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Plane collision at Aberdeen Airport

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Plane collision at Aberdeen Airport

Old 19th Jun 2020, 16:28
  #21 (permalink)  
 
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tell me that chap IS trying to stop it by leaning on the radome
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Old 19th Jun 2020, 18:38
  #22 (permalink)  
 
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Originally Posted by The Fat Controller View Post
Interesting video. It looks like the Dash 8 was on 31 and the Embraer on 11, so the DHC rolled in a roughly eastward direction:




It doesn't appear that there was an engine run taking place, although there was clearly an engineer in the cockpit for some reason (who wisely abandoned ship when it clearly wasn't going to stop).

The METAR showed a light south-easterly surface wind, so that wouldn't have been a factor. But there is a discernable slope (downwards west to east) in the terrain between the Bristow apron on the western edge of the airport and the passenger terminal, so good old gravity may have played a part.
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Old 19th Jun 2020, 19:58
  #23 (permalink)  

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Originally Posted by DaveReidUK View Post
Interesting video....... so good old gravity may have played a part.
AAIB field investigation conducted by correspondence?
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Old 19th Jun 2020, 20:07
  #24 (permalink)  
 
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Looks to me they were possibly manoeuvring the aircraft a little bit by hand rather than using a tug? Hence the lack of chocks, 6+ people surrounding the aircraft etc.
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Old 19th Jun 2020, 20:26
  #25 (permalink)  
 
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Originally Posted by Maninthebar View Post
tell me that chap IS trying to stop it by leaning on the radome
Tell me I'm not the only one hearing the Benny Hill chase music when I watch that (somewhat sped up) video .

I guess I didn't know my speakers were off, because on re-viewing it actually does..

Last edited by Mad (Flt) Scientist; 20th Jun 2020 at 13:17.
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Old 19th Jun 2020, 20:28
  #26 (permalink)  
 
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Originally Posted by 750XL View Post
Looks to me they were possibly manoeuvring the aircraft a little bit by hand rather than using a tug? Hence the lack of chocks, 6+ people surrounding the aircraft etc.
It will come out in the wash. It was on a remote stand as as David has pointed out where a tug would not be required to see off the aircraft. One doesn't push to manouver a 20 tonne airframe unless as a last resort. Chocks should only be removed when the aircraft is ready to be moved or for engineering reasons as aircraft jacking for a wheel change or a maintenance proceedure. Here ends the CRM / HF lesson for today.
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Old 19th Jun 2020, 21:04
  #27 (permalink)  
 
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Originally Posted by parkfell View Post
AAIB field investigation conducted by correspondence?
I think we can safely assume it will be either, or neither.
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Old 19th Jun 2020, 22:00
  #28 (permalink)  

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Looking at the guys trying to stop it (?), there could have been a very nasty outcome.
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Old 19th Jun 2020, 22:27
  #29 (permalink)  
 
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Loads of us that are furloughed will have to get back in the zone that was very likely with those that were in the video. Currency for a lot of us that are professional fight crew, CC , Engineers and others has been serverly degraded in the last few months. Going back to work needs us to think and remind ourselves that we are not current.

Last edited by Cat Techie; 20th Jun 2020 at 20:41.
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Old 20th Jun 2020, 01:04
  #30 (permalink)  
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Thread drift... when I worked for deHavilland in the early '80's, Dash 8 number one, C-GDNK (named for DH Director Donald Kendal) was painted for its roll out. As with airplane things, there was a bit of a rush at the last minute, so we were there Sunday evening just after the final coat of paint went on. I was just hanging around, I had no actual role in preparing the plane for display. It was determined that the tug which had pulled the plane into the paint shop, could not easily be positioned back to push it out. So six of us, and one elderly painter carrying a set of chocks, pushed it out. Four of us each took a main wheel, and two more pushed on the main gear legs, as there was no other place to push on - new, and not cured paint. We couldn't quite get it over the hump of the hangar door tracks, but by then, the tug could be positioned to finish the job.

