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KeysFox
Joined: 05 Jan 2009
Posts: 137
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 Posted: Fri May 21, 2010 10:55 pm Post subject: ground loop |
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Where does one need to look for (hidden) damage after ground loops with a gear collapse or unusually hard landings in a model IV Kitfox?
With a prop strike on a Rotax 912, have folks found crank shaft damage or gear box damage? If so how does one detect crank damage without engine tear down?
BJ
[quote][b]
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B Jones
N154K
443-480-1023 |
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Joel
Joined: 06 Oct 2006
Posts: 57
Location: Bremerton, WA USA
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| Posted: Sat May 22, 2010 6:09 am Post subject: Re: ground loop |
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BJ,
After a prop strike on a Rotax 912/914 the gearbox should be removed and sent to an approved repair facility for inspection. While the gearbox is off, check the run out of the crankshaft. As I recall .002 is the limit, but check the Rotax heavy maintenance manual to be sure.
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Joel Mapes Kitfox 5 912 ULS Aerocomp amphibs |
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Tom Jones
Joined: 12 Mar 2006
Posts: 752
Location: Ellensburg, WA
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| Posted: Sun May 23, 2010 4:53 am Post subject: Re: ground loop |
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BJ, One thing about powder coating if this one is, is that it makes it difficult to detect cracks so check close. Remove the seat and check the bulkhead/truss that the bungees wrap around for any bent tubing.
Did a wing tip strike the ground with any significant force? If so, stretch a string tight from wing root to tip above each spar to be sure they are still straight.
Remove the wing tip and check the wood structures inside the wing.
Take the wing off and check the spar attach lugs and their welds to the the spar carry through tubes for any damage. Replace the bolt that attaches the rear spar and the pin on the front spar. When you remove the old hardware be sure the bolt/pin and their respective attach lugs are not bent. Does the bolt/pin still slide in and out of the attach lug smoothly?
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Tom Jones
Classic IV
503 Rotax, 72 inch Two blade Warp
Ellensburg, WA |
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gebuchanan(at)cox.net
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| Posted: Sun May 23, 2010 8:11 pm Post subject: ground loop |
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At 11:54 PM 5/21/2010, you wrote:
| Quote: | | Where does one need to look for (hidden) damage after ground loops with a gear collapse or unusually hard landings in a model IV Kitfox? |
What kind of gear? Spring? Bush? Stock bungee? With stock gear, beyond the gear itself I'd look for damage in the fuselage at the "bungee bulkhead" Simply running a straight edge across the top of the athwartships bungee bulkhead and across the top of the bottom door sills will tell you if something's moved. Then a straight edge along the fuselage lower stringers where the gear attach to see if they're bent out of shape. If the wing tip hit hard then some triangulation checks off the outboard strut ends to see if the fuselage is bent / twisted. (Of course, this assumes everything was assembled straight in the first place.  I'd measure off the strut ends to eliminate the bent wing.)
| Quote: | | With a prop strike on a Rotax 912, have folks found crank shaft damage or gear box damage? If so how does one detect crank damage without engine tear down? |
Post this on the Matronics Rotax site, you'll get a broader return. Also Google, as there have been many 912 prop strikes and I've seen the same question asked elsewhere.
Good luck!
Guy Buchanan
Troop 680 Scoutmaster
(760) 809-6145
www.troop680.org [quote][b]
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