What does the statement 'DOOR, DOOR, DOOR' mean?

What does the statement 'DOOR, DOOR, DOOR' mean?

• A. A command to lock all doors
• B. Warning of door malfunction
• C. As an added safety measure while the flight deck door is open, any crew member may shout the command if there is an attempt to breach the flight deck by a non-crew member; door must be closed and Level 4 actions followed
• D. Routine door check

Answer: (C)

This is a security signaling method used when the flight deck door is open and there is a possible breach by someone who isn’t crew. When a crew member perceives a threat, they may loudly shout the command three times: door, door, door. The purpose is to deliver an immediate, clear warning to everyone on board and to the pilots that a breach attempt is occurring. This warning prompts rapid action: the flight deck door is closed and secured, and the crew initiates Level 4 security procedures. It’s specifically about a security threat and not a routine door check or a malfunction warning.

This is a security signaling method used when the flight deck door is open and there is a possible breach by someone who isn’t crew. When a crew member perceives a threat, they may loudly shout the command three times: door, door, door. The purpose is to deliver an immediate, clear warning to everyone on board and to the pilots that a breach attempt is occurring. This warning prompts rapid action: the flight deck door is closed and secured, and the crew initiates Level 4 security procedures. It’s specifically about a security threat and not a routine door check or a malfunction warning.