ETOPS Area of Operation – For turbine-engine-powered airplanes with two engines an area beyond 60 minutes from an adequate airport, or with more than two engines in passenger-carrying operations, an area beyond 180 minutes from an adequate airport, and within the authorized ETOPS maximum diversion time approved for the operation being conducted. An ETOPS area of operation is calculated at an approved one-engine inoperative cruise speed under standard conditions in still air.
Source FAA AC 120-42B
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