AMC E 710 Rotor locking tests

• ED Decision 2007/015/R found in: CS-E Amdt 5 - Engines (Dec 2018)

AMC E 710 Rotor locking tests ED Decision 2007/015/R (1) The applicant has the option to incorporate a rotor-locking device into the type design of the Engine in order not to have to comply with [CS-E 525](#_DxCrossRefBm1371447609). Activation of the device will stop and prevent subsequent continued rotation of the Engine rotor(s) during flight when the Engine is not operating. The device is part of the Engine type design and is subject to the same test criteria as other components on the Engine. In addition, the rotor-locking device should satisfy the operational and endurance test specifications identified in [CS-E 710](#_DxCrossRefBm1371447602) while the Engine is subjected to the environmental conditions that result in the maximum rotational torque. The assessment of the maximum rotational torque should consider both damaged and undamaged Engine rotors. (2) An Engine that is shut down and that has a rotor locking device but continues to rotate due to Failure of the rotor locking device might not satisfy the safety objectives of [CS-E 525](#_DxCrossRefBm1371447609). Therefore the design of the rotor-locking device should be assessed for all possible Failure modes under [CS-E 510](#_DxCrossRefBm1371447574). The effects of an uncommanded or inadvertent activation of the rotor-locking device in flight should be considered. (3) Due to the expected infrequency of using the rotor locking device, it should be designed such that under normal Engine operating conditions it will not deteriorate beyond serviceable limits to the extent that it fails to perform its intended function when activated during an Engine shut down (see also [CS-E 510(e)](#_DxCrossRefBm1371447574)). (4) The rotor-locking device should be designed in such a manner that it is possible for the flight crew to unlock the Engine rotor(s) in order to initiate Engine restart attempts. In the event these attempts are unsuccessful, the flight crew should be able to re-lock the Engine rotor(s). (5) The effects of the temperature of the induction air and external surfaces of the Engine should be considered where relevant to the design. [Amdt. No.: E/1]