Commission Directive 96/37/EC of 17 June 1996 adapting to technical progress Council Directive 74/408/EEC relating to the interior fittings of motor vehicles (strength of seats and of their anchorages) (Text with EEA relevance)
COMMISSION DIRECTIVE 96/37/EC
of 17 June 1996
adapting to technical progress Council Directive 74/408/EEC relating to the interior fittings of motor vehicles (strength of seats and of their anchorages)
(Text with EEA relevance)
THE COMMISSION OF THE EUROPEAN COMMUNITIES,
Having regard to the Treaty establishing the European Community,
Having regard to Council Directive 70/156/EEC of 6 February 1970 on the approximation of the laws of the Member States relating to the type-approval of motor vehicles and their trailers ( 1 ), as last amended by Commission Directive 95/54/EC ( 2 ), and in particular Article 13 (2) thereof,
Having regard to Council Directive 74/408/EEC of 22 July 1974 on the approximation of the laws of the Member States relating to the interior fittings of motor vehicles (strength of seats and of their anchorages) ( 3 ), as last amended by Commission Directive 81/577/EEC ( 4 ), and in particular Article 5 thereof,
Whereas Directive 74/408/EEC is one of the separate Directives of the EEC type-approval procedure which has been established by Directive 70/156/EEC; whereas, consequently, the provisions laid down in Directive 70/156/EEC relating to vehicle systems, components and separate technical units apply to this Directive;
Whereas, in particular, Articles 3 (4) and 4 (3) of Directive 70/156/EEC necessitate that each separate Directive has attached to it an information document incorporating the relevant items of Annex I to that Directive and also a type-approval certificate based on Annex VI thereto in order that type-approval may be computerised;
Whereas it is possible further to adapt this Directive in the light of technical progress so as to improve the protection provided for passengers in motor vehicles in respect of the strength of the seats and the fitting of head restraints, by requiring compliance with the technical provisions of United Nations Economic Commission for Europe Regulation 17.04 and, in particular, the height of head restraints envisaged for the 05 series of amendments to that Regulation;
Whereas it is also possible to require head restraints to be fitted to the outboard front seats in vehicles in categories M1, N1 and M2 with a gross weight not exceeding 3 500 kg so as to minimize the risk of neck injuries in rear-end collisions;
Whereas the procedure for determining the H-point of a seat is given in Annex III to Council Directive 77/649/EEC ( 5 ), as last amended by Commission Directive 90/630/EEC ( 6 ), and consequently it is not necessary to give it again in this Directive; whereas reference is made to Council Directive 74/60/EEC ( 7 ), as last amended by Commission Directive 78/632/EEC ( 8 ), and to Council Directive 78/932/EEC ( 9 );
Whereas future consideration should be given to the development of seat strength requirements specific to M2 vehicles, based on experience and accident research. Whereas future consideration should be given to the performance of seats subject to the combined loading of a restrained occupant and an unrestrained passenger behind; whereas a research programme should be undertaken in the next two years with a view to developing a new static seat test procedure which provides an equivalent level of safety compared with the existing dynamic test;
Whereas future consideration should be given to further improvement of the protection provided by head restraints, based on a review of injury patterns, including the possible introduction of neck injury as a performance criterion, based on the use of the Hybrid III test dummy;
Whereas the entry into force of an amendment to Council Directive 77/541/EEC ( 10 ), as last amended by Commission Directive 90/628/EEC ( 11 ), to require seat belts in M2 and M3 vehicles is dependent upon the adaptation to technical progress of Council Directive 76/115/EEC ( 12 ), as last amended by Commission Directive 90/629/EEC ( 13 ), on the anchorages for seat belts and this Directive on the strength of seats;
Whereas the provisions of this Directive are in accordance with the opinion of the Committee for Adaptation to Technical Progress established by Directive 70/156/EEC,
HAS ADOPTED THIS DIRECTIVE:
Article 1
1. The title of Directive 74/408/EEC shall be amended to read: ‘Council Directive 74/408/EEC relating to motor vehicles with regard to the seats, their anchorages and head restraints.’
2. The Articles of Directive 74/408/EEC are amended as follows:
(1) Article 1 shall read at the end: ‘… with the exception of vehicles which run on rails and of agricultural and forestry tractors and all mobile machinery.’;
(2) Article 2 shall read: ‘… on grounds relating to the strength of the seats or their anchorages, or to grant EEC type-approval or national type-approval of a seat on grounds relating to its strength and occupant protection capability, if these meet the requirements set out in Annexes II or III, as applicable, when the vehicle belongs to category M and is equipped with seat belts, and the requirements set out in Annex IV when the vehicle belongs to category M2 or M3 not equipped with seat belts or to category N. The vehicle categories are defined in Annex IIA to Directive 70/156/EEC.’;
(3) Article 3 shall read: ‘… on grounds relating to the strength of the seats or their anchorages, or prohibit the sale, entry into service or use of any seat on grounds relating to its strength and occupant protection capability, if these meet the requirements of the relevant Annexes depending on the category to which the vehicle belongs as set out in Article 2.’;
(4) In Article 4, replace ‘Annex I, 2.2’ by ‘Annex II, 2.2, Annex III, 2.3 or Annex III, 2.4, as applicable’;
(5) In Article 5, replace ‘Annexes I to IV’ by ‘the Annexes’.
3. The Annexes of Directive 74/408/EEC are hereby amended in accordance with the Annex to this Directive.
Article 2
1. With effect from 1 January 1997 no Member State may, on grounds relating to seats, anchorages and head restraints:
— refuse, in respect of a type of motor vehicle or type of seat, to grant EC type-approval, or national type-approval, or
— prohibit the registration, sale or entry into service of vehicles, or the sale or entry into service of seats,
1. if the seats, their anchorages and head restraints comply with the requirements of Directive 74/408/EEC as amended by this Directive.
