Page Links: Index Page
| Ver5pen
January 24, 2026, 18:30:00 GMT permalink Post: 12026533 |
Non-paywalled version:
https://www.aol.com/articles/sabotag...060100148.html
There's the old "the RAT deployed early" (assuming it always takes a full 6 seconds to spool up), the water leak, the "can't move both switches in a second", and new "the aft FDR looks like it burned before the crash". And this, which is as yet unsubstantiated, and is likely not relevant at all:
Just 15 minutes before take-off, the aircraft\x92s bus power control units (BPCUs), which manage the electrical systems, sent real-time signals to Boeing and Air India indicating malfunctions with both BPCUs.
In isolation, none of these problems is classed as major issues, but taken together, according to some experts they show a pattern of electrical problems that point to issues with the core network.
According to reports in India, in the minute before the aircraft took off, and almost certainly as it was heading down the runway, the 787\x92s aircraft communications addressing and reporting system sent a fault code to Boeing and Air India which indicated that the Fadec was receiving corrupted data from an engine monitoring probe.
Pierson says: \x93That aircraft was sending out fault messages before it took off. That is a big red flag. The aircraft health management system was also sending real-time data to Air India and Boeing so they had that information before the fires were even put out. None of that information was included in the preliminary report.
I still don\x92t believe we have got a clear answer on the recording interval of the engine cutoff switch channel, if it\x92s 1s then the \x91debunking\x92 by saying it can be done very quickly is moot as (near) instant would record as 1s I believe and the RAT element is obviously very relevant, if RAT deployment is not recorded then one has to infer when it deployed based on when it delivered hydraulic/electric capability. And this will come down to counting seconds, any indication that the RAT may have deployed before the fuel cutoffs were recorded as moved is obviously hugely consequential it\x92s easy to dismiss these narratives as vested interests but let\x92s be honest everyone has a vested interest here and blaming the pilots has been the go to when in doubt for a very very long time- probably as long as aviation has existed in the absence of explicit evidence (does the CVR have more to tell?) of deliberate action or pre-planning this is a horrifically complicated investigation as there will always be plausible deniability on all sides and different courts/judges will rule on it very differently based on their own biases and views Subjects
CVR
FDR
Fuel (All)
Fuel Cutoff Switches
Preliminary Report
RAT (All)
RAT (Deployment)
Reply to this quoting this original post. You need to be logged in. Not available on closed threads. |
| Ver5pen
February 02, 2026, 14:19:00 GMT permalink Post: 12031107 |
Having operated this type of switch for about a half century, I am unconvinced that a properly selected switch could "move towards the cutoff position".
From post 166 of this thread: Perhaps the switch could be defective, but that is (a) easily detectable by the pilot) and (b) still not likely to result in it moving on its own, rather just not locking well in the selected position. This is a situation where readers need to apply their understanding before accepting an unsubstantiated report. If we receive an authoritative report about how this switch "moved toward cutoff" twice on its own, I will read with great interest! are we saying that crew don\x92t know how to operate these switches? The first time one could argue they didn\x92t seat it properly but the second time? I would assume all 787 (particularly air india) are VERY sensitive and deliberate with this particularly switch post 171 the plane is now grounded by the airline so something happened Subjects
AvHerald
Fuel (All)
Fuel Cutoff Switches
Reply to this quoting this original post. You need to be logged in. Not available on closed threads. |
| Ver5pen
February 02, 2026, 14:27:00 GMT permalink Post: 12031113 |
Subjects: None 1 recorded likes for this post.Reply to this quoting this original post. You need to be logged in. Not available on closed threads. |
| Ver5pen
February 02, 2026, 14:46:00 GMT permalink Post: 12031123 |
Subjects: None 1 recorded likes for this post.Reply to this quoting this original post. You need to be logged in. Not available on closed threads. |
| Ver5pen
February 02, 2026, 14:52:00 GMT permalink Post: 12031127 |
sounds like they discovered the issue on engine start, reported the issue and carried on the flight to their home base where the aircraft is AOG for maintenance related activities
Subjects: None No recorded likes for this post (could be before pprune supported 'likes').Reply to this quoting this original post. You need to be logged in. Not available on closed threads. |
| Ver5pen
February 02, 2026, 15:16:00 GMT permalink Post: 12031137 |
I'll answer my own question.
