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An-2 crashed at airshow "70 years of An-2" at Chernoe (MARZ)

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An-2 crashed at airshow "70 years of An-2" at Chernoe (MARZ)

Old 24th Oct 2017, 12:53
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Nothing very interesting except that 2P was not buckled and that they rescued video from GoPro.
Ah, also info that fuel used was a strange mix of gas and kerosene (but it was hardly cause).
Also that CPT till 2016 was a 747 pilot-instructor at ABC.
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Old 27th Oct 2017, 05:14
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Wonder what the 2P were up to. There doesn't appear to be an Astro bubble to shoot film out off. Perhaps attending to other cameras or perhaps just forgot to buckle up.





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Old 27th Oct 2017, 18:53
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Maybe they were promised 1G?
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Old 28th Oct 2017, 05:23
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If you look at the wing-over manoeuvres (stall turns) in the display routine videos posted in this thread i doubt there were any promise to maintain 1G.





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Old 30th Oct 2017, 20:00
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Originally Posted by Concours77
Maybe they were promised 1G?
What I said...

Panic can create actions that make no sense, eg: "maybe I can jump out before we hit?"

"Was his instruction tighten restraints, or loosen?"

Or, more than rated G whilst restrained, severing the belts?
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Old 30th Oct 2017, 23:24
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Or, more than rated G whilst restrained, severing the belts?
That was my experience last summer, the seat belt I had been wearing was recovered among the wreckage, with bits of airframe still attached where it had ripped out of the floor.
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Old 31st Oct 2017, 12:33
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Just to clarify, exact phrase from report translates as:
Cpt body was found inside cockpit, at his working place, belted. He died because of impact trauma and fire. 2P belts was not buckled at the time of impact and he was thrown out of the cabin and died because of impact trauma.
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Old 31st Oct 2017, 16:17
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Originally Posted by Kulverstukas
Just to clarify, exact phrase from report translates as:
Cpt body was found inside cockpit, at his working place, belted. He died because of impact trauma and fire. 2P belts was not buckled at the time of impact and he was thrown out of the cabin and died because of impact trauma.
I note this is a preliminary report and obviously brief, though did they mention what sort of buckle it were ? The reliability history of the buckle ?






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Old 31st Oct 2017, 16:55
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Originally Posted by Flying Binghi
I note this is a preliminary report and obviously brief, though did they mention what sort of buckle it were ?
No, none of both.
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Old 31st Oct 2017, 21:21
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The important belt seemed to have been serviceable., per the interim. Even if 2P belt held, it's mounting may have torn from the fuselage, (as above, Pilot DAR).

The most probable conclusion CFIT, but for what reasons? I still think PF had an inkling he may strike the ground, and if he did not change flight path, many would die. So perhaps a heroic sacrifice at the last? Many accidents state these reasons: "Hero Pilot".....
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Old 1st Nov 2017, 10:47
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Just for another clarification, An-2 has only waist belt, not shoulder one.
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Old 1st Nov 2017, 15:47
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Originally Posted by Kulverstukas
Just for another clarification, An-2 has only waist belt, not shoulder one.
Because not certified for aero. Time for retrofit, or placard "no aero"? The accident in question appeared not survivable, seat, shoulder, whatever.
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Old 5th Nov 2017, 01:40
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Originally Posted by Kulverstukas
Just for another clarification, An-2 has only waist belt, not shoulder one.
There may have been a different type of belt fitted. I note the exorst appears to me to have been modified for the air display smoke so other airframe mods may have been done.





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Old 5th Nov 2017, 08:44
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Originally Posted by Flying Binghi
There may have been a different type of belt fitted. I note the exorst appears to me to have been modified for the air display smoke so other airframe mods may have been done.
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Based on multiple videos from the cockpit and livejournal posts of plane owner and his friends about training and show flights at Orlovka and Severka (where this plane was based) - unfortunately mostly these is now deleted from internet - there was no mods done except exhaust pipe and mount for GPS in the cockpit. They don't bother neither with repaint nor with proper documents and airworthiness renewal/prolongation (as you can see from docs posted, it was ended two years ago both for airframe and engine).
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Old 19th Mar 2018, 20:16
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Final report published (in Russian)

The most likely cause of the crash of the An-2 RA-35171 was the failure of the PIC to take into account specific of the An-2 management at high flight speeds (an increase in the time required for the aircraft to leave the bank due to the decrease in the angles of the aileron deflection due to the pulling of the cable line due to a significant increase in forces in the transverse control channel at speeds of 270-300 km / h), which did not allow the aircraft to withdraw from the descent when maneuvering with large bank angles at an extremely low altitude.

The contributing factors were:

- flying the aircraft at modes beyond the limits set by the flight manual of the An-2 aircraft;

- Maneuvering at an altitude less than that established for performing a demonstration flight over the aerodrome.
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Old 20th Mar 2018, 08:23
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Thanks!
And if I see it correctly, the report has pictures taken from the onboard camera, that was recording the whole accident sequence. The control inputs show full aileron deflection attempt to roll right and level.
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Old 21st Mar 2018, 06:06
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Yes. And the conclusion is "too fast, too low".
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Old 26th Mar 2018, 16:21
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On another current thread, the tragic crash of an airliner is under discussion. The aircraft came to grief according to the authority, because an aileron cable “separated”. Yet the aircraft in question was notorious for having “sloppy” aileron inputs, due to untensioned or temp expanded cabling. The official conclusion ignores many areas of study, one of which is the “lack of tension” left in the system post Maintenance. Arguably the loose control cables could have caused the crash, but were ignored in favor of blaming mechanics. No proof of cable separation was found, the conclusion is pure conjecture.
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Old 26th Mar 2018, 18:42
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Having flown a few aircraft with loose cable sloppy ailerons, I have been aware that I could detect this sloppiness as reduced handling in that aircraft. Having noted this condition for that aircraft, I flew it with greater caution. For the routine flown in the accident aircraft, prior to the crash, I would think that a pilot experienced on type would have had the opportunity to get a sense of the aircraft condition in this respect.
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Old 26th Mar 2018, 18:58
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Who would know through experience about the inherent Slop if that was his first time at sixty degrees in roll and beyond Vne? One would hope that was his first excursion to that speed? Who knows the aero of a heavy sluggish biplane with chronically loose controls?

At least one guy, though he cannot share his experience?
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