Originally Posted by
sonicbum
Hope nobody starts a discussion on the technical aspects of the SRS activation logic as it could have happened on any aircraft with the same results.
Actually, it wouldn't. While using thrust lever angle as TO/GA AFDS trigger is a very good design and very intuitive, it certainly proved to be less than optimal in this case, as only the thrust increased, but there was no change to AFDS mode - contrary to what a reasonable crew might expect on approach, should they select TOGA while established on the ILS approach.
B737 for example (and I would imagine other Boeing types would be fairly similar), uses separate TO/GA switches and they are armed as G/S is captured
or flaps are extended
or RA below 2000ft. If TO/GA is pressed outside of those conditions, nothing happens. So in this case, even if the flaps were selected to up, TO/GA would still engage as expected, as the G/S was captured and the aircraft was below 2000ft RA.