Posts about: "AvHerald" [Posts: 10 Pages: 1]

This was handled in this PPrune thread:
ANA 787 Engines shutdown during landing
and in AvHerald:
https://avherald.com/h?article=4c2fe53a&opt=0

Just to clarify one point: the ANA B787 was powered with RR Trent 1000 engines while the Air India had GEnx-1B67 engines.
So, the Air India thrust failure may still have its source in the TCMA system, however, if it's the case, the logical path must be somewhat different than for the thrust reversers of the ANA airplane.

IMO

In the CCTV video, the aircraft stops climbing at 00:28. 3 seconds after, it starts visibly descending. At peak altitude, using the 197ft wingspan as a measure, the altitude is around 200ft or below. The fireball is at 00:48, 17s after descent starts visibly.

Per google maps and the impact location mapped at avherald, the impact point is ~3990ft from the airport boundary road and about 4200ft from the midpoint of the runway threshold and the airport boundary road.

16:1 to 25:1 is what I could find for the 787 glide ratio range (unpowered) with main landing gear down and flaps 5. So the aircraft could cover 16 to 25 ft horizontally for every 1 ft of descent.

With a starting altitude of 200ft, that would imply it could have covered 3200ft.to 5000ft during unpowered descent.

The actual distance covered, around 4000ft, certainly seems to suggest that the descent was unpowered.

Thanks for those numbers. Note, however, the max 787 L/D, flaps and gear up , is reportedly 21 (best in class), which casts shade on the credibility of those L/Ds, certainly 25 with the gear down. What is your source? IF the actual L/D with the gear down and flaps 5 is somewhat lower than 16 and given that starting height and distance traveled are correct\x97and considering that the aircraft might not have been at the speed for max L/D with the gear down and the possibility of a headwind\x97then there must have been some thrust during the descent (it did look to me to be somewhat flatter in that video taken from one side than I would have expected with the gear down, a relatively slow initial speed, and no thrust) or the engines were spooling back up at the end.

Do all 787s come with electrically adjustable seats, or is that still an option like on older models?

There\x92s a comment (user jepper) on AvHerald mentioning that the captain\x92s seat inadvertently slid backward (due to failure of the aft locking mechanism - is there such a thing on electrically adjustable seats?), which supposedly caused the captain to pull the thrust levers to idle during rotation. That said, I\x92m struggling to understand why his hand would even be on the thrust levers at Vr.

A later comment cast doubt on the glide ratio. But flying below wingspan altitude, which it was, will extend glide range because of the ground effect. Plus the descent glide range may have started later than the airport boundary. It seems plausible that the glide range is compatible with total and rapid loss of thrust.

Agreed.
Also, I expect the airport would've sent a car out to check the runway for evidence. Since we agree that the engine failure occurred near rotation, and that rotation occured well inside the runway ( see e.g. fdr here , or the granular ADS-B data), that car would've encountered a bloody mess, and we'd all know about it by now.

The problem with these reports is that the Indian AAIB and DGCA websites ( aaib.gov.in www.dgca.gov.in ) are mute on the subject of this crash, so even the DGCA inspection mandate quoted above is shakily sourced. On Friday, AvHerald had already updated with "On Jun 13th 2025 the DGCA reported, that initial preliminary findings rule out a bird strike as no bird carcasses have been found." I searched for a source for this, and found an "exclusive" which read, "The initial probe report of the Ahmedabad Air India crash, accessed by CNN-News18, reveals key findings from the Directorate General of Civil Aviation\x92s assessment led by the director of security." Other media simply quoted News18. There are two reasons to be skeptical here:
\x95 first, we have seen fake reports circulating;
\x95 secondly, News18 rates badly on mediabiasfactcheck.com: "Launched in 2005, CNN-News18 (formerly CNN-IBN) is an English-language Indian news television channel based in India. We also rate them Questionable based on a poor fact-checking record with numerous false claims."
That leads me to consider that this "exclusive" might be sloppy reporting based on a fake\x97I have no way to know whether it is legitimate or not.

At this point, I feel we can only rely on information being official if it's published through an official website, or if there's independent reporting or a video clip from an official press briefing.

I do believe the accident was not caused by an animal strike, for many reasons.
But I wouldn't believe it based on unsourced reporting alone.

Rather confusingly, AvHerald carries this today

"On Jul 12th 2025 (UTC) India's media report that the investigation is NOT focussing on a human action causing the fuel switches to appear in the CUTOFF position, but on a system failure."

I have no idea what provenance to attach to that!

Does the EAFR record the electrical / physical contact of the RUN / CUTOFF switch or, does it record a software 'EVENT' which has the same 'signature' as the RUN / CUTOFF switch being toggled. My thoughts are that the RUN / CUTOFF switch never moved but, the underlying software / hardware system mal-functioned triggering a scenario similar to both RUN / CUTOFF switches being triggered

Some Boeing SB's describe circuit board failures triggering all sorts of unexpected / unpredictable failures

I have rebuilt the site that organises this thread by subject here: https://paulross.github.io/pprune-th...171/index.html

It studies 3703 posts (and discards 1043 of them).

Changes:

- Add subjects: "Action slip", "AvHerald", "Human Factors", 'Pilot "Why did you cut off"'.
- Build threads up to July 13, 2025, 10:57:00 (built on July 13, 2025, 12:02:17).

Project is here: https://github.com/paulross/pprune-threads
Raise issues here https://github.com/paulross/pprune-threads/issues or PM me.

Yes, even the switch thing can go nowhere without "interim reports".