mass Ratio index (PMR)" means a numerical quantity (see Annex 3, paragraph
3.1.2.1.1.) with no dimension used for the calculation of acceleration.
2.11. "Reference point" means one of the following points:
2.11.1. In the case of vehicles of Categories M , N and M ≤ 3,500kg technically permissible
maximum laden mass:
(a)
(b)
(c)
For front engine vehicles: the front end of the vehicle;
For mid-engine vehicles: the centre of the vehicle;
For rear engine vehicles: the rear end of the vehicle.
2.11.2. In the case of vehicles of Categories M > 3,500kg technical permissible maximum laden
mass, M , N , N :
(a)
(b)
For front-engine vehicles, the front end of the vehicle;
For all other vehicles, the border of the engine closest to the front of the vehicle;

2.21. "Exhaust silencing system of different types" means silencing systems which
significantly differ in respect of at least one of the following:
(a)
(b)
(c)
(d)
(e)
(f)
Trade names or trademarks of their components;
The characteristics of the materials constituting their components, except for the
coating of those components;
The shape or size of their components;
The operating principles of at least one of their components;
The assembly of their components;
The number of exhaust silencing systems or components.
2.22. "Replacement silencing system" means any part of the silencing system or its
components intended for use on a vehicle, other than a part of the type fitted to this vehicle
when submitted for type-approval pursuant to this Regulation.
2.23. "R-point" means R-point as defined in Paragraph 2.4. of Annex 1 to the Consolidated
Resolution on the Construction of Vehicles (R.E.3.).
2.24. Table of Symbols
Symbol Unit Annex Paragraph Explanation
m
m
kg
Annex 3
2.2.1.
mass in running order; value to be reported and used
for calculations to a precision of 10kg
kg
Annex 3
2.2.1.
test mass of the vehicle; value to be reported and
used for calculations to a precision of 10kg
m
kg
Annex 3
2.2.1.
target mass of the vehicle
m
kg
Annex 3
2.2.1.
extra loading
m
kg
Annex 3
2.2.1.
front axle load in unladen condition
m
kg
Annex 3
2.2.1.
rear axle load in unladen condition
m
kg
Annex 3
2.2.1.
unladen vehicle mass
m
kg Annex 3 2.2.1. Technically permissible maximum laden mass
allowed for the rear axle as declared by the
manufacturer
m kg Annex 3 2.2.1. mass of driver
m kg Annex 3 2.2.1. mass of the incomplete vehicle (M or M )
m
kg
Annex 3 2.2.1.
extra load to be added to the incomplete vehicle (M
or M ) to reach the mass of the vehicle in running
order as chosen by the manufacturer
m kg Annex 3 2.2.7.2. front axle load in laden condition
m kg Annex 3 2.2.7.2. rear axle load in laden condition

Symbol Unit Annex Paragraph Explanation
a
m/s
Annex 3
3.1.2.1.2.4.
reference acceleration for the wide-open-throttle test;
value to be reported and used for calculations to the
second decimal place
kP

Annex 3
3.1.2.1.3.
partial power factor; value to be reported and used for
calculations to the second decimal place
a
m/s
Annex 3
3.1.2.1.4.1.
acceleration at wide-open-throttle in gear ratio i; value
to be reported and used for calculations to the second
decimal place
a
m/s
Annex 3
3.1.2.1.4.1.
acceleration at wide-open-throttle in gear ratio (i + 1);
value to be reported and used for calculations to the
second decimal place
gear ratio i — Annex 3 3.1.2.1.4.1. first of two gear ratios for use in the vehicle test
gear ratio i + 1

Annex 3
3.1.2.1.4.1.
second of two gear ratios, with an engine speed lower
than gear ratio i
k

Annex 3
3.1.2.1.4.1.
gear ratio weighting factor; value to be reported and
used for calculations to the second decimal place
n
1/min
Annex 3
3.1.2.2.
engine rotational speed of the vehicle, when the
reference point passes BB'; value to be reported and
used for calculations to a precision of 10 min -1
S
1/min
Annex 3
3.1.2.2.
rated engine rotational speed in revs per minute,
synonymous with the engine rotational speed at
maximum power
n
1/min
Annex 3
3.1.2.2.1.1.(a)
target engine rotational speed of the vehicle when the
reference point has to pass line BB' (see 2.11.2. for
definition of reference point)
v
km/h
Annex 3
3.1.2.2.1.1.(a)
target vehicle velocity when it is necessary that the
reference point has to pass line BB' (see 2.11.2. for
definition of reference point)
v
km/h
Annex 3
3.1.2.2.1.1.(b)
target vehicle velocity when certain conditions are
met
v
km/h
Annex 3
3.1.2.2.1.1. (c)
target vehicle velocity when certain conditions are
met
gear
-
Annex 3
3.1.2.2.1.1. (d)
first of two gear ratios used for testing of M having a
maximum authorized mass of more than 3,500kg, M ,
N , and N where certain criteria on test conditions
are met
gear
-
Annex 3
3.1.2.2.1.1. (d)
second of two gear ratios used for testing of M
having a maximum authorized mass of more than
3,500 kg, M , N , and N where certain criteria on test
conditions are met
v
km/h
Annex 3
3.1.2.2.1.1. (d)
target vehicle velocity when certain conditions are
met
v
km/h
Annex 3
3.1.2.2.1.1. (d)
target vehicle velocity when certain conditions are
met

Symbol Unit Annex Paragraph Explanation
L
dB(A)
Annex 7 2.6.
sound pressure level measured for a gear κ and at a
test point j; value to be reported and used for
calculations to the first decimal place
n
1/min
Annex 7
2.6.
vehicle test engine speed at BB' for a gear κ and at
test point j
v
km/h
Annex 7
2.6.
vehicle test speed at AA' for a gear κ and at test point
j; value to be reported and used for calculations to the
first decimal place
v
km/h
Annex 7
2.6.
vehicle test speed at BB' for a gear κ and at test point
j; value to be reported and used for calculations to the
first decimal place
L
dB(A)
Annex 7 3.1.
reported vehicle sound pressure level for gear ratio i
from Annex 3; value to be reported and used for
calculations to the first decimal place
n
1/min
Annex 7
3.1.
reported vehicle engine speed for gear ratio i from
Annex 3
v
km/h
Annex 7
3.1.
reported vehicle test speed for gear ratio i at BB’ from
Annex 3; value to be reported and used for
calculations to the first decimal place
L
dB(A)
Annex 7 4.
sound pressure level measured for a gear κ and at a
test point j; value to be reported and used for
calculations to the first decimal place
L
dB(A)
Annex 7 5.3.
reference sound pressure level for reference sound
assessment; value to be reported and used for
calculations to the first decimal place
n 1/min Annex 7 5.3. reference engine speed for reference sound
assessment
v
km/h
Annex 7 5.3.
reference vehicle test speed for reference sound
assessment
k

