Originally Posted by
Hi_Tech
Gums: If you look at the dotted lines, they are all different. I hope the following edited fig makes sense.
UHHH Most 737 stab trim motors are electric
http://www.eaton.com/ecm/idcplg?IdcService=GET_FILE&allowInterrupt=1&RevisionSelectio nMethod=LatestReleased&Rendition=Primary&&dDocName=PCT_20101 9
Which gives a pdf file DS400-1A_B737 Stab Trim Upgrade.pdf
Eaton’s new Model 6355C Stabilizer Trim Motor features:
• Brushless three phase mo-tor 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
Eaton’s Stabilizer Trim Motors
(STM) Model 6355B0001-02 and -03 have been used on Boeing’s 737-600/700/800/900 aircraft, starting with Line #1423, delivered in December 2003. The “B” model has been
superseded by Model 6355C, and replacement parts for the “B” model will be available for a limited time only — estimated at 3 years, based on usage. Parts scheduled for future obsolescence include:
• EMI FIlter Assembly
• Brushless DC Motor Assembly
• Voltage Reference
• Control Board Assemblies
• Isolated Drive Transmitter
• Isolated FET Driver