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ASA popped out a F/A

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Wrong. Go back to school MELIT.

If it was a -700, the EMER DEPRESS would work because the single (1) outflow valve is electrically driven and reqires no vacuum pressure. The -200 requires 10th stage bleed air to drive the jet pump. You wouldn't have that with a low pressure air cart.

Wrong azzhole! EMER DEPRESS is electrically driven OPEN.
 
(10) In case of an emergency, the emergency depressurization switch, EMER
DEPRESS on the CABIN PRESS panel, is pushed to depressurize the aircraft.
When the switch is pushed, a command signal is sent to the cabin pressure
controllers. This puts CPCs in the dump mode and drives the torque motors on the
valves to open the valves. This drive signal is also available through passive
circuitry in the controller even if both controllers have failed. The cabin shall
depressurize to the limit control setting of 14 250±750 feet if the aircraft is above 15
000 feet. If the aircraft is below 15 000 feet, the cabin shall depressurize to ambient pressure amm 21-30-00​
 
Pressing the emerg depress switch (on a 200) is redundant and useless. The pressurization controllers are already sending a dump command to the outflow valves because you are on the ground. As had been said. no 10th pressure means no vacuum to pull the outflow valves open. Note placard by the external air connector (big yellow hose). It’s not the first time the service door has been blown open because all the doors were closed with low pressure external air connected.
As trip said;Disconnect ext. air let and it bleed off, or start APU if you have one.
 
(10) In case of an emergency, the emergency depressurization switch, EMER​

DEPRESS on the CABIN PRESS panel, is pushed to depressurize the aircraft.
When the switch is pushed, a command signal is sent to the cabin pressure
controllers. This puts CPCs in the dump mode and drives the torque motors on the
valves to open the valves. This drive signal is also available through passive
circuitry in the controller even if both controllers have failed. The cabin shall
depressurize to the limit control setting of 14 250±750 feet if the aircraft is above 15
000 feet. If the aircraft is below 15 000 feet, the cabin shall depressurize to ambient pressure amm 21-30-00

Your OUT!

posting manual information is unacceptable.

You either know it or make sh!t up on here to make your point valid.
 
Not to turn this into a systems class, but if you couldn't comunicate with the ground crew (because they are loading bags you didn't calculate for, and don't have a working headset anyway), what is there to do except open the door flap on the passenger boarding door? If you turn the packs off it won't help, or will it?


That big hole where the cargo door is supposed to be won't depressurize the airplane?
 

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