Although a number of aerobatic manoeuvres were permitted in Tiger Moth aircraft, there was no limitation on the amount of aerobatic operations that was considered to be safe. As a result, operators may be unaware that a high aerobatic usage may exceed the original design assumptions for the aircraft.
Initial ATSB advice of the safety issue
The ATSB corresponded with de Havilland Support Ltd about this issue during the investigation. In addition, the draft safety issue was included in the draft investigation report.