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Istanbul taxi accident

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Istanbul taxi accident

Old 13th May 2018, 18:04
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Istanbul taxi accident


An Asiana Airlines Airbus A330-323 (HL7792) and a THY Turkish Airlines Airbus A321-231 suffered substantial damage in a ground contact accident at Istanbul-Atatürk International Airport, Turkey.
The A321 had arrived from Ercan as flight TK969 and arrived at the gate at 14:47 UTC. At the same time the A330 had commenced taxiing to the runway. Flight OZ552 was returning to Seoul, South Korea. While taxiing past the A321, the right hand wing tip impacted the the vertical stabilizer of TK969.
The A321's vertical stabilizer was knocked over entirely and the A330's wing tip sustained serious damage.

https://aviation-safety.net/database...?id=20180513-0
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Old 13th May 2018, 18:12
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In plain daylight and perfect visibility this really defies understanding...
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Old 13th May 2018, 18:30
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I don't think that visibility and daylight are important factors in such cases. You must follow the yellow taxi lines and as far as I know there is no rule which necessitates the cockpit crew to check the wingtips during taxiing. Is there?
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Old 13th May 2018, 18:44
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After closely inspecting the video I can say that this accident occured due to controller error.
Turkish Airlines aircraft is not moving but it is definitely not at the final parking position. There must be something with the jetway or something else. Ground control should not give the Asiana taxi clearance before its way is fully clear.
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Old 13th May 2018, 19:01
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Originally Posted by syamaner View Post
After closely inspecting the video I can say that this accident occured due to controller error.
Turkish Airlines aircraft is not moving but it is definitely not at the final parking position. There must be something with the jetway or something else. Ground control should not give the Asiana taxi clearance before its way is fully clear.
In many airports, the gates are not ATC responsibility. The aircraft gets handed over to ground handlers and anything that happens thereafter (delay in getting on stand etc.) is between the flight crew and ground crew, none of ATC’s business. ATC cannot see if an aircraft tail or wingtip is hanging out a bit far from potentially a few km away up in a tower. This is the responsibility of the commanders of taxiing aircraft.

Last edited by Una Due Tfc; 13th May 2018 at 21:29.
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Old 13th May 2018, 19:01
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Originally Posted by syamaner View Post
I don't think that visibility and daylight are important factors in such cases. You must follow the yellow taxi lines and as far as I know there is no rule which necessitates the cockpit crew to check the wingtips during taxiing. Is there?
The A321 has certainly stopped short, perhaps in the absence of ground staff to switch the stand guidance system on? I would also guess that the A330-300 wingtips are not visible from the cockpit. However, and assuming the crew had received taxi clearance, there are other clues when judging if clearance is assured.

The A330 isn't hanging about and, looking at the impact, I wonder if the A321 could be a write-off.
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Old 13th May 2018, 19:13
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Istanbul airport is working at 120% capacity.
i hate to fly there. Taxi is a nightmare.
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Old 13th May 2018, 19:25
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syamaner:
After closely inspecting the video I can say that this accident occured due to controller error
Luckily you're not (I hope) an accident investigator
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Old 13th May 2018, 19:35
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Please explain to me one single reason to taxi that fast on a 330 in close proximity to other aircraft
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Old 13th May 2018, 19:42
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Can somebody explain the spectacular, F1 lookalike, "jump-start" of the A330 ? Could it be he selected a much too high power setting until somebody figured out that brakes need the be released to achieve significant forward motion.
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Old 13th May 2018, 19:46
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Is there a rule where to stop if you get the 'stop short' signal (or the gate is not set/marshal not present)? There seem to be no markings on the apron for that.
The anti-collision lights could have gave it away for the 330 crew (most probably it was on but not seen on the video for the low frame rate).
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Old 13th May 2018, 20:11
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Originally Posted by readywhenreaching View Post
Can somebody explain the spectacular, F1 lookalike, "jump-start" of the A330 ? Could it be he selected a much too high power setting until somebody figured out that brakes need the be released to achieve significant forward motion.
I think you're watching someone recording a tv screen with a mobile phone. The video is paused for the first couple of seconds, then started which gives the impression of the A330 'jumping' forwards.

Aircraft often taxi 'half-way' on to a stand where the docking guidance system hasn't been turned off yet. My guess is, that's the reason the TK A321 was in the position it was at the time of collision. I suppose the idea is to clear the taxiway, but in places where space is scarce you may not have fully cleared the TWY until you're almost at final parking position. Perhaps it's time to evaluate the commonly seen practice of turning into a parking position, without active DGS or the presence of a marshaller.
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Old 13th May 2018, 20:31
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I've seen a post incident video from ground crew by the rear of the 321, quite an amount of the rear of the ac is out into the taxiway, so i'm surprised the 330 crew didn't see it. That said, if a crew can not taxi fully onto stand for whatever reason, they need to advise ATC soonest as they have now blocked the taxiway, simple. Syamaner, I see no ATC fault here, it is no issue for them to give taxi clearance to the Asiana if the Turkish has passed / is infront. If the whole length of the taxiway had to be fully clear, things would happen very very slow on any airport...
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Old 13th May 2018, 21:45
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OK, I've been out of the business for a few years, but it used to be that the RESPONSIBILITY for the SAFETY of the aircraft rested with the CREW. If in doubt, STOP.
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Old 13th May 2018, 22:09
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Originally Posted by syamaner View Post
After closely inspecting the video I can say that this accident occured due to controller error.
Turkish Airlines aircraft is not moving but it is definitely not at the final parking position. There must be something with the jetway or something else. Ground control should not give the Asiana taxi clearance before its way is fully clear.
That is not how things function at any airport I am aware of. If ground control at major airports only allowed taxi with assured clearances airport capacity would be cut in half or more.
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Old 13th May 2018, 22:27
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I think it unfair to blame anyone from this video. But we should consider how the airport was laid out and whether or not the Turkish Airbus was inside or outside the stand markings (that normally should exist). It would also be interesting to hear what taxi clearances were issued to aircraft in this vicinity and whether or not the ground controller responsible for this part of the airfield knew that the Turkish Airbus was not yet parked. I'd also like to know what speed the Asiana was taxying. With this information I might then start to form some opinion.

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Old 13th May 2018, 23:22
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In the US, separation on the ground is a joint responsibility between pilot and controller.
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Old 14th May 2018, 02:01
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Originally Posted by Chris Scott View Post

The A330 isn't hanging about and, looking at the impact, I wonder if the A321 could be a write-off.
I would suggest that the A321 will be easier to repair than the A330. Changing the Vertical stab is a fairly easy task (only held on by 6 bolts) - so as long at the fuselage fittings were not over stressed the only thing that will hold up repairs is finding a spare Stab.

The A330 damage to the front spar on the other hand.......
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Old 14th May 2018, 02:54
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Originally Posted by krismiler View Post
In the US, separation on the ground is a joint responsibility between pilot and controller.
can you provide appropriate documentation of this? There are many places with wide open spaces that are not ATC, nor ramp/apron controlled.


Think BNA to start.
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Old 14th May 2018, 03:51
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New Zealand Press report !!

An Asiana A330 plane was taxiing into the terminal when its wing crashed into the Turkish Airlines A321 causing the A330 tail to sever in half.
Whose tail ? Think about it !!
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