B737 Stabiliser Trim Motor Exchange Programme

Improved Stabiliser Trim Motor for Boeing B737-600/700/800/900 aircraft.

Eaton’s motion control systems division at Grand Rapids, Michigan, USA, has improved the C Model version of the Stabiliser Trim Motor (STM). The C Model (6355C0001-01) supersedes the former B Model (6355B0001-03) which is now obsolete and hence no longer supported by Eaton.

Satair recommend you take full advantage of the improved C Model, and at the same time benefit from our upgrade exchange prices and 48 months warranty. A limited amount of B Models can be exchanged for a C Model through Satair until 31 December 2016 on a first come, first served basis.


C Model benefits

  • Significant reliability improvement
  • 48 months warranty
  • Demonstrated performance
    • More than 10 years in operation
    • Over 1,200 units in service
  • Commonality across fleet while reducing spares requirements
  • Enhanced monitoring of flight-critical actions
  • Re-designed internal electrical components to facilitate reliability and maintainability


Value price proposition

  • New spare price: $105,770.40
  • Factory new unit offered at 55% of the normal spare price
  • Price for a serviceable B or C Model in ILS: Around $70,000
  • Exchange price: $60,000 (until 31 December 2016)


About the C Model – 6355C0001-01

  • Mod 7 board level revision 13
  • First aircraft delivered in September 2008
  • 270,722 Mean Time Between Failures (MTBF)
  • 70,000 Mean Time Between Unscheduled Removals (MTBUR)
  • For Boeing 737-600/700/800/900 aircraft
  • Two-way interchangeability with prior STM units; Refer to Boeing 737NG IPC 27-41-71-01, item 40
  • Brushless three-phase motor design
  • Low-loss power bridge with IGBT switches
  • Processor-based motor commutation and velocity control
  • Dual current limit (torque) control circuits
  • Power-up built-in test
  • Continuous fault monitoring
  • Fault storage (non-volatile memory)
  • RS-232 test/maintenance interface
  • Investment cast housing
  • Two-stage spur gear train
  • Modular, bottom-up assembly – two electronic sub-assemblies, motor, housing with gear train



  • Contact your Satair Sales Representative to order the new improved STM C Model
  • B Model to be returned to Eaton (unit does not need to be serviceable) - Eaton Aerospace; 3675 Patterson S.E.; Grand Rapids, MI 49512, USA
  • Once the return is confirmed, Satair will ship a new C Model spare.

Contact us