Mach Trim Actuator Installation
Figure 401 (Sheet 2)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 (b)  P18-1 Circuit Breaker Panel
 1) AUTO FLT CONT SYS A MACH TRIM AC
 2) AUTO FLT CONT SYS A MACH TRIM DC

 S 014-004
 (3)  
Remove the 3802 access door on the tail cone (Ref 12-31-41/201).

 S 834-005

 (4)  
Put in the E-5 rigging pin in the aft control quadrant

 E. Remove the mach trim actuator
 S 034-006
 (1)
Disconnect the electrical connector from the mach trim actuator.

 S 034-007

 (2)  
Remove the double bolt, nuts, and washers that connect the actuator jackscrew to the crank of the neutral shift sensor.

 NOTE: Pull up on the aft end of the elevator feel and centering
____ unit to release the load on the bolt.
 S 034-008
 (3)  
Remove the two bolts that attach the mach trim actuator to the elevator feel and centering unit.

 S 024-009

 (4)  
Remove the mach trim actuator.

 TASK 22-21-11-404-006
 3. Mach Trim Actuator Installation (Fig._______________________________401)
 A. Standard Tools and Equipment
 (1)  Rigging Pin - E-5, 0.309/0.311 inch diameter, 3.7 +/- 0.25 inches long (MS20392-4).
 NOTE: This rigging pin is part of F70207-83
____
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737-300/400/500MAINTENANCE MANUAL
 B. References
 (1)  
12-31-41/201, Body Section 48 Access Doors and Panels

 (2)  
27-31-00/201, Elevator Tab and Control System

 C. Access
 (1)  
Location Zone
 705 Tail Cone Access door

 (2)  
Access Panel
 3802 Tail Cone Access Door

 D. Prepare for the Installation
 S 864-008
 (1)  
Remove the hydraulic pressure from the elevator hydraulic systems A and B (Ref 27-31-00/201).

 S 864-011

 (2)  
Make sure that you open these circuit breakers and attach
 DO-NOT-CLOSE tags:

 (a)  
P6-2 Circuit Breaker Panel
 1) AUTO FLT CONT SYS B MACH TRIM AC
 2) AUTO FLT CONT SYS B MACH TRIM DC

 (b)  
P18-1 Circuit Breaker Panel
 1) AUTO FLT CONT SYS A MACH TRIM AC
 2) AUTO FLT CONT SYS A MACH TRIM DC

 S 104-013
 (3)
Remove the access door 3802 on the tail cone (Ref 12-31-41/201).

 S 494-014

 (4)  
Make sure the rigging pin E-5 is installed in the aft control quadrant (Fig. 401).

 E. Procedure
 S 434-015
 (1)  Make sure the bearings and washer are in the correct position - at the mounting points on the feel and centering unit. Detail C on Figure 401 (sheet 2) shows the correct position.
 NOTE: Move the feel and centering unit up or down to put the
____ actuator arm in position. If it is necessary, remove the rigging pin and push the elevator control surface up, or pull aft on the control column.
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A 737-300/400/500MAINTENANCE MANUAL
 S 424-016
 (2)  
Set the actuator on top of the feel and centering unit and put in the mounting bolts on the side.

 S 434-017
　
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