2. With effect from 1 October 1999 for vehicles of category M2 with a maximum mass not exceeding 3 500 kg and all other vehicles from 1 October 1997, Member States:
— shall no longer grant EC type-approval, and
— may refuse to grant national type-approval,
2. for a type of vehicle on grounds relating to the seats, their anchorages and head restraints, and for a type of seat if the requirements of Directive 74/408/EEC, as amended by this Directive, are not fulfilled.
3. With effect from 1 October 2001 for vehicles of category M2with a maximum mass not exceeding 3 500 kg and all other vehicles in category M and N1 from 1 October 1999, Member States:
— shall consider certificates of conformity which accompany new vehicles in accordance with the provisions of Directive 70/156/EEC to be no longer valid for the purposes of Article 7 (1) of that Directive,
— may refuse the registration, sale and entry into service of new vehicles which are not accompanied by a certificate of conformity in accordance with Directive 70/156/EEC, and
— may refuse the sale and entry into service of new seats,
3. on grounds relating to their seats, anchorages and head restraints if the requirements of Directive 74/408/EEC, as amended by this Directive, are not fulfilled.
4. With effect from 1 October 1999 the requirements of Directive 74/408/EEC relating to seats as components, as amended by this Directive, are applicable for the purposes of Article 7 (2) of Directive 70/156/EEC.
Article 3
Within two years from the date mentioned in Article 4, a review shall be undertaken by the Commission of the following issues:
— the equivalence of static seat testing for the purposes of Annex III,
— the requirements for head restraints for the purposes of Annex II,
— specific seat strength requirements for M2 vehicles,
— strength requirements for seat when subjected to combined loading,
— the applicability of seat belts to side-facing seats.
On the basis of the results of this review, a further amendment of the Directive may be proposed in accordance with the procedure laid down in Article 13 of Directive 70/156/EEC.
Article 4
1. Member States shall bring into force the laws, regulations and administrative provisions necessary to comply with this Directive by 31 December 1996 and shall forthwith inform the Commission thereof.
When the Member States adopt these provisions, they shall contain a reference to this Directive or be accompanied by such reference on the occasion of their official publication. The methods of making such a reference shall be laid down by the Member States.
2. Member States shall communicate to the Commission the texts of the main provisions of national law which they adopt in the field governed by this Directive.
Article 5
This Directive shall enter into force on the 20th day following its publication in the Official Journal of the European Communities.
Article 6
This Directive is addressed to the Member States.
ANNEX
A list of annexes is inserted between the Articles and Annex I to read as follows.
‘LIST OF ANNEXES
ANNEX I: |
Administrative provisions for EEC type-approval. |
|
Appendix 1: Information document (vehicle) |
|
Appendix 2: EEC type-approval certificate (vehicle) |
|
Appendix 3: Information document (component) |
|
Appendix 4: EEC type-approval certificate (component) |
|
Appendix 5: Model for the EEC type-approval mark |
ANNEX II: |
Scope, definitions and requirements for vehicles in category M1. |
|
Appendix 1: Tests and instructions for use |
|
Appendix 2: Test procedure for checking energy dissipation |
|
Appendix 3: Method for testing seat anchorages |
ANNEXE III: |
Scope, definitions & requirements for certain vehicles in categories M2 & M3. |
|
Appendix 1: Test procedures for seats and/or anchorages |
|
Appendix 2: Test procedure for anchorages in a vehicle |
|
Appendix 3: Measurements to be made |
|
Appendix 4: Determination of acceptability criteria |
|
Appendix 5: Static test requirements |
|
Appendix 6: Energy absorption requirements |
ANNEX IV: |
General specifications for vehicles not covered by Annexes II and III.’ |
A new Annex I is inserted as follows:
‘ANNEX I
ADMINISTRATIVE PROVISIONS FOR EEC TYPE-APPROVAL
1. Application for EEC vehicle type-approval
1.1. |
The application for EEC type-approval of a vehicle of category M or N with regard to the seats, their seat anchorages and their head restraints, or of a vehicle of category M2 or M3 with regard to the anchorages, pursuant to Article 3 (4) of Directive 70/156/EEC shall be submitted by the vehicle manufacturer. |
1.2. |
A model for the information document is given in Appendix 1 to this Annex. |
1.3. |
The following must be submitted to the technical service responsible for conducting the type-approval tests:
|
2. Application for EEC component type-approval of a seat
2.1. |
The application for EEC component type-approval of a seat type pursuant to Article 3 (4) of Directive 70/156/EEC shall be submitted by the seat manufacturer. |
2.2. |
►C1
A model for the information document is given in Appendix 3 to this Annex. |
2.3. |
The following must be submitted to the Technical Service responsible for conducting the type-approval tests:
|
3. Granting of EEC type-approval
3.1. |
If the relevant requirements are satisfied EEC type-approval pursuant to Article 4 (3) and, if applicable, Article 4 (4) of Directive 70/156/EEC shall be granted. |
3.2. |
A model for the EEC-type approval certificate is given in:
|
3.3. |
An approval number in accordance with Annex VII to Directive 70/156/EEC shall be assigned to each type of vehicle or each type of seat approved. The same Member State shall not assign the same number to another type of vehicle or to another type of seat. |
4. Modifications of the type and amendments to approvals
4.1. |
In the case of modifications of the type approved pursuant to this Directive, the provisions of Article 5 of Directive 70/156/EEC shall apply. |
5. Conformity of production
5.1. |
As a general rule, measures to ensure the conformity of production shall be taken in accordance with the provisions laid down in Article 10 of Directive 70/156/EEC. |
6. Markings
6.1. |
Every seat conforming to the type approved under this Directive as a component shall bear an EEC type-approval mark. |
6.2. |
This mark shall consist of:
|
6.3. |
The EEC type-approval mark must be affixed to the seat or seats in such a way as to be indelible and clearly legible. |
6.4. |
An example of the EEC type-approval mark is shown in Appendix 5. |
Appendix 1
Information document No …
pursuant to Annex I of Directive 70/156/EEC ( 14 ) relating to EEC type-approval of a vehicle with respect to its seats, anchorages and head restraints, Directive 74/408/EEC, as last amended by Directive 96/37/EC
The following information, if applicable must be supplied in triplicate and include a list of contents. Any drawings must be supplied in appropriate scale and in sufficient detail on size A4 or on a folder of A4 format. Photographs, if any, must show sufficient detail.
