KELPkid
Posts: 5247
Joined: Wed Nov 02, 2005 5:33 am

RE: Opening Gear Doors To Cool The Brakes?

Thu Oct 01, 2015 8:17 pm

Quoting francoflier (Reply 47):
Nose wheels are not braked before retraction as they remain at the same angle when they go up, which avoids having to install some sort of braking device there. However they are often 'snubbed' by friction pads once they reach the stowed position in the gear bay to avoid prolonged vibrations and noises after take-off.

Sometimes, if you're in one of the front rows, you can hear the snubbers doing their job right after gear retraction  
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HAWK21M
Posts: 30050
Joined: Fri Jan 05, 2001 10:05 pm

RE: Opening Gear Doors To Cool The Brakes?

Sat Oct 24, 2015 9:30 am

Quoting Max Q (Reply 36):
Yes, the B727.


It is the procedure for a wheel well fire.
Quoting Max Q (Reply 41):
Quoting Max Q (Reply 43):
So yes, the procedure details how to extend the gear and leave the gear doors open in an attempt to extinguish the fire, my memories not what it used to be.

Interesting.....Is there an Alt door opening procedutre on the type which does not require the crew intervention if activated to only open the door & not extend the gear.
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LimaFoxTango
Posts: 912
Joined: Wed Jun 16, 2004 11:33 pm

RE: Opening Gear Doors To Cool The Brakes?

Sat Oct 24, 2015 10:26 pm

Quoting Max Q (Reply 27):
I agree that this Pilot misspoke when he said he was going to open the gear doors but this is possible in flight.

Firstly, your assuming what the OP said was actually what the pilot said. Secondly, even if he did say that, he was probably trying to use layman terms to explain what he was going to do. I wouldn't be so quick to doubt the actions or words of the pilot. After all, he's the trained professional. I'm sure he knows his airplane.
You are said to be a good pilot when your take-off's equal your landings.
 
BravoOne
Posts: 3678
Joined: Fri Apr 12, 2013 2:27 pm

RE: Opening Gear Doors To Cool The Brakes?

Mon Oct 26, 2015 10:31 am

Coming to this thread a little late but other than the 727 as Max Q has mentioned and the 707 I can't think of another airplane that I have flown that has that capability? Not likely that the 1st poster was on a 727 these days.
Also just for grins here is partial bulletin from Boeing regarding hot brakes and wheel well fires.

There is a common misconception amongst crews that wheel well
fire warnings are caused solely by overheated brakes. Overheated
brakes can contribute to wheel well fires if they become hot
enough to ignite the tires, hydraulic fluid or other flammable
substances. However, our engineering analysis of the fire
detection system indicates that the brakes alone can not generate
enough heat to trigger the fire detector system.

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