Maximum Diversion Time – For the purposes of ETOPS in 121.161 and related ETOPS regulations, maximum diversion time (for example 120 minutes, 180 minutes, 240 minutes, and, beyond 240 minutes) is the longest diversion time authorized for a flight under the operator’s ETOPS authority. It is calculated under standard conditions in still air at a one-engine inoperative cruise speed.
Source FAA AC 120-42B
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