PPRuNe Forums - View Single Post - The Roller Coaster technique in Boeing 737's
Old 20th May 2026 | 00:23
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Someone Somewhere
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From: New Zealand
Originally Posted by BraceBrace
So if you want to focus on the rollercoaster in a training syllabus, I would at least double the amount of time working on the stab trim runaway scenario. Avoidance creates much bigger safety than having to correct afterwards.
I'd be inclined to agree; it's an ambulance at the bottom of the cliff reaction. Note also that:
  • They removed the separate cutoff switches for manual and automatic electric trim (so pilots could not use the thumb switches to get the aircraft back in trim if the computers got it out of trim)
  • They reduced the size and leverage of the trim wheel on the NG compared to the classic
  • IIRC the simulators did not adequately simulate the forces on the trim wheel at high speeds and out of trim - it would have been essentially impossible to get back in trim even with a rollercoaster.
There's surely more critical, more general training that needs to be done.
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