Flight deck door opening procedures while inflight.
Flight deck door code.
Since 9 11 it is a requirement to keep flight deck doors locked just prior to engine start until engines have been shutdown.
Security of the flight deck when opening the flight deck door during flight.
Most airlines have keypad systems to allow entry into the flight deck if the flight crew become incapacitated however flight crew will always have the option to deny access.
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A simple and cost effective way to bolster the last line of flight deck defense us airlines installed cockpit access codes following the september 2001 terrorist attacks when hijackers.
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One method employs a combination of procedures using crewmembers to monitor the area and or aircraft equipment such as galley carts to block access to the flight deck during the door transition.
Whereas the armoured and locked flight deck door was extremely successful in mitigating the risk of hijack and preventing a repeat of a 9 11 type event the accident of the germanwings flight 4u9525 highlighted the potential for a pilot to exclude other crew members from the flight deck and interfere with the safe progress of the flight.
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Flight deck doors while providing security for the crew are still open to the rest of the aircraft thru a vent panel system.
United continental holdings alerted pilots that access codes to cockpit doors were accidentally posted on a public website by a flight attendant reports the wall street journal.
There are sliding panels built into the door that allow for pressure to equalize on both sides.
When closed and secured from the cockpit the only way for the door to fly open would be a deformation of the airframe.
This info serves to emphasize the importance of following flight deck door opening procedures while inflight for the safety and security of title 14 of the code of federal regulations 14 cfr part 121 operations.