Regulation No. 80-02

Name:Regulation No. 80-02
Description:Strength of Seats and their Anchorages - Buses.
Official Title:Uniform Provisions Concerning the Approval of: Seats of Large Passenger Vehicles and of these Vehicles with Regard to the Strength of the Seats and their Anchorages.
Country:ECE - United Nations
Date of Issue:2011-10-25
Amendment Level:02 Series
Number of Pages:39
Vehicle Types:Bus, Component
Subject Categories:Prior Versions
Available on InterRegs.NET

Our online subscription service, offering immediate access to our extensive library of global vehicle regulations, standards and legislation. A fully searchable, accurate, user-friendly resource for consolidated regulations that are updated quickly and frequently.

Tell me more | Already a subscriber

Available on SelectRegs.com

Our fast and easy means of purchasing up-to-date global vehicle and component standards and regulations on a pay-as-you-go basis. Pay securely by credit card and your documents are delivered directly and immediately to your computer as PDF files.

Tell me more | Go straight to site

Keywords:

seat, approval, vehicle, regulation, type, test, seats, position, paragraph, machine, point, appendix, requirements, torso, annex, angle, means, manufacturer, seating, back, anchorages, reference, amendments, series, vehicles, force, approved, plane, part, vertical, date, manikin, rear, measured, granted, procedure, tested, actual, number, horizontal, system, positions, entry, passenger, design, form, tests, pan, regard, apply

Text Extract:

All InterRegs documents are formatted as PDF files and contain the full text, tables, diagrams and illustrations of the original as issued by the national government authority. We do not re-word, summarise, cut or interpret the regulatory documents. They are consolidated, published in English, and updated on a regular basis. The following text extract indicates the scope of the document, but does not represent the actual PDF content.

E/ECE/324
) Rev.1/Add.79/Rev.1
E/ECE/TRANS/505 )
October 25, 2011
STATUS OF UNITED NATIONS REGULATION
ECE 80-02
UNIFORM PROVISIONS CONCERNING THE APPROVAL OF:
SEATS OF LARGE PASSENGER VEHICLES AND OF THESE VEHICLES WITH REGARD
TO THE STRENGTH OF THE SEATS AND THEIR ANCHORAGES
Incorporating:
00 series of amendments
Date of Entry into Force: 23.02.89
01 series of amendments
Date of Entry into Force: 08.02.98
Supplement 1 to the 01 series of amendments
Date of Entry into Force: 06.02.99
Supplement 2 to the 01 series of amendments
Date of Entry into Force: 29.12.00
Supplement 3 to the 01 series of amendments
Date of Entry into Force: 18.12.07
Corr. 2 of 15.01.09 to the 01 series of amendments
Date of Entry into Force: 12.11.08
02 series of amendments
Date of Entry into Force: 30.01.11

REGULATION NO. 80-02
UNIFORM PROVISIONS CONCERNING THE APPROVAL OF SEATS OF LARGE PASSENGER
VEHICLES AND OF THESE VEHICLES WITH REGARD TO THE STRENGTH OF THE SEATS AND
THEIR ANCHORAGES
Regulation
1. Scope
2. Definitions
3. Application for approval
4. Approval
5. Requirements for seats
CONTENTS
6. Requirements for seat anchorages of a vehicle type
7. Requirements for installation of seats in a vehicle type
8. Conformity of production
9. Penalties for non-conformity of production
10. Modifications and extension of approval of the seat type and/or the vehicle type
11. Production definitely discontinued
12. Transitional provisions
13. Names and addresses of technical services responsible for conducting approval tests and of Type
Approval Authorities.

