Definitions

This regulation defines key terms used in Part 121's Extended Operations (ETOPS) rules, which govern flights that venture far from suitable airports.

ETOPS applies when twin-engine airplanes fly more than 60 minutes from an adequate airport, or when passenger planes with three or more engines fly beyond 180 minutes from one. These times are calculated at one-engine-inoperative cruise speed in still air.

An adequate airport must meet Part 121 landing requirements and either comply with Part 139 standards (minus some firefighting requirements) or be an active military airport. ETOPS alternate airports are pre-approved adequate airports listed in the operator's specifications for potential diversions.

The regulation also defines the ETOPS Entry Point (where you cross the 60- or 180-minute threshold), Maximum Diversion Time (the longest authorized diversion under the operator's ETOPS approval), and ETOPS Qualified Person (maintenance personnel who've completed ETOPS training). Special polar areas have their own definitions for operational purposes.

*This is a plain-English summary for study only. The official 14 CFR text on this page is controlling — always read the current regulation and consult a CFI.*