Originally Posted by
JT8D-17
How many turns of the wheel are required to change trim by one unit?
10 rotations for one unit of trim.
(Source: Boeing FCOM Bulletin FLR-6(FR) dated August 10, 2012. Subject: Runaway Stabilizer Procedure. From Background '..
the stabilizer trim wheel coasted up to 40 turns (four units of trim).')