REGULATION NO. 80-02
UNIFORM PROVISIONS CONCERNING THE APPROVAL OF SEATS OF LARGE PASSENGER
VEHICLES AND OF THESE VEHICLES WITH REGARD TO THE STRENGTH OF THE SEATS AND
THEIR ANCHORAGES
1. SCOPE
1.1. This Regulation applies to:
(a)
Passenger seats for forward-facing installation in vehicles of Categories M and M , of
Classes II, III and B1;
(b)
Vehicles of Categories M and M of Classes II, III and B
in respect of their
passenger seat anchorages and seat installation.
(c)
It does not apply to rearward-facing seats or to any head restraint fitted to these
seats.
1.2. At the request of the manufacturer, vehicles of Category M approved to
Regulation No. 17 shall be deemed to meet the requirements of this Regulation.
1.3. Vehicles where some seats benefit from the derogation provided in Paragraph 7.4. to
Regulation No. 14 shall be approved to this Regulation.
1.4. The installation of side-facing seats shall be prohibited in vehicles of Categories M (of
Class III or B) and M (of Class III or B).
1.5. At the request of the manufacturer and in agreement with the technical service, as well as
the Type Approval Authority of the Contracting Party, an approval may be granted for
vehicles of Category M (of Class III or B) of a technically permissible maximum laden mass
exceeding 10 t with side-facing seats on condition that these side-facing seats are grouped
together at the rear of the vehicle to form an integrated saloon of up to 10 seats. Such
side-facing seats shall be fitted with, at least, a head restraint and a two-point belt with
retractor type-approved in accordance with Regulation No. 16. Further, the anchorages for
their safety belts shall comply with dimensional and strength requirements based on those
as laid down in Regulation No. 14. However it shall be taken into account that the seat is
side-facing instead of forward-facing, and test and inspections shall not be waived on that
basis. The communication document (Annex 2) shall bear the remark stating that
side-facing seats have been permitted according to this Paragraph. Such approvals shall
not be granted anymore as from November 1, 2014 or as from the date of adoption of
uniform test provisions for side-facing seats (i.e. this Regulation) as well as provisions for
such seats regarding safety-belt anchorages (i.e. Regulation No. 14) and vehicles equipped
with safety-belts (i.e. Regulation No. 16), whichever date is earlier.
1.6. Paragraph 1.4. shall not apply to ambulances or to vehicles intended for use by the armed
services, civil defence, fire services and forces responsible for maintaining public order.

2.8. "Row of seats" means a seat designed and constructed for the accommodation of three or
more seated passengers side by side; several individual or double seats arranged side by
side shall not be regarded as a row of seats;
2.9. "Seat cushion" means the part of the seat which is arranged almost horizontally and
designed to support a seated passenger;
2.10. "Seat-back" means the part of the seat that is almost vertical, designed to support the
passenger's back, shoulders and, possibly, his head;
2.11. "Adjustment system" means the device by which the seat or its parts can be adjusted to a
position suited to the seated occupant;
2.12. "Displacement system" means a device enabling the seat or one of its parts to be
displaced laterally or longitudinally without a fixed intermediate position of the seat or one of
its parts, to facilitate access by passengers;
2.13. "Locking system" means a device ensuring that the seat and its parts are maintained in
the position of use;
2.14. "Anchorage" means a part of the floor or of the body of a vehicle to which a seat may be
fixed;
2.15. "Attachment fittings" means bolts or other components used to attach the seat to the
vehicle;
2.16. "Trolley" means the test equipment made and used for dynamic reproduction of road
accidents involving frontal collision;
2.17. "Auxiliary seat" means a seat for the manikin mounted on the trolley to the rear of the seat
to be tested. This seat shall be representative of the seat to be used in the vehicle behind
the seat to be tested;
2.18. "Reference plane" means the plane passing through the points of contact of the heels of
the manikin, used for the determination of the H Point and the actual angle of torso for the
seating position of motor vehicles according to the prescriptions of Annex 4;
2.19. "Reference height" means the height of the top of the seat above the reference plane;
2.20. "Manikin", a manikin corresponding to the specifications for HYBRID II or III ;
2.21. "Reference zone", means the space between two vertical longitudinal planes, 400 mm
apart and symmetrical with respect to the H-Point, and defined by rotation from vertical to
horizontal of the headform apparatus, described in Regulation No. 21, Annex 1. The
apparatus shall be positioned as described in that annex to Regulation No. 21 and set to its
maximum length of 840 mm and its minimum length of 736 mm for residual limitation of said
space;

