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Squawk7700
June 17, 2025, 10:28:00 GMT permalink Post: 11904180 |
Perhaps?
"LNAV" - "VNAV" or "FLCH SPD" To ensure:
Subjects (links are to this post in the relevant subject page so that this post can be seen in context): Engine Failure (All) TOGA |
Squawk7700
June 17, 2025, 10:32:00 GMT permalink Post: 11904185 |
"On Jun 17th 2025 an official, a former Air India Captain trained by the Captain of the accident flight, stated, that the CVR has been successfully read out, the voices on the CVR are very clear. It is becoming gradually clear from the newly emerging evidence that there was probably zero negligence in the cockpit, the crew did not give up until the very last moment. The probability of a technical cause is high. A preliminary report by India's AAIB can be expected in a few days."
AvH This comment is from a low-budget news source. Subjects (links are to this post in the relevant subject page so that this post can be seen in context): AAIB (All) CVR Preliminary Report |
Squawk7700
June 17, 2025, 12:33:00 GMT permalink Post: 11904262 |
Subjects (links are to this post in the relevant subject page so that this post can be seen in context): RAT (All) RAT (Deployment) |
Squawk7700
June 17, 2025, 23:16:00 GMT permalink Post: 11904753 |
Not impling; but merely asking if it were possible. * Disclaimer - It is unkown if these statistics take into account the barometric pressure at the time. Subjects: None |
Squawk7700
June 17, 2025, 23:26:00 GMT permalink Post: 11904762 |
I assume (rightly so) that you're focused on what could cause them to fail at what appears to be the exact same time given the absence of yaw and any correcting rudder input. One the face of it, it could only be throttle or fuel supply, with fuel supply only being able to be cut off by valves so abruptly. Any kind of blockage or similar wouldn't give such a result, even if there was a low fuel condition, short of the pickups being exactly right next to each other, presumably that wouldn't give the outcome we've seen. Subjects (links are to this post in the relevant subject page so that this post can be seen in context): Fuel (All) Fuel Cutoff Fuel Cutoff Switches |
Squawk7700
June 17, 2025, 23:29:00 GMT permalink Post: 11904765 |
The gag rule is pretty much the first thing you're told when you get drawn into an investigation - and you can get in big trouble for violating it (even if inadvertent).
A Boeing management type got his hand slapped pretty hard not to long ago when he made the mistake of answering a reporter's question regarding the Alaska door plug blowout. I was tempted to contact my friend who was my counterpart during the 787/GEnx-1B development, but I suspect he's already been contacted and is considered to be part of the investigation - so he couldn't talk to me about it anyway. Subjects: None |
Squawk7700
June 18, 2025, 03:53:00 GMT permalink Post: 11904874 |
Real time data reporting of performance by engines and a/c systems.
How much data might Boeing and the engine manufacturers have had access to prior to any electrical interruption. How much of such data flow is forwarded in real time to airline integrated operations centres? Short of the long would any of these entities have access to data that could substantially point them in the direction of isolating a cause even before the black boxes are read and transcribed. Subjects: None |
Squawk7700
June 18, 2025, 04:58:00 GMT permalink Post: 11904909 |
There was talk back then that Boeing were going to cop the costs for this moving forward, however [I believe] that it's still dependent on the operator to pay the Imarsat sub.
Last edited by Saab Dastard; 18th June 2025 at 18:25 . Reason: ChatGPT reference removed Subjects: None |
Squawk7700
June 18, 2025, 05:02:00 GMT permalink Post: 11904910 |
For a Boeing 787 (typically equipped with either GE GEnx-1B or Rolls-Royce Trent 1000 engines), the spool-down time from full takeoff power to idle is generally around 4 to 7 seconds.
Subjects: None |
Squawk7700
June 18, 2025, 23:23:00 GMT permalink Post: 11905616 |
I haven't read anywhere where the yaw to the right was noticed not that long after takeoff? I'm assuming this was due to the roll-back.
About 9 seconds after wheels-up it's clear that power is well and truly deminishing. 17 seconds after wheels-up, there's a defined yaw to the right. It looks like the right engine power is lost, a yaw to the right occurs and immediately after, the aircraft pitches up, potentially due to elevator input and subsequently some left rudder. It gives some credit to the theory that one engine was lost. I can only assume that the associated yaw from a lost engine would be significant, so on the face of it, it doesn't look severe enough, but it does look somewhat upset. Subjects: None |
Squawk7700
June 19, 2025, 00:00:00 GMT permalink Post: 11905628 |
Maybe both engines didn't shut down absolutely sychronously. In the fly-by video a bit later not even a little bit asymmetry is visible. The rudder is straight and no bank whatsoever. That would also explain why the yaw is very small - a second later the other engine had failed as well.
Subjects: None |
Squawk7700
June 19, 2025, 02:09:00 GMT permalink Post: 11905673 |
Do the critical engine control systems run on 5g frequencies?
"Consumer 5G phones do not emit enough power or operate on the right frequencies to bring down a commercial airliner like the 787. Aviation systems are built with much stricter tolerance and protections." Millions of flight hours unaffected by mobile phones are a testament to this statement. Last edited by Saab Dastard; 19th June 2025 at 10:43 . Reason: Reference to chat GPT removed Subjects: None |
Squawk7700
June 19, 2025, 04:18:00 GMT permalink Post: 11905707 |
\x93Mayday\x85 mayday\x85 mayday\x85 no thrust\x85 losing power\x85 unable to lift.\x94 Is the cleared altitude available from the ATC tapes and could it have been 2,000 or 20,000 perhaps? Subjects: None |
Squawk7700
June 19, 2025, 09:05:00 GMT permalink Post: 11905850 |
I lost my pitot input on my last flight and my auto-pilot started a set of uncontrolled pitches, so I disabled and hand flew. I would have never expected that behaviour. It has a speed tolerance with minimum speed, however it was nowhere near that threshold. Subjects: None |
Squawk7700
June 20, 2025, 11:20:00 GMT permalink Post: 11906855 |
There are numerous pictures ot the outside of B787 centre tanks on the net. Does anyone one have any internal pictures, showing the tank floor and fuel pump pick ups?
We know the engines lost power in the initial climb, shortly after rotation. If there was water sitting between the tank lower skin stringers, the rotation would have been the point that the water could tumble over the stringers that were previously preventing its movement. accumulate at the back of the tank and enter both pumps more or less simultaneously. In a well designed boat, you'd have each engine feeding from a different tank for the utmost in redundancy, but seemingly not so in all aircraft. Subjects (links are to this post in the relevant subject page so that this post can be seen in context): Centre Tank Fuel (All) Spar Valves |
Squawk7700
June 20, 2025, 11:34:00 GMT permalink Post: 11906868 |
Interestingly enough on Airbus aircraft even when there\x92s fuel in the centre tank the centre tank fuel pumps are switched off automatically after the flaps are extended for takeoff and each engine is fed by its respective wing tank for takeoff. Surprised it\x92s not the case for Boeings
Subjects (links are to this post in the relevant subject page so that this post can be seen in context): Centre Tank Fuel (All) |
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