Mach Trim Actuator Installation
Figure 401 (Sheet 2)
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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 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：737-300 400 500 AMM 飞机维护手册 自动飞行 AUTOFLIGHT 2(119)