4.4. Notice of approval or of extension or refusal of approval of a seat type and/or a vehicle type
pursuant to this Regulation shall be communicated to the Parties to the 1958 Agreement
applying this Regulation, by means of a form conforming to the model in Annex 1 and/or
Annex 2 to this Regulation.
4.5. There shall be affixed, conspicuously and in a readily accessible place specified on the
approval form, to every seat conforming to a seat type approved under this Regulation and
to every vehicle conforming to a vehicle type approved under this Regulation an
international approval mark consisting of:
4.5.1. A circle surrounding the Letter "E" followed by the distinguishing number of the country
which has granted approval ;
4.5.2. The number of this Regulation, followed by the Letter R, a dash and the approval number,
placed to the right of the circle prescribed in Paragraph 4.5.1.
4.6. The approval mark shall be clearly legible and shall be indelible.
4.7. As the case may be, the approval mark shall be placed on the seat or seats or on, or close
to, the data plate affixed to the vehicle by the manufacturer.
4.8. Examples of arrangements of approval marks are given in Annex 3.
5. REQUIREMENTS FOR SEATS
5.1. Each type of seat shall be subject to the test requirements of either Appendix 1 (dynamic
test) or Appendices 5 and 6 (static test) at the request of the manufacturer.
5.2. The tests which the seat type has passed shall be recorded in the communication form
concerning the approval of a seat type and conforming to the model in Annex 1.
5.3. Every adjustment and displacement system provided shall incorporate a locking system,
which shall operate automatically.
5.4. The adjustment and locking systems shall not be required to be in full working order after
the test.
5.5. A head restraint shall be mounted on every outboard front seat in every vehicle of
Category M with a maximum mass not exceeding 3 500 kg. This head restraint shall
comply with the requirements of Regulation No. 25, as amended by the 03 series of
amendments.

7.3. When approved to Appendices 5 and 6, all tests shall apply, except as follows:
7.3.1. The test of Appendix 5 shall not apply if the rear of the seat cannot be struck by an
unrestrained passenger (i.e. there is no forward-facing seat directly behind the seat to be
tested).
7.3.2. The test of Appendix 6 shall not apply:
7.3.2.1. If the rear of the seat cannot be struck by a restrained passenger; or
7.3.2.2. If the seat behind is fitted with a 3-point belt with anchorages that comply fully with
Regulation No. 14 (without derogation).
8. CONFORMITY OF PRODUCTION
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. Seats and or vehicles approved to this Regulation shall be so set out in Paragraphs 5., 6.
and 7. above.
8.2. In order to verify that the requirements of Paragraph 8.1. are met, suitable controls of the
production shall be carried out. In this case, suitable controls mean checking the
dimensions of the product as well as the existence of procedures for the effective control of
the quality of products.
8.3. The competent authority which has granted type approval may at any time verify the
conformity control methods applicable to each production unit and carry out on samples any
test deemed necessary among the tests carried out for the approval. The normal frequency
of these verifications shall be once a year.
9. PENALTIES FOR NON-CONFORMITY OF PRODUCTION
9.1. The approval granted in respect of a seat type and/or 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 and/or
Annex 2 to this Regulation.
10. MODIFICATION AND EXTENSION OF APPROVAL OF THE SEAT TYPE AND/OR THE
VEHICLE TYPE
10.1. Every modification of the seat type and/or the vehicle type shall be notified to the Type
Approval Authority which approved the seat type and/or the vehicle type. The department
may then either:
10.1.1. Consider that the modifications made are unlikely to have an appreciable adverse effect and
that in any case the seat and/or the vehicle still complies with the requirements; or
10.1.2. Require a further test report from the technical service responsible for conducting the tests.

