If there was a software issue, 787's globally would have likely been grounded, they've had the FDR for over 2 days now so I would imagine they have some inkling as to what happened. It does sound to me as if the engines are not providing enough trust, a 787 at TO speed is much louder than you can hear in the video.
Air India Crash
- Thread starter Grim5
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I'm not saying you are wrong.
But just making a point that microphones and therefore the resulting sound from mobile devices and CCTV cameras etc are notoriously terrible.
I've occasionally filmed guns going off at close range with my phone, and sound of the guns going off, no where near resembles what it's like to hear it yourself, not even close.
They tend to "normalise" a lot of the sound.
Soldato
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Well, I wasn't assuming the engines failed. Rather I was wondering if the time between the initial systems failure and the RAT deployment was enough to present the pilots with an irrecoverable situation. I mean it really was a critical time when it happened. They literally had seconds to sort things out. Or does the RAT really deploy that fast? The software is a very dramatic option. Sheesh, that would cause trouble. Then so would a deliberate act by the pilot. Whatever, the timing does seem contrived. It would not surprise me at all if this was a deliberate act. If it's software then God help BOEING, because they are going to need it.
Rat deployment is a few seconds.. it’s fast and automatic to give the maximum time to recover to the pilot.
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So this is where the PR/blame game starts and we should start being sceptical about who says what. "Government official" could very well be starting the arse-covering for their national carrier, shifting the narrative towards a Boeing failure (which would be quite believable to many given the recent troubles). We still have news outlets saying the plane reached 650ft even though that was uncompensated data from FR24, for example.
Given the 737 Max debacle I wouldn't be too sure. 2 days is probably to early to have done a proper analysis anyway - it's likely the expertise to do so does not exist in India and the boxes will be shipped to the US.
Just add, if it's not clear - one way to kill the engines is to pull the fire handles, it should shut off all the fuel valves, isolate the hydraulic system, and I believe, disconnect the electrical generators from the electrical bus. It's a single handle for each engine.
Achieving pretty much the same as pulling the fuel cutoff levers. Either way, irrecoverable at this height.
Not if they've done the performance calculations properly. Every take-off (and landing) is calculated according to aircraft weight, runway length, temperature, atmospheric pressure etc etc, to ensure the runway length is sufficient and that the aircraft can meet an appropriate climb gradient on both one or two engines. It should be done independently by each pilot and then cross checked in some way. Not doing this correctly has been the cause of numerous accidents in the past. Every airline I have worked for has had strong procedures in place to ensure it's done correctly.
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Irrecoverable for sure, but the fire handles have wider implications for other AC systems as opposed to the fuel shutoff, which will just cut fuel to the engines.
Or at least various aircraft systems will fail at a different rate in however either case but I wouldn't be sure of the details. I'm basing most of this stuff of the B737 which I'm familiar with and assuming there will be some crossover to the 787.
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If it's this then it's going to be huge....
Possibly the breakup of Boeing as a company.
Thank you for the reply.
I kind of guessed much would go into taking off and the like and guess a sudden drop/rise in pressure would be picked up pretty quickly.
Are the engines still supplied by RR
RR and GE for the 787. GE in this case.
Soldato
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I believe maybe so but this was in reference to a software failure.
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I believe Boeing, like many companies, has come under fire for farming out some of it's software development and testing to third partly contactors internationally, as opposed to doing it in house as they used to. It's not my area but I imagine many people on this forum have seen the negative impact of that in other, different fields.
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If true and if they mean calculated for that aircraft at that weight, on that day, it would not be normal and could point to incorrect performance calculations. Or a problem with the auto throttle setting the correct thrust.
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I'll stick to blancolirio on youtube, captain Steve knocked out a quick video early on for clicks without any facts and is now backtracking.