NorthstarBoy
Topic Author
Posts: 1416
Joined: Tue Jun 07, 2005 12:53 pm

A346 Nosewheel Question

Sat Dec 13, 2008 11:49 am

A week or so ago, i went to Germany on LH, estimated departure time was 615pm as our A346 (D-AIHF) was arriving late into Denver from Frankfurt. As departure time got close, and i was milling around the gate area, with no airplane in sight, i see an airport vehicle, lights flashing come up, the driver spoke to a couple of rampers who then jumped in a tug and followed the airport vehicle across the tarmac, then the other shoe came down, as the gate agents announced that the aircraft had landed but was having to be towed from the runway to the gate due to the nosewheel steering failing. We were further informed by the crew, once we boarded at around 9pm, that condensation in the nosewheel had caused the failure, so here's the question, does the A346 not have the standard steering wheel as other aircraft do? or does the fly by wire nature of the plane mean that the nose gear is steered with the sidestick controller? How would condensation affect the nose wheel steering?

Any ideas?
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musapapaya
Posts: 990
Joined: Mon Apr 05, 2004 10:02 am

RE: A346 Nosewheel Question

Sat Dec 13, 2008 4:30 pm

It seems like they lost hydralics? I am not entirely sure on the Airbus but I think hydraulic failure can cause this problem.......
Lufthansa Group of Airlines
 
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HAWK21M
Posts: 29867
Joined: Fri Jan 05, 2001 10:05 pm

RE: A346 Nosewheel Question

Sat Dec 13, 2008 5:47 pm

Sounds like a Hydraulic leak to the steering system.
regds
MEL
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sgtusmc96
Posts: 37
Joined: Wed Apr 04, 2007 3:11 pm

RE: A346 Nosewheel Question

Sat Dec 13, 2008 6:02 pm

Or a BSCU (brake steering control unit) Went bad.
 
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IFixPlanes
Posts: 244
Joined: Sun Feb 20, 2005 11:34 pm

RE: A346 Nosewheel Question

Sun Dec 14, 2008 6:43 am



Quoting NorthstarBoy (Thread starter):
... How would condensation affect the nose wheel steering?

Nose wheel steering is controlled by electric via the hand wheel (not the side stick) and the BSCU.
Condensation / moisture and electric can lead to trouble some time  Wink
never tell an engineer he is wrong ;-)
 
VAAengineer
Posts: 63
Joined: Wed Jul 18, 2007 5:53 am

RE: A346 Nosewheel Question

Tue Dec 23, 2008 5:31 am

On the A346 there are 2 systems that can steer both green and yellow will do it. Sometimes when the pilot steers the aircraft too fast and the GS speed is low the BSCU will cancel his command and deactivate the nose wheel steering, it can be reset with a test but most likely a tow is the fastest way to get the airplane out of the way
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Horstroad
Posts: 362
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RE: A346 Nosewheel Question

Sun Jun 26, 2011 11:04 am

the A380 also had quite some trouble with nose gear steering. there are sensors on the NLG reporting the position of the gear, wheather it is on the ground or not etc. moisture can cause these sensors to fail. if the computer doesn´t get its needed data, it resticts the nose gear steering

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