APPENDIX 1
TEST PROCEDURES FOR SEATS ACCORDING TO PARAGRAPH 5 AND/OR ANCHORAGES
ACCORDING TO PARAGRAPH 6.1.2.
1. REQUIREMENTS
1.1. The tests are to determine:
1.1.1. If the seat occupant(s) is (are) correctly retained by the seat(s) in front of him (them) and/or
by the use of a safety belt.
1.1.1.1. This requirement shall be considered satisfied if the forward movement of any part of the
trunk and the head of the manikin does not pass beyond the transversal vertical plane
situated at 1.6 m from the R Point of the auxiliary seat;
1.1.2. If the seat occupant(s) is (are) not seriously injured.
1.1.2.1. This requirement shall be considered satisfied if the following biomechanical acceptability
criteria for the instrumented manikin, determined in accordance with Appendix 4, are met;
that is:
1.1.2.1.1. The head acceptability criterion HIC is less than 500;
1.1.2.1.2. The thorax acceptability criterion (ThAC) is less than 30 g except for periods totalling less
than 3 ms (g = 9.81 m/s );
1.1.2.1.3. The femur acceptability criterion (FAC) is less than 10 kN and the value of 8 kN is not
exceeded for periods totalling more than 20 ms;
1.1.3. If the seat and the seat mountings are strong enough.
1.1.3.1. This requirement shall be considered satisfied if:
1.1.3.1.1. No part of the seat, the seat mountings or the accessories becomes completely detached
during the test;
1.1.3.1.2. The seat remains firmly held, even if one or more anchorages are partly detached, and all
the locking systems remain locked during the whole duration of the test;
1.1.3.1.3. After the test no structural part of the seat or accessories has any fracture or sharp or
pointed edges or corners likely to cause any bodily injury.

3. DYNAMIC TESTS
3.1. Test 1
The testing platform shall be mounted on a trolley.
3.2. Auxiliary Seat
The auxiliary seat may be of the same type as the seat being tested and shall be located
parallel to and directly behind the seat being tested. The two seats shall be at the same
height, adjusted identically and on a seat spacing of 750 mm.
3.2.1. If an auxiliary seat of a different type is used this shall be mentioned in the communication
form concerning the approval of a seat type and conformity to the model in Annex 1 to this
Regulation.
3.3. Manikin
3.3.1. The manikin shall be placed unrestrained on the auxiliary seat so that its plane of symmetry
corresponds to the plane of symmetry of the seating position in question.
3.3.2. The manikin's hands shall rest on its thighs with the elbows touching the seat back; the legs
shall be extended to the maximum and shall, if possible, be parallel; the heels shall touch
the floor.
3.3.3. Each manikin required shall be installed on a seat in accordance with the following
procedure:
3.3.3.1. The manikin shall be placed on the seat as close as possible to the desired position,
3.3.3.2. A flat rigid surface 76 mm × 76 mm in area shall be placed as low as possible against the
front of the manikin's torso,
3.3.3.3. The flat surface shall be pressed horizontally against the manikin's torso at a load of
between 25 and 35 daN:
3.3.3.3.1. The torso shall be drawn forward by the shoulders to the vertical position, then laid back
against the seat back. This operation shall be performed twice;
3.3.3.3.2. Without the torso moving, the head shall be placed in a position such that the platform
supporting the measuring instruments contained in the head is horizontal and that the
median sagittal plane of the head is parallel to that of the vehicle.
3.3.3.4. The flat surface be carefully removed,
3.3.3.5. The manikin shall be moved forward on the seat and the installation procedure described
above repeated,
3.3.3.6. If necessary, the position of the lower members shall be corrected,
3.3.3.7. The measuring instruments installed shall not in any way affect the movement of the
manikin during impact,
3.3.3.8. The temperature of the system of measuring instruments shall be stabilized before the test
and maintained so far as possible within a range between 19° C and 26° C.

