Ag plane with folding wings
- Thread starter DropTank
- Start date
EIR
It's 5 o'clock somewhere
It's called pencil whipped annuals.
NovemberEcho
Dergs favorite member
single spar runs through both wings so if it goes both wings go
stroboli62
Well-Known Member
Same for a PBY4-2 about same time frame.....
stroboli62
Well-Known Member
Not really the same
Gives a lil idea why some inspections are important....some will get the idea
Wardogg
Meat Popsicle
DeltaAlphaNovember
Well-Known Member
Back in 2012 the Charlotte ANG lost a C-130 doing some aerial fire fighting.
knot4u
Repeat Offender
That was a C-130A that started life with Aeroproduct three blade props that didn't have a synchrophaser function. There was a harmonic resonance issue with them that wasn't understood for a while. I doubt many here have ever seen a three blade Electra/P-3 or C-130. That's why they went to a four blade Hamilton Standard prop with a synchrophaser, it kept the RPM synched but it also matched the props angle. Seeing one completely out of phase in flight is pretty rare, and apparently it worked. I might've worked on some of that stuff.
Murdoughnut
Well sized member
Forget weakened spar - Ripslinger was probably behind this.
knot4u
Repeat Offender
I don't use any streaming services other than youtube or Netflix and I've never seen this movie (obviously I don't have kids). Where might one find these movies online?
Minuteman
Shipoaster
My man, let me introduce you to a slippery slope of sloth via justwatch.com
I didn't know the movie either, but found it is a character in Planes (2013). It is a Disney joint and can be streamed via DisneyPlus, or rented via additional venues.
Planes streaming: where to watch movie online?
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Wardogg
Meat Popsicle
20 years as a Flight Engineer. F/R/T models.
I was in Rosecrans Mo getting ready to fly when this happened. We had a moment, crosses our respective chests and went on with the mission.
inigo88
Composite-lover
Weakened spar. These photos were shared on the Facebook group with the original video.
To my slightly trained eye, it looks like a fatigue failure of the built up aluminum extrusions surrounding the wing attach bolt. The “tree rings” are a sign of relative displacement of the metal. The fatigue crack probably originated at the edge of that bolt hole (where the stress concentration factor is the highest) and worked it’s way through the metal over many years. There’s also corrosion on the bolt and in the hole which certainly wasn’t helping matters.
This is a somewhat similar failure mode to the Embry-Riddle Piper Arrow, though different spar design. The AD resulting from that accident forces the removal of the wing attach bolts and inspecting the spar cap bolt holes with an eddy-current machine. Eddy current likely would have found this crack as well.
Aluminum has a finite life. Every flight is a cycle. You only get so many cycles / hours before you have to replace parts and start over.
To my slightly trained eye, it looks like a fatigue failure of the built up aluminum extrusions surrounding the wing attach bolt. The “tree rings” are a sign of relative displacement of the metal. The fatigue crack probably originated at the edge of that bolt hole (where the stress concentration factor is the highest) and worked it’s way through the metal over many years. There’s also corrosion on the bolt and in the hole which certainly wasn’t helping matters.
This is a somewhat similar failure mode to the Embry-Riddle Piper Arrow, though different spar design. The AD resulting from that accident forces the removal of the wing attach bolts and inspecting the spar cap bolt holes with an eddy-current machine. Eddy current likely would have found this crack as well.
Aluminum has a finite life. Every flight is a cycle. You only get so many cycles / hours before you have to replace parts and start over.