According to FR24. The aircraft took off 35 minutes late. So we are being led to believe that a potentially critical system failure was observed during engine start, subsequently ignored, the aircraft operated it's scheduled service back to India. Alternatively, the #1 fuel cut off switch was replaced, system checks, including an engine start, performed and certified, all in 35 minutes or less? I smell a rat. and they continued on with no other dramas to their home base where the plane is now in the hands of maintenance clearly *something* happened as I don\x92t think airlines are on the habit of grounding their $300m airliners for no reason. i remember when the consensus was this issue (fuel cutoffs not seating properly) was nearly impossible yet this crew found differently. maybe we should discuss new information on the merits of that and not frame everything as x party trying to shift blame this is certainly noteworthy even if it ultimately has nothing to do with 171 Subjects
FlightRadar24
Fuel (All)
Fuel Cutoff
Fuel Cutoff Switches
Reply to this quoting this original post. You need to be logged in. Not available on closed threads. |
| Ver5pen
February 02, 2026, 18:44:00 GMT permalink Post: 12031266 |
the same fleet operated by the same airline I still think intentional action is the most obvious explanation but that will never be 100% concrete without definitive evidence (a note or previous suicidal ideation) air India was hardly known to be a beacon of maintenance standards prior to their takeover by TATA and like a super carrier the ship takes a long time to turn around, their legacy fleet that they inherited was known to be particularly troubled. Google air india and spares and you\x92ll see they had a huge % of their fleet grounded for lack of support prior to TATA taking them over \x91Until pressed down slightly\x92 Thisraises my eyebrow at least. So they appear functional until externally interfered with? I imagine 787 drivers and certainly AI crew today manipulate the fuel cutoffs when doing engine start ever since 171, I certainly do on the Bus ever since this incident to make sure it\x92s seated properly. hence it was picked up this time but was it before? So a hand behind the TL or placing their hand back on or any other thing in that area that places pressure on those switches at the wrong moment. Wasn\x92t there an Atlas 767 that we speculate was lost because of an oversized watch (combined with sheer incompetence)? again, I reiterate the most likely explanation is pilot suicide but can we rule out everything else? Extraordinary claims require extraordinary evidence and that goes both ways. Subjects
Fuel (All)
Fuel Cutoff Switches
Reply to this quoting this original post. You need to be logged in. Not available on closed threads. |
| Ver5pen
February 03, 2026, 13:37:00 GMT permalink Post: 12031596 |
I don't know of a professional pilot in his right mind that would have continued the flight having experienced the (alleged) issue with the start switches, and the calmly continued. Had the crew returned to stand and brought the issue to their (impartial) third-party UK engineers it would have added quite a lot of weight to AI's assertion that there was a wider problem with this aircraft. Instead they elected to continue to BLR where they dropped this bombshell in the tech-log.
Sorry, I don't have that much faith in coincidences. This was a clumsy and rather transparent attempt to discredit the 787, further muddying the waters of the AI171 investigation and shifting blame away from Air India. On the third attempt the switch seated correctly and remained there Are you saying air india pilots are fabricating these things now? That\x92s quite the claim So the Indians are spreading conspiracy theories by pointing fingers at Boeing but what exactly is this you are suggesting? Good faith fact based analysis? This is almost wilder than anything I\x92ve heard from the most rabid Indian media report Subjects
AI171
Reply to this quoting this original post. You need to be logged in. Not available on closed threads. |
| Ver5pen
February 03, 2026, 13:58:00 GMT permalink Post: 12031613 |
Subjects: None No recorded likes for this post (could be before pprune supported 'likes').Reply to this quoting this original post. You need to be logged in. Not available on closed threads. |
| Ver5pen
February 03, 2026, 14:42:00 GMT permalink Post: 12031649 |
Subjects
RUN/CUTOFF
Reply to this quoting this original post. You need to be logged in. Not available on closed threads. |
| Ver5pen
February 03, 2026, 14:52:00 GMT permalink Post: 12031660 |
We already have several threads on AI171 issues (at least one of them in
Tech Log
), so moving this discussion to its own thread seems unproblematic.
The significance of this new finding is that it makes accidental movement more likely. We already know about the incident where a sun visor fell and moved the switch. We are learning now that the mechanism of "pull up, then move the switch" can be circumvented, and that the switch can be moved by a single application of force. It appears that the engineers were able to reproduce this behaviour, so it's no longer just that crew's word. So while on VT-ANB both switches moved at the same time, and that is unlikely to happen by itself, it now appears possible that an external force such as a loose object or an inadvertant pilot motion could have moved both switches. At least, this requires further study to narrow down the conditions for it, and to check whether these conditions were present on the accident flight. all of the noise about these switches being foolproof and above suspicion hence it could only have been deliberate action yet many airlines have suffered inadvertent engine shutdowns because of accidental manipulation of fuel cut off switches/engine masters in and these specific switches on the identical fleet in the same airline, it\x92s certainly a noteworthy revelation dismissing this as professional crews trying to cover up for their colleagues or some other highly absurd slanderous accusation I would\x92ve hoped was beneath PPRUNE, but of course only Indians/foreigners are to be doubted, everyone else are professionals who only ever act with integrity. We\x92ve never seen western/American OEMs or regulators falling short on this absolutely not. Subjects
AI171
Fuel (All)
Fuel Cutoff
Fuel Cutoff Switches
Reply to this quoting this original post. You need to be logged in. Not available on closed threads. |
Page Links: Index Page