APPENDIX 2
TEST PROCEDURE FOR THE ANCHORAGES OF A
VEHICLE IN APPLICATION OF PARAGRAPH 6.1.1.
1. TEST APPARATUS
1.1. A rigid structure sufficiently representative of the seat intended for use on the vehicle is fixed
by the means of fixation (bolts, screws, etc.) provided by the manufacturer to the parts of the
structure submitted to the tests.
1.2. If several seat types differing from one another in respect of the distance between the front
and back ends of their feet can be mounted on the same anchorage, the test shall be carried
out with the shortest footing. This footing shall be described on the type approval certificate.
2. TEST PROCEDURE
2.1. A force F shall be applied.
2.1.1. At a height of 750 mm above the reference plane and on the vertical line containing the
geometrical centre of the surface bounded by the polygon having the different anchorage
points as apexes or, if applicable, the extreme anchorages of the seat, by the rigid structure
as defined in Paragraph 1.1. above;
2.1.2. In the horizontal direction and directed to the front of the vehicle;
2.1.3. In a delay as short as possible and for a duration of at least 0.2 s.
2.2. The force F shall be determined either
2.2.1. By the following formula: F = (5,000 ± 50) × i where:
F is given in N and i represents the number of seating positions of the seat for which the
anchorages to be tested are to be approved; or, if requested by the manufacturer,
2.2.2. In accordance with the representative loads measured during dynamic tests as described in
Appendix 1 to this Regulation.

APPENDIX 4
DETERMINATION OF ACCEPTABILITY CRITERIA
1.1. This injury criterion (HIC) is calculated on the basis of the resultant triaxial acceleration
measured according to Appendix 3, Paragraph 2.2.1. by the following expression:

1
HIC =
⎢ t − t ∫

( t − t ) ⎢ γ dt
in which t and t are any values of time during the test, HIC being maximum value for and
interval t , t . The values of t and t are expressed in seconds.
2. THORAX ACCEPTABILITY CRITERION (ThAC)
2.1. This criterion is determined by the absolute value of resultant acceleration, expressed in g
and measured according to Appendix 3, Paragraph 2.2.2, and by the acceleration period,
expressed in ms.
3. FEMUR ACCEPTABILITY CRITERION (FAC)
This criterion is determined by the compression load expressed in kN, transmitted axially on
each femur of the manikin and measured according to Appendix 3, Paragraph 2.2.3., and by
the duration of the compression load, expressed in ms.





2. STATIC TESTS
2.1. Test Apparatus
2.1.1. This consists of cylindrical surfaces with a radius of curvature equal to 82 ± 3 mm and a
width:
2.1.1.1. At least equal to the width of the seat-back of each seating position of the seat to be tested
for the upper form,
2.1.1.2. Equal to 320 -0/+10 mm for the lower form as shown in Figure 1 of this Appendix.
2.1.2. The surface resting against the parts of the seat shall be made of a material the hardness of
which is not less than 80 Shore A.
2.1.3. Each cylindrical surface shall be equipped with at least one force transducer able to
measure the forces applied in the direction defined in Paragraph 2.2.1.1.
2.2.
Test Procedure
2.2.1.
1 000
A test force to
H
± 50 N shall be applied using a device,
conforming to Paragraph 2.1. above, to the rear part of the seat corresponding to each
seating position of the seat.
2.2.1.1. The direction of application of the force shall be situated in the vertical median plane of the
seating position concerned; it shall be horizontal and from the rear towards the front of the
seat.
2.2.1.2. This direction shall be situated at the height H which shall be between 0.70 m and 0.80 m
and above the reference plane. The exact height shall be determined by the manufacturer.
2 000
2.2.2. A test force equal to ± 100 N shall be applied
H
simultaneously to the rear part of the seat corresponding to each seating position of the seat
in the same vertical plane and in the same direction at the height H which shall be between
0.45 and 0.55 m above the reference plane, with a device conforming to Paragraph 2.1.
above. The exact height shall be determined by the manufacturer.
2.2.3. The test form shall be maintained as far as possible in contact with the rear of the seat
during the application of the forces specified in Paragraphs 2.2.1. and 2.2.2. above. They
shall be able to pivot in a horizontal plane.
2.2.4. Where a seat consists of more than one seating position, the forces corresponding to each
seating position shall be applied simultaneously and there shall be as many upper and lower
forms as seating positions.
2.2.5. The initial position of each seating position of each of the forms shall be determined by
bringing the test devices into contact with the seat with a force equal to at least 20 N.
2.2.6. The forces indicated in Paragraphs 2.2.1. and 2.2.2. above shall be applied as rapidly as
possible and shall be maintained together at the specified value, whatever the deformation,
for at least 0.2 seconds.

