2025-06-13T13:17:00
permalink Post: 11900509
There is a summary of all possible causes plus what indication supports the cause in
this article
Subjects: None
8 users liked this post.
2025-06-14T08:13:00
permalink Post: 11901237
As so much of the analysis hinges on whether or not the RAT was deployed, I notice that back in 2015 on another forum somone posed the question
https://forum.dcs.world/topic/119812-787-deployed-ram-air-turbine/"I wonder why so many of these 787's land with their Ram Air Turbine deployed?"
Ttere are a number of videos around showing 787s landing with RAT deployed and it appears that this happens with 787s more than other types.
Can any knowledgeable Pruner answer this? Is there a problem with the 787's RAT and its deployment, or is the deployment a symptom of a problem within the 787s systems?
https://forum.dcs.world/topic/119812-787-deployed-ram-air-turbine/"I wonder why so many of these 787's land with their Ram Air Turbine deployed?"
Ttere are a number of videos around showing 787s landing with RAT deployed and it appears that this happens with 787s more than other types.
Can any knowledgeable Pruner answer this? Is there a problem with the 787's RAT and its deployment, or is the deployment a symptom of a problem within the 787s systems?
Subjects: RAT (All) RAT (Deployment)
2 users liked this post.
2025-06-14T18:27:00
permalink Post: 11901706
1. there are multiple frames of the video showing ' something' at the position where the RAT is located under the fuselage
2. the sound in the video which is very similar to a deployed RAT
3. the sound analysis posted here by multiple people
last but not least
4. the aircraft stopped transmitting ADSB data shortly after the rotating. This indicates an electrical failure. Other aircraft ADSB data was picked up by FR24 receivers indication there is a good reception of the signal in that area.
Subjects: ADSB Audio Analysis Electrical Failure FlightRadar24 RAT (All) RAT (Deployment)
8 users liked this post.
2025-06-14T20:07:00
permalink Post: 11901788
There are more data messages than that, which FR24 shared on the day of the accident and which have been posted a few times in this thread. I'm pretty sure there's also been a comparison of this + previous flights posted in this thread that shows that while the coverage at the airport itself is spotty, it's reasonable to expect further messages to have been received before impact.
Not sure how permanent the content at this URL is, but here's a link to FR24's update which has a CSV with all frames received https://www.flightradar24.com/blog/f...rom-ahmedabad/
Not sure how permanent the content at this URL is, but here's a link to FR24's update which has a CSV with all frames received https://www.flightradar24.com/blog/f...rom-ahmedabad/
Somebody on this forum did some analysis with FR24 data of this flight and other AI171 B787 flights.
See this article for an overview of all scenarios. It all looks very like to an commanded dual engine shutdown. Why nobody knows.
Subjects: AI171 Dual Engine Failure Engine Failure (All) Engine Shutdown FlightRadar24
2025-06-14T20:13:00
permalink Post: 11901794
https://www.flightradar24.com/blog/f...rom-ahmedabad/
Subjects: ADSB FlightRadar24
1 user liked this post.
2025-06-14T20:19:00
permalink Post: 11901798
People really need to stop using FR24 data if they don't understand it.
This FR24 recording of AI171
https://www.flightradar24.com/data/f.../ai171#3ac3097
only consists of 4 unique ADS-B data messages. The first two were on the apron/taxiway. Then one at the runway intersection. And the fourth and last one just after the aircraft became airborne. That's all.
The two last ADS-B data messages are more than 4 minutes apart. It was 8:04 UTC when they entered the runway at the intersection. The next and last data point was received at 8:08 UTC.
The map view connects these dots, so it looks like a proper track. But in reality the ADS-B receiver barely received anything. It's therefore silly to argue the aircraft stopped transmitting ADS-B data based on this poor recording. The only thing you can say with certainty is that FR24's ADS-B receiver at Ahmedabad has really, really poor coverage...
This FR24 recording of AI171
https://www.flightradar24.com/data/f.../ai171#3ac3097
only consists of 4 unique ADS-B data messages. The first two were on the apron/taxiway. Then one at the runway intersection. And the fourth and last one just after the aircraft became airborne. That's all.
The two last ADS-B data messages are more than 4 minutes apart. It was 8:04 UTC when they entered the runway at the intersection. The next and last data point was received at 8:08 UTC.
The map view connects these dots, so it looks like a proper track. But in reality the ADS-B receiver barely received anything. It's therefore silly to argue the aircraft stopped transmitting ADS-B data based on this poor recording. The only thing you can say with certainty is that FR24's ADS-B receiver at Ahmedabad has really, really poor coverage...
Subjects: ADSB AI171 FlightRadar24
2 users liked this post.
2025-06-15T09:25:00
permalink Post: 11902276
Can we focus on theories explaining the facts? Specifically:
- Aircraft used almost the whole runway (3500m)
- Flaps found on the ground in setting 5
- RAT deployed
- Mayday that they lost power
Subjects: Dual Engine Failure Engine Failure (All) Mayday RAT (All) RAT (Deployment)
12 users liked this post.
2025-06-21T15:26:00
permalink Post: 11907842
" A source at the airport did indicate that refuelling took longer than usual (at 42 minutes), but a few others indicated that this was not really an out-of-the-ordinary occurrence for a long-distance international flight with full load."
Subjects: None