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Preliminary report into Air India crash released

bbc.co.uk

461–470 of 924 posts

Re: Preliminary report into Air India crash released

#461
post #72

it makes sense to me that the pilot who said "I did not do it" actually did do it without realizing it, was supposed to be putting the landing gear up when he committed a muscle memory mistake. it happened around the time the landing gear should be up, and this explanation matches what was said in the cockpit, and the fact that the landing gear wasn't retracted. I think this idea was even floated initially by the you…

Is there a video feed of the cockpit inside the black box? If not there should be one as even my simple home wifi camera can record hours of hd video on the small sd card. And If there is, wouldn't that help to instantly identify such things?

No neither black box stores video. One stores audio on flash memory and the other stores flight details, sensors etc.

I don’t think video is a bad idea. I assume there is a reason why it wasn’t done. Data wise black boxes actually store very little data (maybe a 100mbs), I don’t know if that is due to how old they are, or the requirements of withstanding extremes.

Re: Preliminary report into Air India crash released

#462

Earlier quoted context omitted.

> If it was an issue with the switches, we also would have seen an air worthiness directive being issued. I do not trust these air worthiness directives 100.0%. The 737 Max also required two catastrophic failures before it was grounded.

The issue with the 737 MAX became evident within months of the plane's launch. By contrast, the Dreamliner has accumulated over a decade of flying history across over 1000 aircraft with precisely zero fatal accidents.

Absence of evidence isn't evidence of absence.

The fact that the pilots denied that they had shut the switch (one asking the other why they had done so and the other denying it), and that they restarted the engines should be taken into account. Ok, murder suicide is definitely on the table but I would want to see some other reasons for believing that this is so.

Re: Preliminary report into Air India crash released

#463
post #372

Earlier quoted context omitted.

These switches are operated at startup and shutdown. So pretty much daily. By pilots and likely maintenance crews. Such a defect with not to unnoticed for long

It could have been unimportant to them

No it could not. Is your conclusion coming from a decade of piloting or maintaining commercial aircraft?

If not, why are you speculating with zero knowledge?

Re: Preliminary report into Air India crash released

#464

Earlier quoted context omitted.

> It's difficult to conclude anything other than murder-suicide. You're leaping into the minds of others and drawing conclusions of their intent. One of them moved the levers. It could've been an unplanned reaction, a terrible mistake, or it could've been intentional. We may never know the intention even with a comprehensive and complete investigation. To claim otherwise is arrogance.

> One of them moved the levers. It could've been an unplanned reaction, a terrible mistake, or it could've been intentional. Fuel levers are designed to only be moved deliberately; they cannot be mistaken for something else by a professional pilot. It's literally their job to know where these buttons are, what they do, and when to (not) push them. It's not arrogance to assume the most likely conclusion is true, despi…

The most likely scenario is not necessarily the truth. It still remains pure speculation and nothing else.

Re: Preliminary report into Air India crash released

#465
post #308

Earlier quoted context omitted.

There are reasons they don’t. This is a deceptively difficult problem Cost is a big one (satellite data is still quite a bit more expensive than you think, especially with many stations) And by stations, I mean aircraft. There are a TON. Current constellations probably wouldn’t even be able to handle half the current aircraft transmitting all at once. Bandwidth, in the physical sense, becomes a limiting factor Covera…

Most airplanes regularly crossing oceans already do have satcom. The cost of hardware and additional fuel consumption due to drag aren’t nothing, but the data used itself is essentially a rounding error. (Iridium for example has tiny antennas, and SBD data costs about a dollar per kilobyte, and position data is tiny.) Of course, that’s all little help when a pilot acts adversarial; on MH370, the breakers for both sat…

Yep. Inmarsat has this data for most of the world widebody fleet, and had it for MH370... except when transmission stopped. It's not publicly shared information, because that's what the ADS-B transponder they're all equipped with is for...

Re: Preliminary report into Air India crash released

#466
post #399

Earlier quoted context omitted.

I wonder if they could theoretically rest on top of the notch, not fully locked into either position and flip accidentally. No idea how the switches behave when not all the way up or down, but the notch looks pretty long and flat so it could be possible.

Something like this could maybe happen to one switch, it's unlikely but possible. But two independent switches at the same time?

Good point, that is very unlikely. I was just wondering if it's possible at all.

Re: Preliminary report into Air India crash released

#467

I just want to call out that, whatever the facts of this case, pilot heroism is way more common than pilot murder. This is off the top of my head, so don't quote me on the precise details, I'm probably misremembering some things. But a few of my favorite examples: - British Airways 5390: An incorrect repair causes the windshield of a plane to be blown out mid flight. A pilot is nearly sucked out. The head flight atte…

Here's another one:

Air Canada 143

- Pilot calculated incorrect fuel due to metric/imperial unit mixup, and ran out of fuel midair.

- Said pilot performed an impossible glider-sideslip maneuver to rapidly bleed airspeed just-in-time for an emergency landing at an abandoned airfield, having to completely rely on eyeballing the approach.

- No fatalties or serious injuries.

https://www.youtube.com/watch?v=jVvt7hP5a-0

Re: Preliminary report into Air India crash released

#469
post #380
post #336

It’s interesting to see how many people are bending over backwards here to avoid coming to the obvious conclusion. If this was pilot suicide, it’s a terrible thing. If it was somehow an error (which seems very unlikely) or two defective controls (which seems even more unlikely), then it remains a tragedy. But I don’t need to do mental gymnastics to come up with implausible hypotheticals. This comment stream on HN is…

It’s nowhere near an obvious conclusion. A failure with the locking mechanism or muscle memory confusion are just as likely, and probably other theories I’m not thinking of. More investigation is clearly needed, which is why this is called a preliminary report.

Dual failure of the locking mechanism is extremely unlikely. These are not switches that are regularly used so a muscle memory issue also seems very unlikely (but is still the most likely non-suicide scenario)

Re: Preliminary report into Air India crash released

#470

Earlier quoted context omitted.

Mentour Pilot is a fantastic channel.

Eh. His older videos are indeed phenomenal, but newer ones are "you won't believe what happened, right after this sponsor break"

In the particular case of his channel's subject matter, I actually kind of like the dramatic cliffhanger effect that (un)intentionally heightens the narrative's tension, since his video is telling a story. Compare to doing that for informational videos where there's no need for manufactured drama.
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