Another manufacturer, JAMCO America of Everett, Wash., said it replaced knobs on electrical switches pilots use to unlock the door on some Boeing 767s. The original version, located on an overhead panel that also holds other switches, resembled one that controls power for the plane's autopilot system. At least two pilots had mistakenly switched off power to their autopilots while trying to open cockpit doors in flight, creating confusion, according to NASA records.
Hmm, aren't the fuel pump switches identical to the logo lights etc,etc... Don't remember anyone ever getting those confused. The man in the hot seat really must have been having a bad day if he disconnected the autopilot by mistake
Anyway, the door are a definate improvement over the old wafer thin composite doors and serve their purpose as both a deterrent and making the occupants feel secure.
A lot of the reinforced doors unlock now with a rapid change in air pressure and just fly open - saves anyone getting twatted with a big lump of blow out panel
