Serious aeroplane crash

[klondike]

Just looking at the flight path in that suggests no power although no lift would fit too. It's why both engines should stop that is the big mystery. On the loss of fuel idea doesn't the fuel come from wing tanks and wouldn't each have its own? This is plain speculation as I have no idea. Maybe hydraulic failure left the landing gear down and the flaps insufficiently extended. Could speculate forever just from videos.

I saw another one still speculating on flap settings but found that RAT suggestion more convincing.

[Mups]

Here was another accident in the making -



An Air India Boeing 787-8 Dreamliner had to return to Hong Kong mid-flight after a suspected technical issue.

An Air India Airlines Boeing 787-8 Dreamliner. File pic: Reuters© Reuters
The passenger jet - the same type as the aircraft involved in last week's tragedy in Ahmedabad - was bound for New Delhi but turned back after the pilot raised suspected an issue, an Air India spokesperson told Sky News.
It's not yet known what the suspected technical issue flagged by the pilot.

[klondike]

From bits I've seen the aircraft type has an excellent safety record. I wouldn't  bet on anything but would suspect either a human error or deliberate act over a systems problem but of course there is always a first for every aircraft. Take off and landing are always the danger times as there is so little time to correct a problem.

[Alex]

Then there's the Indian tanker on fire at sea, plus 3 oil tanker trucks were on fire next to Indian Oil's Amausi bottling plant.  These events could be coincidence of course.


Times of India

[Vlad]

I read earlier today that the only survivor has been arrested by the Police , kinda odd

[klondike]

I read earlier today that the only survivor has been arrested by the Police , kinda odd

I sometimes wonder if I'm living in a simulation. One that was written by a ten year old still learning...

[GrannyMac]

I read earlier today that the only survivor has been arrested by the Police , kinda odd

Facebook crap.  No truth in the rumour. 

https://newschecker.in/fact-check/survivor-of-ahmedabad-plane-crash-arrested-no-fake-claim-goes-viral

[klondike]

I sometimes wonder if I'm living in a simulation. One that was written by a ten year old still learning...

I was almost right then...

[Scrumpy]

Idiots write it.. for idiots to believe it...

[Ashy]

Well apparently the Indian air accident investigators have presented a preliminary report, which at present is somewhat inconclusive. They are saying that the fuel control switches had been moved to the cut-off position. It's not clear to me whether this was sabotage or part of a procedure for a failed engine, there is evidence for the failure procedure. The Ram Air Turbine could have been deployed as part of the procedure for a dual engine failure.

[klondike]

It clearly can't be the case or the report wouldn't be pointing to those switches but if have thought in these days of fanatical safety requirements and electronic everything  i'd have thought that those switches being turned off with the aircraft airborne would at least have produced an alarm and I'm assuming there was no mention of one or it would be headlines.

[Ashy]

The report can be read here. (It's in English)

Commentators have pointed out that the switches were moved to cutoff and back to run, and this was recorded by the flight data recorders. This is referred to at the end of the preliminary report on pages 14 and 15.

At this stage the reader can only draw his own conclusions.

[klondike]

So could have been some part of a recovery procedure? A lot would depend on when they were turned off exactlly, state of systems at that point and how long they were off.

Thanks for the link to the report. Not sure I know enough to have any chance of understanding it or making any valid guesses as to what it all means.

This bit suggests to me that it maybe was pilot error because the RAT deployed when the switches were off with no suggestion of any other reason for it deploying


The aircraft achieved the maximum recorded airspeed of 180 Knots IAS at about 08:08:42
UTC and immediately thereafter, the Engine 1 and Engine 2 fuel cutoff switches transitioned
from RUN to CUTOFF position one after another with a time gap of 01 sec. The Engine N1
and N2 began to decrease from their take-off values as the fuel supply to the engines was cut
off.
In the cockpit voice recording, one of the pilots is heard asking the other why did he cutoff.
The other pilot responded that he did not do so.
The CCTV footage obtained from the airport showed Ram Air Turbine (RAT) getting deployed
during the initial climb immediately after lift-off (fig. 15). No significant bird activity is observed
in the vicinity of the flight path. The aircraft started to lose altitude before crossing the airport
perimeter wall.

As per the EAFR data both engines N2 values passed below minimum idle speed, and the
RAT hydraulic pump began supplying hydraulic power at about 08:08:47 UTC.

As per the EAFR, the Engine 1 fuel cutoff switch transitioned from CUTOFF to RUN at about
08:08:52 UTC. The APU Inlet Door began opening at about 08:08:54 UTC, consistent with
the APU Auto Start logic. Thereafter at 08:08:56 UTC the Engine 2 fuel cutoff switch also
transitions from CUTOFF to RUN. When fuel control switches are moved from CUTOFF to
RUN while the aircraft is inflight, each engines full authority dual engine control (FADEC)
automatically manages a relight and thrust recovery sequence of ignition and fuel introduction.
The EGT was observed to be rising for both engines indicating relight. Engine 1's core
deceleration stopped, reversed and started to progress to recovery. Engine 2 was able to
relight but could not arrest core speed deceleration and re-introduced fuel repeatedly to
increase core speed acceleration and recovery. The EAFR recording stopped at 08:09:11 UTC

[Ashy]

Almost certainly caused by action by the flight crew but this is still speculation, as we know what happened but we don't know why. The engines were both shut down as the aeroplane was taking off. Once the switches were returned to the run position the engines were automatically restarted, and although they both established firing, only No.1 engine started to speed up. There was still not enough time for the engine to develop thrust; if it had done the flight would almost certainly have been saved, but it was too close to the ground.

Juan Brown has published his analysis without hysteria and fancy uniforms.

 

[klondike]

Taa. Will give it a look. There has been one hell of a lot of speculation - greedy click bait mostly.

Hmmm. Seems those switches could be in the wrong place unless it's standard on all jets. I would have thought that they'd be well out of the way of frequently used flight controls as they'd normally only get used twice a flight. Also surprised the check on the protection mechanism isn't mandatory as they seem to have been reported as iffy.