highflyer9790
Posts: 1189
Joined: Thu Jul 07, 2005 1:21 am

Did They Forget To Put The Gear Up?

Wed Jan 04, 2006 1:05 am

While browsing new videos at flightlevel350.com, I came across this one. The gear is not retracted, even well after takeoff. Maybe they were waiting to clear a specific altitude? they forgot? special procedure for a freighter? i know 747 tend to leave gear down a tad longer than other aircraft, but this is quite unusual. Comments appriciated!

http://www.flightlevel350.com/viewer.php?id=5122

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aa61hvy
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RE: Did They Forget To Put The Gear Up?

Wed Jan 04, 2006 1:24 am

Nah, I think alot of times they do that to 'clean off' the gear. I've seen a DC-10 keep it up until about 5,000 feet.
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MD88Captain
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RE: Did They Forget To Put The Gear Up?

Wed Jan 04, 2006 1:26 am

Often a delay in gear retraction is used to cool the brakes and tires after a prolonged taxi on heavy weight aircraft.
 
Eirjet
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RE: Did They Forget To Put The Gear Up?

Wed Jan 04, 2006 1:26 am

I think someone posted a similiar question some time ago about a different aircraft.

In that particular instance it was explained that in some cases pilots retract the gear late so as to let any tire dust be 'brushed' off by the air. I think someone also mentioned that leaving the gear extracted while climbing (for a short period) helps cool the wheels.

Some-one with some technical knowledge may provide a better explanation.

Eirjet
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speedbird128
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RE: Did They Forget To Put The Gear Up?

Wed Jan 04, 2006 5:53 am

Quoting MD88Captain (Reply 2):
Often a delay in gear retraction is used to cool the brakes and tires after a prolonged taxi on heavy weight aircraft.

Cooling is a highly likely reason.

A few months ago, during our summer season where the day-time temperatures hover just under 50C, I had a Syrian B74S depart, and they had still not retracted the gear when they were through 8000' and I had lost sight of them... I informed our radar sector, and they queried the pilot if there was a problem, and he said no, they had delayed retraction for cooling purposes...

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Matt72033
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RE: Did They Forget To Put The Gear Up?

Wed Jan 04, 2006 5:56 am

common after a long taxi period, brakes get a little warm the airflow over them cools them off a bit!
 
highflyer9790
Posts: 1189
Joined: Thu Jul 07, 2005 1:21 am

RE: Did They Forget To Put The Gear Up?

Thu Jan 05, 2006 11:19 am

thankx alot! i can always count on a.nutters!
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fr8mech
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RE: Did They Forget To Put The Gear Up?

Thu Jan 05, 2006 11:35 am

There is also a chance tat a brake was deferred. The crew must leave the gear down in order to allow the wheel to come to a stop.
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474218
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RE: Did They Forget To Put The Gear Up?

Thu Jan 05, 2006 12:09 pm

Quoting Fr8mech (Reply 7):
There is also a chance tat a brake was deferred. The crew must leave the gear down in order to allow the wheel to come to a stop.

When the gear handle is selected to the up position, hydraulic pressure is routed to brakes, which stops the wheel rotation.
 
Matt72033
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RE: Did They Forget To Put The Gear Up?

Thu Jan 05, 2006 4:17 pm

Quoting Fr8mech (Reply 7):
There is also a chance tat a brake was deferred. The crew must leave the gear down in order to allow the wheel to come to a stop.



Quoting 474218 (Reply 8):
When the gear handle is selected to the up position, hydraulic pressure is routed to brakes, which stops the wheel rotation.

not if theres a U/S brake unit!
 
moparman
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RE: Did They Forget To Put The Gear Up?

Thu Jan 05, 2006 4:34 pm

Just out of curiosity:

I'm not a pilot, but have a question to the pilots here. That landing gear would have to cause immense drag. Is it possible that the pilot forgets to raise the landing gear that so much drag is lost that the aircraft stalls and crashed because it cannot gain/maintain airspeed?
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gunsontheroof
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RE: Did They Forget To Put The Gear Up?

Thu Jan 05, 2006 4:35 pm

On climbout from AMS enroute to SEA (NW A333) last summer, the captain of my flight actually put the gear back down to cool it off. It was a full flight, and we'd had a long taxi to 36L (not that there's a short one).
 
Olympus69
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Joined: Sat Jun 15, 2002 11:21 pm

RE: Did They Forget To Put The Gear Up?

Fri Jan 06, 2006 12:24 am

Quoting Moparman (Reply 10):
Is it possible that the pilot forgets to raise the landing gear that so much drag is lost that the aircraft stalls and crashed because it cannot gain/maintain airspeed?

No.