• deegeese@sopuli.xyz
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    2 days ago

    Looks like it stalled due to lack of thrust. What could have killed both engines right after takeoff?

    • Ilovethebomb@sh.itjust.works
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      1 day ago

      I was just thinking about this, perhaps when the aircraft rotated, water or other contaminants got drawn into the fuel system?

      Or shifting cargo damaged the fuel lines?

    • floofloof@lemmy.caOP
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      2 days ago

      It seems to climb OK for a little while then suddenly start sinking. There’s no sign of an obvious engine problem. Not sure whether we’d be able to see any sign of a bird strike from this far away.

    • philpo@feddit.org
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      2 days ago

      Yeah, it’s rather strange. There is another one from a perspective where the aircraft almost “overflew” the cameraman (basically at a 5’o clock angle)- it shows them having aileron and elevator control right until they crash. And while the quality is poor, I am somewhat convinced that the RAT has not deployed (yet?)

      A bird strike would likely have caused something visible So it doesn’t sound like hydraulics or fuel(water in the fueltanks?) or something electronic wise with the engine control. Strange and sad.

      • TranscendentalEmpire@lemmy.today
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        2 days ago

        I just saw that video and it is really strange. Not so much that rat hasn’t been deployed, I don’t think they lost hydraulics or electronics and I’m not sure they even reached the minimum speed where the rat would really help.

        The strange thing is that it didn’t really look like there was very much yaw or rolling which you would expect to see with a fuel system failure. They seemed to be flying straight as an arrow and gliding it down?

        Maybe something wrong with thrust control? Kinda crazy.

        • Supervisor194@lemmy.world
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          2 days ago

          Is it common for CCTV to track and follow all planes as they take off like the camera in this video seems to be?

        • philpo@feddit.org
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          2 days ago

          Yeah,I am not sure if there is a safety interlock with Boeing RATs(and the video is really bad)…so it might be intentional.

          It’s strange. Personally I currently go with water in the fuel system as the “most likely guess by a armchair pilot”(me),but wouldn’t also be surprised being it an electronic error. When that would be the case Boeing would be fucked beyond repair,imho.

          • torrentialgrain@lemm.ee
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            1 day ago

            Dude the plane is 13 years old. If there was a mechanical problem with the plane its on Air India, and I say that as a certified Airbus fanboy.

            • philpo@feddit.org
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              1 day ago

              No. Faults often don’t get detected early,need certain circumstances (swiss cheese model) or quite simply, are caused by replacement parts. There is a long chain of things that could fall into Boeing responsibility - and even if it doesn’t the market does not always react reasonably.

              • torrentialgrain@lemm.ee
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                1 day ago

                We will see I suppose. Your last sentence is most certainly true in any case but I will stand by the fact that after 13 years a mechanical problem will much more likely be due to bad maintenance- especially given AIs difficult track record in that regard.

                • philpo@feddit.org
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                  1 day ago

                  Yeah, absolutely, AI has issues- that’s why I narrowed my “Boeings fa**ult” down to electronics/software. There isn’t too much maintenance they can fuck up in that department that can kill both engines(afaik). In other parts like fuel,fuel distribution,etc? Totally different.

                  My bet is still on sometimes with the fuel, though. Maybe water in the fuel.

          • TranscendentalEmpire@lemmy.today
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            2 days ago

            Something wrong with the fuel system was my initial armchair guess, but I’m not so sure based off the second vid. One would expect to see some yaw or rolling in an underpowered or lost of power take off with a jet.

            Guess we’ll have to wait until someone more qualified explains it.

    • TranscendentalEmpire@lemmy.today
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      2 days ago

      For multi engine planes it’s pretty rare, most likely a fuel system failure, or less likely pilot throttling error. My money would be on something with the fuel system.

    • Treczoks@lemmy.world
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      2 days ago

      “Did I fill the water in the right hole on that plane?” – Guy at the airport driving the freshwater tanker.

    • gravitas_deficiency@sh.itjust.works
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      1 day ago

      Maybe, maybe not.

      What’s way weirder is that he’s got zero flaps and gear is still down, which is the exact opposite of what you want to do when climbing out. Maybe pilot error (control inversion)?

      • torrentialgrain@lemm.ee
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        1 day ago

        Slats are 100% deployed, you can see that in the videos, indicating the plane was in Takeoff Config. Now, the flaps themselves are hard to make out in the grainy videos and they don’t extend much on takeoff. Edit: https://imgur.com/a/JzS3ro9

        Much more important is the lack of engine noise. We can also see the rat turbine was automatically deployed, indicating a complete loss of power only seconds after they rotated. Which is also why the landing gear did not retract.

        I don’t know what could’ve caused a dual engine failure, simultaneously, immediately after takeoff but that seems to be where everything is pointing to. Possibly problems with the fuel?

        • thefartographer@lemm.ee
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          2 days ago

          Why not? Genuinely asking. I thought I remembered wake turbulence being able to cause engine stall or complete shutoff, but I only see that anecdotally, not on the FAA’s website.

          I also thought I’d remembered it being able to cause stalls, but I’m mostly only reading about it causing planes to roll on the FAA’s website.

          • philpo@feddit.org
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            2 days ago

            Wake turbulence requires something to cause the wake - usually another aircraft. Additionally wake turbulences autoregulate themselves - they don’t stay “in the air” but rather disperse rather fast, especially close to the ground. VAAH is a pretty small airport that has no continual taxiway(which they once had,for some strange reason) so aircraft need to backtrack(Basically go in the wrong direction on the RW, then do a U-Turn) at the end of the runway if they go for a take-off runway of RW23.This leads to a long time for any wake turbulence to disperse.

