Airplane General - Flight Deck Door

Amendment: Both common types of Flight Deck Security Door now included.

Flight Deck Door Switch.

The flight deck door opens into the cabin. There is a step between the flight deck and the cabin.

An electric lock latch mechanism, controlled by the flight deck door switch, allows the flight deck door to be locked. The door can be opened at any time from the flight deck side. When the door is locked, a key is required to open the door from the passenger cabin side. The door unlocks automatically with the loss of electric power.

A break-away feature allows the door to be forced open in either direction for emergency access to or evacuation from the flight deck.

CAUTION: Forcing the door open into the passenger cabin causes permanent damage.

Entry Keypad

The flight deck security door meets requirements for resistance to ballistic penetration and intruder entrance. The door opens into the passenger cabin. There is a step between the flight deck and the cabin. When closed, the door locks when electrical power is available and unlocks when electrical power is removed. A viewing lens in the door allows observation of the passenger cabin. The door can be manually opened from the flight deck by turning the door handle.

Manual Dead-bolt

The door incorporates a deadbolt with a key lock. Rotating both concentric deadbolt levers to the locked (horizontal) position - leaving the green dots visible - prevents the passenger cabin key from unlocking the door. Rotating only the forward deadbolt lever to locked allows the key to unlock the door.

To unlock the dead-bolt and door, turn the split lever clockwise and ensure the red dots are visible.

The flight deck access system consists of an emergency access panel, chime module, Door Lock selector, two indicator lights, and an Access System switch. The emergency access panel includes a six button keypad for entering the numeric access code along with red, amber, and green lights. The red light illuminates to indicate the door is locked. When the correct emergency access code is entered, the amber light illuminates. The green light illuminates to indicate the door is unlocked.

Two indicator lights and a three position Door Lock selector are located on the overhead panel. Illumination of the amber LOCK FAIL light indicates the door lock has failed or the Access System switch is in the OFF position.

Emergency Access Request

The emergency access code is used to gain access to the flight deck in case of pilot incapacitation. Annunciation of a flight deck chime and illumination of the amber AUTO UNLK light indicates the correct emergency access code has been entered and the door is programmed to unlock after a time delay.

Cockpit Door Switch Panel

Deny Entry

Selecting the DENY position on the Door Lock selector denies entry, illuminates the red LED and prevents further keypad entry for several minutes or until the door lock selector is moved to UNLKD.

Allow Entry

To allow entry, the selector is turned to the UNLKD position which unlocks the door while held in that position.

Emergency Access Request - Incapacitation

If the emergency access code is entered and the pilot takes no action, the door unlocks after expiration of the time delay. Before the door unlocks, the chime sounds continuously and the AUTO UNLK light flashes.

AMM During the time delay, the amber light illuminates on the access panel. The chime/buzzer will also sound after one-third and after two-thirds of the time delay. At the end of the time delay, the green light on the access panel illuminates for 5 seconds to indicate the door is unlocked, after which the door will automatically lock.

Normal Entry

By pressing "1" then "ENT" keys on the emergency access panel, the flight deck chime/buzzer will sound (if programmed) and the amber light will illuminate on the access panel. When UNLKD is selected, the green light illuminates on the access panel.

The door incorporates two pressure sensors that unlock the decompression panels in the event of flight deck depressurization. These panels open to equalize pressure in the event of cabin depressurization at a pre-determined value. The decompression panels have manual release pins. Pulling the pins frees the panels allowing egress in the event the door is jammed.

AMM Should a panel inadvertently detach if the door is slammed shut, replace the panel in the pressure switch first, then insert the release pins.

CAUTION: The top panel is hinged at the bottom of the panel and will fall forwards into the flight deck, and could strike personnel on the jump-seat.

Should the cabin lose pressurization, there is sufficient space for air in the flight deck to escape around the doorframe into the cabin.

Cockpit Door Cutoff Switch

CAUTION: Do not slam the door shut excessively as the force can exceed the limits of the pressure relief latches and cause inadvertent opening of the decompression panels.

Door Chime Module

The Door Chime Module situated on the doorframe inside the flight deck contains the door program controls, timers and chime units. Maintenance action is required to adjust any timers, chime or tone volumes.

A red guarded cut-off switch when activated (toggle up) disengages the lock solenoid and illuminates the LOCK FAIL light. The door can be latched closed but can not be locked electronically.