737 Stuck Manual Trim Technique

[GordonR_Cape]

Originally Posted by Roger_Murdock

Ostrower has a copy of the 1982 FCTM with a description of "roller coaster" technique:

https://theaircurrent.com/wp-content...-1240x1903.jpg

(main article)

I find it moderately interesting that the case chosen for evaluation is runaway nose up trim, which is an urgent stall hazard. Presumably nobody in 1982 could visualise the hazards of runaway nose down trim, perhaps due to the limited range of trim travel allowed by the autopilot in the flaps down condition. As the article notes, assumptions made five decades ago, are still propagating through today's 737 flight controls.