Annex 7 6.2.
partial power factor determined for the L
principle
of ASEP
L
dB(A)
Annex 7
6.2.
vehicle sound pressure level measured for the L
principle of ASEP; value to be reported and used for
calculations to the first decimal place
L dB(A) Annex 7 6.2. Estimated urban sound pressure level determined for
the L principle of ASEP; value to be reported and
used for calculations to the first decimal place
L dB(A) Annex 7 6.2. interim result for calculation of L ; value to be
reported and used for calculations to the first decimal
place
L dB(A) Annex 7 6.2. interim result for calculation of L ; value to be
reported and used for calculations to the first decimal
place

5. APPROVAL
5.1. Type approval shall only be granted if the vehicle type meets the requirements of
Paragraphs 6. and 7. below.
5.2. An approval number shall be assigned to each type approved. Its first two digits (at present
03 corresponding to the 03 series of amendments) shall indicate the series of amendments
incorporating the most recent major technical amendments made to the Regulation at the
time of issue of the approval. The same Contracting Party shall not assign the same number
to another vehicle type.
5.3. Notice of approval or of extension or of refusal or withdrawal of approval or of production
definitively discontinued of a vehicle type pursuant to this Regulation shall be communicated
to the Parties to the Agreement applying this Regulation, by means of a form conforming to
the model in Annex 1 to this Regulation.
5.4. There shall be affixed, conspicuously and in a readily accessible place specified on the
approval form, to every vehicle conforming to a vehicle type approved under this Regulation
an international approval mark consisting of:
5.4.1. A circle surrounding the letter "E" followed by the distinguishing number of the country which
has granted approval;
5.4.2. The number of this Regulation, followed by the letter "R", a dash and the approval number
to the right of the circle prescribed in Paragraph 5.4.1.
5.5. If the vehicle conforms to a vehicle type approved under one or more other Regulations
annexed to the Agreement, in the country which has granted approval under this
Regulation, the symbol prescribed in Paragraph 5.4.1. need not be repeated; in such a case
the regulation and approval numbers and the additional symbols of all the Regulations
under which approval has been granted in the country which has granted approval under
this Regulation shall be placed in vertical columns to the right of the symbol prescribed in
Paragraph 5.4.1.
5.6. The approval mark shall be clearly legible and be indelible.
5.7. The approval mark shall be placed close to or on the vehicle data plate affixed by the
manufacturer.
5.8. Annex 2 to this Regulation gives examples of arrangements of the approval mark.
6. SPECIFICATIONS
6.1. General Specifications
6.1.1. The vehicle, its engine and its sound reduction system shall be so designed, constructed
and assembled as to enable the vehicle, in normal use, despite the vibration to which it may
be subjected, to comply with the provisions of this Regulation.

6.2.2. Sound Level Limits
The sound level measured in accordance with the provisions of Annex 3 to this Regulation,
mathematically rounded to the nearest integer value, shall not exceed the following limits:
Vehicle
Category
M
Vehicles used for the Carriage of
Passengers
Limit Values (dB(A))
Phase 1 Phase 2 Phase 3
PMR ≤ 120 72 70 68
120 < PMR ≤ 160 73 71 69
PMR > 160 75 73 71
PMR > 200, no. of seats ≤ 4, R-point height
< 450mm from the ground
75 74 72
M ≤ 2.5t 72 70 69
M
2.5t < M ≤ 3.5t 74 72 71
M > 3.5t; P ≤ 135kW 75 73 72
M > 3.5t; P > 135kW 75 74 72
Pn ≤ 150kW 76 74 73
M
150kW < P ≤ 250kW 78 77 76
P > 250kW 80 78 77
Vehicle
Category
N
N
Vehicles used for the carriage of goods
Phase 1
Phase 2
Phase 3
M ≤ 2.5t
72
71
69
M > 2.5 t
74
73
71
Pn ≤ 135kW
77
75
74
Pn > 135 kW
78
76
75
P ≤ 150kW 79 77 76
N
150kW < P ≤ 250kW 81 79 77
P > 250kW 82 81 79
6.2.2.1. For vehicle types of Category M derived from N vehicle types having a technically
permissible maximum laden mass above 2.5t and a R-point height greater than 850mm
from the ground, the limits of vehicles types of Category N having a technically permissible
maximum laden mass above 2.5t apply.
6.2.2.2. For vehicle types designed for off-road use, the limit values shall be increased by 2dB(A)
for M and N vehicles category and 1dB(A) for any other vehicle category.
For vehicle types of category M1 the increased limit values for off-road vehicles are only
valid if the technically permissible maximum laden mass > 2t.

6.2.3.2. The vehicle shall meet the requirements of Annex 7 to this Regulation.
6.2.3.3. In applying for type approval, the manufacturer shall provide a statement, in conformity with
the Appendix of Annex 7, that the vehicle type to be approved complies with the
requirements of Paragraph 6.2.3. of this Regulation.
6.3. Specifications Regarding Exhaust Systems Containing Fibrous Materials
6.3.1. Requirements of Annex 4 shall be applied.
7. MODIFICATION AND EXTENSION OF APPROVAL OF A VEHICLE TYPE
7.1. Every modification of the vehicle type shall be notified to the Type Approval Authority which
approved the vehicle type. The Type Approval Authority may then either:
7.1.1. Consider that the modifications made are unlikely to have an appreciable adverse effect and
that in any case the vehicle still complies with the requirements, or
7.1.2. Require a further test report from the Technical Service responsible for conducting the tests.
7.2. Confirmation or refusal of approval, specifying the alterations shall be communicated by the
procedure specified in Paragraph 5.3. above to the Parties to the Agreement applying this
Regulation.
7.3. The Type Approval Authority issuing the extension of approval shall assign a series number
for such an extension and inform thereof the other Parties to the 1958 Agreement applying
this Regulation by means of a communication form conforming to the model in Annex 1 to
this Regulation.
8. CONFORMITY OF PRODUCTION
8.1. The conformity of production procedures shall comply with those set out in the Agreement,
Appendix 2 (E/ECE/324-E/ECE/TRANS/505/Rev.2) with the following requirements:
8.1.1. Vehicles approved according to this Regulation shall be so manufactured as to conform to
the type approved by meeting the requirements of Paragraph 6. above.
8.1.2. The minimum requirements for conformity of production control procedures of Annex 6 to
this Regulation shall be complied with.
8.2. The authority which has granted type approval may at any time verify the conformity control
methods applied in each production facility. The normal frequency of these verifications
shall be one every two years.
9. PENALTIES FOR NON-CONFORMITY OF PRODUCTION
9.1. The approval granted in respect of a vehicle type pursuant to this Regulation may be
withdrawn if the requirements set forth above are not met.
9.2. If a Contracting Party to the Agreement applying this Regulation withdraws an approval it
has previously granted, it shall forthwith so notify the other Contracting Parties applying this
Regulation, by means of a communication form conforming to the model in Annex 1 to this
Regulation.