If the systems, components, or separate technical units have electronic controls, information concerning their performance must be supplied.
0. General
0.1. |
Make (trade name of manufacturer): |
0.2. |
Type and general commercial description(s): |
0.3. |
Means of identification of type. If marked on the vehicle (b):
|
0.4. |
Category of vehicle (c): |
0.5. |
Name and address of manufacturer: |
0.8. |
Address(es) of assembly plant(s): |
1. General construction characteristics of the vehicle
1.1. |
Photographs and/or drawings of a representative vehicle: |
9. Bodywork
9.1. |
Type of bodywork: |
9.2. |
Materials used and methods of construction: |
9.10. |
Interior fittings
|
Date, file
In the case of applications with respect to seats, their anchorages and, if applicable, their head restraints, all the items listed above except item 9.10.3.4.5 must be indicated.
In the case of applications with respect to seat anchorages of vehicles in category M2 or M3, items 0 to 0.8, 1, 1.1, 9 to 9.2, 9.10.3.4 and 9.10.3.4.5 must be indicated.
Appendix 2
MODEL
(maximum format: A4 (210 × 297 mm))
EEC TYPE-APPROVAL CERTIFICATE
Communication concerning the
of a type of vehicle/component/separate technical unit ( 19 ) with regard to Directive 74/408/EEC, as last amended by Direcctive 96/37/EC.
Type-approval Number:
Reason for extension:
Section I
0.1. |
Make (trade name of manufacturer): |
0.2. |
Type and general commercial description(s): |
0.3. |
Means of identification of type, if marked on the vehicle/component/separate technical unit ( 20 ) ( 21 ):
|
0.4. |
0.5. |
Name and address of manufacturer: |
0.7. |
In the case of components and separate technical units, location and method of affixing of the EEC approval mark: |
0.8. |
Address(es) of assembly plant(s): |
Section II
1. |
Additional Information (where applicable) (see Addendum) |
2. |
Technical service responsible for carrying out the tests: |
3. |
Date of test report: |
4. |
Number of test report: |
5. |
Remarks (if any) (see Addendum) |
6. |
Place: |
7. |
Date: |
8. |
Signature: |
9. |
The index to the information package lodged with the approval authority, which may be obtained on request, is attached. |
Addendum to EEC type-approval certificate No …
concerning the type-approval of a vehicle with regard to Directive 74/408/EEC as last amended by Directive 96/37/EC
1. |
Additional Information
|
5. |
Remarks: |
Appendix 3
Information document No …
relating to EEC type-approval of seats as components,
Directive 74/408/EEC, as last amended by Directive 96/37/EC
The following information, if applicable, must be supplied in triplicate and include a list of contents. Any drawings must be supplied in appropriate scale and in sufficient detail on size A4 or on a folder of A4 format. Photographs, if any, must show sufficient detail.
If the systems, components, or separate technical units have electronic controls, information concerning their performance must be supplied.
0. GENERAL
0.1. |
Make (trade name of manufacturer): |
0.2. |
Type and general commercial description(s): |
0.5. |
Name and address of manufacturer: |
0.7. |
In the case of components and separate technical units, location and method of affixing of the EEC approval mark: |
0.8. |
Address(es) of assembly plant(s): |
1. Description of the device
1.1. |
Characteristics: Description and drawings of
|
1.2. |
Co-ordinates or drawing of the R point (x): |
1.3. |
Range of seat adjustment: |
Date, file
Appendix 4
MODEL
(maximum format: A4 (210 × 297 mm))
EEC TYPE-APPROVAL CERTIFICATE
Communication concerning the
of a type of vehicle/component/separate technical unit ( 29 ) with regard to Direcitve 74/408/EEC, as last amended by Directive 96/37/EC.
Type-approval Number:
Reason for extension:
Section I
0.1. |
Make (trade name of manufacturer): |
0.2. |
Type and general commercial description(s): |
0.3. |
Means of identification of type, if marked on the vehicle/component/separate technical unit ( 30 ) ( 31 ):
|
0.4. |
0.5. |
Name and address of manufacturer: |
0.7. |
In the case of components and separate technical units, location and method of affixing of the EEC type-approval mark: |
0.8. |
Address(es) of assembly plant(s): |
Section II
1. |
Additional Information (where applicable) (see Addendum) |
2. |
Technical service responsible for carrying out the tests: |
3. |
Date of test report: |
4. |
Number of test report: |
5. |
Remarks (if any) (see Addendum) |
6. |
Place: |
7. |
Date: |
8. |
Signature: |
9. |
The index to the information package lodged with the approval authority, which may be obtained on request, is attached. |
Addendum to EEC type-approval certificate No …
concerning the type-approval of a seat type as a component with regard to Directive 74/408/EEC, as last amended by Directive 96/37/EC
1. |
Additional Information
|
5. |
Remarks:
|
Appendix 5
Model for the EEC type-approval mark
The seat bearing the above EEC type-approval mark is a device which has been approved in Spain (e9) under the base approval number 0148 on the basis of this Directive (00). The figures used are only indicative.’
