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Ready For Takeoff - Turn Your Aviation Passion Into A Career

The Ready For Takeoff podcast will help you transform your aviation passion into an aviation career. Every week we bring you instruction and interviews with top aviators in their field who reveal their flight path to an exciting career in the skies.
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Now displaying: Page 1
Mar 5, 2020

The B737 has an interesting stabilizer trim system, which operates at four different speeds.

 

Main Electric Trim

   Flaps Up: .2 units per second

   Flaps Down: .4 units per second

   Autopilot Trim

   Flaps Up: .09 units per second

   Flaps Down: .27 units per second

 

On the -300 and later models, there is a system called Speed Trim, which provides trim inputs during low speed operations with low gross weight, and aft center of gravity. It is most frequently observed during takeoffs and go-arounds. Conditions for the system to operate are:

 

  Airspeed 100-300 KIAS

 

10 seconds after liftoff

 

  5 seconds following release of trim switches

 

  N1 above 60%

 

  Autopilot not on

 

  Sensing of trim requirement

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