Code of Federal Regulations · Section
§ 121.509 — Flight Time Limitations: Four Pilot Crews: Airplanes
14 C.F.R. § 121.509
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(a) No certificate holder conducting supplemental operations may schedule a pilot—
(1) For flight deck duty in an airplane that has a crew of four pilots for more than eight hours in any 24 consecutive hours; or
(2) To be aloft in an airplane that has a crew of four pilots for more than 16 hours in any 24 consecutive hours.
(b) No pilot of an airplane that has a crew of four pilots may be on duty for more than 20 hours in any 24 consecutive hours.
Authorizing Statute
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Prohibition on personal use of electronic devices on flight deck49 U.S.C. § 44732
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General requirements49 U.S.C. § 44701
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Federal Aviation Administration49 U.S.C. § 106