But yes, rolling any plane by hand, with no plan to stop it is a bad idea. And placing the chock under a wheel in motion is certainly hazardous!
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Old 20th Jun 2020, 01:26
  #31 (permalink)  
 
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My question is why the individual who was on the aircraft didn't jump into a seat and apply the brakes?
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Old 20th Jun 2020, 02:02
  #32 (permalink)  
 
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Originally Posted by DaveReidUK View Post
It looks like the Dash 8 was on 31 and the Embraer on 11, so the DHC rolled in a roughly eastward direction:
From Google Earth it appears to be a drop of 3m over 70m. This is 2.5 degrees. No real idea how reliable or accurate this measurement is.

I also checked across pad 31 and the slope is about the same all the way across but by then I had done the screenshot.



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Old 20th Jun 2020, 05:36
  #33 (permalink)  
 
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My question is why the individual who was on the aircraft didn't jump into a seat and apply the brakes?
The brakes use hydraulic pressure from engine-driven hydraulic pumps, with accumulators to maintain park brake pressure when shut down. But these Dash 8s have probably not moved since FlyBe stopped operating in March. Accumulators do not hold pressure indefinitely (which is one good reason why parked aircraft are chocked).
if the accumulator was depressurised, the brakes would not operate until the engines were turning, or the accumulator was recharged with a ground hydraulic rig.
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Old 20th Jun 2020, 06:30
  #34 (permalink)  
 
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Great to have some serious intelligent conversations on the mishap instead of the usual aircraft crash vultures!
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Old 20th Jun 2020, 12:13
  #35 (permalink)  
 
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Would be interesting to know when the chocks were removed and by who, or was it parked up without them and these guys set things in motion..The video will hopefully have the evidence for that.
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Old 20th Jun 2020, 16:03
  #36 (permalink)  
 
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The airport authority have everything they need to investigate. I am not rated on the Q400 and while I know the likes of a Jetstream 41 has no standby electro pump, am surprised the Q400 has not. Then again my other ratings are regionals where standby hydraulic power is highly desirable or essential.
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Old 20th Jun 2020, 16:09
  #37 (permalink)  
 
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Originally Posted by Pilot DAR View Post
Thread drift... when I worked for deHavilland in the early '80's, Dash 8 number one, C-GDNK (named for DH Director Donald Kendal) was painted for its roll out. As with airplane things, there was a bit of a rush at the last minute, so we were there Sunday evening just after the final coat of paint went on. I was just hanging around, I had no actual role in preparing the plane for display. It was determined that the tug which had pulled the plane into the paint shop, could not easily be positioned back to push it out. So six of us, and one elderly painter carrying a set of chocks, pushed it out. Four of us each took a main wheel, and two more pushed on the main gear legs, as there was no other place to push on - new, and not cured paint. We couldn't quite get it over the hump of the hangar door tracks, but by then, the tug could be positioned to finish the job.

But yes, rolling any plane by hand, with no plan to stop it is a bad idea. And placing the chock under a wheel in motion is certainly hazardous!
They had no intention of it moving without the engines running. However things were done that should not have been and gravity took over . Whatever a massive cock up.

Last edited by Cat Techie; 20th Jun 2020 at 20:38.
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Old 20th Jun 2020, 22:56
  #38 (permalink)  
 
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What I don't understand is why the guy in the cockpit jumped out, rather than trying to use the rudder pedals or tiller and steer the aircraft onto the grass. It would have been a lot better to have one aircraft with a wheel stuck in the mud, than to have what happened.
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Old 20th Jun 2020, 23:21
  #39 (permalink)  
 
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Given that both the rudder and steering, (along with the brakes) require hydraulic pressure to operate it wouldn't have made any difference.
Might as well be a spectator outside as be one inside.
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Old 21st Jun 2020, 03:53
  #40 (permalink)  
 
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The Q400 has a hand pump in the right landing gear bay to pump up the brake accumulator. Nothing could be done in the cockpit once the aircraft started to move.
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