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tangoecho
Topic Author
Posts: 123
Joined: Thu May 13, 2004 3:10 am

Landing Gear Retraction

Tue Feb 01, 2005 10:00 am

When an aircraft has just taken off and the gear is retracting, does the pilot apply the brakes??
Or does the wheels just keep spinning in the gear wells until they come to a stop themselves??

Just curious

Stu...
Contact Aberdeen tower on 118.10 G'day.
 
pilotaydin
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Joined: Tue Sep 07, 2004 12:30 am

RE: Landing Gear Retraction

Tue Feb 01, 2005 10:18 am

on some a/c it is a highly recommended procedure in order to stop any debris or pieces that are rotating at high speed to be inside the bay. I was told by older pilots that older planes needed this done to stop vibrations right after liftoff

hope this helps
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flyer737sw
Posts: 146
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RE: Landing Gear Retraction

Tue Feb 01, 2005 10:57 am

On 737's there are some sort of layered pads that slow down the spinning wheels while they retract into the gear bay...Not sure on the terminology but they are there...The pic below might speak for itself...The pads are on the perimeter of the opening into the wheel well...Hope this helps...


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Kevin
 
DeskPilot
Posts: 704
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RE: Landing Gear Retraction

Tue Feb 01, 2005 11:10 am

".. sort of layered pads that slow down the spinning wheels .."

I thought that was to form a seal with the wheels, given there's no main gear doors on type 737 ? Can someone confirm ?
By the way, is there anyone on board who knows how to fly a plane?
 
SlamClick
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RE: Landing Gear Retraction

Tue Feb 01, 2005 11:13 am

Most large complex airplanes, like airliners this function is automatic. As the pressure is ported to the Retract side of the hydraulic cylinder, for example, the return fluid from the Extend side may be used to apply the wheel brakes. Another issue is increased diameter due to high rotational speed.

The nosewheels usually just have belt type snubbers to stop the tires.
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CCA
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RE: Landing Gear Retraction

Tue Feb 01, 2005 12:18 pm

DeskPilot, you are correct.

CCA
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HAWK21M
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Joined: Fri Jan 05, 2001 10:05 pm

RE: Landing Gear Retraction

Tue Feb 01, 2005 5:46 pm

On 737's there are some sort of layered pads that slow down the spinning wheels while they retract into the gear bay...Not sure on the terminology but they are there...The pic below might speak for itself...The pads are on the perimeter of the opening into the wheel well...Hope this helps...

Thats Totally Incorrect,The Wheel Well seal in the MWW only prevents Airflow into the Wheel well After gear retraction to assist in Noise reduction due to Airflow mvmt.
The Main Gears when retracted are Autoretractbraked thru the Brake Metering valve that ports Hyd Brake flud to the Main wheel brakes when Gears are retracted.The Wheels are stationary when retracted.
On the NWW for the Nose wheels to stop rotation there are Snubber pads that rub against the Nose wheel tire to Stop its rotation.
regds
MEL
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tangoecho
Topic Author
Posts: 123
Joined: Thu May 13, 2004 3:10 am

RE: Landing Gear Retraction

Tue Feb 01, 2005 7:31 pm

Thanks for your replies guys..

It's just one of those things I wonder about.

Cheers  Big thumbs up

Stu...
Contact Aberdeen tower on 118.10 G'day.
 
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BALandorLivery
Posts: 317
Joined: Mon Jan 17, 2005 7:54 pm

RE: Landing Gear Retraction

Wed Feb 02, 2005 2:12 am

Some a/c apply brakes automatically when the wheels are selected up.

I know that concorde did.

The reason is, and I quote from a concorde engineer:

"to stop any gyroscopic effects from the wheels spinning fast when they enter the wheel well"

Hope this helped.

Regds.

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