Be realistic
Come on. Best realistic and be an engineering minded.
In the case of emergency. The best and easy way is exactly what ahmed 88 has stated or IFixPlanes has said " ............ turn off and disconnect A/c unit, open avionics vent inlet/outlet ..................."
Where to find a 3/8 inch allen key to open the drain valves. Push open the air conditioning check valve (flap valve type) would probably chop off your fingers with Delta pressure or a mouthful of dust.
Open the toilet drain??????? on a vacuum system.
Open the vent door on a door.???? Most likely you would be knocked into the air when the door is swung open with some different pressure. Even a 0.01 psi on a door of 70" x 40" would give a total 28 lbs of force.
It takes less than 20 second to wind the small handle of the avionic ventilation inlet/outlet vent valves fully open and it is reachable without a ladder.
The following is from Airbus notes:-
PAX-DOOR OPERATION
Precautions / Warnings
WARNING : Do not operate the door control handles inside or outsite if the
red cabin pressure warning light in the door window is flashing :
In that case there is a cabin overpressure of more than 2.5 mb
( 0.037 psig )
Residual pressure could cause the door to open with a sudden
force and injure persons and / or damage the aircraft.
Do not go near or open pressure sealed doors when the aircraft
is pressurized. If you do you will cause explosive decompression,
kill or injury to persons and cause damage to the aircraft.
Do not open the passenger / crew door if the wind speed is more
than 65 knots.
Last edited by Kuchan; 20th Jun 2011 at 18:15.