11.3. Transitional Provisions for Phase 2 (see Paragraph 6.2.2. above)
11.3.1. As from July 1, 2020 for vehicle types other than N and as from July 1, 2022 for vehicles
types of Category N , Contracting Parties applying this Regulation shall grant type
approvals only if the vehicle type to be approved meets the requirements of phase 2
(see Paragraph 6.2.2. above) of this Regulation as amended by the 03 series of
amendments.
Furthermore, as from the official date of entry into force of the 03 series of amendments,
Contracting Parties applying this Regulation shall grant type approvals to the vehicle type
which meets the requirements of phase 3 of this Regulation as amended by the 03 series of
amendments.
11.3.2. Contracting Parties applying this Regulation shall not refuse to grant extensions of type
approvals for existing types which have been granted according to phase 1 (see
Paragraph 6.2.2. above) or the 02 series of amendments to this Regulation.
11.3.3. Until June 30, 2022 for vehicle types other than N and until June 30, 2023 for vehicles
types of Category N , no Contracting Party applying this Regulation shall refuse national or
regional type approval of a vehicle type-approved to phase 1 (see Paragraph 6.2.2. above)
or the 02 series of amendments to this Regulation.
11.3.4. As from July 1, 2022 for vehicle types other than N and as from July 1, 2023 for vehicles
types of Category N , Contracting Parties applying this Regulation shall not be obliged to
accept for the purpose of national or regional type approval, a vehicle type approved to
phase 1 (see Paragraph 6.2.2.1. above) or the preceding series of amendments to this
Regulation.
11.3.5. Even after the date of entry into force of the 03 series of amendments to this Regulation,
Contracting Parties applying this Regulation may continue for national or regional purposes
granting type approvals and extensions of type approvals to phase 1 (see Paragraph 6.2.2.
above) or the preceding series of amendments to this Regulation.
11.4. Transitional Provisions for Phase 3 (see Paragraph 6.2.2. above)
11.4.1. As from July 1, 2024 for vehicle types other than N , N and M and as from July 1, 2026 for
vehicles types of Category N , N and M , Contracting Parties applying this Regulation shall
grant type-approvals only if the vehicle type to be approved meets the requirements of
phase 3 (see Paragraph 6.2.2. above) of this Regulation as amended by the 03 series of
amendments.
11.4.2. Contracting Parties applying this Regulation shall not refuse to grant extensions of type
approvals for existing types which have been granted according to phase 2 according to
Paragraph 6.2.2. above.
11.4.3. Until June 30, 2026 for vehicle types other than N , N and M and until June 30, 2027 for
vehicles types of Category N , N and M , no Contracting Party applying this Regulation
shall refuse national or regional type approval of a vehicle type-approved to phase 2
according to Paragraph 6.2.2. above.

ANNEX 1
COMMUNICATION
(Maximum format: A4 (210 × 297mm))
issued by:
Name of administration:
.....................................
.....................................
.....................................
concerning:
APPROVAL GRANTED
APPROVAL EXTENDED
APPROVAL REFUSED
APPROVAL WITHDRAWN
PRODUCTION DEFINITIVELY DISCONTINUED
of a vehicle type with regard to its sound emission pursuant to Regulation No. 51
Approval No. .................................................. Extension No. ................................
Section I
0.1. Make (trade name of manufacturer) ..........................................................................................
0.2. Type: ..........................................................................................................................................
0.3. Means of identification of type if marked on the vehicle: ........................................................
0.3.1. Location of that marking: ............................................................................................................
0.4. Category of vehicle: ...............................................................................................................
0.4.1. Subcategory according to Paragraph 6.2.2., the 2nd column of the table and the
Paragraphs 6.2.2.1. to 6.2.2.5. ..................................................................................................
0.5. Company name and address of manufacturer: .........................................................................
0.6. Names and Address(es) of assembly plant(s): ..........................................................................
0.7. Name and address of the manufacturer's representative (if any): .............................................

ANNEX 1 – APPENDIX 1
ADDENDUM TO THE COMMUNICATION FORM NO …
1. ADDITIONAL INFORMATION
1.1. Power Plant
1.1.1. Manufacturer of the engine: .......................................................................................................
1.1.2. Manufacturer's engine code: .....................................................................................................
1.1.3. Rated maximum net power: ........................... kW at .................. min or maximum continuous
rated power (electric motor) ........................... kW
1.1.4. Pressure charger(s), Make and Type: .......................................................................................
1.1.5. Air filter, Make and Type: ...........................................................................................................
1.1.6. Intake silencer(s), Make and Type: ............................................................................................
1.1.7. Exhaust Silencer(s), Make and Type: ........................................................................................
1.1.8. Catalyst(s), Make and Type: ......................................................................................................
1.1.9. Particulate Trap(s), Make and Type: ..........................................................................................
1.2. Transmission
1.2.1. Type (mechanical, hydraulic, electric, etc.): ...............................................................................
1.3. Non-engine devices designed to reduce noise: .........................................................................
2. TEST RESULTS
2.1. Sound level of moving vehicle: ........................................................................................ dB(A)
2.2. Sound level of stationary vehicle: ..................................... dB(A) at .................................. min
2.2.1. Sound level of compressed air, service brake: ................................................................ dB(A)
2.2.2. Sound level of compressed air, parking brake: ................................................................ dB(A)
2.2.3. Sound level of compressed air, during the pressure regulator actuation: .................. …..dB(A)
2.3. Data to Facilitate in-use Compliance Test of Hybrid Vehicles, where an Internal
Combustion Engine Cannot Operate when the Vehicle is Stationary
2.3.1. Gear (i) or position of the gear selector chosen for the test:
2.3.2. Position of the operating switch during measurement L , (if switch is fitted)
2.3.3. Pre-acceleration length l (Point of the acceleration depression in meter before line AA')

ANNEX 1 – APPENDIX 2
TECHNICAL INFORMATION DOCUMENT
0.
GENERAL
0.1.
Make (trade name of manufacturer): .........................................................................................
0.2.
Means of identification of type, if marked on the vehicle:
......................................................
0.2.1.
Location of that marking: ...........................................................................................................
0.3.
Category of vehicle:
...............................................................................................................
0.4.
Company name and address of manufacturer: .........................................................................
0.5.
Name and address of the manufacturer's representative (if any): .............................................
0.6.
Name(s) and address(es) of assembly plant(s): ........................................................................
1.
GENERAL CONSTRUCTION CHARACTERISTICS OF THE VEHICLE
1.1.
Photographs and/or drawings of a representative vehicle: .......................................................
1.2.
Number of axles and wheels:
..................................................................................................
1.2.1.
Powered axles (number, position, interconnection): ..................................................................
1.3.
Position and arrangement of the engine: ...................................................................................
2.
Masses and dimensions
(in kg and mm) (Refer to drawing where applicable): .....................
2.1.
Range of vehicle dimensions (overall):......................................................................................
2.1.1.
For chassis without bodywork: ...................................................................................................
2.1.1.1.
Length: .......................................................................................................................................
2.1.1.2.
Width: .........................................................................................................................................

