B737-300 Rudders
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Joined: Jul 2001
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From: Earth, I think
B737-300 Rudders
Is it correct for B737-300 Rudders to “flap in the wind”?
I saw an un-powered B737-300 on the apron, the wind was blowing from behind the aircraft and the rudder was moving, all be it slowly, back and forth, from one stop to another.
[ 10 September 2001: Message edited by: loggerhead ]
I saw an un-powered B737-300 on the apron, the wind was blowing from behind the aircraft and the rudder was moving, all be it slowly, back and forth, from one stop to another.
[ 10 September 2001: Message edited by: loggerhead ]
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The short answer is YES this is a normal situation for a depowered B737. When there is no power on the A/C there is no hydraulic pressure to the rudder to prevent movement. There is a damping effect of the fluid left on the lines but there is no "fluid lock" of control lock in the system.
The procedure at my company is to leave at least 1 electric "B" pump on in windy conditions to prevent such flapping. Unfortunately this is to no avail when there is no power on the A/C.
Cheers
The procedure at my company is to leave at least 1 electric "B" pump on in windy conditions to prevent such flapping. Unfortunately this is to no avail when there is no power on the A/C.
Cheers
Joined: Mar 2001
Posts: 2
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From: Bundaberg, QLD, Australia
i would park the aircraft so the wind wasn't blowing from behind. if you park the aircraft into a headwind it prevents stress of the control surfaces and it would stop the rudder "flapping"
[ 11 September 2001: Message edited by: pohlcatt ]
[ 11 September 2001: Message edited by: pohlcatt ]
