Originally Posted by
Jet Jockey A4
. . . they tried the Boeing procedure that was originally in the Boeing 737/200 books for a trim runaway and the outcome was not always positive with many crews losing the aircraft despite starting at 7000' AGL and of course knowing what was going to happen prior to starting the exercise.
Were you referring to the "roller coaster" manoeuvre, where back-pressure on the control column is reduced to permit the use of the manual trim wheel to "unjam" the stabilizer at very high speeds?
To my knowledge, this certification question still hasn't been clarified, nor the reason given for eliminating the manoeuvre from the B737 FCOM after the -200.