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Adequate Airport (ETOPS)

Adequate Airport. An airport that an airplane operator may list with approval from the Federal Aviation Administration (FAA) because that airport meets the landing limitations of part 121,  121.197 and is either, an airport that meets the requirements of 14 CFR part 139 subpart D, excluding those that apply to aircraft rescue and firefighting service, or a military airport that is active and operational.

 Airports without specific part 139 approval (i.e., outside FAA jurisdiction), may be considered adequate provided that they are determined to meet the equivalent standards and intent of part 139 subpart D.

Source FAA AC 120-42B

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