GTR 7: Proposal for Amendment 1 (Phase 2 development)
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Proposal to introduce a new measurement procedure for the effective height of the head restraint and introduction of the Biofidelic Rear Impact Device (BioRID). This proposal eliminates the backset measurement test procedure using the HRMD method.

Reference Number: GRSP-64-39/Rev.1
Origin: Germany, Japan, and Netherlands
Date: 13 December 2018
Proposal Status: Superseded
Related Documents:
GRSP/2018/27 | GTR 7: Proposal for Amendment 1
GRSP/2019/5 | GTR 7: Proposal for Amendment 1 (Phase 2)
Working Party on Passive Safety | Session 64 | 11-14 Dec 2018

4. The expert from Germany introduced GRSP-64-38, to present the proposed Amendment 2 (GRSP-64-39-Rev.1 superseding ECE/TRANS/WP.29/GRSP/2018/27) to UN GTR No. 7 (Phase 2 of the UN GTR on head restraints), jointly prepared with the experts from Japan and the Netherlands. He explained that the proposal still has several items, in several square brackets, to be solved. However, he added that the draft amendment would introduced five main changes to the UN GTR:

  1. Procedure for establishing the height of the head restraint base on the head contact rather than at its absolute height;
  2. Height measurement test procedure;
  3. Deletion of the backset measurement test procedure using the H-point machine method;
  4. Introduction of the backset measurement test procedure using the R-point method; and
  5. Introduction of the dynamic performance test procedure, by using the Biomechanical Rear Impact Dummy (BioRID) and empirical criteria instead of biomechanical (due to the absence of an absolute medical definition of whiplash) to establish seat performance.

6. Finally, GRSP experts were invited to provide comments to GRSP-64-39-Rev.1 and GRSP-64-40 to the expert from Japan by the end of January 2019. Moreover, it was agreed that IWG organize a webex meeting to allow the expert from Japan to submit an official proposal of amendments, which would also incorporate GRSP-64-25 (see para. 16 of this report) by 15 February 2019.