3.2.2. Fuel Feed
3.2.2.1. By fuel injection (compression ignition only): yes/no
3.2.2.1.1. Working principle: Direct injection/pre-chamber/swirl chamber
3.2.2.1.2. Governor
3.2.2.1.2.1. Type: ..........................................................................................................................................
3.2.2.1.2.2. Speed at which Cut-off starts under load: ......................................................................... min
3.2.2.2. By fuel injection (positive ignition only): yes/no
3.2.2.2.1. Working principle: Intake manifold (single-/multi-point )/direct injection/other (specify)
3.2.3. Intake System
3.2.3.1. Air filter, drawings, or
3.2.3.1.1. Make(s): .....................................................................................................................................
3.2.3.1.2. Type(s): ......................................................................................................................................
3.2.3.2. Intake Silencer, Drawings,
3.2.3.2.1. Make(s): .....................................................................................................................................
3.2.3.2.2. Type(s): ......................................................................................................................................
3.2.4. Exhaust System
3.2.4.1. Description and/or drawing of the exhaust system: ..................................................................
3.2.4.2. Exhaust silencer(s): ....................................................................................................................
Type, marking of exhaust silencer(s): ........................................................................................
Where relevant for exterior noise, reducing measures in the engine compartment and on the
engine: .......................................................................................................................................
3.2.4.3. Location of the exhaust outlet: ...................................................................................................
3.2.4.4. Exhaust silencer containing fibrous materials: ..........................................................................
3.2.5. Catalytic convertor: yes/no
3.2.5.1. Number of catalytic convertors and elements (provide the information below for each
separate unit): ............................................................................................................................

4.2. Gear Ratios
Gear
Internal Gearbox Ratios
(ratios of engine to gearbox
output shaft revolutions)
Final Drive Ratio(s)
(ratio of gearbox
output shaft to driven
wheel revolutions)
Total Gear Ratios
Maximum for CVT
1
2
3

Minimum for CVT
Reverse
4.3.
Maximum vehicle design speed (in km/h):
..............................................................................
5.
SUSPENSION
5.1.
Tyres and Wheels
5.1.1.
Tyre/Wheel Combination(s)
(a)
(b)
For tyres indicate size designation, load-capacity index and speed category
symbol;
For wheels indicate rim size(s) and off-set(s).
5.1.2.
Upper and lower limits of rolling radii
5.1.2.1.
Axle 1: ........................................................................................................................................
5.1.2.2.
Axle 2: ........................................................................................................................................
5.1.2.3.
Axle 3: ........................................................................................................................................
5.1.2.4.
Axle 4: ........................................................................................................................................
etc.
6.
BODYWORK
6.1.
Type of bodywork: ......................................................................................................................
6.2.
Materials used and methods of construction: ............................................................................

ANNEX 2
ARRANGEMENTSS OF THE APPROVAL
MARK
Model A
(See Paragraph 5.4. of this Regulation)
a = 8mm min.
The above approval mark affixed to a vehicle shows that the vehicle type t concerned has, with
regard to
its noise emission, been approved
in the Netherlands (E 4)
pursuant too Regulation No. 51 under approval
No. 032439.
The first two digits of the approvall number indicate that Regulation No. 51 already included the
03 series
of amendments when the approval was granted.
Model B
(See Paragraph 5.5. of this Regulation)
a = 8mm min.
The above approval mark affixed to a vehicle shows that the vehicle type concerned has been
approved
in the Netherlands (E 4) pursuant to Regulations Nos. 51 and 33. The approval numbers indicate that,
at the dates when the
respective approvals were granted, Regulationn No. 51 included the 03
series of
amendments while Regulation No. 33 was in its original form.
1

1.4. Instrumentation for Speed Measurements
The engine speed shall be measured with instrumentation having an accuracy of ±2% or
better at the engine speeds required for the measurements being performed.
The road speed of the vehicle shall be measured with instrumentation having an
accuracy of at least ±0.5km/h, when using continuous measurement devices.
If testing uses independent measurements of speed, this instrumentation shall meet
specification limits of at least ±0.2km/h.
1.5. Meteorological Instrumentation
The meteorological instrumentation used to monitor the environmental conditions during
the test shall include the following devices, which meet at least the given accuracy:
(a)
(b)
(c)
Temperature measuring device, ±1°C;
Wind speed-measuring device, ±1.0m/s;
Barometric pressure measuring device, ±5hPa;
(d) A relative humidity measuring device, ±5%.
2. CONDITIONS OF MEASUREMENT
2.1. Test Site and Ambient Conditions
The surface of the test track and the dimensions of the test site shall be in accordance
with ISO 10844:2014.
The surface of the site shall be free of powdery snow, tall grass, loose soil or cinders.
There shall be no obstacle which could affect the sound field within the vicinity of the
microphone and the sound source. The observer carrying out the measurements shall so
position themself as not to affect the readings of the measuring instrument.
Measurements shall not be made under adverse weather conditions. It shall be ensured
that the results are not affected by gusts of wind.
The meteorological instrumentation should be positioned adjacent to the test area at a
height of 1.2m ± 0.02m. The measurements shall be made when the ambient air
temperature is within the range from 5°C to 40°C.
The tests shall not be carried out if the wind speed, including gusts, at microphone height
exceeds 5 m/s, during the sound measurement interval.
A value representative of temperature, wind speed and direction, relative humidity, and
barometric pressure shall be recorded during the sound measurement interval.
Any sound peak which appears to be unrelated to the characteristics of the general
sound level of the vehicle shall be ignored in taking the readings.