A new Annex II is inserted as follows
‘ANNEX II
SCOPE, DEFINITIONS AND REQUIREMENTS FOR VEHICLES IN CATEGORY M1
1. Scope
1.0. |
The requirements in this Annex apply to vehicles in categories M1. |
1.1. |
The requirements of this Annex do not apply to folding, side-facing or rear-facing seats, or to any head restraint fitted to such seats. |
1.2. |
Head restraints approved according to the requirements of Directive 78/392/EEC shall be deemed to conform with the applicable requirements of this Directive. |
1.3. |
The rear parts of seats situated in Area 1, or the rear parts of head restraints which conform to the requirements of Paragraph 5.7 of Annex I to Directive 74/60/EEC (which relates to interior fittings), shall be deemed to conform to the corresponding requirements of this Directive. |
2. Definitions
For the purposes of this Annex
2.1. |
“Approval of a vehicle” means the approval of a vehicle type with regard to the strength of the seats and their anchorages, the design of the rear parts of the seat backs and the characteristics of the head restraints; |
2.2. |
“Vehicle type” means motor vehicles which do not differ essentially with respect to:
|
2.3. |
“Seat” means a structure which may or may not be integral with the vehicle structure complete with trim, intended to seat one adult person. The term covers both an individual seat or part of a bench seat intended to seat one person; |
2.4. |
“Bench seat” means a structure complete with trim, intended to seat more than one adult person; |
2.5. |
“Anchorage” means the system by which the seat assembly is secured to the vehicle structure, including the affected parts of the vehicle structure; |
2.6. |
“Adjustment system” means the device by which the seat or its parts can be adjusted to a position suited to the morphology of the seated occupant. This device may, in particular, permit:
|
2.7. |
“Displacement system” means a device by which the seat or one of its parts can be displaced or rotated, without a fixed intermediate position, to permit easy access to the space behind the seat concerned; |
2.8. |
“Locking system” means a device ensuring that the seat and its parts are maintained in the position of use; |
2.9. |
“Folding seat” means an auxiliary seat intended for occasional use and normally folded; |
2.10. |
“Transverse plane” mans a vertical plane perpendicular to the median longitudinal plane of the vehicle; |
2.1. |
“Longitudinal plane” means a plane parallel to the median longitudinal plane of the vehicle; |
2.12. |
“Head restraint” means a device whose function is to limit the rearward displacement of an adult occupant's head in relation to his torso in order to reduce the danger of injury to the cervical vertebrae of that occupant in the event of an accident;
|
2.13. |
“R point” means the seating reference point as defined in Annex III to Directive 77/649/EEC; |
2.14. |
“Reference line” means the line on the manikin reproduced in Figure 1. |
3. Requirements
3.1. |
A head restraint shall be mounted on every outboard front seat in every vehicle of category M1. (Seats fitted with head restraints, intended for fitment in other seating positions and in other categories of vehicle, may also be approved to this Annex). |
3.2. |
General requirements applicable to all seats
|
3.3. |
Special requirements for seats fitted or capable of being fitted with head restraints.
|
3.4. |
Height of head restraints
|
3.5. |
In the case of a seat capable of being fitted with a head restraint, the provisions of Paragraphs 3.2.3 and 3.3.2 shall be verified.
|
3.6. |
There shall be no gap of more than 60 mm between the seat back and the head restraint in the case of a device not adjustable for height. If the head restraint is adjustable for height it shall, in its lowest position, be not more than 25 mm from the top of the seat back. In the case of seats or bench seats adjustable in height provided with separate head restraints, this requirement shall be verified for all the positions of the seat or bench seat. |
3.7. |
In the case of head restraints integral with the seat back, the area to be considered is: — above a plane perpendicular to the reference line at 540 mm from the R point; — between two vertical longitudinal planes passing at 85 mm on either side of the reference line. In this area, one or more gaps which regardless of their shape can show a distance “a” of more than 60 mm when measured as described in Paragraph 7 of Appendix 1, are permitted, provided that, after the additional test under Paragraph 4.3.3.2 of Appendix 1, the requirements of Paragraph 3.10 are still met. |
3.8. |
In the case of head restraints adjustable for height one or more gaps, which regardless of their shape can show a distance “a” of more than 60 mm when measured as described in Paragraph 7 of Appendix 1, are permitted on the part of the device serving as a head restraint provided that, after the additional test under Paragraph 4.3.3.2 of Appendix 1, the requirements of Paragraph 3.10 are still met. |
3.9. |
The width of the head restraint shall be such as to provide appropriate support for the head of a person normally seated. As determined according to the procedure described in Paragraph 6 of Appendix 1, the head restraint shall cover an area extending not less than 85 mm to each side of the vertical median plane of the seat for which the head restraint is intended. |
3.10. |
The head restraint and its anchorage shall be such that the maximum backward displacement X of the head permitted by the head restraint and measured in conformity with the static procedure laid down in Paragraph 4.3 of Appendix 1, is less than 102 mm. |
3.11. |
The head restraint and its anchorage shall be strong enough to bear without breakage the load specified in Paragraph 4.3.6 of Appendix 1. In the case of head restraints integral with the seatback, the requirements of this paragraph shall apply to the parts of the seat back structure situated above a plane perpendicular to the reference line at 540 mm from the R point. |
3.12. |
If the head restraint is adjustable, it shall not be possible to raise it beyond the maximum operational height except by deliberate action on the part of the user distinct from any act necessary for its adjustment. |
3.13. |
The strength of the seat back and of its locking devices is deemed to meet the requirements set out in Paragraph 2 of Appendix 1 when, after testing in accordance with Paragraph 4.3.6 of Appendix 1 no breakage of the seat or seat back has occurred; otherwise, it shall be shown that the seat is capable of meeting the test requirements set out in Paragraph 2 of Appendix 1. |
Appendix 1
Tests and instructions for use
1. General specifications applicable to all tests
1.1. |
The seat back, if adjustable, shall be locked in a position corresponding to a rearward inclination as close as possible to 25° from the vertical of the torso reference line of the manikin shown in Figure 1, unless otherwise specified by the manufacturer. |
1.2. |
When a seat, its locking mechanism and its installation are identical or symmetrical with respect to another seat on the vehicle, the technical service may test only one such seat. |
