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737-300/400/500MAINTENANCE MANUAL
C. Prior to takeoff, with the throttles advanced, and with the stabilizer not within the green range, the takeoff warning system will cause a warning horn to sound, indicating unsafe takeoff condition (AMM 31-26-00/001).
D. Manual control is accomplished by rotating either trim wheel on the control stand. The trim wheels are splined to a common shaft which has a sprocket. Rotation of the trim wheels transmits motion to the forward trim mechanism sprocket by a chain assembly. The forward trim mechanism sprocket drives the cable drum which is cable connected to the jackscrew gearbox cable drum. The jackscrew gearbox cable drum drives the jackscrew to position the stabilizer. The jackscrew gearbox cable drum and cable assembly provides a dual purpose system. During normal electrical operation, it drives the forward mechanism to provide stabilizer position indication, and during manual operation, it positions the stabilizer. If the electrical system is jammed, initial actuation of the trim wheel operates a clutch which disconnects both motors.
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A 737-300/400/500MAINTENANCE MANUAL
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
inoperative system binding or Stabilizer trim PSTA damaged motor on nections or Loose wire con-jackscrew gearbox or ball nut and ward mechanism, sprockets, for-in cable drum, Foreign objects PSTA is bad. If 115V AC is present, for 115V AC at PSTA. Check for continuity and (AMM 27-41-00/501). control wheel operate stabilizer trim Check force required to replace PSTA. required, or repair circuit as connections, Tighten loose repair damage. Remove object and
magnetic clutches damaged electro-nections or Loose wire con- is present, PSTA is bad. netic clutches. If 28V DC for 28V DC at electromag-Check for continuity and 401). (AMM 27-41-71/ replace PSTA (as required) or repair circuit connections, Tighten loose
circuit or electric Bad safety relay or bent jackscrew gearbox assembly Damaged jackscrew is bad. is present, safety relay for continuity. If 28V DC Check safety relay circuit is present, unit is bad. tion. If excessive chatter jackscrew for smooth opera-Check jackscrew gearbox and relay. replace safety required or Repair circuit as screw unit. gearbox and jack-Replace jackscrew
Horizontal Stabilizer Trim Control System - Troubleshooting Chart Figure 101 (Sheet 1)
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A 737-300/400/500MAINTENANCE MANUAL
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
Stabilizer trim system binding or inoperative (Cont) Excessive force required for manual operation fails to sound Warning horn Bad trim control relay or electric circuit Excessive chain tension electric circuit sequence relay or Bad phase Excessive cable tension Bad electric warning circuit Bad auxiliary brake switch Bad warning Check trim control relay circuit for continuity. If 28V DC is present, trim control relay is bad. Check for voltage at input and output side of phase sequence relay. If 28V DC is present, phase sequence relay is bad. Check chain tension (AMM 27-41-41/401). Check cable tension, mis-alignment, rubbing or chafing (AMM 27-41-41/401). Test auxiliary brake Manually operate warning switch to actuate warning horn. If horn does not (AMM 27-41-00/501). sound, circuit is bad. Operate stabilizer outside of green range and position No. 1 or 2 thrust lever full forward. If warning switch does not actuate horn, warning switch is bad. ment). (AMM 27-09-14/ Repair circuit as Repair circuit as sequence relay. Adjust chain (AMM 27-41-41/ 401). required or required or replace phase tension replace trim control relay. Adjust cable tension (AMM 27-41-41/ 401) or repair damage and replace cable as required 201 for cable identification and AMM 20-10-91/401 for cable replace-Repair or replace Repair electric warning circuit Replace warning as required. switch 401) for airplane nose up switch, and as required. auxiliary brake (AMM 31-26-24/ for airplane nose down switch. AMM 27-41-94/401
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