Document ID: chunk:federal_register_of_legislation:F2021C00450:body:0:p4
Version: federal_register_of_legislation:F2021C00450
Segment Type: other
Provision Reference: 
Character Range: 11274–14696

the weight of the entire 'Seat' back is applied at the centre of mass of the 'Seat' back.
5.8.5.                              If non-self-locking auxiliary latches are provided they must be unlatched during testing so that only the restraining device and hinges are taking the test loads.
5.8.6.                              Where 'Seats' are mounted on hinged covers, e.g. engine covers, and the 'Seat' assembly can withstand the test loads without tilting of the hinged cover and without any latches being latched, then the latches need not be self-locking.
5.9.                                    Energy Dissipation
  The surfaces of the rear parts of 'Seats' to be checked are:
5.9.1.                              All 'Contactable' surfaces in Area 1 as defined in clause 6.5.1 and;
5.9.2.                              All 'Contactable' surfaces exhibiting radii of curvature less than 5 mm in Area 2 as defined in clause 6.5.2
5.9.3.                              These surfaces when tested as per clause 6.4 must not produce a deceleration of the moving head greater than 80 times the acceleration due to gravity continuously for more than 3 ms.
5.9.4.                              The requirements of clause 5.9 do not apply to rearmost 'Seats' or back-to-back 'Seats' or vehicles with only a single row of 'Seats'.
6.                                          TEST PROCEDURE
6.1.                                    General
6.1.1.                              Static or dynamic testing techniques may be used.
6.1.2.                              The 'Seat' travel stops must not take any part of the test load.
6.1.3.                              Hinged 'Seats', or 'Seats' with backs which are adjustable for passenger comfort only, must be tested with the 'Seat' back at the design 'Seat Back Angle'.
6.1.4.                              The requirements of clause 5.5.1 and clause 5.5.2 are considered to be met if the 'Seat' is tested after being adjusted in the following two positions:
6.1.4.1.                        the longitudinal adjustment is fixed one notch or 10 mm rearwards of the most 'Forward' normal driving or use position (for 'Seats' with independent vertical adjustment the cushion must be placed in its highest position);
6.1.4.2.                        the longitudinal adjustment is fixed one notch or 10 mm forwards of the most 'Rearward' normal driving or use position (for 'Seats' with independent vertical adjustment the cushion must be placed in its lowest position).
6.2.                                    Static Test Conditions
6.2.1.                              Static testing of 'Seats' must be conducted in accordance with SAE document J879b "Motor Vehicle Seating Systems", July 1968 using the values specified in and the procedures applicable to this rule.
6.2.2.                              Distributed loads may be replaced by concentrated loads at the loading centroid.
6.2.3.                              Specified loads must be sustained for at least one second.
6.2.4.                              Notwithstanding the requirements of the test procedure specified in clause 6.2.1, the testing of 'Seats' must meet the test requirements specified in clause 6.1 of this rule.
6.3.                                    Dynamic Test Conditions
6.3.1.                              Dynamic testing must be conducted at the vehicle 'Manufacturer's' choice either to clause 6.3.2 or