C140 intermittent noise on rollout

Discussion in 'Maintenance Bay' started by GeorgeC, Apr 4, 2019.

  1. GeorgeC

    GeorgeC En-Route PoA Supporter

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    On the landing rollout, sometimes I hear a noise. Not quite grinding, not quite scraping... sounds like I'm dragging a chain behind the plane. It's intermittent. Control inputs or brakes do not seem to affect it, it just comes and goes. New Lang tailwheel. I repacked the bearing, the races were smooth, no signs of seizure or chattering. I never notice it when taxiing to depart, only at slow speeds when I'm wrapping up the landing or taxiing back. I'm out of ideas.
     
    Last edited: Apr 4, 2019
  2. Sinistar

    Sinistar Pattern Altitude

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    I'd think front wheel bearings or brakes as well.
     
  3. GeorgeC

    GeorgeC En-Route PoA Supporter

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    Main gear bearings were inspected/repacked at annual and were reported to be in good shape. Both brakes were serviced just prior to that. The noise sounds like it's coming from the back.
     
  4. eman1200

    eman1200 Touchdown! Greaser! PoA Supporter

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    any chance u could set up a gopro pointing to where u think it's coming from?
     
  5. Lowflynjack

    Lowflynjack Pattern Altitude

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    The Lang tailwheel is solid, correct? I've found that to be a source of noise in almost every plane I've flown with one. It causes a resonation in the fuselage, but only at certain speeds. Try to safely push the stick forward to remove some of the weight from the tailwheel and see if it changes.
     
  6. GeorgeC

    GeorgeC En-Route PoA Supporter

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    Yes, the Lang is solid.

    I got to monkey with it a bit on Saturday. Forward stick to lighten the tail didn't do anything. At one point, though, if I applied light pressure to both brakes, I could deaden whatever it was that was buzzing or vibrating. I don't know if it was the brakes themselves or just the fact that I had slowed; if I taxi slowly enough, it doesn't happen at all.
     
  7. Timbeck2

    Timbeck2 Final Approach

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    You didn't say what aircraft. I flew a Cessna 172 Saturday that had a noise similar to what you describe. It was the metal fairing on the right gear leg.
     
  8. Timbeck2

    Timbeck2 Final Approach

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    yeah...sorry, noticed in the title right after I hit the "post reply" button.
     
    Last edited: Jun 3, 2019
  9. weirdjim

    weirdjim En-Route

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    Goodyear brake clips rattling? Drove me nuts for a couple of months.

    Jim
     
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  10. mondtster

    mondtster En-Route

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    The solid tailwheel can be noisy, especially on grooved pavement.
     
  11. brcase

    brcase Pattern Altitude

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    That is the best guess I have as to the noise I am hearing on the C-120 I have been flying.

    Brian
     
  12. GeorgeC

    GeorgeC En-Route PoA Supporter

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    I think they are Clevelands.
     
  13. GeorgeC

    GeorgeC En-Route PoA Supporter

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    Apparently improperly-riveted linings can make noise. This would be consistent with the noise going away when I get on the brakes.

    http://www.rapcoinc.com/pdf/Informational Tips/Brake Troubleshooting Tips.pdf
     
  14. Dan Thomas

    Dan Thomas Final Approach

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    I chased an intermittent noise in a 150 for some time, and eventually found that the inner race of the outer bearing cone in the right main was cracked. That race will slowly creep around the axle in service, and when the crack was at the bottom, where the rollers were bearing the airplane's weight on it, it would make a rumble as the rollers passed over the crack. Very rare. Such noise can resonate all through the airframe, deceiving one as to its origin.

    Any pitting in any bearing race or roller will also make various noises. Any discoloration of a bearing should be enough cause to replace it. Aircraft wheel bearings are subject to corrosion since the wheel seals are still made of felt, something the automobile industry abandoned 100 years ago, and as an owner washes his airplane he'll often squirt water at the wheel hubs. It gets past those felt seals real easy, mixes with the grease (which is just thickened oil) and forms acids that corrode........

    ......here we go again.......:popcorn:
     
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  15. MBDiagMan

    MBDiagMan En-Route

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    In the title, he indicated a Cessna 140.
     
  16. Timbeck2

    Timbeck2 Final Approach

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    Yeah, been addressed already but thanks for the correction. :rolleyes:
     
  17. weirdjim

    weirdjim En-Route

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    Most of us don't do too well on "I think". Please confirm.

    Thanks,

    Jim
     
  18. GeorgeC

    GeorgeC En-Route PoA Supporter

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    Turns out the preload on the right main was wrong.
     
  19. Kenny Phillips

    Kenny Phillips En-Route

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    As simple as that. Our Skyhawk would make noise after sitting for a couple of weeks in certain weather with the parking brake engaged. Rust on the rotor, except where the pads were touching, made a rhythmic sound.