1.3. |
►C1
In the case of seats with adjustable head restraints, the tests shall be conducted with the head restraints placed in the most unfavourable position (generally the highest position) allowed by its adjusting system. |
2. Test of strength of the seat back and its adjustment systems
2.1. |
A force producing a moment of 530 Nm in relation to the R point shall be applied longitudinally and rearwards to the upper part of the seat back frame through a component stimulating the back of the manikin. In the case of a bench seat, where part or all of the supporting frame (including that of the head restraints) is common to more than one seating position, the test shall be conducted simultaneously for all those seating positions. |
3. Test of the strength of the seat anchorage and the adjustment, locking and displacement systems
3.1. |
►C1
A longitudinal horizontal deceleration of not less than 20g shall be applied for 30 ms in the forward direction to the whole shell, or a representative part of the shell, of the vehicle, in accordance with the requirements of Paragraph 1 of Appendix 3. |
3.2. |
A longitudinal deceleration in accordance with the requirements of Paragraph 3.1 shall be applied in the rearward direction. |
3.3. |
The requirements of Pargraphs 3.1 and 3.2 shall be verified for all positions of the seat. In the case of seats fitted with an adjustable head restraint, the test shall be conducted with the head restraints placed in the most unfavourable position (generally the highest position) allowed by its adjusting system. During the test the seat shall be so positioned that no external factor shall prevent the release of the locking systems. These conditions shall be considered to be met if the seat is tested after being adjusted in the following positions: — the longitudinal adjustment is fixed one notch or 10 mm rearward of the most forward normal driving position or position of use as indicated by the manufacturer (for seats with independent vertical adjustment, the cushion shall be placed in its highest position); — the longitudinal adjustment is fixed one notch or 10 mm forward of the most rearward normal driving position or position of use as indicated by the manufacturer (for seats with independent vertical adjustment, the cushion shall be placed in its lowest position), and where appropriate, in accordance with the requirements of Paragraph 3.4. |
3.4. |
In cases where the arrangement of the locking systems is such that, in a seat position other than those defined in Paragraph 3.3, the distribution of the forces on the locking devices and seat anchorages would be less favourable than with either configuration defined in Paragraph 3.3, the tests shall be conducted for that less favourable seating position. |
3.5. |
The test conditions of paragraph 3.1 shall be considered to be satisfied if, at the request of the manufacturer, they are replaced by a collision test of the complete vehicle in running order against a rigid barrier as laid down in paragraph 2 of Appendix 3 to this Annex. In this case, the seat shall be adjusted for the least favourable conditions of distribution of stresses in the anchorage system as provided for in paragaphs 1.1, 3.3 and 3.4. |
4. Test of the performance of the head restraint
4.1. |
If the head restraint is adjustable, it shall be placed in the most unfavourable position (generally the highest position) allowed by its adjustment system. |
4.2. |
In the case of a bench seat, where part or all of the supporting frame (including that of the head restraints) is common to more than one seating position, the test shall be conducted simultaneously for all those seating positions. |
4.3. |
Test
|
5. Determination of the height of the head restraint
5.1. |
All lines, including the projection of the reference line, shall be drawn in the vertical median plane of the seat or seating position concerned, the intersection of such plane with the seat determining the contour of the head restraint and of the seat back (see Figure 1a). |
5.2. |
The manikin described in Annex III to Directive 77/649/EEC shall be placed in a normal position on the seat. |
5.3. |
The projection of the reference line of the manikin is then, in the seat concerned, drawn in the plane specified in Paragraph 4.3.1. The tangent S to the top of the head restraint is drawn perpendicular to the reference line. |
5.4. |
The distance “h” from the R point to the tangent S is the height to be taken into consideration in implementing the requirements of Paragraph 3.4 of Annex II. |
6. Determination of the width of the head restraint (see Figure 1b)
6.1. |
The plane S1, perpendicular to the reference line and situated 65 mm below the tangent S defined in Paragraph 5.3, determines a section in the head restraint bounded by the outline C. |
6.2. |
The width of the head restraint to be taken into consideration in implementing the requirements of Paragraph 3.9 of Annex II is the distance “L” measured in the plan S1 between the vertical longitudinal planes p and p′. |
6.3. |
The width of the head restraint shall if necessary also be determined in the plane perpendicular to the reference line 635 mm above the R point of the seat, this distance being measured along the reference line. |
7. Determination of distance “a” of head restraint gaps (see Figure 3)
7.1. |
The distance “a” shall be determined for each gap and in relation to the front face of head restraint, by means of a sphere having a diameter of 165 mm. |
7.2. |
The sphere shall be put into contact with the gap in a point of the gap area which allows the maximum sphere intrusion, considering no load is to be applied. |
7.3. |
►C1
The distance between the two points of contact of the sphere with the gap will constitute the distance “a” to be considered for the evaluation of the provisions under Paragraphs 3.7 and 3.8 of Annex II. |
8. Tests for checking energy dissipation on the seat back and head restraint
8.1. |
The surfaces of the rear parts of seats to be checked are those situated in the areas defined below which can be contacted by a 165 mm diameter sphere when the seat is mounted in the vehicle.
|
9. Equivalent test methods
If a test method other than those specified in Paragraphs 2, 3, 4 above and Appendix 2 is used, its equivalence shall be proved.
INSTRUCTIONS FOR USE
For seats fitted with adjustable head restraints, the manufacturers shall provide instructions on how to operate, adjust, lock and, where appropriate, remove the head restraints.
Appendix 2
Test procedure for checking energy dissipation
1. Installation, test apparatus, recording instruments and procedure
1.1. |
Setting up
|
1.2. |
Test apparatus
|
1.3. |
Recording instruments The recording instruments used shall be such that measurements can be made with the following degrees of accuracy:
|
1.4. |
Test procedure
|
2. Results
The deceleration rate shall be taken as the average of the readings on the two decelerometers.
3. Equivalent procedures
(see Paragraph 9 of Appendix 1 of this Annex).
