Ethiopian Airlines 737 MAX Investigation Preliminary Report

Re:Ethiopian Airlines 737 MAX Investigation Preliminary Report by Domenic_S on Thursday April 04, 2019 @03:47PM (#19576377)

Why is it possible to set the trim to insane? Is there a legitimate scenario where that would be used?

[ Parent | on HN ]

Re:Ethiopian Airlines 737 MAX Investigation Preliminary Report by 781 on Thursday April 04, 2019 @05:51PM (#19577466)

Well, the plane might be at an insane angle, so then you need an insane trim setting to correct it :)

[ Parent | on HN ]

Re:Ethiopian Airlines 737 MAX Investigation Preliminary Report by ls612 on Thursday April 04, 2019 @04:34PM (#19576823)

If the AoA was truly way too high then insane trim would be required to correct that. MCAS and similar systems came about in response to AF 447 where the pilots entered a high AoA situation and stalled the plane into the Atlantic.

[ Parent | on HN ]

Re:Ethiopian Airlines 737 MAX Investigation Preliminary Report by cjbprime on Thursday April 04, 2019 @05:02PM (#19577077)

Is it necessarily true that you have to use the stabilizer for MCAS? Would implementing a stick pusher instead fail to avoid some stalls?

[ Parent | on HN ]

Re:Ethiopian Airlines 737 MAX Investigation Preliminary Report by Zak on Thursday April 04, 2019 @09:37PM (#19578868)

It's true in the case of the 737 MAX where the pitch-up moment caused by the engines exceeds the elevator authority in a low-speed, high-thrust situation if the pitch trim is also set too high.

MCAS will evidently work with less maximum nose-down trim than the current version has, as the proposed update places a limit on it.

[ Parent | on HN ]