APPENDIX 6
ENERGY ABSORPTION CHARACTERISTICS OF THE REAR PART OF SEAT BACKS
1. Elements of the rear part of seat backs situated in the reference zone, as defined in
Paragraph 2.21. of this Regulation, shall be verified at the request of the manufacturer
according to the energy absorbing requirements set out in Annex 4, to Regulation No. 21. For
this purpose, all accessories fitted shall be tested in all positions of use, except tables which
shall be considered in the stowed position.
2. This test shall be referred to in the communication form concerning the approval of a seat type
conforming to the model in Annex 1 to this Regulation. A drawing showing the area of the part
of the seat back, verified by the energy dissipation test, shall be enclosed.

5.6. Seat approved in accordance with Paragraph 5.1. of this Regulation (dynamic test): yes/no : .......
5.6.1. Test 1 according to Appendix 1: yes/no : .........................................................................................
5.6.2. Test 2 according to Appendix 1: yes/no : .........................................................................................
5.6.3. Description of the safety-belts and anchorages used for the purpose of Test 2: ................................
5.6.4. Type of auxiliary seat used for Test 2 (if different from the type of seat approved): ...........................
5.7. Seat approved in accordance with Paragraph 5.1. of this Regulation (static test): yes/no : ............
5.8. Test according to Appendix 5: yes/no : ............................................................................................
5.9. Test according to Appendix 6: yes/no : ............................................................................................
6. Seat submitted for approval on: ..........................................................................................................
7. Type of device: deceleration/acceleration
8. Technical service, responsible for the approval test: ..........................................................................
9. Date of report issued by that service: ..................................................................................................
10. Number of report issued by that service: ............................................................................................
11. Approval granted/refused/extended/withdrawn: .............................................................................
12. Position of approval mark on the seat: ................................................................................................
13. Place: ...................................................................................................................................................
14. Date: ....................................................................................................................................................
15. Signature: ............................................................................................................................................
16. The following documents, bearing the approval number shown above, are available on request:
.............................................................................................................................................................

6. Vehicle submitted for approval on: ........................................................................................................
7. Technical service, responsible for the approval test: ............................................................................
8. Date of report issued by that service: ....................................................................................................
9. Number of report issued by that service: ..............................................................................................
10. Approval granted/refused/extended/withdrawn: ................................................................................
11. Location of approval mark on the vehicle: .............................................................................................
12. Place: .....................................................................................................................................................
13. Date: ......................................................................................................................................................
14. Signature: ..............................................................................................................................................
15. The following documents, bearing the approval number shown above, are available on request:
...............................................................................................................................................................

ANNEX 4
PROCEDURE FOR DETERMINING THE "H" POINT AND THE ACTUAL TORSO ANGLE FOR
SEATING POSITION IN MOTOR VEHICLES
1. PURPOSE
The procedure described in this annex is used to establish the "H" Point location and the
actual torso angle for one or several seating positions in a motor vehicle and to verify the
relationship of measured data to design specifications given by the vehicle manufacturer .
2. DEFINITIONS
For the purposes of this Annex:
2.1. "Reference data" means one or several of the following characteristics of a seating position:
2.1.1. The "H Point" and the "R" Point and their relationship;
2.1.2. The actual torso angle and the design torso angle and their relationship;
2.2. "Three-dimensional 'H' Point machine" (3 DH machine) means the device used for the
determination of "H" Points and actual torso angles. This device is described in Appendix 1 to
this Annex;
2.3. "'H' Point" means the pivot centre of the torso and thigh of the 3 DH machine installed in the
vehicle seat in accordance with Paragraph 4. below. The "H" Point is located in the centre of
the centreline of the device which is between the "H" Point sight buttons on either side of the
3 DH machine. The "H" Point corresponds theoretically to the "R" Point (for tolerances see
Paragraph 3.2.2. below). Once determined in accordance with the procedure described in
Paragraph 4., the "H" Point is considered fixed in relation to the seat-cushion structure and to
move with it when the seat is adjusted;
2.4. "'R' Point" or "seating reference point" means a design point defined by the vehicle
manufacturer for each seating position and established with respect to the three-dimensional
reference system;
2.5. "Torso-line" means the centreline of the probe of the 3 DH machine with the probe in the
fully rearward position;
2.6. "Actual torso angle" means the angle measured between a vertical line through the
"H" Point and the torso line using the back angle quadrant on the 3 DH machine. The actual
torso angle corresponds theoretically to the design torso angle (for tolerances see
Paragraph 3.2.2. below);
2.7. "Design torso angle" means the angle measures between a vertical line through the
"R" Point and the torso line in a position which corresponds to the design position of the
seat-back established by the vehicle manufacturer;

