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Thread: Can hear aileron cable rubbing when cold in 185

  1. #1
    Tom3holer's Avatar
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    Can hear aileron cable rubbing when cold in 185

    I noticed when cold turning the ailerons left or right on the ground with the engine not running I can hear the a aileron cable rubbing in the left wing.
    It was in the low 30's the other day and rotating the wheel I could hear a cable rubbing on what sounded like the aluminum skin. When temp is up around 40's there is no audible rubbing.
    It was my understanding that when cold the cables will be somewhat looser due to the different coefficient of expansion between aluminum and steel. Wings shrink more than cables. Had my mechanic look at it yesterday when it was in the 40's. We opened opened a panel on the aft portion midway out beyond the strut attach point and he said it measured around 22. Said spec was 30 +- 10 which puts it in range. Told him I wanted to take it in the hanger and have him take a good look.
    Can anyone shes a little light in whats going on?

    Thanks,
    Tom

  2. #2

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    Very long shot possibility. IF............you have an autopilot..........and if it attaches to aileron cable............that could be the noise you hear as the attachment point moves around????

  3. #3
    Tom3holer's Avatar
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    Pete,
    Thank you for the reply. I do have an A/P but it was installed last month and uses pushrods but this had been going on for quite some time now.
    Thanks Pete Schoeninger thanked for this post

  4. #4
    Cub Special Ed's Avatar
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    Had same thing happen on my cub the first winter i had it. Noticed an aileron cable scraping noise. Looked up in there with a mirror and a flashlight and found someone went on the wrong side of one of the rib cross braces with the cable. Never notice it until winter also.
    "There are 3 kinds of men. The one that learns by reading. The few who learn by observation. The rest of them have to pee on the electric fence for themselves." Will Rogers

  5. #5
    mvivion's Avatar
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    Yes, Id check entire aileron cable run in that wing.

    MTV
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  6. #6
    www.SkupTech.com mike mcs repair's Avatar
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    Lower rear door post is a common rub spot with fuel line. Sound may be in different area


    Sent from my iPhone using SuperCub.Org

  7. #7
    Tom3holer's Avatar
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    The noise is definitely coming from the left wing about mid section, I am guessing.

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    A #2 phillips screwdriver and a flashlight will solve the mystery.
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  9. #9
    Tom3holer's Avatar
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    Its going in the heated hanger today so the mech can take a good look at it.

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    aktango58's Avatar
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    One thought since it is a 'below freezing' phenomenon, could you have a pulley that won't turn when cold, causing the chafe? If nothing else, that would be something to look for.
    I don't know where you've been me lad, but I see you won first Prize!
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  11. #11
    Tom3holer's Avatar
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    Just finished the annual and every pulley was tested for rotation and lubed. I don't think cable tension was checked however.

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    www.SkupTech.com mike mcs repair's Avatar
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    there is a phenolic rub block about mid wing..... also seen cables fray there..

  13. #13
    Tom3holer's Avatar
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    Bit of a delay and going in Monday to have a look see.

  14. #14
    aktango58's Avatar
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    Quote Originally Posted by Tom3holer View Post
    Just finished the annual and every pulley was tested for rotation and lubed. I don't think cable tension was checked however.
    Bet the annual was done above freezing. Things can get missed.
    I don't know where you've been me lad, but I see you won first Prize!
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  15. #15
    skywagon8a's Avatar
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    Quote Originally Posted by Tom3holer View Post
    We opened opened a panel on the aft portion midway out beyond the strut attach point and he said it measured around 22. Said spec was 30 +- 10 which puts it in range. Told him I wanted to take it in the hanger and have him take a good look.
    Can anyone shes a little light in whats going on?

    Thanks,
    Tom
    Quote Originally Posted by Tom3holer View Post
    Bit of a delay and going in Monday to have a look see.
    Better look before it gets heated up. The rubbing may go away by itself when the plane is warmed up. Your tension was 22 with a tolerance of 20 - 40. Sounds loose to me.
    N1PA
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  16. #16

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    Tom, I was re-rigging last few days and recall the book says aileron carry through cable tension is 40#.
    The Trio aileron servo is attached by a rod to the RH bellcrank. Were there any changes during the install?
    Last edited by Mudwagon; 01-13-2019 at 03:04 PM.
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  17. #17

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    I had to chase down a rubbing cable in the fuselage of a C172. Several of us looked all over for a rub and couldn't find it. Turned out to be a servo capstan rubbing against a cable retainer post.

    We were amazed at how a smooth capstan, running agains a smooth post converted into a rough 'cable rubbing noise'.

    Don
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  18. #18
    Tom3holer's Avatar
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    Yes the Trio uses a pushrod but there were no cable adjustments made. The noise I have noticed for some time long before the A/P installation.
    Mudwagon, Thank you for the heads up, the carry through tension as I see is 40 +-10 so 22 is certainly on the loose side.
    Last edited by Tom3holer; 01-13-2019 at 10:21 PM.
    Thanks Gordon Misch thanked for this post

  19. #19
    FdxLou's Avatar
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    If I recall correctly, the only valid tension measurement is on the aileron carry thru cable. Not on either direct cable.
    Lou
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  20. #20
    www.SkupTech.com mike mcs repair's Avatar
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    Quote Originally Posted by FdxLou View Post
    If I recall correctly, the only valid tension measurement is on the aileron carry thru cable. Not on either direct cable.
    Lou
    I liked this.. but probably not a valid thing... it's a LOOP...

  21. #21
    Tom3holer's Avatar
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    Lou,
    Yes I read that somewhere also and it should be measured in the overhead cabin area.
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  22. #22

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    Do you hear this noise when pushing the ailerons through their range at the wing? Change directions quickly and you may hear the cable slap a little? Sounds normal to me.

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