Posts by user "AirScotia" [Posts: 18 Total up-votes: 19 Pages: 1]

AirScotia
2025-06-12T16:15:00
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Post: 11899420
What is the precise trigger for the RAT to deploy automatically on the 787? Full failure of both engines?

Subjects: RAT (All)  RAT (Deployment)

AirScotia
2025-06-12T23:12:00
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Post: 11899824
I'm reminded a little of Emirates EK321, back in 2021, where the pilots left the MCP altitude setting at 0ft. https://simpleflying.com/emirates-bo...-long-takeoff/

However, that would have nothing to do with the RAT deployment.

Subjects: RAT (All)  RAT (Deployment)

AirScotia
2025-06-13T17:28:00
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Post: 11900718
Originally Posted by Util BUS
I believe the loud bang that survivor heard was a (BTB) Bus Tie Breaker short.

Based on the comments made by the passenger who travelled on the aircrafts previous sector, speaking about air conditioning that was going on and off, I think a faulty (CAC) Cabin Air Compressors may have contributed.

The B787 FCOM has information about the about only two of four CAC\x92s being used for ground operation, maybe B787 crew can confirm.

I am curious if the increased electrical demand of the CAC\x92s shortly after take-off somehow contributed to this potential short.

If such a short did occur then the next question would be how this may influence the engine controls, but given the 248 day AD for electrical issues, it could potentially affect the engines.

I was also surprised to learn that the B787 EICAS actually has a ENG THRUST caution, so not a totally unexplored issue.
The aircraft register posted above does show an air compressor issue, albeit in 2015:

2015-09-22: Air compressor failure caused smoke in cabin and diversion for checks. Aircraft diverted to Kolkata for an emergency landing, returned to service same day after air compressor replaced.

Subjects: Air Worthiness Directives  FCOM

AirScotia
2025-06-13T19:09:00
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Post: 11900821
Originally Posted by Quantz
Is it relevant ?
Seems to denote poorly maintained aircraft.
https://www.threads.com/@r.bharowal/...jcQdTrixV8PbWw
A response on that Thread:


Subjects: None

2 users liked this post.

AirScotia
2025-06-13T20:51:00
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Post: 11900889
Would it be reasonable to expect multiple CCTV videos, cf Jeju at Muan? I was surprised by how many videos became available after that sad crash.

Subjects: CCTV

AirScotia
2025-06-14T16:36:00
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Post: 11901633
I read that the 'AAIB' will be investigating. I presume that's AAIB (India)? Do we know what facilities the AAIB (India) has for reading FDRs?

Subjects: AAIB (All)  AAIB (IDGA)

AirScotia
2025-06-14T20:20:00
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Post: 11901800
I've been 'watching' flights take off from Ahmedabad on FR24. Assuming that the bold dots on the track are where FR24 gets some real transponder data, it looks as if flights become visible at take-off, then FR24 interpolates the track until roughly 800m/1km from the end of the runway when it gets the next 'real' data block. So all we can conclude is that the transponder stopped transmitting somewhere in the 8 - 10 seconds between take-off and 1km.

Subjects: FlightRadar24

AirScotia
2025-06-15T14:37:00
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Post: 11902511
We're on the fourth day of this accident, and so far all that we - the public - have to go on is two grainy videos. I'm surprised that there haven't been more CCTV images and eye-witness accounts, especially in the middle of a city. I realise it was a very short flight, and didn't get high enough to be widely visible, but there seem to be a lot of buildings round there and it was early afternoon. Why so little information?

Subjects: CCTV

1 user liked this post.

AirScotia
2025-06-15T23:16:00
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Post: 11902947
Originally Posted by EDML
Most of these systems are very simple. They are not running on a fancy OS. Mostly we are talking about a couple Kilobytes of code.

The TCMA doesn't do a lot. That makes it a lot easier to make sure that it works correclty.

That is how most embedded systems work.
What happens if the inputs are erroneous because of a mechanical or maintenance failure?

Subjects: EDML  TCMA (All)

AirScotia
2025-06-16T21:23:00
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Post: 11903810
May I just say that being locked out of the Pprune thread and left to the mercy of other sites, makes a person immensely grateful for Pprune.

Subjects: None

10 users liked this post.

