Hangar Door Jam

Discussion in 'Technical Corner' started by JohnWF, Oct 22, 2016.

  1. JohnWF

    JohnWF Pre-takeoff checklist

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    Took the plane out this morning for a short flight. Noticed an unusual noise as the bi-fold door opened...took plane out, and when closing the door it jammed. Found one of two cables had jumped off its pulley. After a bit a trying to move the door the other cable also jumped off its pulley.

    Fortunately two friends were nearby and together we finally got the plane back in the hangar and after even more work got the door down (more of less free-fall into place.)

    I will get new cables because they were kinked in the process, but cannot reach the pulleys because they are behind a large I-beam, so I will cut two small windows in the door at the pulley location and re-string new cables, then put window plastic over the cut outs. Lots of work, but it should be OK.

    Its a Schweiss door that has been trouble free for a bit over 20-years. But for now the plane is stuck in the hangar...at least its out of the weather until I can get things fixed.
     
  2. Let'sgoflying!

    Let'sgoflying! Touchdown! Greaser! PoA Supporter

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    instead of cutting into the door, can you not just unscrew the exterior sheeting?
    What will keep the cables from jumping off the pulley next time? Maybe a good time to look into pulley guides 'fairleads'.
     
  3. JohnWF

    JohnWF Pre-takeoff checklist

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    Yes, it later struck me to do just that....un-screw panels...what are the pulley guides?

    I suspect that after 20+ years the cables had stretched enough to allow them to slip out of the pulley groove.
     
  4. Let'sgoflying!

    Let'sgoflying! Touchdown! Greaser! PoA Supporter

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    Right, I don't think they should ever get completely slack. Pulley guides...you could buy from Grainger maybe, or a marine shop, or make your own. Look at your airplane for ideas, often they have some way to keep the cable where it belongs.
     
  5. Anymouse

    Anymouse Pattern Altitude PoA Supporter

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    If at all possible, replace the cables with their straps.
     
  6. EppyGA

    EppyGA Final Approach

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    You'll want to check the pulleys. After a period they will wear severely on the back side of the pulley and be as sharp as a knife. It might be best to just buy new pulleys while your buying new cables. Do not buy cable at home depot as it is most likely not the right size and configuration for your door. Get the style and serial number of the door and call Schweiss and buy from them. The cables you buy from them will most likely be cheaper than sourcing it somewhere else. The guides at the bottom are likely all bent up also and will need some straightening and the tubes in the guides probably have grooves cut in them. Replacing the cables is not a hard job at all. Good luck.
     
  7. coloradobluesky

    coloradobluesky En-Route

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    I'd recommend getting somebody experienced on working on those doors. Those doors have killed people. Seriously. I rented a hangar where the guy that built it was killed by his door. Hire someone that knows what they are doing.
     
  8. overdrive148

    overdrive148 Pattern Altitude

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  9. JohnWF

    JohnWF Pre-takeoff checklist

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    I am going to replace the cables with straps...will talk to Wchweiss tomorrow.

    The door is securely attached to the frame...its just the lifting apparatus that is the problem.

    Is there someone on here that has actually made this conversion? I would like to ask a few questions Thanks
     
  10. JohnWF

    JohnWF Pre-takeoff checklist

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    Schweiss quoted me $3,960 to change to straps..they said the drive motor and reduction gear box would have to be changed...pressed for why? they said the diameter of the drive drum would be different and would take more power.

    I really do not believe this..the door only cost $1,732 when purchased and has not gained weight so the lifting forces should be the same....???

    I will secure replacement cables and fix it myself. Very disappointing.
     
    Let'sgoflying! likes this.
  11. pmanton

    pmanton Line Up and Wait

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    My Schweiss door has no pulleys . The cables (4 of them) attach at the top of the frame and the drive shaft simply winds all of them up directly.
     
  12. GlennAB1

    GlennAB1 En-Route

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    Maybe you meant; pulley guards? Fairleads are cable guides.
     
  13. JohnWF

    JohnWF Pre-takeoff checklist

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    Received new aircraft quality 7 x 19 cables yesterday and installed them this morning...a 3 hour job with no need to remove panels or anything. All back to normal.
     
  14. hotprops

    hotprops Line Up and Wait PoA Supporter

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    tell us more about the door manufacturer ma by you can foil a few sales for them as they sound like crooks.and help someone out.