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aerosiam
Joined: 26 May 2008
Posts: 59
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 Posted: Mon Jul 14, 2008 5:29 pm Post subject: Lubricating flap motor screw shaft |
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The flap motor operates a vertical screw shaft which rotates in a nylon bushing riveted to the flap actuating arm. It is accessible after removing the white cover behind the pilot's seat.
The screw shaft should be lubricated with lithium grease, I believe.
If a 3 in 1 type oil is applied to the metal screw shaft, it causes the nylon bushing to expand. Over time, flap movement slows and the flap breaker starts popping due to the excess load. The cure is to tap out the nylon bushing until the screw shaft moves freely inside it.
Regards
Paul
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hgmckay
Joined: 23 May 2006
Posts: 397
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| Posted: Mon Jul 14, 2008 6:35 pm Post subject: Lubricating flap motor screw shaft |
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Paul:
I was not aware that the screw part of the shaft screwed (operated) in a
matching nylon female screw. I have been lubricating the steel screw with
white lithium grease without a problem for two years. I certainly will not
use oil on the screw after reading your post. If oil causes the nylon to
expand over time, why would'nt the Lithium grease do the same thing?
Hugh McKay
Allegro 2000
Rotax 912 UL
N661WW
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