The chair mentioned that three proposals for the subject are available. He proposed to first receive all presentations and then enter into discussion on this.

Mr. Takagi presented document GTR9-6-11. He stated that it does not seem necessary to specify the rebound phase in detail since this is also not done in other legislation.

The presentation of BASt (document GTR9-6-07) was introduced by Mr. Zander. He explained that, according to his opinion, it would be more appropriate to define a biofidelic assessment interval that covers all possible cases as explained.

Dr. Ries presented the ideas of OICA on the rebound phase. He explained that it seems to be very hard to specify a rebound phase since it may be different for different vehicle categories. However, he pointed out that the method proposed by OICA covers the waste majority of vehicles and only in very rare cases additional checks would be necessary.

The chair invited the audience to discuss the issue. Discussion came up on when the rebound phase starts. Mr. Zander confirmed on request of Mr. Roth that the interval should be considered in which the FlexPLI behaves like the human or the human model respectively. Dr. Ries pointed out that then the interval proposed seems much too long since the legform is only for the first contact confirmed to be biofidelic. Also, this period may be different for tibia and knee. He and Mr. Roth wondered how BASt specified the length of their Biofidelic Assessment Interval and Mr. Zander responded that an objective method and automatic evaluation method was requested. There is no clue that the impactor biofidelity is limited to the pure contact phase with the vehicle only. The BAI can solve this issue. In addition, it covers all potential critical loadings during the test. Partly, the BAI interval is even shorter than the interval proposed by industry in document GTR9-5-30. This was demonstrated in document GTR9-6-07. The secretary reminded the attendees that some information on this had also been shown in the TF-BTA meeting held on 18 March 2013 and that the information is already available on the website. (Note of the secretary: The documents referred to were presented in the 3rd meeting of the Task Force Bumper Test Area as documents TF-BTA-3-03, TF-BTA-3-07 and TF-BTA-3-08 and are available on the respective UNECE website.)

After some discussion the chair proposed that the detailed discussion on this should be held during the next meeting and that a final conclusion should be made then (action item A-6-09). Also, it was noted that the action items A-5-05 and A-5-06 can be closed with the presentations above.