Proposal from Spain on behalf of the Technical Services Group (TSG) on UN R129 to allow the head of the dummy to pass the DE plane provided there is a structure (e.g., head pad or backrest) that provides adequate protection for the head. Under UN R129, the combination of a stiffer test bench foam and the design of the test dummy can mean that when testing forward-facing child restraints (including boosters), the dummy’s head often passes the DE plane. The Q-series dummies are not proven to be biofidelic during the rebound phase of the impact test. In such cases, the head pad or backrest provides protection to the child’s head and the energy-absorption properties of this structure will have been tested using the test method described in UN Regulation No. 129.
33. The expert from Spain introduced ECE/TRANS/WP.29/GRSP/2018/19, ECE/TRANS/WP.29/GRSP/2018/20, ECE/TRANS/WP.29/GRSP/2018/21 and ECE/TRANS/WP.29/GRSP/2018/22 aimed at providing better provisions for the dummy’s head displacement when surpassing the reference plane DE during frontal and rear impact tests of forward facing Enhanced Child Restraint Systems. The expert from Germany argued that the current text of the UN Regulation prevented the contact of the head. He added that dummies have performance limits and that in this context these limitations would not affect the test results. The GRSP Chair requested the expert from Spain to provide better rationales for the sled test and to clarify if her proposals also referred to vehicle tests. GRSP agreed to resume discussion on this subject at its December 2018 session.