united airbus brake fans?
10-20-2014, 07:33 AM
#5
Gets Weekends Off
Joined APC: Nov 2008
Position: Airbus 320 Right Seat
Posts: 1,440
united airbus brake fans?
We have them at JetBlue and I feel we put a lot of emphasis on them .. More than needed these things have been flying for years without them. Also I heard we take a pretty good size weight penalty cause of them... Delta doesn't have them either .
10-20-2014, 07:39 AM
#6
Gets Weekends Off
Joined APC: May 2008
Posts: 617
I understand that there is a lot of weight on 4 wheel/tire assemblies which naturally heats up the brakes, but how is it any different from a 737? Particularly one of the bigger 737s like a -900ER? I'm just curious why Boeing doesn't have this option.
10-20-2014, 07:43 AM
#7
Moderate Moderator
Joined APC: Mar 2008
Position: Curator at Static Display
Posts: 5,681
When I flew the Bus, I was told it was more about the weight penalty than cost (2000 lbs sound right?).
Normally NBD. But one Autumn afternoon, did an ORD-Indy-ORD turn. Brakes were pretty warm at the gate. For reasons I've forgotten, we had to taxi almost two miles to takeoff.
The brakes were just under the limit when we rolled. Capt kept the gear down for about 30 seconds after liftoff. Gear up, checked them, starting to cool off. Just as we level off, BONG! ECAM for hot brakes.
Slowed down and dropped the gear. We were about FL200. I figured in a 200+ kt slipstream that was below freezing, a minute or two would do it.
Nope. Had the gear down all the way to Chicago. I was amazed.
Normally NBD. But one Autumn afternoon, did an ORD-Indy-ORD turn. Brakes were pretty warm at the gate. For reasons I've forgotten, we had to taxi almost two miles to takeoff.
The brakes were just under the limit when we rolled. Capt kept the gear down for about 30 seconds after liftoff. Gear up, checked them, starting to cool off. Just as we level off, BONG! ECAM for hot brakes.
Slowed down and dropped the gear. We were about FL200. I figured in a 200+ kt slipstream that was below freezing, a minute or two would do it.
Nope. Had the gear down all the way to Chicago. I was amazed.
10-20-2014, 08:57 AM
#8
Prime Minister/Moderator
Joined APC: Jan 2006
Position: Engines Turn Or People Swim
Posts: 39,277
The weight/cost penalty is not worth it unless you're constantly doing quick turns at airports which need a lot of braking action. Home Depot fans add zero weight and cost about 1/1000 of what an installed cooling system does.
10-20-2014, 09:50 AM
#10
Gets Weekends Off
Joined APC: Jan 2014
Position: A320 Left
Posts: 715
Originally Posted by rickair7777
The weight/cost penalty is not worth it unless you're constantly doing quick turns at airports which need a lot of braking action. Home Depot fans add zero weight and cost about 1/1000 of what an installed cooling system does.
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