StacksVerified U.S. regulatory reference

14 CFR §121.584

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
From the time the airplane moves in order to initiate a flight segment through the end of that flight segment, no person may unlock or open the flightdeck door unless:
  1. (a)A person authorized to be on the flightdeck uses an approved audio procedure and an approved visual device to verify that:
    1. (1)The area outside the flightdeck door is secure, and;
    2. (2)If someone outside the flightdeck is seeking to have the flightdeck door opened, that person is not under duress, and;
    3. (3)If the airplane is in flight, any installed physical secondary barrier (IPSB) required by § 121.313(l) has been deployed; and
  2. (b)After the requirements of paragraph (a) of this section have been satisfactorily accomplished, the crewmember in charge on the flightdeck authorizes the door to be unlocked and open.