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t.j.vanduin(at)gmail.com
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 Posted: Thu Sep 02, 2010 2:37 pm Post subject: Howling/scraping noise at flaps deflection |
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Fellow Allegro listers,
Today, at the preflight check, a loud howling/scraping noise was heard
at the deflection of the flaps from pos. zero to pos. one, probably at the
left upper side of the plane.
Further down, from pos.one to two, the sound was gone.
Did anyone of you experience this problem? Could it possibly be solved by
oiling the control rod tubular bearings? If so, what type of oil is to be used?
Theo van Duin (France)
Allegro 2000
71MM
[quote][b]
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hgmckay
Joined: 23 May 2006
Posts: 397
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| Posted: Thu Sep 02, 2010 3:30 pm Post subject: Howling/scraping noise at flaps deflection |
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Theo,
There are two plastic (neoprene??) bearings that the flap torque tube rotates in. See attached photo. They are located close togather in the area just behind the bulkhead rib that the the pilot seat belts are bolted to. These could be drying out for some reason. I would not use oil on them. Instead I would try a silicone lubricate on them. You should be able to find this in an aerosol spray can. If this does not solve the problem, check the two corrugated rubber sleeves at the ends of the flap tube where it penetrates the fuselage. Spray the rubber sleeve/fuselage contact surface with some silicone spray as well. While you are doing all of this check the flap servo motor screw. Make sure it is well lubricated and not binding because it screws into a plastic housing that has (neoprene??) threads. I use white lithium grease on the screw itself. Let us know if this works.
Hugh McKay
Allegro 2000
Rotax 912 UL
N661WW
From: theo van duin (t.j.vanduin(at)gmail.com)
Sent: Thursday, September 02, 2010 6:35 PM
To: allegro-list(at)matronics.com (allegro-list(at)matronics.com)
Subject: Howling/scraping noise at flaps deflection
Fellow Allegro listers,
Today, at the preflight check, a loud howling/scraping noise was heard
at the deflection of the flaps from pos. zero to pos. one, probably at the
left upper side of the plane.
Further down, from pos.one to two, the sound was gone.
Did anyone of you experience this problem? Could it possibly be solved by
oiling the control rod tubular bearings? If so, what type of oil is to be used?
Theo van Duin (France)
Allegro 2000
71MM
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