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> ... 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
by jcalvinowens 5y ago
> ... 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 https://youtu.be/aoNOVlxJmow?t=806
- dhx 5y agoThe 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 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-aerodynamically-relieving-airloads-using-manual-stabilizer-trim.html 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.
- salawat 5y agoI 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.