Maistre Gracey
DIS Legend
- Joined
- Apr 23, 2002
- Messages
- 11,531
Let me explain a bit further...But the problem is that both do unreasonable things to cut costs. Flying old airplanes that depressurize during take off leading to the highest rate of aborted take offs? That is not reasonable in my book.
An airplane is pressurized from compressed air from the engines. There is an outflow valve that regulates just how much differential is in the cabin vs outside. There is also a safety valve that will guard in case that fails with over pressurization.
There are squat switches that tell the system that the airplane is on the ground, and will ensure both valves are open. The airplane will not pressurize on the ground. If it did, and you needed to open a door on the ground (even at the gate) the force of even a small amount of differential would cause an explosive reaction.
There is no such thing as pressurization before takeoff.
It is possible that after takeoff the airplane is not pressurizing properly. That said, I have not seen it, and not heard of it. It may have happened at some point (everything happens at some point), but it’s not a regular occurrence with us.
We likely have the youngest fleet of all major airlines.
Last edited: