Preliminary report into Air India crash released

Post by ummonk » Fri, Jul 11, 2025, 9:38 PM UTC

alephnerd wrote: post #14

decimalenough wrote: post #11

> The aircraft achieved the maximum recorded airspeed of 180 Knots IAS at about 08:08:42 UTC and immediately thereafter, the Engine 1 and Engine 2 fuel cutoff switches transitioned from RUN to CUTOFF position one after another with a time gap of 01 sec. The Engine N1 and N2 began to decrease from their take-off values as the fuel supply to the engines was cut off. So the fuel supply was cut off intentionally. The swi…

> It's difficult to conclude anything other than murder-suicide. Is it possible it could have been an accident or a mistake by one of the pilots? How intention-proofed are engine cutoffs?

Post by shoghicp » Fri, Jul 11, 2025, 9:39 PM UTC

barbazoo wrote: post #20

lazystar wrote: post #17

Earlier quoted context omitted.

https://ad.easa.europa.eu/ad/NM-18-33 well hold your horses there... from the FAA in their 2019 report linked above: > The Boeing Company (Boeing) received reports from operators of Model 737 airplanes that the fuel control switches were installed with the locking feature disengaged. The fuel control switches (or engine start switches) are installed on the control stand in the flight deck and used by the pilot to sup…

Same manufacturer, Air India 171 was a 787-8 though.

Post by tekla » Fri, Jul 11, 2025, 9:43 PM UTC

bgwalter wrote: post #25

decimalenough wrote: post #11

> The aircraft achieved the maximum recorded airspeed of 180 Knots IAS at about 08:08:42 UTC and immediately thereafter, the Engine 1 and Engine 2 fuel cutoff switches transitioned from RUN to CUTOFF position one after another with a time gap of 01 sec. The Engine N1 and N2 began to decrease from their take-off values as the fuel supply to the engines was cut off. So the fuel supply was cut off intentionally. The swi…

Does the Flight Data Recorder consider the physical position of the fuel switches or does it get the information from some fly-by-wire part that could be buggy? The conversation would suggest that the switches were in CUTOFF position, but there is also a display that summarizes the engine status. There is no conversation that mentions flipping the switch to RUN again. EDIT: Why is there no Cockpit Video Recorder? The…

Post by ceejayoz » Fri, Jul 11, 2025, 9:46 PM UTC

bob1029 wrote: post #18

> The EGT was observed to be rising for both engines indicating relight. Engine 1’s core deceleration stopped, reversed and started to progress to recovery. Engine 2 was able to relight but could not arrest core speed deceleration and re-introduced fuel repeatedly to increase core speed acceleration and recovery. I know it's probably not worth the hazmat tradeoff for such a rare event, but the F-16 has an EPU powered…

Post by ggreer » Fri, Jul 11, 2025, 9:51 PM UTC

shoghicp wrote: post #24

barbazoo wrote: post #20

Earlier quoted context omitted.

Same manufacturer, Air India 171 was a 787-8 though.

The affected table includes these models as well: 787-8, -9, and -10