Appendix 3
Method for testing the strength of seat anchorages and their adjustment, locking and displacement systems
1. Test of resistance to inertia effects
1.1. |
The seats to be tested shall be mounted on the vehicle body for which they are designed. This vehicle body shall be firmly anchored on a test trolley as prescribed in the following paragraphs. |
1.2. |
The method used for anchoring the vehicle body on the test trolley shall not result in a reinforcement of the seat anchorages. |
1.3. |
The seats and their parts shall be adjusted and locked as prescribed in Paragraph 1.1 and in one of the positions described in Paragraph 3.3 or 3.4 or Appendix 1 of this Annex. |
1.4. |
If the seats of a group do not present essential differences in the sense of Paragraph 2.2 of this Annex, the tests prescribed in Paragraphs 3.1 and 3.2 of Appendix 1 may be carried out with one seat adjusted to its foremost position and the other set adjusted to its rearmost position. |
1.5. |
The trolley deceleration is measured with data channels of frequency class (CFC) 60 corresponding to the characteristics of international Standard ISO 6487 (1980). |
2. Collision test of the complete vehicle against a rigid barrier
2.1. |
The barrier shall consist of a block of reinforced concrete of not less than 3 m width, not less than 1.5 m in height and not less than 0.6 m in thickness. The front face shall be perpendicular to the final part of the run-up track and shall be covered with plywood boards 19 ± 1 mm thick. At least 90 tonnes of earth shall be compressed behind the block of reinforced concrete. The barrier of reinforced concrete and earth may be replaced by obstacles having the same front surface, provided, that they give equivalent results. |
2.2. |
At the moment of impact the vehicle shall run free. It shall reach the obstacle on a course perpendicular to the collision wall; the maximum lateral misalignment allowed between the vertical median line of the front of the vehicle and the vertical median line of the collision wall shall be ± 30 cm; at the moment of impact the vehicle shall no longer be subjected to the action of any additional steering or propelling device. The speed on impact shall be between 48.3 km/h and 53.1 km/h. |
2.3. |
The fuel feed system shall be filled with water to a mass equal to 90 % of a full tank as specified by the manufacturer.
|
Figure 1a
Figure 1b
Figure 2
Figure 3
Determination of Dimension “a” of Head Restraint Gaps
Example of Horizontal Gaps
Note:
Section A-A is to be made in a point of the gap area which allows the maximum sphere intrusion without exerting any load.
Example of Vertical Gaps
Note:
Section A-A is to be made in a point of the gap area which allows the maximum sphere intrusion without exerting any load.’
A new Annex III is inserted as follows:
‘ANNEX III
SCOPE, DEFINITIONS AND REQUIREMENTS FOR CERTAIN VEHICLES IN CATEGORIES M2 AND M3
1. Scope
1.1. |
This Annex applies to seats in vehicles in categories M2 and M3, except vehicles in these categories which are designed for both urban use and standing passengers, in respect of:
|
1.2. |
M2 vehicles may be approved to Annex II as an alternative to this Annex. |
1.3. |
Vehicles where some seats benefit from the derogation provided in Item 5.5.4 of Annex I to Directive 76/115/EEC shall be approved to this Annex. |
1.4. |
The tests described in this Annex may also be applied to other vehicle parts (including rear facing seats), as referred to in Paragraph 3.1.10 of Annex I to Directive 77/541/EEC and Paragraph 4.3.7 of Annex I to Directive 76/115/EEC. |
2. Definitions
For the purposes of this Annex:
2.1. |
“Approval of a seat” means an approval of a seat type as a component in relation to the protection of the occupants of forward-facing seats with regard to their strength and the design of the seat backs; |
2.2. |
“Approval of a vehicle” means an approval of a vehicle type with regard to the strength of the parts of the vehicle structure to which seats are to be secured, and with regard to the installation of seats; |
2.3. |
“Seat type” means seats which do not differ essentially with respect to the following characteristics likely to affect their strength and their aggressiveness:
|
2.4. |
“Vehicle type” means vehicles which do not differ essentially in respect of: — the constructional features relevant to this Directive; and, — the type or types of EC component type approved seat(s) fitted to the vehicle, if any. |
2.5. |
“Seat” means a structure likely to be anchored to the vehicle structure, including its trim and attachment fittings, intended to be used in a vehicle, and to seat one or more adult persons; |
2.6. |
“Individual seat” means a seat designed and constructed for the accommodation of one seated passenger; |
2.7. |
“Double seat” means a seat designed and constructed for the accommodation of two seated passengers side by side; two seats side by side and having no interconnection shall be regarded as two individual seats; |
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 angle of 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; |
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 ( 51 ). |
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 of the apparatus, described in Annex II of Directive 74/60/EEC, from vertical to horizontal. The apparatus shall be positioned as described in that Annex and set to the maximum length of 840 mm. |
2.22. |
“Three-point belt” for the purposes of this Directive also includes belts with more than three anchorage points. |
2.23. |
“Seat pitch” means the horizontal distance between successive seats measured from the front of the seat back on one to the rear of the seat back of the seat in front, at a height of 620 mm above the floor. |
3. Requirements for seats
3.1. |
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. |
3.2. |
The tests which the seat type has passed shall be recorded in the Addendum to the Approval Certificate (Appendix 4 of Annex 1). |
3.3. |
Every adjustment and displacement system provided shall incorporate a locking system, which shall operate automatically. |
3.4. |
The adjustment and locking systems shall not be required to be in full working order after the test. |
3.5. |
A head restraint shall be mounted on every outboard front seat in every vehicle of category M2 with a maximum mass not exceeding 3 500 kg; head restraints mounted in such vehicles shall comply with the requirements of this Annex or Directive 78/932/EEC. |
4. Requirements for seat anchorages of a vehicle type
4.1. |
The anchorages for the seats on the vehicle shall be capable of withstanding:
|
4.2. |
Permanent deformation, including breakage, of an anchorage or the surrounding area shall be permissible provided the prescribed force has been sustained throughout the prescribed period. |
4.3. |
When there is more than one type of anchorage on a vehicle, each variant shall be tested in order to obtain approval for the vehicle. |
4.4. |
One test may be used to approve simultaneously a seat and a vehicle. |
4.5. |
►C1
In the case of vehicles of category M3, seat anchorages shall be deemed to comply with the requirements of Paragraphs 4.1 and 4.2 if the safety belt anchorages of the corresponding seating positions are fitted directly to the seats to be installed and these belt anchorages comply with the requirements of Directive 76/115/EEC, if necessary with the derogation provided in Item 5.5.4 of Annex I thereof. |
5. Requirements for installation of seats in a vehicle type
5.1. |
All forward-facing seats installed shall be approved to the requirements of Paragraph 3 of this Annex and subject to the following conditions:
|
5.2. |
When approved to Appendix 1, Tests 1 and 2 shall apply except as follows:
|
5.3. |
When approved to Appendices 5 and 6, all tests shall apply except as follows:
|
Appendix 1
test procedures for seats according to Paragraph 3 and/or anchorages according to paragraph 4.1.2
1. Requirements
1.1. |
The tests are to determine:
|
1.2. |
All fittings forming part of the back of the seat or accessories thereto shall be such as to be unlikely to cause any bodily injury to a passenger during impact. This requirement shall be considered satisfied if any part contactable by a sphere 165 mm in diameter presents a radius of curvature of at least 5 mm.