3.2.5. If the results of at least two of the three operations described in Paragraph 3.2.4. above do
not satisfy the requirements of Paragraph 3.2.2. above, or if the verification cannot take place
because the vehicle manufacturer has failed to supply information regarding the position of
the "R" Point or regarding the design torso angle, the centroid of the three measured points or
the average of the three measured angles shall be used and be regarded as applicable in all
cases where the "R" Point or the design torso angle is referred to in this Regulation.
4. PROCEDURE FOR "H" POINT AND ACTUAL TORSO ANGLE DETERMINATION
4.1. The vehicle shall be pre-conditioned at the manufacturer's discretion, at a temperature of
20 ± 10° C to ensure that the seat material reaches room temperature. If the seat to be
checked has never been sat upon, a 70 to 80 kg person or device shall sit on the seat twice
for one minute to flex the cushion and back. At the manufacturer's request, all seat
assemblies shall remain unloaded for a minimum period of 30 min. prior to installation of the
3 DH machine;
4.2. The vehicle shall be at the measuring attitude defined in Paragraph 2.11. above;
4.3. The seat, if it is adjustable, shall be adjusted first to the rearmost normal driving or riding
position, as indicated by the vehicle manufacturer, taking into consideration only the
longitudinal adjustment of the seat, excluding seat travel used for purposes other than normal
driving or riding positions. Where other modes of seat adjustment exist (vertical, angular,
seat-back, etc.) these will be then adjusted to the position specified by the vehicle
manufacturer. For suspension seats, the vertical position shall be rigidly fixed corresponding
to a normal driving position as specified by the manufacturer;
4.4. The area of the seating position contacted by the 3 DH machine shall be covered by a muslin
cotton, of sufficient size and appropriate texture, described as a plain cotton fabric having
18.9 threads per/cm and weighing 0.228 kg/m or knitted or non-woven fabric having
equivalent characteristics. If test is run on a seat outside the vehicle, the floor on which the
seat is placed shall have the same essential characteristics as the floor of the vehicle in
which the seat is intended to be used;
4.5. Place the seat and back assembly of the 3 DH machine so that the centreplane of the
occupant (C/LO) coincides with the centreplane of the 3 DH machine. At the manufacturer's
request, the 3 DH machine may be moved inboard with respect to the C/LO if the 3 DH
machine is located so far outboard that the seat edge will not permit levelling of the 3 DH
machine;
4.6. Attach the foot and lower leg assemblies to the seat pan assembly, either individually or by
using the T-bar and lower leg assembly. A line through the "H" Point sight buttons shall be
parallel to the ground and perpendicular to the longitudinal centreplane of the seat;

