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 C.  Trim servomotor power is controlled by the autopilot stabilizer trim and speed trim circuits in the FCC. Power to the clutch solenoid is supplied through the autopilot trim cutout switch on the control stand. When the autopilot trim cutout switch is placed in the CUTOUT position, power is removed from the motor and clutch solenoid. The stabilizer trim limit switches also remove power from the clutch solenoid. Protection against a hot short (simultaneous trim-up and trim-down command) is provided in the FCC.
 12. Mach Trim Actuator
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 A.  The mach trim actuator converts electrical signals to mechanical to trim the elevator at high mach numbers.
 B.  The mach trim actuator is located in the tail cone area above the elevator feel and centering unit. The mach trim actuator consists of a servomotor, position sensor, limit stops, gearbox, brake and actuator screw. The ac motor powers the gearbox which drives the actuator. The control voltage from the FCC provides the directional drive control and brake release.
 C.  Airplane speed is monitored and when within the mach tuck region, a signal is provided to drive the actuator to the retract direction. This provides an up elevator displacement to counteract the mach tuck pitch down. Actuator extension varies with speed within the mach tuck region.
 13. Switches, Lights and Aural Alert Unit
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 A.  Autopilot Disengage Switches
 (1)  The A/P disengage switches are located on the outboard horns of the pilot's control wheels. The switches disengage the A/P and reset the disengage lights and aural warning. The switch NC (normally closed) contacts are in the A/P engage circuit and the NO (normally open) contacts are in the reset circuit.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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737-300/400/500MAINTENANCE MANUAL
TO/GA Switches
 (1)  
The Takeoff Go-Around (TO/GA) switches are located on the aft edge of each thrust lever. The switches are positioned to operate with a fingertip, while holding the thrust lever handles. Pressing either switch, initiates takeoff or go-around for both the autothrottle and the A/P-F/D, assuming the appropriate mode interlock requirements are satisfied.

Auto Stab Trim Cutout Switch

 (1)  
The A/P AUTO STAB TRIM CUTOUT switch is located on the lower right corner of the control stand. It is a two-position switch, NORMAL and CUTOUT, which provides stabilizer trim clutch control. The switch must be in NORMAL position to permit A/P engagement and automatic stab trim operation.

Control Column Switches

 (1)  
The CONTROL COLUMN SWITCHES disconnect the output of the FCC from the stabilizer trim servo when column force is opposite to stabilizer trim. The column switching module is located below the cabin floor at the lower end of the control column. It is attached to the torque tube which connects the two columns.

STAB OUT OF TRIM Annunciator

 (1)  
The STAB OUT OF TRIM annunciator light on the right edge of the P1 panel illuminates amber when an A/P system is engaged and a sustained stabilizer out of trim condition exists. The light will extinguish when the A/P is disengaged or the out of trim condition is nulled.

ALTITUDE ALERT Annunciator

 (1)  
The ALTITUDE ALERT annunciators, located on the P1 and P3 panels, illuminate steady when approaching a selected altitude (between 900 and 300 feet) and a flashing light and aural alert come on when an altitude error exists (beyond 300 feet).

SPEED TRIM FAIL Annunciator

 (1)  
The SPEED TRIM FAIL Annunciator is illuminated if both SPEED TRIM systems fail. If a single system fails, an automatic transfer is made to the second system; therefore, the annunciator does not illuminate for a single failure. However, the master caution system stores in memory the single fault. Pressing the master caution system annunciator assembly turns on the SPEED TRIM FAIL and FLT CONT annunciator if a single fault exists.

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