JohnJ
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A319/A320 "Hubcaps"

Wed Mar 24, 2004 7:01 am

After viewing several photos of Airbus narrowbodies side by side, it occurred to me that some appear to have some type of hubcap/wheel cover on their main gear wheels, while others don't. Here's what I'm talking about - the Northwest A320 seems to be lacking these wheel covers, while the US Airways A319 has them:


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Photo © John E. Jauchler




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Photo © John E. Jauchler



Is this an airline-specified option, or simply something that was added to later versions of these types?
 
buckfifty
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Joined: Tue Oct 16, 2001 4:05 pm

RE: A319/A320 "Hubcaps"

Wed Mar 24, 2004 7:38 am

It is possible that the US 319 is equipped with brake fans. Usually, that's what they look like, but then, it's hard to tell still unless if I can get a closer look.
 
LHSebi
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Joined: Wed Jan 07, 2004 4:24 am

RE: A319/A320 "Hubcaps"

Wed Mar 24, 2004 8:45 am

Can you see the pilots having a chit-chat?
"So Bob, how's your plane doing?"
"Good, good. Got the 56s on tonight, looking good!"  Big thumbs up

Sebastian
I guess that's what happens in the end, you start thinking about the beginning.
 
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Bruce
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RE: A319/A320 "Hubcaps"

Wed Mar 24, 2004 11:49 am

ahhhhh speaking of Brake Fans, this is just the place to plug my shot. A real pair of Airbus brake fans. Sorry its on the other site; Screeners here thought it was Badmotiv

http://www.jetphotos.net/viewphoto.php?id=139217

bruce
Bruce Leibowitz - Jackson, MS (KJAN) - Canon 50D/100-400L IS lens
 
JohnJ
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RE: A319/A320 "Hubcaps"

Wed Mar 24, 2004 12:43 pm

Interesting. Brake fans could very well be what those are. They look just like the image Bruce posted. Wonder why some airlines go for them and others don't? I was just looking at an America West A320 picture I posted this morning and it appears to have them, too.

When you say brake fan, this is what comes to mind for me - I took the Continental Micronesia Island Hopper back in 2000, and this is what they use to cool the brakes after landing on some of the very short runways on the island route:

 
dc10hound
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Joined: Fri Dec 15, 2000 4:18 pm

RE: A319/A320 "Hubcaps"

Wed Mar 24, 2004 1:32 pm

And to go along with the link to the photo of the A310 above (The system is essentially identical on the A310 and A300):

AAL A300-600R AMM 32-48-00-0

BRAKE COOLING - DESCRIPTION AND OPERATION

1. General

This equipment is optional.

The equipment enables high speed cooling of the brakes and therefore a
reduction in the aircraft turn around time in the event of short flights with high energy braking.

2. Mechanical Installation

There is one fan per main gear wheel.

Each fan is comprised of : -
- a motor
- an impeller
- a shroud comprising a debris guard

The fan motor is housed in the wheel axle, held in position by means of an adaptor assy. The motor drives the impeller which creates a flow of air from the heat pack to the exterior through the debris guard. The tachometer drive shaft passes through the hollow fan motor shaft. The tachometer is driven by the shroud.

Responsibility for the fans lies with the brake manufacturer. (??????.....)

For both Messier and Bendix the fans are manufactured by Technofan. Only the fan shroud differs.

3. Electrical Installation

The fan motor is of the three-phase type. The two motors in each twin-wheel axle have a common supply. With the landing gear downlocked, the fans are started by pressing the illuminated pushbutton switch 30GW. The fans must be started as soon as the pushbutton switch HOT legend comes on.

Illumination of the HOT legend indicates that at least one brake has exceeded the brake overheat threshold.
"Eagles soar. But weasels never get sucked into jet intakes.."
 
buckfifty
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RE: A319/A320 "Hubcaps"

Wed Mar 24, 2004 7:09 pm

They look just like the image Bruce posted. Wonder why some airlines go for them and others don't?

They are just extra weight and cost for most airlines. Some may specify them because of operational reasons for certain airfields they fly into.

After long taxy times, brakes can get hot, and departures must be delayed to let the brakes cool down. However, that does not happen too often, except at airports where taxy times are long due to regular line ups or long distances. Adding brake fans may alleviate this problem somewhat, but the added weight will impose a weight penalty which is constant for all flights.

Cost benefit analysis, anyone?
 
flyingbronco05
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RE: A319/A320 "Hubcaps"

Wed Mar 24, 2004 11:30 pm

Can you see the pilots having a chit-chat?
"So Bob, how's your plane doing?"
"Good, good. Got the 56s on tonight, looking good!"


Huh?  Confused

FB05
Never Trust Your Fuel Gauge
 
JohnJ
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RE: A319/A320 "Hubcaps"

Thu Mar 25, 2004 12:00 am

Well, this looks like another thing to keep me on my toes when spotting - I'll definitely be paying more attention to this in the future.

I took a quick spin through the database to see which US A320 operators use these devices. Here's what I found:

With fans:

America West:
http://www.airliners.net/open.file/533049/L/

US Airways:
http://www.airliners.net/open.file/525028/L/

Without fans:

United:
http://www.airliners.net/open.file/504864/L/

Frontier:
http://www.airliners.net/open.file/536362/L/

Northwest:
http://www.airliners.net/open.file/539239/L/

USA 3000:
http://www.airliners.net/open.file/517752/L/

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