Vehicle Category
Vehicle test mass
M m = m ±5%
N m = m ±5%
N , N m = 50 [kg/kW] × P [kW]
Extra loading, m , to reach the target mass, m , of the
vehicle shall be placed above the rear axle(s).
The sum of the extra loading and the rear axle load in an
unladen condition, m
, is limited to 75% of the
technically permissible maximum laden mass allowed for the
rear axle, m . The target mass shall be achieved with a
tolerance of ±5%.
If the centre of gravity of the extra loading cannot be aligned
with the centre of the rear axle, the test mass, m , of the vehicle
shall not exceed the sum of the front axle in an unladen
condition, m
, and the rear axle load in an unladen
condition, m
plus the extra loading, m
, and the
mass of the driver m .
The test mass for vehicles with more than two axles shall be the
same as for a two-axle vehicle.
If the vehicle mass of a vehicle with more than two axles in an
unladen condition, m , is greater than the test mass for the
two-axle vehicle, then this vehicle shall be tested without extra
loading.
M , M
If the vehicle mass of a vehicle with two axles, m , is
greater than the target mass, then this vehicle shall be tested
without extra loading.
m = m
The mass in running order shall be achieved with a tolerance of
±10%.
Incomplete
M , M
If the tests are carried with an incomplete vehicle not having a
bodywork,
m = 50 [kg/kW] × P [kW] is calculated in compliance with
conditions above (see N , N category),
or
m = m + m = m
The mass in running order shall be achieved with a tolerance of
±10%.

The vehicle mass of the test vehicle in the unladen condition, m , is calculated by
measuring on a scale the unladen front axle load, m , and the unladen rear axle
load, m , as given in Formula (3):
m = m + m (3)
By using Formulae (2) and (3), the extra loading, m
Formulae (4) and (5):
, is calculated as given in
m = m – (m + m ) (4)
m = m − (m + m + m ) (5)
The sum of the extra loading, m , and the unladen rear axle load, m , is
limited to 75% of the technically permissible maximum laden mass for the rear axle, m
, as given in Formula (6):
0.75m ≥ m + m (6)
The m is limited according to Formula (7):
m ≤ 0.75 m − m (7)
If the calculated extra loading, m , in Formula (5) fulfils Formula (7), then the extra
loading is equal to Formula (5). The test mass, m , of the vehicle is as calculated from
Formula (8):
m = m + m + m + m (8)
In this case, the test mass of the vehicle is equal to the target mass
m = m (9)
If the calculated extra loading, m
fulfils Formula (10)
, in Formula (5) does not fulfil Formula (7), but rather
m > 0.75m − m (10)
then, the extra loading, m , shall be as given by Formula (11):
m = 0.75 m − m (11)
and the test mass, m , of the vehicle shall be as given by Formula (12):
m = 0.75 m + m + m (12)
In this case, the test mass of the vehicle is lower than the target mass
m < m (13)

3.1.2. Specific Test Conditions for Vehicles
3.1.2.1. Vehicles of Category M , N and M ≤ 3,500kg technically permissible maximum laden
mass:
The path of the centreline of the vehicle shall follow line CC' as closely as possible
throughout the entire test, from the approach to line AA' until the rear of the vehicle
passes line BB'. If the vehicle is fitted with more than two-wheel drive, test it in the drive
selection which is intended for normal road use.
If the vehicle is fitted with an auxiliary manual transmission or a multi-gear axle, the
position used for normal urban driving shall be used. In all cases, the gear ratios for slow
movements, parking or braking shall be excluded.
The test mass of the vehicle shall be according to the table of Paragraph 2.2.1.
The test speed v is 50km/h ± 1km/h. The test speed shall be reached, when the
reference point is at line PP'.
If the test speed is modified according to Paragraph 3.1.2.1.4.1.(e) of Annex 3 to this
Regulation, the modified test speed shall be used for both the acceleration and constant
speed test.
3.1.2.1.1. Power to mass ratio index (PMR)
PMR is defined as follows:
PMR = (P / m ) * 1,000kg/kW, where P is measured in kW and m is measured in kg
according to Paragraph 2.2.1. of this Annex.
If two or more sources of propulsive power operate at the conditions of test specified in
Paragraph 3.1.2.1 of Annex 3 to this Regulation, the total engine net power, P , shall be
the arithmetic sum of parallel propulsive engines on the vehicle. Applicable parallel
propulsive engines are those power sources which provide forward motion to the vehicle
in combination at the conditions of test specified in Paragraph 3.1.2.1. of Annex 3 to this
Regulation.
Specified power for non-combustion engines shall be the power stated by the
manufacturer.
The PMR with no dimension is used for the calculation of acceleration.

Pre-acceleration shall not be used.
The location of depressing the accelerator shall be where the reference point of the
vehicle passes line AA'.
3.1.2.1.2.3. Target Acceleration
The target acceleration a defines the typical acceleration in urban traffic and is
derived from statistical investigations. This function depends on the PMR of a vehicle.
The target acceleration a is defined by:
a = 0.63 * log (PMR) - 0.09
3.1.2.1.2.4. Reference Acceleration
The reference acceleration a defines the required acceleration during the
acceleration test on the test track. It is a function depending on the power-to-mass ratio
of a vehicle. That function is different for specific vehicle categories.
The reference acceleration a is defined by:
a = 1.59 * log (PMR) -1.41 for PMR ≥ 25
a = a = 0.63 * log10 (PMR) - 0.09 for PMR < 25
3.1.2.1.3. Partial Power Factor k
The partial power factor k (see Paragraph 3.1.3.1.) is used for the weighted combination
of the test results of the acceleration test and the constant speed test for vehicles of
Category M and N and M ≤ 3,500kg technically permissible maximum laden mass
In cases other than a single gear test, a shall be used instead of a
(see Paragraph 3.1.3.1.).
3.1.2.1.4. Gear Ratio Selection
The selection of gear ratios for the test depends on their specific acceleration potential
a under full throttle condition, according to the reference acceleration a required
for the full throttle acceleration test.
If the vehicle allows different transmission setups like automatic or manual gear selection
and/or has different software programs or modes (e.g. sporty, winter, adaptive) leading
to valid accelerations, the vehicle manufacturer shall prove to the satisfaction of the
Technical Service, that the vehicle is tested in the mode which achieves an acceleration
being closest to a .
The vehicle transmission, gear, or gear ratio may be controlled by electronic or
mechanical measures to avoid the activation of a kick-down function."
Appendix 3, Figure 3a to Figure 3e, give gear selection criteria and test run criteria for
Categories M and M having a technically permissible maximum laden mass not
exceeding 3,500kg and for Category N , in a flowchart form as an aid to test operation.

