TinPusher007 From United States of America, joined Feb 2005, 963 posts, RR: 2 Reply 3, posted (8 years 4 days 23 hours ago) and read 2400 times:
Quoting PhilSquares (Reply 1): The 400 is 270 KIAS/.82M for gear extension or retraction. 320/.82M for gear down.
Why is there a second speed for gear down? If you extend the gear, isn't it down? Can this really be done at Mach .82? Or should I focus more on the Indicated Airspeed instead of the Mach number?
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PhilSquares From , joined Dec 1969, posts, RR: Reply 4, posted (8 years 4 days 21 hours ago) and read 2383 times:
If you are doing an emergency descent from 370 or so, your mach will be .85-.86 while your indicated will be around 240 or so. In that case, you have to slow to .82 or less.
At lower altitudes, the indicated speed becomes a factor.
LongHauler From Canada, joined Mar 2004, 4281 posts, RR: 36 Reply 6, posted (8 years 4 days 21 hours ago) and read 2397 times:
Quoting TinPusher007 (Reply 3): Why is there a second speed for gear down? If you extend the gear, isn't it down?
The gear operating speeds, (extension and retraction) are always less then the gear extended (down and locked) speed. This is due to the landing gear door restrictions as the doors open, gear extends or retracts, then close again. Once the gear doors are closed, you may then fly at a higher speed, with the gear extended.
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