Yak42 crash, Russia
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@RegDep
Thanks.
If you look at the end of the runway near the ILS in the photo you posted you see very clearly that the gap between the runway and the ILS is dirt as opposed to the photo by Kulverstukas where it is grass. The simulation of accident as described in the video from the "custom official" also indicates the surface was dirt.
But if you look at the initial video posted by ErwinS it certainly looks like grass to me at the end. Especially so when you compare the side shot with the end shot as posted by Kulverstukas in post #51. But the videos are grainy and it's hard to to say with certainty.
Thanks.
If you look at the end of the runway near the ILS in the photo you posted you see very clearly that the gap between the runway and the ILS is dirt as opposed to the photo by Kulverstukas where it is grass. The simulation of accident as described in the video from the "custom official" also indicates the surface was dirt.
But if you look at the initial video posted by ErwinS it certainly looks like grass to me at the end. Especially so when you compare the side shot with the end shot as posted by Kulverstukas in post #51. But the videos are grainy and it's hard to to say with certainty.
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MountainBear, Kulverstukas' is a picture that appeared in several Russian forums after the accident (so are mine, but they look older to me, the second one clearly so). I am sure he will explain it tomorrow; not it is well past midnight in his location.
Edit to say that according to the picture information in the file, it was taken on 2010:05:30 at 10:54:56.
Reg
Edit to say that according to the picture information in the file, it was taken on 2010:05:30 at 10:54:56.
Reg
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EXIF
Make: Canon
Model: Canon PowerShot SX200 IS
Exposure: 1/200
Aperture: f/4.5
Focal lenght: 24mm
ISO: 80
EV comp: 0 eV
Taken: 30 May 2010, 10:54
Photo by pilo6986 at Yandex.Fotki
You can ask pilo6986 directly.
Make: Canon
Model: Canon PowerShot SX200 IS
Exposure: 1/200
Aperture: f/4.5
Focal lenght: 24mm
ISO: 80
EV comp: 0 eV
Taken: 30 May 2010, 10:54
Photo by pilo6986 at Yandex.Fotki
You can ask pilo6986 directly.
Last edited by Kulverstukas; 11th Sep 2011 at 09:53.
Psychophysiological entity
this pretty much takes care of all the prevailing theories floating around so far. Time to make new ones
Could load distribution have played a role? Hockey players are large men, usually weighing over 90 kilos.
Maybe incorrectly loaded with extreme forward CofG ?
I wasn't really convinced by my notion on the first page - just extreme lateral thinking, but for the moment other possibilities seem thin on the ground.
I suppose there's the remotest chance there was an horrific fire in the rear, and a frantic scurry forward by 40 very nimble guys.
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Estimating Rollout Speed from Videos
Having 2 video views of the aircraft rolling out allows estimating the speed of the aircraft based on a number of measurements (assumptions) - first order estimates at the very best. Of course the final accurate answer will hopefully come from the recovered FDR. I offer this as just an exercise and NOT in any way a definitive estimate of speed of the accident aircraft.
From the end view video, it appears the aircraft lights dip noticeably at about 22 seconds (post # 51 video) and collides with the camera assumed to be mounted on the ILS localizer tower at 27 seconds. The map view of the runway shows a culvert just past the runway, likely draining into the river. Assuming the apparent dip of the aircraft (main gear still on the ground) was caused by rolling over this depression, and knowing the time interval AND distance between the culvert and ILS tower would give the speed of the aircraft. From the scale on the map I measure 413 meters (+/- ???). Traveling 413 meters in 5 seconds would give an 'average interval' speed of 161 knots. NB The time period (5 seconds) is the weakest assumption and likely largest source of error here.
From the side view video what's needed is the frame rate of the camera (frames per second). The scale could be determined by using the published length of the aircraft (YAK-42D ??? 36.4 meters) and measure the displacement frame to frame of the aircraft measured in length units of the plane on the screen. For example if the frame rate is 4 per second (0.25 second) a 36.4 meter long aircraft traveling at twice its length per second (72.8m/sec = 142 knots) should be displaced by half its length per frame.
What's needed is better video processing software with better time resolution on both videos - I don't own any, so I make no estimate here. Someone who does with some time to kill, might want to carry this exercise further with possibly a bit more accuracy. Use the last 2 or 3 frames as the aircraft goes off screen left because the camera view there is more perpendicular to the runway - less perspective error.
Again I offer this as only an excersie or a template for analysis and make no claim of accuracy for the limitations I stated. We of course await the actual numbers from MAK and the FDR.
Thanks.
From the end view video, it appears the aircraft lights dip noticeably at about 22 seconds (post # 51 video) and collides with the camera assumed to be mounted on the ILS localizer tower at 27 seconds. The map view of the runway shows a culvert just past the runway, likely draining into the river. Assuming the apparent dip of the aircraft (main gear still on the ground) was caused by rolling over this depression, and knowing the time interval AND distance between the culvert and ILS tower would give the speed of the aircraft. From the scale on the map I measure 413 meters (+/- ???). Traveling 413 meters in 5 seconds would give an 'average interval' speed of 161 knots. NB The time period (5 seconds) is the weakest assumption and likely largest source of error here.
