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One-Engine Inoperative Cruise Speed (ETOPS)

One-Engine Inoperative Cruise Speed (ETOPS) – For the purposes of those sections of part 121 applicable to ETOPS, the one-engine inoperative cruise speed is a speed within the certified operating limits of the airplane that is specified by the certificate holder and approved by the FAA for calculating required fuel reserves needed to account for an inoperative engine, or determining whether an ETOPS alternate is within the maximum diversion time authorized for an ETOPS flight.

 Source FAA  AC 120-42B

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