The achieved acceleration a shall be greater or equal to a .
If possible, the manufacturer shall take measures to avoid an acceleration value a
greater than 2.0m/s .
The achieved acceleration a is then used for the calculation of the partial power
factor k (see Paragraph 3.1.2.1.3.) instead a .
3.1.2.1.5. Acceleration Test
The manufacturer shall define the position of the reference point in front of line AA' of
fully depressing the accelerator. The accelerator shall be fully depressed (as rapidly as is
practicable) when the reference point of the vehicle reaches the defined point. The
accelerator shall be kept in this depressed condition until the rear of the vehicle reaches
line BB'. The accelerator shall then be released as rapidly as possible. The point of fully
depressing the accelerator shall be reported in Addendum to the Communication form
(Annex 1, Appendix 1). The Technical Service shall have the possibility of pretesting.
In the case of articulated vehicles consisting of two non-separable units regarded as a
single vehicle, the semi-trailer shall be disregarded in determining when line BB' is
crossed.
3.1.2.1.6. Constant Speed Test
The constant speed test shall be carried out with the same gear(s) specified for the
acceleration test and a constant speed of 50km/h with a tolerance of ±1km/h between
AA' and BB'. During the constant speed test the acceleration control shall be positioned
to maintain a constant speed between AA' and BB' as specified. If the gear is locked for
the acceleration test, the same gear shall be locked for the constant speed test.
The constant speed test is not required for vehicles with a PMR < 25.
3.1.2.2. Vehicles of Categories M > 3,500kg technically permissible maximum laden mass, M ,
N , N :
The path of the centreline of the vehicle shall follow line CC' as closely as possible
throughout the entire test, from the approach to line AA' until the rear of the vehicle
passes line BB'. The test shall be conducted without a trailer or semi-trailer. If a trailer is
not readily separable from the towing vehicle the trailer shall be ignored when
considering the crossing of line BB'. If the vehicle incorporates equipment such as a
concrete mixer, a compressor, etc., this equipment shall not be in operation during the
test. The test mass of the vehicle shall be according to the table of Paragraph 2.2.1. of
Annex 3 to this Regulation.
The value of n
and v
used in the determination of gear and vehicle speed selection
shall be the average of the four n
, j and v
, j values during each valid measurement
run.
The value of n shall be reported to a precision of 10 revolutions per minute. The
reported n shall be used in all subsequent calculation.
The value of v shall be reported to the first digit after the decimal (xx,x).The reported
v ' shall be used in all subsequent calculation.

(d)
If one gear choice fulfils the target condition for the rotational engine speed
n but not the target condition for the vehicle speed v , use two gears,
gear and gear . The target conditions for the vehicle speed for these two gears
are as follows:
gear
25km/h ≤ v ≤ 30km/h
and
gear
40km/h ≤ v ≤ 45km/h
Both gears, gear and gear shall fulfil the target rotational engine speed n .
Both gears shall be used for further calculation of L .
If only one of the gears fulfils the target rotational engine speed, n
that gear. This gear shall be used for further calculation of L .
, test with
(e)
If none of the two gears fulfils the target rotational engine speed n
under
condition d) then condition f) shall be chosen.
(f)
If no gear choice fulfils the target rotational engine speed choose the gear that
fulfils the target vehicle velocity v and is closest to the target rotational
engine speed n , but not higher than n .
v = v
n ≤ n
A stable acceleration condition shall be insured. If a stable acceleration cannot be
insured in a gear, this gear shall be disregarded. In all conditions, the rated engine
speed shall not be exceeded while the reference point of the vehicle is in the
measurement zone. If the rated engine speed is exceeded within the
measurement zone, this gear shall be disregarded.
3.1.2.2.1.2. Automatic transmission, adaptive transmissions, and transmissions with variable gear
ratio tested with non-locked gear ratios
The gear selector position for full automatic operation shall be used.
The test may then include a gear change to a lower range and a higher acceleration. A
gear change to a higher range and a lower acceleration is not allowed. In any case a
gear change to a gear ratio that is typically not used at the specified condition as defined
by the manufacturer in urban traffic shall be avoided.
Therefore, it is permitted to establish and use electronic or mechanical devices, including
alternative gear selector positions, to prevent a downshift to a gear ratio that is typically
not used at the specified test condition as defined by the manufacturer in urban traffic.

If the vehicle cannot fulfil the condition:
n ≤ n for i = 1, 2
condition (e) shall be used.
(e)
If the choice of the gear selector position cannot fulfil the target conditions for the
rotational engine speed n and the target condition for the vehicle speed
v , change the target condition for the vehicle speed to the following:
v = v + 5km/h
Conduct the test with that vehicle speed v where n is closest to the target
rotational engine speed n . A gear change to a higher range and a lower
acceleration is allowed after the vehicle passes line PP’.
(f)
If the vehicle includes a transmission design that provides only a single gear
selection (D) that limits engine speed during the test, the vehicle shall be tested
using only the target vehicle speed v .
3.1.2.2.1.3. Powertrain with no combustion engine rotational engine speed available
Vehicles with a powertrain where no combustion engine rotational engine speed is
available shall fulfil only the target condition for the vehicle speed
v
The following conditions for fulfilling the target condition v in Paragraph 3.1.2.2. of
Annex 3 to this Regulation are possible.
(a)
If no rotational engine speed is available, it is necessary to fulfil only the target
vehicle speed v .
(b) If no rotational engine speed is available and the target vehicle speed v
cannot be fulfilled, two test conditions shall be conducted as follows:
v for the first test condition is defined as
25km/h ≤ v ≤ 35km/h
and
v for the second test condition is defined as
35km/h ≤ v ≤ 45km/h
Both test conditions are used for further calculation of L .

3.1.3.1. Vehicles of Categories M , N and M ≤ 3,500kg technically permissible maximum laden
mass
The calculated values for the acceleration test and the constant speed test are given by:
L = L + k * (L – L )
L = L + k * (L – L )
Where k = (a – a )/(a – a )
In the case of a single gear ratio test the values are the test result of each test.
The final result is calculated by combining L and L . The equation is:
L = L – k * (L – L )
The weighting factor kP gives the part power factor for urban driving. In cases other than
a single gear test, kP is calculated by:
k = 1 – (a /a )
If only one gear was specified for the test, k is given by:
k = 1 – (a /a )
In cases where a is less than a :
k = 0
3.1.3.2. Vehicles of Categories M > 3,500kg technically permissible maximum laden mass, M ,
N , N
When the result of one test condition is used the final result L is equal to the
intermediate result.
When the results of two test conditions are used the arithmetic mean of the intermediate
results of the two averages for each side of the two conditions shall be calculated. The
final result L is the higher value of the two calculated averages.
3.2. Measurement of Sound Emitted by Stationary Vehicles
3.2.1. Sound level in the vicinity of vehicles The measurement results shall be entered into the
Addendum to the Communication form (Annex 1, Appendix 1).
3.2.2. Acoustic Measurements
A precision sound level meter as defined in Paragraph 1.1 of this Annex shall be used for
the measurements.

