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Saudi Airline B777-300

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Saudi Airline B777-300

Old 4th May 2013, 15:03
  #41 (permalink)  
 
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ATC clearance received, headset disconnected, bit of distraction, easy to do...
Do the checklist before calling for a taxi clearance...
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Old 4th May 2013, 16:39
  #42 (permalink)  
 
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Do the checklist before calling for a taxi clearance...
Yes, definitely. Our SOPs have been rewritten many times over the years to try and stop this happening. However, I have been given taxi clearances before requesting them by keen controllers over the years.

It's the same as ending up on the runway with no flaps for takeoff or lining up without clearance: shouldn't happen but it does, even with the best of intentions and lots of checklists. Multiple distractions can catch even highly disciplined operators...
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Old 4th May 2013, 16:53
  #43 (permalink)  
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I think Capn Bloggs lives in a perfect world!
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Old 4th May 2013, 18:16
  #44 (permalink)  
 
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Edited Google translation of description on video:
Collided yesterday afternoon April 28, 2013 aircraft of Saudi Arabian Airlines new Boeing 300-777 Registration number HZ-AK16

Vehicle rear of the plane (Push Back) during the readiness for a trip No. 1036
and the takeoff time (3) at noon heading to King Khaled International Airport in Riyadh

After that was the pilot or his assistant run the engine (2), and Over Speed ​​and break tow bar and push back vehicle collided, causing serious damage to the aircraft engine

Note that the investigations are still going on

Why were repeated incidents in Saudi Arabian Airlines recently, including the lounge car accident lines and now a new aircraft? .. Is it the fault of the pilots studying at their own expense and who refused stubbornly and injustice?
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Old 4th May 2013, 23:31
  #45 (permalink)  
 
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A simple explanation might be an attempt to taxi with the tug still
attached.
Fullwings,

No, I don't think so. The available evidence in post 5 and now backed up by post 44 indicates clearly that the nose gear was forced to port against the braked tug, leaving skid marks almost worthy of the tug driver's underpants. Most likely cause of this is substantial assymetric thrust. Every picture tells a story if you look. Check post 32.
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Old 5th May 2013, 00:24
  #46 (permalink)  
 
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No, I don't think so. The available evidence in post 5 and now backed up by post 44 indicates clearly that the nose gear was forced to port against the braked tug, leaving skid marks almost worthy of the tug driver's underpants. Most likely cause of this is substantial assymetric thrust. Every picture tells a story if you look. Check post 32.
Why does it have to be asymetrical thrust?

Symetrical thrust from the engines coupled with asymetrical friction loads at the nose (at very low speeds) might suffice as well.
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Old 5th May 2013, 01:08
  #47 (permalink)  
 
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Originally Posted by BOAC
I think Capn Bloggs lives in a perfect world!
You think wrong, sunshine...
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Old 5th May 2013, 02:35
  #48 (permalink)  
 
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If the brakes were set, it's unlikely that the aircraft would move, especially with a tug still attached, therefore it's a reasonable assumption that someone had deliberately released them. That is generally done when you want to taxi away...

The only other scenario I can think of is the tug driver not asking for the brakes to be set at the end of pushback and a crossbleed start needing more power on the left engine. Not incredibly likely plus the aircraft would have to travel a fair distance to impact the tug, if it started from the normal towing position - one would have hoped someone would have noticed something amiss before a collision occurred.

You can rotate the 777 around one main gear with lots of power for a minimum radius turn in extremis but it needs the brakes held on one side and released on the other otherwise it's not going anywhere.

Edit: One other possibility - the towbar sheared with the engines running and the aeroplane overran the tug?

Last edited by FullWings; 5th May 2013 at 02:43.
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Old 5th May 2013, 22:32
  #49 (permalink)  
 
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Read post #38

HINT - You can stop guessing. The actual event is known.

The #2 engine went well above idle during the pushback.
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Old 6th May 2013, 11:08
  #50 (permalink)  
 
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Any guesses why #2 went above idle?
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Old 6th May 2013, 11:40
  #51 (permalink)  
 
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reasonable assumption that someone had deliberately released them. That is generally done when you want to taxi away...
have you considered that the brakes must be released during pushback?

why does it have to be asymmetrical thrust
because only 1 engine is started at a time.

I love the comment attached to the Arabic video, questioning if this is because pilots now have to pay to get their CPL/ME/IR......
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