AirScotia
2025-06-17T14:06:00
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Post: 11904327
Originally Posted by za9ra22
Clearly the quote does not come from someone within the investigation, so what is reported can't be taken as any authoritative voice of any kind.

Not only that, but 'an official, a former Air India captain', unnamed, 'trained by the Captain of the accident flight...' being quoted in an article which contains known inaccuracies such as that the aircraft used more runway than usual, continues to misquote the survivor, and adds that the 'ELT has been recovered' (which doesn't seem at all relevant)....

Hardly a trustworthy source of accurate information.
Quite a few media outlets showed photos of the 'black box', which clearly was an ELT. So it's reassuring that someone knew the difference,

Subjects: None

1 user liked this post.

AirScotia
2025-06-19T07:38:00
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Post: 11905799
Originally Posted by Seamless
There seem to be issues with the evaluation due to damages. Cannot assess the reliability of the source.

https://weeklyvoice.com/damaged-blac...medium=twitter
If this is true, it means all the "they'll know what's happened" is blown out. We may still be in fleet-grounding territory.

Subjects: None

2 users liked this post.

AirScotia
2025-06-19T21:06:00
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Post: 11906372
In the ANA 787-8 incident, I think they couldn't restart the engines in order to taxi? Is that also a feature of TCMA?

Subjects: TCMA (All)

AirScotia
2025-06-19T22:34:00
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Post: 11906450
Originally Posted by MatthiasC172
*On the ground* you get into a latched state, once TCMA deploys: after activation the relays stay latched to prevent a re-runaway. A full power reset of the affected EEC channel(s) and relay logic - normally done only at the gate - is required before fuel can flow again. So you can\x92t easily relight.
Thanks, makes sense.

Technically, then, if TCMA deployed erroneously during takeoff, there would be no way for the pilots to restart the engines?

Subjects: Fuel (All)  Fuel Pumps  TCMA (All)

2 users liked this post.

AirScotia
2025-06-21T13:57:00
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Post: 11907776
The situation with reading the flight recorders seem increasingly suspicious to me. As of yesterday, they're still dithering about whether to send them to the USA? Is this about India not wanting to reveal their smart new facility can't do the job? Or unwillingness to trust the US/Boeing? Or some other kind of argument? It seems ridiculous to me that no decision has been made about the boxes nine days after the crash and the rapidly discovered recorders.

India to decide on overseas analysis of Air India crash flight recorders

Subjects: DFDR

AirScotia
2025-06-29T19:49:00
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Post: 11913191
I've been travelling without access to internet, but I came across this video a few days ago. I don't know anything about the three guys, but they're apparently retired air accident investigators.


They seem to think that some of the EAFR data is now in the US. Is that actually the case?

Subjects: EAFR

1 user liked this post.

AirScotia
2025-06-29T20:30:00
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Post: 11913209
Originally Posted by za9ra22
Nobody here could answer that, but since the authorities in India have said the recorders themselves are there and not going anywhere, I would guess that if any data has been downloaded and shared outside the country, it will be for specific analysis purposes - GE for example.

There's no credible reasons 'three former accident investigators' in the US would have any direct knowledge, and if any third party in the US has been provided access to data, it will have been on the basis that it is not shared. Even that I would doubt, since involved parties are far more likely to already be in India as part of the investigation.
One thing they said is that the accident site was 'cleaned up, short order', suggesting that this might make it difficult to check physical state against what the FDR has recorded, eg if the FDR says the flaps are down, but the physical evidence says the flaps are not down. They show video of a digger scooping up wreckage.

As I said, I've been out of the loop for a few days. Do we know if the wreckage is being reconstructed in a warehouse, or whatever? I appreciate there may not have been that much left to reassemble, but the was at least one wing, a tail section, and the wing box section that the chap managed to escape from.

Subjects: FDR

AirScotia
2025-07-01T10:07:00
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Post: 11914158
One of the things I've learned on this thread is that planes landing with the RAT deployed may be rare, but it does happen. The videos I've watched suggest that the engines were usually running as the plane landed, but of course the RAT can't be un-deployed in flight.

My question is: what caused the RAT to deploy on those flights? Presumably reports have to be submitted in those cases?

Subjects: RAT (All)  RAT (Deployment)