3.2.5.3.1.2. For vehicles having an exhaust provided with outlets spaced more than 0.3m apart, one
measurement is made for each outlet. The highest level shall be recorded.
3.2.5.3.1.3. In the case of an exhaust provided with two or more outlets spaced less than 0.3 m apart
and which are connected to the same silencer; the microphone position is related to the
outlet nearest to one extreme edge of the vehicle or, when such outlet does not exist, to
the outlet, which is highest above the ground.
3.2.5.3.1.4. For vehicles with a vertical exhaust (e.g. commercial vehicles) the microphone shall be
placed at the height of the exhaust outlet. Its axis shall be vertical and oriented upwards.
It shall be placed at a distance of 0.5m ± 0.01m from the exhaust pipe reference point,
but never less than 0.2m from the side of the vehicle nearest to the exhaust.
3.2.5.3.1.5. For exhaust outlets located under the vehicle body, the microphone shall be located a
minimum of 0.2m from the nearest part of the vehicle, at a point closest to, but never less
than 0.5m from the exhaust pipe reference point, and at a height of 0.2m above the
ground, and not in line with the exhaust flow. The angularity requirement in
Paragraph 3.2.5.3.1.2. may not be met in some cases.
3.2.5.3.1.6. Examples of the position of the microphone, depending on the location of the exhaust
pipe, are given in Figures 3a-3d in Appendix 1 to Annex 3.
3.2.5.3.2. Operating conditions of the engine
3.2.5.3.2.1. Target engine speed
The target engine speed is defined as:
(a)
(b)
(c)
75% of the rated engine speed S for vehicles with a rated engine speed
≤5,000min ;
3,750min for vehicles with a rated engine speed above 5,000min and below
7,500min ;
50% of the rated engine speed S for vehicles with a rated engine speed
≥7,500min .
3.2.5.3.2.2. Test Procedure
If the vehicle cannot reach the engine speed as stated above, the target engine
speed shall be 5% below the maximum possible engine speed for that stationary
test.
The engine speed shall be gradually increased from idle to the target engine speed, not
exceeding the tolerance band of ±3% of the target engine speed, and held constant.
Then the throttle control shall be rapidly released and the engine speed shall be returned
to idle. The sound pressure level shall be measured during a period of operation
consisting of a maintaining constant engine speed of 1s and throughout the entire
deceleration period. The maximum sound level meter reading during this period of
operation, mathematically rounded to the first decimal place, is taken as the test value.

ANNEX 3 - APPENDIX
Figure 1
Measuring Positions for Vehicles in Motion

Figure 3a
Figure 3b
Figure 3c
Figure 3d

Figure 3b
Flowchart for Vehicles Tested According to Paragraph 3.1.2.1. of Annex 3 to this Regulation -
Gear Selection Using Locked Gear PART 1

Figure 3d
Flowchart for Vehicles Tested According to Paragraph 3.1.2.1. of Annex 3 to this Regulation –
Gear selection Using Locked Gear PART 3

Figure 4a
Flowchart for Vehicles Tested According to Paragraph 3.1.2.2. of Annex 3 to this Regulation –
Test in Locked Gears

Figure 4c
Flowchart for Vehicles Tested According to Paragraph 3.1.2.2. of Annex 3 to this Regulation –
Test in non-locked gears PART 2

Note:
Broaden the window for the target vehicle speed v for vehicles of Category M > 3,500kg technically
permissible maximum laden mass and for vehicles of Category N , M and N .
The target vehicle velocity v is defined as v = 35km/h ± 5km/h which results in a window for the
velocity v , when the reference point passes line BB’, from 30km/h to 40km/h. If the target vehicle velocity
v is changed into two target vehicle velocities, a lower and a higher one, the following is meant: The
lower target vehicle velocity is defined as the target vehicle velocity v reduced by 5km/h
(v - 5km/h) which results in a window for the velocity v , when the reference point passes line BB’,
from 25km/h to 35 km/h.
25km/h ≤ v ≤ 35 km/h.
The higher target vehicle velocity is defined as the target vehicle velocity v increased by 5km/h (v
+ 5 km/h) which results in a window for the velocity v , when the reference point passes line BB’, from
35km/h to 45km/h.
35km/h ≤ v ≤ 45km/h.

1.2.3. During each 6h period, the engine shall be run, under the following conditions:
(a)
(b)
(c)
(d)
(e)
(f)
5min at idling speed;
1h sequence under 1/4 load at 3/4 of rated maximum speed (S);
1h sequence under 1/2 load at 3/4 of rated maximum speed (S);
10min sequence under full load at 3/4 of rated maximum speed (S);
15min sequence under 1/2 load at rated maximum speed (S);
30min sequence under 1/4 load at rated maximum speed (S).
Each period shall comprise two sequenced sets of the six above-mentioned conditions in
consecutive order from (a) to (f).
1.2.4. During the test, the silencing system or components thereof shall not be cooled by a forced
draught simulating normal airflow around the vehicle. Nevertheless, at the request of the
manufacturer, the silencing system or components thereof may be cooled in order not to
exceed the temperature recorded at its inlet when the vehicle is running at maximum speed.
1.3. Conditioning by Pulsation
1.3.1. The silencing system or components thereof shall be fitted to the vehicle referred to in
Paragraph 3.3. of this Regulation or the engine referred to in Paragraph 3.4. of this
Regulation. In the former case the vehicle shall be mounted on a roller dynamometer.
In the second case, the engine shall be mounted on a dynamometer. The test apparatus, a
detailed diagram of which is shown in Figure 1 of the appendix to this Annex shall be fitted
at the outlet of the silencing system. Any other apparatus providing equivalent results is
acceptable.
1.3.2. The test apparatus shall be adjusted in such a way that the exhaust-gas flow is alternatively
interrupted and re-established by the quick-action valve for 2,500 cycles.
1.3.3. The valve shall open when the exhaust-gas back pressure, measured at least 100mm
downstream of the intake flange, reaches a value of between 35 and 40kPa. It shall close
when this pressure does not differ by more than 10% from its stabilized value with the valve
open.
1.3.4. The time-delay switch shall be set for the duration of gas exhaust resulting from the
provisions laid down in Paragraph 1.3.3. above.
1.3.5. Engine speed shall be 75% of the rated engine speed (S) at which the engine develops
rated maximum net power.
1.3.6. The power indicated by the dynamometer shall be 50% of the full-throttle power measured
at 75% of rated engine speed (S).

ANNEX 4 – APPENDIX
Figure 1.
Test Apparatus for Conditioning by Pulsation
1. Inlet flange or sleeve for connection to the rear of the test exhaust system.
2. Hand-operated regulating valve.
3. Compensating reservoir with a maximum capacity of 40l and a filling time of not less than
one second.
4. Pressure switch with an operating range of 0.05 to 2.5bar.
5. Time delay switch.
6. Pulse counter.
7. Quick-acting valve, such as exhaust brake valve 60mm in diameter, operated by a
pneumatic cylinder with an output of 120N at 4bar. The response time, both when opening
and closing, shall not exceed 0.5s.
8. Exhaust gas evacuation.
9. Flexible pipe.
10. Pressure gauge.

