" For the ignorami DOOR is used in many more modern /US aircraft instead of PANEL"
Thank you. I am always grateful to have my education expanded.....despite the minor detail of having worked on 757's for, say, 12 years....give or take....with a Hyd system px of 3000psi. And yourself, other than as pax ?
Compressed air ?.....erm, no.
Compressed N2...yes....I wonder why an inert gas would be preferred.....and please, don't try and quote bleed air as an example of compressed air.
Emergency u/c lowering.....blow down on the FJ world, for obvious reasons, but something called.....gravity...... does the job just as well.
I must though, have missed something rather unique with regard to the location of the outflow valve(s).
Are you thinking of making engineering a career....or just a passing hobby ?
Quite why the panel took off with the a/c, and departed to do it's own thing thereafter, has not yet been answered however. As yet.