|
2. Preparation of the seat to be tested
2.1. |
The seat to be tested shall be mounted:
|
2.2. |
The anchorage on the testing platform provided for the test seat(s) shall be identical to or have the same characteristics as that used in vehicle(s) in which the seat is intended to be used. |
2.3. |
The seat to be tested shall be complete with all upholstery and accessories. If the seat is fitted with a table, it shall be in the stowed position. |
2.4. |
If adjustable laterally, the seat shall be positoned for maximum extension. |
2.5. |
If adjustable, the seat back shall be adjusted so that the resulting inclination of the torso of the manikin used for determing the H-point and the actual torso angle for seating positions in motor vehicles is as close as possible to that recommended by the manufacturer for normal use or, in the absence of any particualar recommendation by the manufacturer, as near as possible to 25° towards the rear in relation to the vertical. |
2.6. |
If the seat back is equipped with a head restraint adjustable for height, it shall be in its lowest position. |
2.7. |
Seat belts of an approved type, conforming to Directive 77/541/EEC and mounted on anchorages installed according to Directive 76/115/EEC shall be fitted to both the auxiliary seat and the seat to be tested. |
3. Dynamic tests
3.0. |
Test 1 |
3.1. |
The testing platform shall be mounted on a trolley. |
3.2. |
Auxiliary seat The auxiliary seat may be the same type as the seat being tested and shall be located parallel to and directly behind the seat being tested, the two seats being at the same height, adjusted identically and on a pitch of 750 mm.
|
3.3. |
Manikin A manikin shall be installed behind each seating position of the seat to be tested as follows:
|
3.4. |
Impact simulation
|
3.5. |
Test 2
|
Figure 1
Appendix 2
Test procedure for the anchorages of a vehicle in application of Paragraph 4.1.1
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, ect.) provided by the manufacturer. |
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:
|
2.2. |
The force F shall be determined either
|
Appendix 3
Measurements to be made
1. |
All measurements necessary shall be made with measurement systems corresponding to the specifications of International Standard ISO 6487 entitled “Technique of measurement in impact tests: Instrumentation” and published in 1987. |
2. |
Dynamic test
|
Appendix 4
Determination of acceptability criteria
1. Head acceptability criterion (HAC)
1.1. |
This acceptability criterion (HAC) is calculated on the basis of the resultant triaxial acceleration measured according to Appendix 3, Paragraph 2.2.1 by the following expression: HAC = t2 − t11t2 − t1 ∫ t2t1 γrdt2,5 in which t1 and t2 are any values of time during the test, HAC being maximum value for and interval t1 and t2. The value of t1 and t2 are expressed in seconds. |
2. Thorax acceptability criterion (ThAC)
2.1. |
This criterion is determined by the absolute value of the 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.
Appendix 5
Statistic test requirements and procedure
1. Requirements
1.1. |
The requirements for seats tested according to this Appendix are to determine:
|
1.2. |
The requirements of Paragraph 1.1.1 shall be considered satisfied if the maximum displacement of the central point of application of each force prescribed in Paragraph 2.2.1 measured in the horizontal plane and in the longitudinal median plane of the relevant seating position does not exceed 400 mm. |
1.3. |
The requirements of Paragraph 1.1.2 shall be considered satisfied if the following characteristics are met:
|
1.4. |
The requirements of Paragraphs 1.1.3 shall be considered satisfied if:
|
2. Static tests
2.1. Test apparatus
2.1.1. |
This consists of cylindrical surfaces with a radius of curvatur equal to 82 (± 3 mm) and a width:
|
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. |
A test force to
shall be applied using a device, conforming to Paragraph 2.1, to the rear part of the seat corresponding to each seating position of the seat.
