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jlno7(at)aim.com
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 Posted: Tue Aug 17, 2010 7:37 am Post subject: ground loop damage |
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I assessed the damage with my A&P from the ground loop and found that the leading edge spar is dented-in just outside the strut for about 18 inches. The ribs all look good but I will know more after I remove all the fabric. Two of the flaperon attachments are broken. The wood props were completely broken off. I need advice on how to procede. The ribs are glued to the front spar-can the glue be melted off or can I insert a tube inside the spar or cut out part of the spar? I won't know if the spar is bent until all the fabric is removed. Does the engine need to be torn apart or just the gear box? When I bought the aircraft I was told that modifications from the Kitfox one to a two were made to carry a increased load but no information is available as to the modifications. What changes were made from the one to the two? Would there be a difference in wing structure between the two wings left and right from a one to a two? Any advise would be greatly appreciated.
Jerry Novak
Pulaski WI
[quote][b]
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dholly
Joined: 19 Dec 2006
Posts: 40
Location: Upstate NY
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| Posted: Wed Aug 18, 2010 7:06 am Post subject: Re: ground loop damage |
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Jerry-
I have a few moments to reply. You can find some information on Kitfox model structural changes at the following link: CLICK HERE
If a prop strike has occurred, the engine must be inspected, repaired or overhauled to the extent necessary to bring it back to serviceable condition before further flight. All work has to be performed in accordance with the relevant service manual. For more information, see: WHAT TO KNOW ABOUT PROP STRIKES.
You can 'scarf' on new rib tails for the flaperon hinge ribs, see PIC HERE. If the spar is dented or bent or both, you must replace it. No repair to the damaged spar is considered safe or airworthy. The Hysol adhesive used to glue the ribs to the spar can be loosened with heat. I believe if you search the forums at TEAM KITFOX you will find related 'how-to' discussions. When you are replacing the spar tube, it is probably easiest just to cut the spar in between each rib to facilitate removal after heating. If you are careful, I see no reason why you can't simply slide a new spar into place and, after double-checking for proper wing square and twist, glue the old ribs to the new spar. Of course, you will have to install a new lift strut attach bracket and reattach the internal bracing (should be able to reuse existing) to the spar. I believe the spars come pre-drilled for bracket and braces, makes the job all that easier. All parts are readily available through KITFOX AIRCRAFT.
Sounds rather intimidating, but more time consuming than difficult I think. As has been suggested, might be quicker to find a set of used wings. If you go that route, you might need to install and drill new spar doublers to fit your carry through tube bushings. Whichever solution you choose, make sure to comply with SERVICE BULLETIN #9A.
Hope that helps get you started, good luck!
-Doug
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