14 CFR · Part 121
14 CFR § 121.584
Requirement to view the area outside the flightdeck door.
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:
A person authorized to be on the flightdeck uses an approved audio procedure and an approved visual device to verify that:
The area outside the flightdeck door is secure, and;
If someone outside the flightdeck is seeking to have the flightdeck door opened, that person is not under duress, and;
If the airplane is in flight, any installed physical secondary barrier (IPSB) required by § 121.313(l) has been deployed; and
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.
Referenced By
Information for Operators (InFO) (2)
Documents that cite this section, found in their catalog metadata or text. Listed by date, not by significance.
Regulations Referenced
Reflects the eCFR edition current as of September 29, 2026. Retrieved from ecfr.gov on October 16, 2026.
Primary Source