C210 wing spar failure in Aus : C177 inspection recommended as well

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Taildraggerdriver
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Re: C210 wing spar failure in Aus

Unread post by Taildraggerdriver » Wed Jun 26, 2019 9:43 pm

CarlGrobler58 wrote:
Wed Jun 26, 2019 8:57 pm
Any idea as to how much that spar will cost to replace?
It’s not the spar
It’s the carry through spar.
It would be repairable,
But my guess is there won’t be many with this issue
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Re: C210 wing spar failure in Aus

Unread post by stefan » Fri Jun 28, 2019 8:06 pm

Lood wrote:
Sun Jun 09, 2019 6:47 am
Mooney:
Same observation. That is a negative load on there which makes it even more impressive.
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Re: C210 wing spar failure in Aus

Unread post by Taildraggerdriver » Sat Jun 29, 2019 9:44 am

stefan wrote:
Fri Jun 28, 2019 8:06 pm
Lood wrote:
Sun Jun 09, 2019 6:47 am
Mooney:
Same observation. That is a negative load on there which makes it even more impressive.
Yes it does,
The 210 wing didn’t fail, corrosion caused a carry through spar to fail,
Anyway the Mooney is a 2+2
Little airplane, won’t fit 2 big guys in front, except if they hug each other
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Re: C210 wing spar failure in Aus

Unread post by Andrew Fletcher » Sun Jun 30, 2019 5:26 pm

Has there been a definitive finding that corrosion was the initiating factor for the fatigue failure?
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Re: C210 wing spar failure in Aus

Unread post by Starship » Sun Jun 30, 2019 8:54 pm

This is the carry-thru spar from that crashed C210. It's a 5000 pixel wide photo so you can zoom right in. It's an 18kg chunk of aluminium. I believe these are not available new from Cessna, so should one need to replace one that has become unserviceable, a replacement part would have to come from a salvage yard. Cost could be anything from $2,000 to $10,000 for a good one. Repair of damaged or corroded carry-thru spars was never intended and therefore not recommended. Add to that the labour cost - around 40 man-hours to remove and install the wings and 80 man-hours to replace the carry-thru spar.
C210 Wing Carry Thru Spar.jpg
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Re: C210 wing spar failure in Aus

Unread post by mnmodels » Sun Jun 30, 2019 10:02 pm

Excellent post startship - and yes - no one is allowed to repair a machined piece of alluminium on any cessna. It must be replaced. An exspensive job. Would like to know if this 210 CT was inspected and ultrasound at 100h intervals.

On the side - it is interresting to note that the CT is not symetrical. And i have seen a video of 210 pulling negative G's.

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Re: C210 wing spar failure in Aus

Unread post by heisan » Sun Jun 30, 2019 10:50 pm

mnmodels wrote:
Sun Jun 30, 2019 10:02 pm
Excellent post startship - and yes - no one is allowed to repair a machined piece of alluminium on any cessna. It must be replaced. An exspensive job. Would like to know if this 210 CT was inspected and ultrasound at 100h intervals.

On the side - it is interresting to note that the CT is not symetrical. And i have seen a video of 210 pulling negative G's.

Rgds,
It is only really aerobatic machines that have symmetric load ratings. 210 is rated +3.8G and -1.52G, so a symmetrical spar cap would be needlessly heavy for the rated loads.
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Re: C210 wing spar failure in Aus

Unread post by Bearcat » Sun Jun 30, 2019 10:57 pm

heisan wrote:
Sun Jun 30, 2019 10:50 pm
mnmodels wrote:
Sun Jun 30, 2019 10:02 pm
Excellent post startship - and yes - no one is allowed to repair a machined piece of alluminium on any cessna. It must be replaced. An exspensive job. Would like to know if this 210 CT was inspected and ultrasound at 100h intervals.

On the side - it is interresting to note that the CT is not symetrical. And i have seen a video of 210 pulling negative G's.

Rgds,
It is only really aerobatic machines that have symmetric load ratings. 210 is rated +3.8G and -1.52G, so a symmetrical spar cap would be needlessly heavy for the rated loads.
Hmmm .. I hope the Namib 210 pilots are taking note
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Re: C210 wing spar failure in Aus

Unread post by TOFFS » Mon Jul 01, 2019 8:19 am

On this subject Cessna have issued two Mandatory SELs on 24/06/2019, one for the C210 and the other for the C177.
SEL-57-06 Cessna 210.pdf
SEL-57-07 Cessna 177.pdf

Having a look at that carry through I can't see any corrosion, this usually happens either on the lower face or between where the roof skin attaches to the carry through spar. If there was, it would have pulled the rivet heads off as well as being observed on the attaching face. At the crack I can't see any indication of the start of a crack prior to the failure. It looks like it failed in one go (my observations only).
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Re: C210 wing spar failure in Aus

Unread post by CarlGrobler58 » Mon Jul 01, 2019 8:42 am

I'm sure a modern CNC mill can make short work of making one. Assuming paper work can be put in place.
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Re: C210 wing spar failure in Aus

Unread post by Carel » Mon Jul 01, 2019 8:52 am

Eish,
This will add a few R's to my next MPI... :cry:
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Re: C210 wing spar failure in Aus

Unread post by Pete » Mon Jul 01, 2019 9:13 am

Mmm... 12000 hour plus airframe used in as Cessna calls it "SEVERE usage" for at least 6000 hours of those and would / should have had at least 5 of these inspections.
As the accident report says Preliminary examination of the spar identified that it had fractured through an area of pre-existing fatigue cracking.
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Re: C210 wing spar failure in Aus

Unread post by wingnutzster » Mon Jul 01, 2019 12:13 pm

Corvus wrote:
Sat Jun 08, 2019 11:05 pm
Cessna Wing Spar Test Pic
Now get them all to do squats in a rhythmic fashion over an extended period with the occasional jump asymmetrically and the test will be more accurate
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Re: C210 wing spar failure in Aus

Unread post by Chalkie » Sun Jul 07, 2019 3:19 pm

mnmodels wrote:
Sun Jun 30, 2019 10:02 pm
Excellent post startship - and yes - no one is allowed to repair a machined piece of alluminium on any cessna. It must be replaced. An exspensive job. Would like to know if this 210 CT was inspected and ultrasound at 100h intervals.
That carry through looks like a forging to me, which is then machined. OK.

At the fail point, LHS, front face about 1/4 up and again (on far side) at about 1/2 way up shear flange. The discolouration looks like corrosion to me.

Nothing lasts for ever. Perhaps Mr Cessna needs to add a life limit?
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Re: C210 wing spar failure in Aus

Unread post by Starship » Sun Jul 07, 2019 9:17 pm

Crack to the future.jpg
Flight Safety Australia had an article about cracking wing spars on the C210 nearly 5 years ago

https://www.flightsafetyaustralia.com/2 ... he-future/
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