ANNEX 5 – APPENDIX
Figure 1
Microphone Positions for Measurement of Compressed Air Noise
The measurement is performed at the stationary vehicle according to Figure 1, using two microphone
positions at a distance of 7m from the contour of the vehicles, and at 1.2m above ground.

ANNEX 7
MEASURING METHOD TO EVALUATE COMPLIANCE WITH THE ADDITIONAL
SOUND EMISSION PROVISIONS
Only applicable for vehicles as specified in Paragraph 6.2.3. of this Regulation
1. GENERAL
This Annex describes a measuring method to evaluate compliance of the vehicle with the
additional sound emission provisions (ASEP) conforming to Paragraph 6.2.3. of this
Regulation.
It is not mandatory to perform actual tests when applying for type-approval. The
manufacturer shall sign the declaration of compliance set out in Appendix 1. The approval
authority may ask for additional information about the declaration of compliance and carry
out the tests described below.
The procedure set out in this Annex requires the performance of a test in accordance with
Annex 3. The test specified in Annex 3 shall be carried out on the same test track under
conditions similar to those required in the tests prescribed in this Annex.
2. MEASURING METHOD
2.1. Measuring Instruments and Condition of Measurements
Unless otherwise specified, the measuring instruments, the conditions of the measurements
and the condition of the vehicle are equivalent to those specified in Annex 3,
Paragraphs 1. and 2.
If the vehicle has different modes that affect sound emission, all modes shall comply with
the requirements in this Annex. In the case where the manufacturer has performed tests to
prove to the approval authority compliance with the above requirements, the modes used
during those tests shall be reported in a test report.
2.2. Method of Testing
Unless otherwise specified, the conditions and procedures of Annex 3,
Paragraphs 3.1. to 3.1.2.1.2.2. shall be used. For the purpose of this annex, single test runs
are measured and evaluated.
2.3. Control Range
Operation conditions are as follows:
Vehicle speed V : v ≥ 20km/h
Vehicle acceleration a a ≤ 5.0m/s
Engine speed n n ≤ 2.0 * PMR * S or
n ≤ 0.9 * S, whichever is the lowest

2.6. Test of the Vehicle
The path of the centreline of the vehicle shall follow line CC' as closely as possible
throughout the entire test, starting from the approach to line AA' until the rear of the vehicle
passes line BB'.
At line AA' the accelerator shall be fully depressed. To achieve a more stable acceleration
or to avoid a down shift between line AA' and BB' pre-acceleration before line AA' may be
used. The accelerator shall be kept in depressed condition until the rear of the vehicle
reaches line BB'.
For every separate test run, the following parameters shall be determined and noted:
The maximum A-weighted sound pressure level of both sides of the vehicle, indicated
during each passage of the vehicle between the two lines AA' and BB', shall be
mathematically rounded to the first decimal place (L ). If a sound peak obviously out of
character with the general sound pressure level is observed, the measurement shall be
discarded. Left and right side may be measured simultaneously or separately.
The vehicle speed readings at AA' and BB' shall be reported with the first significant digit
after the decimal place. (v ; v )
If applicable, the engine speed readings at AA' and BB' shall be reported as a full integer
value (n ; n ).
The calculated acceleration shall be determined in accordance to the formula in
Paragraph 3.1.2.1.2. of Annex 3 and reported to the second digit after the decimal place
(a ).
3. ANALYSIS OF RESULTS
3.1. Determination of the Anchor Point for Each Gear Ratio
The anchor point consists of the maximum sound level L , the reported engine speed n
and vehicle speed v at BB' of gear ratio i of the acceleration test in Annex 3.
L = L ,
n = n
v = v
3.2 Slope of the Regression Line for Each Gear
The sound measurements shall be evaluated as function of engine speed according to
Paragraph 3.2.1.

4. INTERPRETATION OF RESULTS
Every individual sound measurement shall be evaluated.
The sound level of every specified measurement point shall not exceed the limits given
below:
L ≤ L
+ x
With:
x = 3dB(A) for vehicle with a non-lockable automatic transmission or non-lockable CVT
x = 2dB(A) + limit value - L of Annex 3 for all other vehicles
If the measured sound level at a point exceeds the limit, two additional measurements at the
same point shall be carried out to verify the measurement uncertainty. The vehicle is still in
compliance with ASEP, if the average of the three valid measurements at this specific point
fulfils the specification.
5. REFERENCE SOUND ASSESSMENT
The reference sound is assessed at a single point in one discrete gear, simulating an
acceleration condition starting with an entry speed at v equal to 50km/h and assuming an
exit speed at v equal to 61km/h. The sound compliance at this point can either be
calculated using the results of Paragraph 3.2.2. and the specification below or be evaluated
by direct measurement using the gear as specified below.
5.1. The Determination of Gear κ is as follows:
κ = 3 for all manual transmission and for automatic transmission with up to 5 gears;
κ = 4 for automatic transmission with 6 or more gears.
If no discrete gears are available, e.g. for non-lockable automatic transmissions or nonlockable
CVTs, the gear ratio for further calculation shall be determined from the
acceleration test result in Annex 3 using the reported engine speed and vehicle speed at
line BB'.
5.2. Determination of Reference Engine Speed n
The reference engine speed, n
reference speed of v = 61km/h.
, shall be calculated using the gear ratio of gear κ at the
5.3. Calculation of L
L = L + Slope * (n - n ) / 1,000
L shall be less than or equal to 76dB(A).
For vehicles fitted with a manual gear box having more than four forward gears and
equipped with an engine developing a rated maximum net power greater than 140kW
(according to Regulation No. 85) and having a maximum-power/maximum-mass ratio
greater than 75, L shall be less than or equal to 79dB(A).

ANNEX 7 – APPENDIX
STATEMENT OF COMPLIANCE WITH THE ADDITIONAL
SOUND EMISSION PROVISIONS
(Maximum format: A4 (210 × 297mm))
...................... (Name of manufacturer) attests that vehicles of this type ..................... (type with regard to
its sound emission pursuant to Regulation No. 51) comply with the requirements of Paragraph 6.2.3. of
Regulation No. 51.
...................... (Name of manufacturer) makes this statement in good faith, after having performed an
appropriate evaluation of the sound emission performance of the vehicles.
Date: ...............................................................................................................................................................
Name of authorized representative: ...............................................................................................................
Signature of authorized representative: .........................................................................................................
Noise - Sound Emissions.