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FL370 Officeboy
2025-06-12T16:25:00 permalink Post: 11899438 |
something I\x92m not sure has been discussed till now- doesn\x92t the 787 have an \x91early door\x92 function where the gear doors automatically open to improve performance? Even pprune has discussed this:
B787-9 LDG gear retraction (That thread is illuminating in light of this loss for a number of reasons too) in the video/images seen it doesn\x92t appear that the gear doors are down, does this further indicate an AC power loss? (not sure if this applies to the entire 787 family though) Subjects: Gear Retraction 3 users liked this post. |
FL370 Officeboy
2025-06-12T20:42:00 permalink Post: 11899714 |
The theories concerning inadvertent flap retraction are not consistent with the apparent transcript from the mayday call made or rat deployment. In the first video that circulated, the engines can\x92t really be heard (certainly not producing any significant amount of thrust). If the aircraft was climbing out misconfigured, those engines would be screaming. Instead, all you can hear is the rat.
Similarly - a bird strike, knocking out two engines simultaneously is a noisy/messy event and I would expect to see evidence of this occurring in both videos, and in the area at the point of ingestion. The engines don\x92t just roll back with a bird strike - they surge, smoke, bang and splutter. It would be very apparent. At this time, I think everything is pointing towards both engines simultaneously having their fuel feeds interrupted between V1 and Vr. CVR/FDR will be interesting. The fact none of the above happened, coupled with the lack of landing gear coming up, makes me think they didn\x92t have thrust to play with. Subjects: Bird Strike Dual Engine Failure Engine Failure (All) Flap Retraction Flaps (All) Gear Retraction Mayday V1 2 users liked this post. |
FL370 Officeboy
2025-06-14T09:11:00 permalink Post: 11901290 |
Yes, we did acceleration checks, time to 100 knots, on the Valiant and, I believe, the Victor in the RAF. As well as brake drag, this proved engine performance was correct. I was surprised this was not done when I moved to civil jets. Many years ago I proposed a system called TOPIS. Take Off Performance Indicator System. Basically a bug driven around the ASI to show required and achieved speed.
IF, repeat IF, such a system was installed on that 787 it MIGHT have revealed a thrust problem before V1. ( and prevented the TUI BRS incident ) So, after a lot of thought, an unexplained loss of thrust on BOTH engines must be in the frame. But why? What is common to BOTH except the autothrottle system, driving the thrust levers. Even then it is possible to manually firewall the thrust levers, at least one could on the 73,75, and 76. So, a real mystery. I will await the Investigatirs conclusion now they have the FDR. |
FL370 Officeboy
2025-06-14T16:34:00 permalink Post: 11901631 |
I still think total loss of thrust can be the only explanation. Nothing else makes sense - the question is
how and why
.
The 787 has had issues with 5G interference that could affect A/T and engines. This has been limited to landing phase in terms of guidance but I really hope there\x92s not a latent issue for takeoffs related to going from ground to air or such like. https://www.faa.gov/sites/faa.gov/fi...AN-2022-01.pdf https://www.nperf.com/en/map/IN/1279...600587&zoom=12 Subjects: None 1 user liked this post. |
FL370 Officeboy
2025-06-14T19:59:00 permalink Post: 11901779 |
![]() Accident aircraft with TE flaps visible. ![]() \x91Normal\x92 787 takeoff with flaps Subjects: None 7 users liked this post. |
FL370 Officeboy
2025-06-15T10:18:00 permalink Post: 11902325 |
Subjects: APU |
FL370 Officeboy
2025-06-15T18:53:00 permalink Post: 11902716 |
The biggest news site in Greece claims to have the results of a kind of preliminary report from India AAIB which say that as the plane rotated, the pilot's seat malfunctioned (broken pin) and went suddenly far back forcing the captain to accidentally lower the thrust lever as he already had his hand on it and despite the co-pilots effort to help increase the thrust it was already to late to avoid the stall. I dont believe they would have posted something as serious as this without any credible source cause they are supposed to be a serious news outlet but you never know when stupidity takes over validity. Source is the protothema dot gr site
Subjects: AAIB (All) FADEC Preliminary Report |
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