Piper PA-28 wing falls off

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Re: Piper PA-28 wing falls off

Unread post by Spoke Eagle » Fri Apr 20, 2018 6:56 am

:shock:
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Re: Piper PA-28 wing falls off

Unread post by richard C » Fri Apr 20, 2018 8:26 am

Unreported ground handling incident ?
Grant all equity and dignity.
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Re: Piper PA-28 wing falls off

Unread post by ddevos » Fri Apr 20, 2018 8:49 am

richard C wrote:Unreported ground handling incident ?
Or a very hard landing followed by inadequate repairs?
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Re: Piper PA-28 wing falls off

Unread post by Backmarker » Fri Apr 20, 2018 8:56 am

Or Aeros? This aircraft definitely had some abuse or an accident.
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Re: Piper PA-28 wing falls off

Unread post by jimdavis » Fri Apr 20, 2018 9:51 am

Backmarker wrote:Or Aeros? This aircraft definitely had some abuse or an accident.
Absolutely. My old 140 EKE has done over 20 000 hours. It is not a time thing it is an abuse thing.

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Re: Piper PA-28 wing falls off

Unread post by heisan » Fri Apr 20, 2018 10:01 am

The NTSB report is a little more interesting than the newspaper article.

https://app.ntsb.gov/pdfgenerator/Repor ... m&IType=FA

Photo of the fractured spar cap is interesting. To my untrained eye, it looks like quite an old crack originating at the bolt hole, and spreading from there. Would probably have been visible for many MPIs prior to the accident. I wonder if the MPI schedule calls for a visual inspection of this area?
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Re: Piper PA-28 wing falls off

Unread post by Volo » Fri Apr 20, 2018 12:16 pm

heisan wrote:The NTSB report is a little more interesting than the newspaper article.

https://app.ntsb.gov/pdfgenerator/Repor ... m&IType=FA

Photo of the fractured spar cap is interesting. To my untrained eye, it looks like quite an old crack originating at the bolt hole, and spreading from there. Would probably have been visible for many MPIs prior to the accident. I wonder if the MPI schedule calls for a visual inspection of this area?
Exactly that - The striations or series of rings are fatigue related and are clearly generated from the bolt holes . Rough edges from the hole drilling probably produced the original stress raiser . It looks as though the spar was down to below half its original strength when it let go .
I would not be surprised if some sort of inspection will become mandatory regarding this failure .
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Re: Piper PA-28 wing falls off

Unread post by richard C » Fri Apr 20, 2018 12:36 pm

Surely not !

This is a Cherokee, probably millions of accumulated hours in the training environment. Never a wing lost prior, I would guess.

This has to be a specific problem to this particular aircraft, or the ATO in the way they manage their aircraft.
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Re: Piper PA-28 wing falls off

Unread post by happyskipper » Fri Apr 20, 2018 10:57 pm

Mark 8)
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Re: Piper PA-28 wing falls off

Unread post by Rotor kop » Sat Apr 21, 2018 6:30 am

heisan wrote:The NTSB report is a little more interesting than the newspaper article.

https://app.ntsb.gov/pdfgenerator/Repor ... m&IType=FA

Photo of the fractured spar cap is interesting. To my untrained eye, it looks like quite an old crack originating at the bolt hole, and spreading from there. Would probably have been visible for many MPIs prior to the accident. I wonder if the MPI schedule calls for a visual inspection of this area?
Looking at that drawing. Only the first pair of bolts are doing the work. Cant believe there are not tons more of these incidents. There is no extra support in that area and according to me there should be. A fine example is to look at Frank Robinsons extra support he does on the tail boom where it joins the hull. Wings that are unsuportedby a strut give me the hibby jibbies :shock: I am sure they are fine as they have been around for ages and have millions of hours but i feel more comfortable in a "built like a tractor" fixed wing.
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Re: Piper PA-28 wing falls off

Unread post by Rotor kop » Sat Apr 21, 2018 6:34 am

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Re: Piper PA-28 wing falls off

Unread post by Barros » Sat Apr 21, 2018 8:21 am

This accident may make me think twice next time I climb into a Pa 28
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Re: Piper PA-28 wing falls off

Unread post by Volo » Sat Apr 21, 2018 8:43 am

Surprisingly - the Spar root is a crap design . Best design would be a tongue with bolts through the web .
They have put bolts through the Flange which is what takes the load .
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Re: Piper PA-28 wing falls off

Unread post by happyskipper » Sat Apr 21, 2018 9:58 am

flyinghighno2 wrote:This accident may make me think twice next time I climb into a Pa 28
Dead right FH2 - I have always felt safe in cherokees - now, maybe not so much.
My pre-flights are going to be a lot more thorough from now on....
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Re: Piper PA-28 wing falls off

Unread post by TOFFS » Sat Apr 21, 2018 10:40 am

The PA 28s main spar slots tightly into the fuselage in a spar box and is bolted through the upper and lower spar caps. This is a very strong attachment (as demonstrated by a million hard landings).

Inspection in this area during MPI is difficult compounded by upholsterers taking the easy road and gluing their brand new carpet over the spar box instead of the hassle of putting press studs as Piper intended. As per normal, the lightening holes would never be adjacent the bolts as this would make life to easy. So, pulling the owners brand new carpet off the spar cap, standing on your head with torch and mirror to inspect the spar often gets ignored by some.

In South Africa RSA AD 97-02 has you x-ray in this area every five years. It does take a very well trained eye to pick up cracks or corrosion, even on an x-ray.

From viewing the picture of the affected wing, there is no corrosion seen. There are old cracks that weaken the structure to the point of total failure.

Unfortunately, no pre-flight inspection gains access to where this failure occurred and if this accident makes you scared of flying a Cherokee you had then better be very wary of flying just about any other aircraft and I am not the biggest Piper fan but that wing attachment is as strong as you can possibly make it without any huge weight penalties.
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