Part# 11-08506
MFR Model# ST-1-12V


Designed for standard electric trim servos, the Safety-Trim Intelligent Servo Controller (Safety-Trim) is an electronic speed control system for experimental aircraft. Safety-Trim provides the directional switching function as well as the adjustable speed control function needed to drive electric trim motors with a time limited operation of the trim servo motors that reduce the possibility of run-away trim and failure to operate conditions. Safety-Trim is an important safety feature that is short circuit proof and reverse polarity protected.

2 speed preset models are set for high and low speed trim actuation that allow separately adjustable trim speeds for different flight configurations. The single axis heavy-duty model is for DC trim motors and linear actuators rated for operation at 12 volts and up to 10 amp.
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  • Electronic servo controller with speed control run-away protection
  • Time limited operation prevents trim servo run-away conditions
  • Servo travel limited to 3 seconds per trim switch actuation
  • Reverse function switch allows pilot to recover from a stuck or failed trim switch
  • Eliminates many other components, no extra relay decks or speed controllers needed
  • Very simple wiring, no extra parts needed for pilot and co-pilot trim switches
  • Designed for standard electric trim servos, such as the Ray Allen T2 & T3 series
  • Short circuit proof, reverse polarity protected
  • 1 axis, 2 axis models available
  • User adjustable, 1 speed and 2 speed models available
  • For Experimental aircraft only NOT TSO'd
  • Made in USA -- patented


Input Voltage 10 30 volts DC
Output Voltage User adjustable 6-12 volts DC, 1 amp maximum
Inputs Trim switch inputs, closures to ground
pilot/co-pilot switches wired in parallel
2 speed switch, closure to ground
Output Time limited, controlled DC voltage to servo
Time limit factory set to 3 seconds
Wiring Standard 15-pin D-sub connector (male on controller) pre-made wiring harness with ON/OFF/Reverse switch available
Enclosure Overall dimensions 5.7 x 2.5 x 1.5
UL 94V-0 rated material, 60C max temperature
Weight 6 oz.
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Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

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