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Landing Gear Speed  
User currently offlineChristian From Sweden, joined Oct 1999, 348 posts, RR: 2
Posted (9 years 4 months 3 days 21 hours ago) and read 3650 times:

What is the maximum speeds to lower the landing gear on the B-777 and the B-747-400.

I apologies if this have been discussed before, but I have search, and couldn't fin anything.

/Christian


If your pictures aren’t good enough, you’re not close enough
6 replies: All unread, jump to last
 
User currently offlinePhilSquares From , joined Dec 1969, posts, RR:
Reply 1, posted (9 years 4 months 3 days 20 hours ago) and read 3613 times:

The 400 is 270 KIAS/.82M for gear extension or retraction. 320/.82M for gear down.

User currently offline2H4 From United States of America, joined Oct 2004, 8955 posts, RR: 59
Reply 2, posted (9 years 4 months 3 days 9 hours ago) and read 3493 times:
AIRLINERS.NET CREW
DATABASE EDITOR

....From the internet, so I'm not guaranteeing accuracy here...

777-300:

VLO - Maximum Gear Operating Speed 270 KIAS/.82 Mach

VLE - Maximum Landing Gear Extension Speed 270 KIAS/.82 Mach


2H4





Intentionally Left Blank
User currently offlineTinPusher007 From United States of America, joined Feb 2005, 977 posts, RR: 1
Reply 3, posted (9 years 4 months 3 days 4 hours ago) and read 3460 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?



"Flying isn't inherently dangerous...but very unforgiving of carelessness, incapacity or neglect."
User currently offlinePhilSquares From , joined Dec 1969, posts, RR:
Reply 4, posted (9 years 4 months 3 days 3 hours ago) and read 3443 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.


User currently offlineChristian From Sweden, joined Oct 1999, 348 posts, RR: 2
Reply 5, posted (9 years 4 months 3 days 2 hours ago) and read 3434 times:

Thanks alot for the answers

/Christian



If your pictures aren’t good enough, you’re not close enough
User currently offlineLongHauler From Canada, joined Mar 2004, 4988 posts, RR: 42
Reply 6, posted (9 years 4 months 3 days 2 hours ago) and read 3457 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.



Never gonna grow up, never gonna slow down .... Barefoot Blue Jean Night
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