|
2.2.2. |
A test force equal to
shall be applied simultaneously to the rear part of the seat corresponding to each seating position of the seat in the same vertifical plane and in the same direction at the height H2 which shall be between 0,45 and 0,55 m above the reference plane, with a device confirming to Paragraph 2.1. The exact height shall be determined by the manufacturer. |
2.2.3. |
The test forms 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. 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 simultaneoulsy 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 Paragraph 2.2.1 and 2.2.2 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. |
2.2.7. |
If the test has been carried out with one or more forces but not with all the forces greater than those specified in Paragraphs 2.2.1 and 2.2.2 and if the seat complies with the requirements, the test shall be considered to be satisfied. |
Figure 1
Appendix 6
Energy absorption characteristics of the rear part of seat backs for vehicles in categories M2 and M3
1. |
►C1
Elements of the rear part of seat backs situated in the reference zone, as defined in Paragraph 2.21 of this Annex, shall be verified at the request of the manufacturer according to the energy absorbing requirements set out in Annex III of Directive 74/60/EEC. 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 Addendum to the Approval Certificate of the seat (Appendix 4 of Annex 1). A drawing showing the area of the rear part of the seat back, verified by the energy dissipation test, shall be enclosed. |
3. |
This test may be applied to parts of a vehicle other than a seat (Paragraph 3.5.3 of Appendix 1).’ |
A new Annex V is inserted as follows:
‘ANNEX IV
GENERAL SPECIFICATIONS FOR VEHICLES NOT COVERED BY ANNEXES II AND III
1. General
1.1. |
The requirements set out in this Annex apply to vehicles in categories N1, N2 or N3 and those in categories M2 and M3 not covered by Annex III. |
2. General specifications
2.1. |
Seats and bench seats must be firmly attached to the vehicle. |
2.2. |
Sliding seats and bench seats must be automatically lockable in all the positions provided. |
2.3. |
Adjustable seat backs must be lockable in all the positions provided. |
2.4. |
All seats which can be tipped forward or have fold-on backs must lock automatically in the normal position. |
2.5. |
A head restraint shall be mounted on every outboard front seat in every vehicle of category M2 with a maximum mass not exceeding 3 500 kg and of category N1; head restraints mounted in such vehicles shall comply with the requirements of Annex II or of Directive 78/932/EEC.’ |
( 1 ) OJ No L 42, 23. 2. 1970, p. 1.
( 2 ) OJ No L 266, 8. 11. 1995, p. 1.
( 3 ) OJ No L 221, 12. 8. 1974, p. 1.
( 4 ) OJ No L 209, 29. 7. 1981, p. 34.
( 5 ) OJ No L 267, 19. 10. 1977, p. 1.
( 6 ) OJ No L 341, 6. 12. 1990, p. 20.
( 7 ) OJ No L 38, 11. 2. 1974, p. 2.
( 8 ) OJ No L 206, 29. 7. 1978, p. 26.
( 9 ) OJ No L 325, 20. 11. 1978, p. 1.
( 10 ) OJ No L 220, 29. 8. 1977, p. 95.
( 11 ) OJ No L 341, 6. 12. 1990, p. 1.
( 12 ) OJ No L 24, 30. 1. 1976, p. 6.
( 13 ) OJ No L 341, 6. 12. 1990, p. 14.
( 14 ) The item numbers and footnotes used in this information Document correspond to those set out in Annex I to Directive 70/156/EEC. Items not relevant for the purpose of this Directive are omitted.
( 15 ) Delete where not applicable
( 16 ) Delete where not applicable
( 17 ) Delete where not applicable
( 18 ) Delete where not applicable
( 19 ) Delete where not applicable
( 20 ) Delete where not applicable
( 21 ) If the means of identification of type contains characters not relevant to a description of the vehicle, component or separate technical unit types covered by this type-approval certificate, such characters shall be represented in the documentation by the symbol “?” (e.g. ABC??123??).
( 22 ) As defined in Annex II A to Directive 70/156/EEC
( 23 ) Delete where not applicable
( 24 ) Delete where not applicable
( 25 ) Delete where not applicable
( 26 ) Delete where not applicable
( 27 ) Delete where not applicable
( 28 ) Delete where not applicable
( 29 ) Delete where not applicable
( 30 ) Delete where not applicable
( 31 ) If the means of identification of type contains characters not relevant to a description of the vehicle, component or separate technical unit types covered by this type-approval certificate, such characters shall be represented in the documentation by the symbol “?” (e. g. ABC??123??).
( 32 ) As defined in Annex II A to Directive 70/156/EEC.
( 33 ) Delete where not applicable
( 34 ) Delete where not applicable
( 35 ) Delete where not applicable
( 36 ) Delete where not applicable
( 37 ) Delete where not applicable
( 38 ) Delete where not applicable
( 39 ) Delete where not applicable
( 40 ) Delete where not applicable
( 41 ) Vehicles of category M1 are considered to comply with the provisions of paragraphs 3.2.3 and 3.2.4 of this Annex provided that they comply with the provisions of Directive 74/60/EEC.
( 42 ) Vehicles of category M1 are considered to comply with the provisions of paragraphs 3.2.3 and 3.2.4 of this Annex provided that they comply with the provisions of Directive 74/60/EEC.
( 43 ) Until 1. 10. 1999 for new vehicle types and 1. 10. 2001 for all vehicles, the value of 750 mm shall apply.
( 44 ) Until 1. 10. 1999 for new vehicle types and 1. 10. 2001 for all vehicles, the value of 700 mm shall apply.
( 45 ) Until 1. 10. 1999 for new vehicle types and 1. 10. 2001 for all vehicles, the value of 750 mm shall apply.
( 46 ) Until 1. 10. 1999 for new vehicle types and 1. 10. 2001 for all vehicles, the value of 700 mm shall apply.
( 47 ) Until 1. 10. 1999 for new vehicle types and 1. 10. 2001 for all vehicles, the value of 700 mm shall apply.
( 48 ) Until 1. 10. 1999 for new vehicle types and 1. 10. 2001 for all vehicles, the value of 700 mm shall apply.
( 49 ) Until 1. 10. 1999 for new vehicle types and 1. 10. 2001 for all vehicles, the value of 700 mm shall apply.
( 50 ) The relationship of the reduced mass “mr” of the pendulum to the total mass “m” of the pendulum at a distance “a” between the centre of percussion and the axis of rotation and at a distance “l” between the centre of gravity and the axis of rotation is given by the formula: mr = m. 1/a.
( 51 ) The technical specifications and detailed drawings of Hybrid II and III, corresponding to the principal dimensions of a fiftieth percentile male of the United States of America, and the specifications for its adjustment for this test are deposited with the Secretary-General of the United Nations and may be consulted on request at the secretariat of the Economic Commission for Europe, Palais des Nations, Geneva, Switzerland.
( 52 ) Expressed in g (= 9,81 m/sec2) the scalar value of which is calculated according to the following formula:
γr 2 = γl 2 + γv 2 + γt 2
where: |
γl = value of instant longitudinal acceleration, γv = value of instant vertical acceleration, γt = value of instant transversal acceleration. |