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As already stated, quite easy to lose massive amounts of height in short periods of time in a "controlled" manner. I've done quite a few emergency descents in the PC-12 -
1. Power to flight idle
2. Oxygen masks on, undercarriage down
3. 20-30 degree nose down
4. Dont exceed max Mach or IAS whatever is the lower.
5. Approx 4000 feet per minute descent
6. Recover from dive.
Recovery completed by 10,000 feet back to normal descent! It sounds pretty full on as the media makes out, but in reality is quite a smooth stress free manoeuvre, maybe a little negative G and some positive G on the pull out.
I would say maybe 2000-3000 feet for a 747 to pull out.
Oh btw i loved it when the news reported that the cabin "de-pressurised without warning".....
"Ladies and Gentleman, this is your cabin speaking, I'm about to blow my seal and lose all that wonderful air pressure thats keeping you alive. Please, don your oxygen masks when they fall from the ceiling, strap in, and enjoy the drop. Thankyou for flying Plummet Air"
oh dear.... im rambling again....
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