From the side view video what's needed is the frame rate of the camera (frames per second). The scale could be determined by using the published length of the aircraft (YAK-42D ??? 36.4 meters) and measure the displacement frame to frame of the aircraft measured in length units of the plane on the screen. For example if the frame rate is 4 per second (0.25 second) a 36.4 meter long aircraft traveling at twice its length per second (72.8m/sec = 142 knots) should be displaced by half its length per frame.
What's needed is better video processing software with better time resolution on both videos - I don't own any, so I make no estimate here. Someone who does with some time to kill, might want to carry this exercise further with possibly a bit more accuracy. Use the last 2 or 3 frames as the aircraft goes off screen left because the camera view there is more perpendicular to the runway - less perspective error.
Again I offer this as only an excersie or a template for analysis and make no claim of accuracy for the limitations I stated. We of course await the actual numbers from MAK and the FDR.
Thanks.
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Galimov did not make it
Sadly Alexander Galimov did not recover from the burns suffered in the crash
BBC News - Russian plane crash: Last ice hockey team member dies
BBC News - Russian plane crash: Last ice hockey team member dies
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Voice of Russia - Afterburner not lit
A wrongly chosen engine operating condition may have been the likely cause of the recent crash of a YAK-42 airliner near Yaroslavl on the 7th of this month, a crash that claimed the lives of the local Lokomotiv hockey club team.
This came in a statement for the Interfax news agency by a source in the law enforcement bodies.
A lead is now being followed up whereby the pilots may have failed to light the afterburner during the take-off run.
As a result, the plane failed to pick up the required speed due to insufficient thrust to gain height during the take-off.
The lead is proved by the fact that the pilots, when still on the runway, failed to report any technical problem to the flight traffic controllers.
Wrong engine operating condition is likely cause of Yaroslavl air crash : Voice of Russia
This came in a statement for the Interfax news agency by a source in the law enforcement bodies.
A lead is now being followed up whereby the pilots may have failed to light the afterburner during the take-off run.
As a result, the plane failed to pick up the required speed due to insufficient thrust to gain height during the take-off.
The lead is proved by the fact that the pilots, when still on the runway, failed to report any technical problem to the flight traffic controllers.
Wrong engine operating condition is likely cause of Yaroslavl air crash : Voice of Russia
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A wrongly chosen engine operating condition may have been the likely cause of the recent crash of a YAK-42 airliner near Yaroslavl on the 7th of this month, a crash that claimed the lives of the local Lokomotiv hockey club team.
This came in a statement for the Interfax news agency by a source in the law enforcement bodies.
A lead is now being followed up whereby the pilots may have failed to light the afterburner during the take-off run.As a result, the plane failed to pick up the required speed due to insufficient thrust to gain height during the take-off.
The lead is proved by the fact that the pilots, when still on the runway, failed to report any technical problem to the flight traffic controllers.
Wrong engine operating condition is likely cause of Yaroslavl air crash : Voice of Russia
This came in a statement for the Interfax news agency by a source in the law enforcement bodies.
A lead is now being followed up whereby the pilots may have failed to light the afterburner during the take-off run.As a result, the plane failed to pick up the required speed due to insufficient thrust to gain height during the take-off.
The lead is proved by the fact that the pilots, when still on the runway, failed to report any technical problem to the flight traffic controllers.
Wrong engine operating condition is likely cause of Yaroslavl air crash : Voice of Russia
Light the afterburner?
Maybe there wasn't enough steam pressure in the catapult too... 
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Jetjock330, I don't think so. See the shadows. The sun is on the right in the video, making the shadow of the aircraft be a bit left (in the video). Yet the wing tip shadow is well clear of the fence line (the actual tip being more). Or did I watch a different video than you?
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Anodina (MAK head) said Interfax today, that no technical malfunction was recorded on FDR, plane was set and weigted correctly for takeoff (but omitted info about weigt distribution) and suggested that they will need simulation flight to make. CVR and recording from tower are still decoded.
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Brief translation from MAK web site 12-Sep.
1. Yak 42 ,reg.42434, was produced in 1993, had a total of 6500 hours,which is almost twice less it's specified life of 12000 hours.
2. Take off mass was below MTOW.
3. According to FDR data there were 14t of fuel, 8 of which were fuelled in Yaroslavl.( Quality check is still under investigation)
4. Before take off crew made Flight control check, all control surfaces deflected as required.
5. Weather at the airport including crosswind wasn't a factor influencing take off.
6. Engines were operating until impact.
7. Stabilizer and flaps were in take off position before take off.
8. There were no aircraft system failures recorded on FDR.
1. Yak 42 ,reg.42434, was produced in 1993, had a total of 6500 hours,which is almost twice less it's specified life of 12000 hours.
2. Take off mass was below MTOW.
3. According to FDR data there were 14t of fuel, 8 of which were fuelled in Yaroslavl.( Quality check is still under investigation)
4. Before take off crew made Flight control check, all control surfaces deflected as required.
5. Weather at the airport including crosswind wasn't a factor influencing take off.
6. Engines were operating until impact.
7. Stabilizer and flaps were in take off position before take off.
8. There were no aircraft system failures recorded on FDR.
Last edited by ron83; 13th Sep 2011 at 16:10.