AMC E 50(j) Controls - Engines having a 30-Second OEI Power Rating
ED Decision 2007/015/R
(1) The 30-Second OEI rating is intended to provide a rotorcraft with a power reserve in the event of one Engine becoming inoperative. The flight and operating conditions requiring use of this rating may create a high pilot workload to maintain safe flight. Therefore the 30-Second OEI rating should be applied and controlled by an automatic means that requires no pilot input or control other than termination command. Once activated, it automatically controls the 30-Second OEI power and prevents the Engine from exceeding its limits, specified in the Engine's type certificate data sheet and associated with this rating. Because the 30-Second OEI rating could already use almost all the available margins in the Engine design, it is considered that exceeding the limits associated with this rating would likely result in an Engine Failure, which would be unacceptable in a critical flight condition with an already failed Engine.
The required automatic control of the 30-Second OEI power is intended to avoid the need for monitoring Engine parameters such as output shaft torque or power, output shaft speed, gas generator speed and gas path temperatures. Such means for automatic control within the operating limitations should be effective during normal and abnormal operations.
(2) The means required by CS-E 50(j) should not prevent the Engine from reaching and maintaining its rated 30-Second OEI Power. See also paragraph (5) of AMC E 20(f).
[Amdt. No.: E/1]
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