PPRuNe Forums - View Single Post - 737 Stuck Manual Trim Technique

8th Apr 2019, 07:29

#49 (permalink)

GordonR_Cape

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Quote:

Originally Posted by FlightDetent

gents, anyone able to asnwer these: https://www.pprune.org/rumours-news/619272-ethiopian-airliner-down-africa.html#post10441180
help appreciated.

The only facts that are known (from DaveReidUK) is that one turn of the wheel equals about 0.07 trim units. That is not a misprint, 15 rotations per unit of trim.

Conversely MCAS trims down at 0.27 units per second, or 3.5 rotations of the wheel per second! That is a lot of manual winding, for every 9 second activation.

The rest will have to be officially answered by Boeing engineers.

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