            Additionally the 787 is a mighty big aircraft and mostly wake turbulences affect aircraft that are smaller than the ones which caused it. (This is of course not fully accurate,but it gets complicated then) And the 787 is absolutely powerful enough to power through basically any wake turbulence.

            Last but not least there was not a starting aircraft directly before the flight but a (very small) landing one - so even more time for any wake to disperse.

            So in the end I would be pretty damn sure it wasn’t that.

  • JRaccoon@discuss.tchncs.de
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    2 days ago

    One theory circulating online is that the pilots may have accidentally retracted the flaps instead of the landing gear. Apparently that would result in kind of a flight path seen on the published videos.

    While this cannot be confirmed or ruled out with the information we have, in my opinion the available videos seem to kinda support this theory. Initially the aircraft appears to take off and climb normally, but for some reason the gear is not being retracted when usually it would be retracted right after the takeoff.

    Naturally the gear could be forgotten or left intentionally down if there were a dual engine failure right after takeoff, for example, but as the videos show no evidence of this, I’m more inclined to believe in simple pilot error.

    • null_dot@lemmy.dbzer0.com
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      1 day ago

      I’m not an expert, but pretty much every plane crash expert on the planet is watching the same footage and saying they don’t know what’s happened.

      It’s absurd to suggest the pilots accidentally retracted the flaps and no one figured that out yet.

      • JRaccoon@discuss.tchncs.de
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        1 day ago

        I don’t get what you mean by “and no one figured that out yet.” As you said yourself, no one knows what happened yet. Pretty much all we have at this point are the videos, and all we can confirm from them is a rough flight path of the plane and that the landing gear remained down after what appeared to be a normal takeoff. I haven’t seen any footage that clearly shows the state of the flaps with any certainty, but please correct me if I’ve missed something.

        In my mind, that leaves us with three possible scenarios:

        • Pilot error (retracting the flaps instead of the landing gear)
        • Dual engine failure at the critical moment (there’s no evidence of this in the videos, but also nothing ruling it out)
        • Something else (we don’t know what we don’t know)

        From the two scenarios (pilot error, engine failure) that fit the flight path from the videos, the option one seems more plausible to me. But that’s just my armchair opinion, it doesn’t mean anything. All we can really do is wait for the investigation and the preliminary report.

        • null_dot@lemmy.dbzer0.com
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          19 hours ago

          I don’t get what you mean by “and no one figured that out yet.”

          I mean there’s many experts watching the same footage who are not making an assertion that the pilots got confused about the landing gear and the flaps.

          • JRaccoon@discuss.tchncs.de
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            18 hours ago

            They’re also not saying it couldn’t have happened, are they? They’re waiting for investigators to gather all the facts before making any statements, just like they should.

            Meanwhile, we here on the internet are just speculating based on the limited information available (basically just the video footage). Based on the current information we have, my opinion is that pilot error is the most likely cause.

            You’re free to disagree about the likelihood of different scenarios, but right now we have no evidence that makes the theory of the pilots accidentally retracting the flaps instead of the gear impossible or “absurd.” It’s really counterproductive to start ruling out scenarios without concrete proof.

    • floofloof@lemmy.caOP
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      2 days ago

      I did see one person commenting on the other video that they could see the flaps were in the wrong position. And it is conspicuous that the landing gear was not retracted - though could that be because the pilots realized they were in trouble and would need to attempt a crash landing, or were too busy with whatever else had gone wrong?

      Are the 787’s controls arranged in such a way that you could accidentally retract the flaps instead of the landing gear?

      • Ilovethebomb@sh.itjust.works
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        1 day ago

        I think the simplest explanation, and the most likely one, is the pilots were too busy dealing with whatever shit was hitting the fan to raise the landing gear.

        And, in my view, that’s a loss of engine power for whatever reason, possibly bad fuel.

        • JRaccoon@discuss.tchncs.de
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          1 day ago

          According to type rated pilots the 787 doesn’t allow you to retract flaps immediately in critical flight after takeoff.

          That’s interesting. Do you have the source for that? I wasn’t able to find a definitive answer with google

      • JRaccoon@discuss.tchncs.de
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        2 days ago

        Are the 787’s controls arranged in such a way that you could accidentally retract the flaps instead of the landing gear?

        Not in a sense that someone could just grab the wrong lever in the dark for example. The levers are in different parts of the cockpit and also shaped very differently. But we humans can do all kinds of weird mistakes that are hard to explain. Almost everyone has experienced this sometimes. Think something like searching for you phone while it’s in your hand. Afterwards it’s very hard to explain why would anyone do such a silly mistake but it still happened. This would be similar.

      • JRaccoon@discuss.tchncs.de
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        1 day ago

        There are minimum airspeeds the aircraft must reach before the flaps can be safely retracted. I don’t know the exact numbers, but assuming a standard flaps 5 takeoff for B787, retraction to flaps 1 would occur around 1000 ft by earliest, that’s typically 20 to 30 seconds after the takeoff.

        • kcuf2@lemmynsfw.com
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          2 hours ago

          Also gear should probably be retracted first (though I don’t actually know for certain for this aircraft)

          • JRaccoon@discuss.tchncs.de
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            2 hours ago

            Usually the gear is retracted almost immediately after takeoff, as it creates a huge amount of unnecessary drag if left out when not needed.

            • kcuf2@lemmynsfw.com
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              1 hour ago

              Ya that’s true for multiengine in general. I just didn’t know if there was any other sequencing needed for the 787 (like move flaps from 5 to 4) because I know nothing about flying such large planes.

  • susi7802@sopuli.xyz
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    2 days ago

    I guess this is news, although it does little for me. Or for the people mourning the victims.