On behalf of Mr. Kolb (Bertrandt), who unfortunately could not be present, Mr. Roth presented document GTR9-6-24. He concluded that the test results lead to some question marks since the behavior of the legform especially in the inverse tests shows some clear trends to get worse. However, Bertrandt did not have a chance to double-check what the root cause for the steadily decreasing test results in the inverse tests was. Mr. Zander wondered whether the time history curves could be provided that may allow better assessment. Mr. Roth will bring this back to Mr. Kolb. Mr. Knotz asked to also add more information about other conditions such as velocities etc. Mr. Stammen and Mr. Zander added that it would also be useful to know more about the tests that had been conducted in between. Mr. Martin wondered whether information is available on the time periods – were tests conducted with longer time gaps in between or just at some consecutive days. Also, he wondered how long it takes to conduct two consecutive tests. Mr. Knotz and Dr. Konosu explained how labs usually conduct the tests. Finally it was concluded that Mr. Roth will try to clarify all these details with Mr. Kolb and come back to this.

Also, some discussion came up on the certification tests. Mr. Zander pointed out that this again proves that the inverse tests better detects issues with the legform. Dr. Konosu replied that, however, the test can also not deliver more detailed information on the reasons. After some further discussion Mr. Zander agreed to check whether any subsequent inverse certification test was performed afterwards at BASt. Also, the logbook information will be made available to complete the picture on this.