AMC E 920 Over-temperature test

For the purpose of the test of CS-E 920, "Maximum power-on rpm" is normally the steady state rotor speed associated with the 30-Second OEI Power rating. However, this speed should be substituted by the transient rotor speed if the Engine characteristic transient speed stabilisation exceeds 3 seconds during the transition to the 30-Second OEI power. In order to demonstrate that the Engine maintains the integrity of the turbine assembly after the overtemperature test, the applicant should show that no burst, no blade Failure or no other significant Failure of any Engine component would occur or become evident during the test, during shutdown or during the subsequent strip examination. In the event that any Failure becomes evident, this should be analysed and it should be established by analysis or test that the cause is not such that in service the OEI rating structure would not be satisfactorily achieved.

[Amdt. No.: E/1]