Yak42 crash, Russia
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hmm
That last video appears to show the nose lifting, since it seems to be the belly that hits the camera, not the nose or nosewheel.
That would seem to rule out flight control issues causing inability to rotate...?
The quality is so low I dont think you could hope to tell if the brakes were smoking - other than not trailing a huge plume of smoke, you just cant tell (well, i cant)
That last video appears to show the nose lifting, since it seems to be the belly that hits the camera, not the nose or nosewheel.
That would seem to rule out flight control issues causing inability to rotate...?
The quality is so low I dont think you could hope to tell if the brakes were smoking - other than not trailing a huge plume of smoke, you just cant tell (well, i cant)
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That last video appears to show the nose lifting
The relatively high camera perspective does not clearly show ground-tail contact during rotation-but it is close.
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All three are from one source (LifeNews aka Russian "Sunday Mirror" yellowpaper newsagency) but from different hostings.
This one more interesting, I think - view to runaway from taxi #4:
© from ru_aviation:
This one more interesting, I think - view to runaway from taxi #4:
© from ru_aviation:
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MK.ru reports that the pilot took ill only minutes before take off and handed off duties to the co-pilot. Early discoveries suggest that the handbrake on the plane wasn't released. This seems very hard to believe.....or is it?
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Google Translate:
I wonder if the brakes would have had trouble disengaging after the amount of energy that would of been placed into it.
According to our source, the credible, the commission has found that the plane began to crackdown on the runway with the parking brake nevyklyuchennym. This device - analog handbrake in a car - used only for parking. Engine power is enough that the aircraft moved from its place, being on the parking brake (as well as some forgetful motorists gets under way on the "hammer") and have driven on a taxiway to the runway. But to accelerate to takeoff speed is already becoming problematic.
In addition, the source said, "MK", which, according to the transcripts of the speech recorder Yak-42, immediately before takeoff the aircraft commander ordered Andrew Solomentsev second pilot Igor Zhevelovu to take it over, citing poor health.
The parking brake was off just a commander. But perhaps the moment of transfer of control of the pilots just forgot it and did not pay attention to the corresponding signal on the dashboard (beep it is not duplicated).
Neisklyucheno that when the Yak-42 began to accelerate for takeoff and could not gain the required speed, the pilots noticed a mistake and turned off the brake.
In addition, the source said, "MK", which, according to the transcripts of the speech recorder Yak-42, immediately before takeoff the aircraft commander ordered Andrew Solomentsev second pilot Igor Zhevelovu to take it over, citing poor health.
The parking brake was off just a commander. But perhaps the moment of transfer of control of the pilots just forgot it and did not pay attention to the corresponding signal on the dashboard (beep it is not duplicated).
Neisklyucheno that when the Yak-42 began to accelerate for takeoff and could not gain the required speed, the pilots noticed a mistake and turned off the brake.
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Swedish media reports that the PIC forgot to retract the speedbrakes (early reporting of handbrake was allegedly a misunderstanding by the reporting media) that were deployed during take off roll... !
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but the video of the Yak hitting the camera shows the nose clearly being up, i.e. NG off the ground. So a nose heavy condition can be somehow excluded, no ?
and what's behind the alleged health issue of the commander ? let's not go that way will we...
and what's behind the alleged health issue of the commander ? let's not go that way will we...
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Ehhh, Swedish some media report speedbrakes extended and some report parkingbrake set... so please take my eaerlier speedbrake comment with a pinch of salt.
Other sensational media reports the pilot never had flown Yak 42 before but only Yak 40s. I don't know the truth of such allegation but after a quick search on Wikipedia, it is clear that the difference between the two is fairly substantial (the 42 is 4x heavier and takes 4x the pax) in case he was not used to the 42...
Other sensational media reports the pilot never had flown Yak 42 before but only Yak 40s. I don't know the truth of such allegation but after a quick search on Wikipedia, it is clear that the difference between the two is fairly substantial (the 42 is 4x heavier and takes 4x the pax) in case he was not used to the 42...
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Eh? Why would the speedbrakes be deployed in the first place?
No throttle position based-speedbrake interlock?? If so, that would be begging for trouble.
Where are the speed brakes located on the Yak 42?
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Not necessarily. An aircraft which is nose heavy will perhaps not rotate at the scheduled Vr, or perhaps will only rotate slowly, but as speed increases the aerodynamic force of the tail acting to raise the nose will eventually, by the power of "Q", overcome the weight moment. Problem is, if you run out of runway before that can happen ...
Problem is, if you run out of runway before that can happen ...
There isn't nearly enough reliable information yet concerning this accident to make even an educated guess as to whether or not any of those things happened here. It's as good a guess as any and better than most though.
Some investigative work product which might tend to rule some potential causal factors either in or out:
Lab findings regarding the nature of any heat damage to brake units.
FDR traces indicating engine parameters.
FDR airspeed/time history
CVR transcript (translated)
An accounting of actual takeoff weight.
These bits of info are just a few items on a long list of things to be determined. I haven't a clue how quickly the investigation will proceed or how much will be revealed to the public, but I'll keep a watch on this thread for any updates.
