How the Boeing 737 Max disaster looks to a software developer (2019)

Re:How the Boeing 737 Max disaster looks to a software devel... by jcalvinowens on Monday February 07, 2022 @10:13AM (#30245887)

> ... it can become impossible for a pilot to physically turn the manual trim wheels to get back into trim

I feel like this isn't talked about enough. I had no idea how bad it can actually get: https://youtu.be/aoNOVlxJmow?t=806

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Re:How the Boeing 737 Max disaster looks to a software devel... by dhx on Monday February 07, 2022 @11:27AM (#30246992)

The difficulty of using the manual trim wheels is also demonstrated in this simulator run showing the MCAS problem: https://www.youtube.com/watch?v=xixM_cwSLcQ&t=1011s

There is some discussion amongst pilots at https://www.pprune.org/tech-log/619326-boeing-advice-aerodyn... which further explains how difficult it can be to manually reduce load on the stabilizer and manually trim the nose up.

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Re:How the Boeing 737 Max disaster looks to a software devel... by salawat on Monday February 07, 2022 @06:44PM (#30253141)

I did some napkin math to try to calculate the force that'd have to be applied to the jackscrew to actuate under load, and it was not a small number. Basically, an electric motor with the torque of a sporty automobile.

With the gear ratios we're talking with by hand actuation, I would not want to have to be one of those pilots.

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