§ 121.509 - Flight time limitations: Four pilot crews: airplanes.

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No certificate holder conducting supplemental operations may schedule a pilot—

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

To be aloft in an airplane that has a crew of four pilots for more than 16 hours in any 24 consecutive hours.

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.