4.11. Install the right and left buttock weights and then, alternately, the eight torso weights. Maintain
the 3 DH machine level;
4.12. Tilt the back pan forward to release the tension on the seat-back. Rock the 3 DH machine
from side to side through 10° arc (5° to each side of the vertical centreplane) for three
complete cycles to release any accumulated friction between the 3 DH machine and the seat;
During the rocking action, the T-bar of the 3 DH machine may tend to diverge from the
specified horizontal and vertical alignment. The T-bar must therefore be restrained by
applying an appropriate lateral load during the rocking motions. Care shall be exercised in
holding the T-bar and rocking the 3 DH machine to ensure that no inadvertent exterior loads
are applied in a vertical or fore and aft direction;
The feet of the 3 DH machine are not to be restrained or held during this step. If the feet
change position, they should be allowed to remain in that attitude for the moment.
Carefully return the back pan to the seat-back and check the two spirit levels for zero position.
If any movement of the feet has occurred during the rocking operation of the 3 DH machine,
they must be repositioned as follows:
Alternately, lift each foot off the floor the minimum necessary amount until no additional foot
movement is obtained. During this lifting, the feet are to be free to rotate; and no forward or
lateral loads are to be applied. When each foot is placed back in the down position, the heel
is to be in contact with the structure designed for this;
Check the lateral spirit level for zero position; if necessary, apply a lateral load to the top of
the back pan sufficient to level the 3 DH machine's seat pan on the seat;
4.13. Holding the T-bar to prevent the 3 DH machine from sliding forward on the seat cushion,
proceed as follows:
(a) Return the back pan to the seat-back;
(b) Alternately apply and release a horizontal rearward load, not to exceed 25 N, to the back
angle bar at a height approximately at the centre of the torso weights until the hip angle
quadrant indicates that a stable position has been reached after load release. Care shall
be exercised to ensure that no exterior downward or lateral loads are applied to the
3 DH machine. If another level adjustment of the 3 DH machine is necessary, rotate the
back pan forward, re-level, and repeat the procedure from Paragraph 4.12;
4.14. Take all measurements:
4.14.1. The co-ordinates of the "H" Point are measured with respect to the three-dimensional
reference system;
4.14.2. The actual torso angle is read at the back angle quadrant of the 3 DH machine with the probe
in its fully rearward position;
4.15. If a re-run of the installation of the 3 DH machine is desired, the seat assembly should remain
unloaded for a minimum period of 30 minutes prior to the re-run. The 3 DH machine should
not be left loaded on the seat assembly longer than the time required to perform the test;

ANNEX 4 – APPENDIX 1
DESCRIPTION OF THE THREE DIMENSIONAL "H" POINT MACHINE
(3 DH MACHINE)
1. BACK AND SEAT PANS
The back and seat pans are constructed of reinforced plastic and metal; they simulate the
human torso and thigh and are mechanically hinged at the "H" Point. A quadrant is fastened to
the probe hinged at the "H" Point to measure the actual torso angle. An adjustable thigh bar,
attached to the seat pan, establishes the thigh centreline and serves as a baseline for the hip
angle quadrant.
2. BODY AND LEG ELEMENTS
Lower leg segments are connected to the seat pan assembly at the T-bar joining the knees,
which is a lateral extension of the adjustable thigh bar. Quadrants are incorporated in the lower
leg segments to measure knee angles. Shoe and foot assemblies are calibrated to measure the
foot angle. Two spirit levels orient the device in space. Body element weights are placed at the
corresponding centres of gravity to provide seat penetration equivalent to a 76 kg male. All joints
of the 3 DH machine should be checked for free movement without encountering noticeable
friction.

ANNEX 4 – APPENDIX 1
Figure 2
Dimensions of the 3 DH Machine Elements and Load Distribution

ANNEX 4 – APPENDIX 3
REFERENCE DATA CONCERNING SEATING POSITIONS
1. CODING OF REFERENCE DATA
Reference data are listed consecutively for each seating position. Seating positions are
identified by a two-digit code. The first digit is an Arabic numeral and designates the row of
seats, counting from the front to the rear of the vehicle. The second digit is a capital letter which
designates the location of the seating position in a row, as viewed in the direction of forward
motion of the vehicle; the following letters shall be used:
L = left
C = centre
R = right
2. DESCRIPTION OF VEHICLE MEASURING ATTITUDE
2.1. Co-ordinates of Fiducial Marks
X ..........................................
Y ..........................................
Z ..........................................
3. LIST OF REFERENCE DATA
3.1 Seating Position: ...........................
3.1.1 Co-ordinates of "R" Point
X ..........................................
Y ..........................................
Z ..........................................
3.1.2. Design Torso Angle: .......................
3.1.3. Specifications for Seat Adjustment
Horizontal: ...........................
Vertical: ...............................
Angular: ...............................
Torso angle: ........................
Note: List reference data for further seating positions under 3.2, 3.3, etc.
Strength of Seats and their Anchorages - Buses.