Flow2706 wrote:Doors on pressurized airplanes can't be opened in flight due to the differential pressure. During cruise flight the differential pressure between the cabin and the atmosphere is around 8-9PSI (depending on the aircraft type and altitude). The doors move slightly inwards before opening outwards so you would have to move the door against this pressure and this is not possible. However there is a possibility that the aircraft doors could be opened during takeoff/landing when there is no or only a minor differential pressure (sometimes the air conditioning packs are switched off for takeoff, as this will reduce the wear on the engines and thereby reduce maintenance costs - in this case there is no differential pressure until the packs are switched back on, typically at around 1000-2000ft).
guy739 wrote:From my understanding as the aircraft pressurizes, it causes the frame to expand. As it expands it essentially secures the door within the locking mechanisms.
n92r03 wrote:On the L-1011, I seem to remember the door sliding vertical, up into the ceiling. Am I way off base here or was that the case? Last flight on one was ~1995, DL, LAX-SAN.
Starlionblue wrote:Larger ones on widebodies tend to be outward opening, non-plug type, bulk cargo doors are typically plug
Tristarsteve wrote:A little anecdote about door pressure.
Our overnight parked A320 is left on a jetty for the morning departure and has heating /cooling hose connected. It delivers air from the terminal at 22degC at low pressure.
It often happened that the morning departure flight crew arrived at the airport, with the ramp agent, to find the door closed, and the aircraft on ground service. They then opened the door themselves (the ramp agent was not trained in this)
The day in question was very cold, and the crew the previous evening had closed the outflow valve manually before leaving the aircraft to keep it warm.
When the captain tried to open the door in the morning, the handle stopped half way up. Rubbish he said, the packs are not running there is a fault here. He heaved on the handle and the door opened. The first officer caught him as he flew across the airbridge.
I tried this myself the next night, and found that I could not open the door. The air conditioning hose provided enough pressure to keep the door closed.
To stop it happening again, the loading supervisor goes out to the aircraft earlier and cracks open the fwd freight hold door to relieve any pressure.
Horstroad wrote:Some cargo doors are outward opening plug type. The aft small cargo door (70") on the B777 for example is an outward opening plug type door (and I'm pretty sure it's the same on the B767).
The forward large cargo door (106") and aft large cargo door (106", if installed) are non-plug type doors.
The aft cargo door on the MD11 (what other manufacturers would call the bulk cargo door) is non-plug type. McD always had to do it differently
StereoTechque wrote:Any other term for non-plug type doors.? Never come across any apart from conventional.
Horstroad wrote:StereoTechque wrote:Any other term for non-plug type doors.? Never come across any apart from conventional.
That's the official Boeing terminology. McD doesn't say anything about plug type or non-plug type in the description and operation part of the AMM. I don't know how Airbus calls it.
FlyHossD wrote:A pressurized airplane on the ground is a tough nut to crack, too. This thread reminded me of this "bad day at the office":
https://app.ntsb.gov/pdfgenerator/Repor ... L&IType=IA
GalaxyFlyer wrote:Pressure door by Lockheed’s term.
The Gulfstream 150 door that killed the captain in Finland who was opening the door from the outside was caused by using APU to warm the cabin but not checking the outflow valve was fully open. In 2005 a US carrier F/A was injured in similar fashion. All doors were closed and external AC connected partially pressurizing the cabin. Galley door was opened and she was ejected. Third incident was a C-17 Loadmaster who opened the door before fully depressurized. One thing in common, all ground events with relatively low differential applied.
fr8mech wrote:n92r03 wrote:On the L-1011, I seem to remember the door sliding vertical, up into the ceiling. Am I way off base here or was that the case? Last flight on one was ~1995, DL, LAX-SAN.
Yes, as they do on the DC10/MD11 & the B767. The doors still move in before they move up.
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