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PIA 747 Undercarriage Failure Video Question.  
User currently offlineCumulus From United Kingdom, joined Aug 2006, 1402 posts, RR: 1
Posted (8 years 3 months 1 week 6 days 6 hours ago) and read 9510 times:

Been visiting FL350 and stumbled across this video of a PIA 747 which goes around at Manchester. ATC ask (about 6 times) what the reason is the go around, and the reply being "unsafe landing gear light". Why so late on the approach, are these checks not complete a lot further from t/d?

NB: Doesn't this Simon Lowe get all the action at Machester? He took the Thomsonfly birdstrike video too!

[Edited 2008-02-17 10:17:14]

What Goes Up Must Come Down, Hopefully In One Piece!
3 replies: All unread, jump to last
User currently offlineRscaife1682 From United States of America, joined Feb 2008, 339 posts, RR: 0
Reply 1, posted (8 years 3 months 1 week 6 days 6 hours ago) and read 9465 times:

Sounds like gear light might have been indicating green but the cocpit recieved an unsafe gear alarm as a/c desended below a certain altitude. A conflict between instruments would be my best guess


User currently offlineCubastar From United States of America, joined Nov 2006, 428 posts, RR: 5
Reply 2, posted (8 years 3 months 1 week 6 days 1 hour ago) and read 9056 times:

Quoting Cumulus (Thread starter):
Why so late on the approach, are these checks not complete a lot further from t/d?

On most approaches, the landing gear is not lowered until near or over the final approach fix inbound (usually the outer marker). At that time the final landing checklist is run. You would not get an unsafe gear light normally until the gear is lowered.

User currently offlineG4LASRamper From United States of America, joined Dec 2006, 171 posts, RR: 0
Reply 3, posted (8 years 3 months 1 week 5 days 15 hours ago) and read 8778 times:

Actually, you can get an unsafe gear or door indication at any time if things like proximity targets or sensors get knocked out of alignment. Even after the gear is verified as down and locked, it is possible to get unlock indications, again due to things like failure of sensors or switches in the gear system.

A go-around or overshoot would be prudent in such a case. Alternate means of lowering the gear and verifying lock could then be used.

"A pig that doesn't fly is just a pig." - Porco Rosso
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