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  #1  
Old 08-28-2017, 05:38 AM
JRo JRo is offline
 
Join Date: Dec 2011
Location: Poestenkill, NY (near Albany)
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Default RV-12 accident

Saturday after a normal gentle touchdown at 5B7 the nosewheel departed the aircraft. After skidding a few feet on the nose strut, the strut folded and the prop struck the surface, resulting in sudden engine stoppage. the separated nose wheel struck the right stabilator, resulting in considerable damage to the stabilator. No injuries. Initial inspection of the recovered wheel shows a clean break in the nose wheel fork at a weld point. No cracks were observed prior to this event, even though fork had been carefully inspected in compliance with SB.
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  #2  
Old 08-28-2017, 05:42 AM
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Piper J3 Piper J3 is offline
 
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How many hours on the aircraft? Rough field operations or mostly paved runways? Any botched landings prior such as nose wheel strike?
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Last edited by Piper J3 : 08-28-2017 at 06:52 AM.
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  #3  
Old 08-28-2017, 06:00 AM
JBPILOT JBPILOT is online now
 
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Default Pics would really help - -

especially of the actual break area. Thanks
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  #4  
Old 08-28-2017, 08:16 AM
rvbuilder2002 rvbuilder2002 is offline
 
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Location: Hubbard Oregon
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Quote:
Originally Posted by JRo View Post
No cracks were observed prior to this event, even though fork had been carefully inspected in compliance with SB.
I imagine everyone realizes that it is not possible for a normal/gentle landing to fail the nose fork on an RV-12 unless it already had previous (possibly missed / undetected) damage........
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  #5  
Old 08-28-2017, 09:11 AM
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DaleB DaleB is online now
 
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Location: Omaha, NE (KMLE)
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Quote:
Originally Posted by rvbuilder2002 View Post
I imagine everyone realizes that it is not possible for a normal/gentle landing to fail the nose fork on an RV-12 unless it already had previous (possibly missed / undetected) damage........
That's what I would think... so how do you think people are missing the existing damage/cracks? Is an external inspection enough, or could the cracks be starting on the inner parts of the fork and not be visible from the outside without complete disassembly?

I've inspected mine in detail twice recently, once just after the notification was published and once during the condition inspection. I cleaned it off and inspected closely, but stories like this have me wondering if it's enough. I don't recall ever abusing the nose wheel, but I'm not the only person who's flown it.
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  #6  
Old 08-28-2017, 09:23 AM
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DonFromTX DonFromTX is offline
 
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Location: La Feria Texas
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I am guessing that the crack was at the area where the weld and the base metal join. Often there is what almost appears as a crack there, but is just part of the weld process, when that crack follows the irregular path of the edge of the weld, it is easy to miss unless inspected very closely..
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  #7  
Old 08-28-2017, 09:31 AM
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snopercod snopercod is offline
 
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Is the fork steel or aluminum? It seems like magnaflux or dye-penetrant inspections might be advisable as part of the annual condition inspection.
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  #8  
Old 08-28-2017, 10:05 AM
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DonFromTX DonFromTX is offline
 
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It is aluminum.

QUOTE=snopercod;1199640]Is the fork steel or aluminum? It seems like magnaflux or dye-penetrant inspections might be advisable as part of the annual condition inspection.[/quote]
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  #9  
Old 08-28-2017, 10:09 AM
2johns 2johns is offline
 
Join Date: Apr 2008
Location: Great Falls, Montana
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Best way to take care of the problem is to buy the new heavy duty fork. That's what I did. Years ago I made a bad landing with my Long Ez, broke the lighter duty nose fork that I had not replaced with a new heavy duty one. It flew back and trashed my prop. Live and learn!
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  #10  
Old 08-28-2017, 11:18 AM
Larco Larco is offline
 
Join Date: Mar 2005
Location: DVT Phoenix
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If I understand this correctly, If the fork is not visible for an inspection as a preflight option and is subject to sometime acquiring a crack or breaking at the weld. Why not replace the fork with the updated version??? The cost of doing so versus the optional outcome seems to be a no brainer?? Just saying
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