Proposal to introduce limit values for the chest vertical acceleration (Az) of Q dummies during dynamic testing of Enhanced Child Restraint Systems (ECRS) until such time as upper neck tension Force (Fz) and upper neck flexion moment (My) criteria can be established.

Proposal to update a reference with the new European Committee for Standardization (CEN) published EN 71-3:2019 on 10 April 2019 and to delete a cut-and-paste error in Annex 6, Appendix 2 taken from UN R44 referring to ECRS as in the “restricted” category which does not exist in UN R129.

Proposal to update a reference with the new European Committee for Standardization (CEN) published EN 71-3:2019 on 10 April 2019, to delete a cut-and-paste error in Annex 6, Appendix 2 taken from UN R44 referring to ECRS as in the “restricted” category which does not exist in UN R129, and to reconcile and consolidate various references to tolerances for the internal geometry assessment.

Proposal to clarify the requirements for the type approval category of booster seats over 135 cm, to update a reference with the new European Committee for Standardization (CEN) published EN 71-3:2019 on 10 April 2019, to delete a cut-and-paste error in Annex 6, Appendix 2 taken from UN R44 referring to ECRS as in the “restricted” category which does not exist in UN R129, and to reconcile and consolidate various references to tolerances for the internal geometry assessment.

Proposal

• to clarify the requirements for the type approval of booster seats in the over 135 cm category,
• to update a reference with the new European Committee for Standardization (CEN) published EN 71-3:2019 on 10 April 2019,
• to delete a cut-and-paste error in Annex 6, Appendix 2 taken from UN R44 referring to ECRS as in the “restricted” category which does not exist in UN R129,
• to reconcile and consolidate various references to tolerances for the internal geometry assessment, and
• to exclude the head acceleration criterion in certain cases of contact when testing booster cushions with the larger Q-dummies, in particular the Q10, due to dummy rebound over the back of the test bench during a frontal test.

Proposal to specify the Q6 dummy in lieu of the Q3 with regard to integral ECRS testing and to add the Q3 to the already existing Q6 under the 02 series of amendments.

Proposal to:

• Remove a residual reference in Annex 22 to ‘temporary’ requirements for belt-attached infant carrier modules;
• Extend and adapt the minimum breaking load requirements to cover the webbing straps of all categories of integral enhanced child restraint systems (not only i-Size); and
• Clarify that Integral Belted enhanced child restraint categories are required to undergo rear or lateral dynamic impact testing.

Proposal to align UN R129 with the descriptions used in of UN R44 and UN R94 which refer to resultant head and chest accelerations.

Proposal to provide information on the essential measurement information that needs to be recorded in the Type Approval test report

Proposal to improve the repeatability and reproducibility of the assessment of the external dimensions of the ECRS. It does not change any current dimensional requirements relating to the sizes of the body of the ECRS, the support leg or the support leg foot.

Proposal based on document GRSP/2019/19 to define the introduction of limit values for chest vertical acceleration of Q-dummies during dynamic testing of Enhanced Child Restraint Systems (ECRS).