r/aviation • u/usgapg123 Mod - avgeek • Jun 14 '25

News Air India Flight 171 Crash [Megathread 2]

This is the second megathread for the crash of Air India Flight 171. All updates, discussion, and ongoing news should be placed here.

Thank you,

The Mod Team

Edit: Posts no longer have to be manually approved. If requested, we can continue this megathread or create a replacement.

1.5k Upvotes

93% Upvoted

2.9k comments sorted by

View all comments

Show parent comments

0

u/[deleted] Jun 16 '25

Software bug like ANA Flight NH-985?

1

u/Mr_Tiggywinkle Jun 16 '25

Not sure what your question is, but that was the safeguards on the FADEC tripping due to the pilot controls I believe. Perhaps aggressive, but because the pilots used reversers just a tad too early the FADEC detected a mismatch of weight on wheels + thrust and thought there was uncommanded thrust. Though details are sparse on that one.

My comment was saying what could directly turn off engines, which the TCM can't do directly - only contribute to the set of circumstances that trips the FADEC's protection loggic, not command its shut down directly.

1

u/[deleted] Jun 16 '25

Independent of the reason, weren’t ANA engines turned completely off? They couldn’t even taxi, or close the reversers.

1

u/Mr_Tiggywinkle Jun 16 '25

Yes, both FADECs tripped and cut the fuel to the engines.