747-400
MAINTENANCE MANUAL

TRIM CONTROLS SEE
A FLIGHT COMPARTMENT
FASTENER FOR THE TRIM MODULE (4 LOCATIONS)

RUDDER TRIM INDICATOR
LIGHTPLATE
RUDDER
TRIM KNOB
AILERON AND RUDDER TRIM MODULE

A

Aileron and Rudder Trim Module
Figure 201

D21634
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 27-21-09
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 ú  01  Page 202
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 A. References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 27-11-00/501, Aileron and Aileron Trim Control System

 (3)  
AMM 27-21-00/501, Rudder and Rudder Trim Control System

 B.
Access

 (1)  
Location Zones
 221/222 Control Cabin

 C.
Procedure

 S 422-024
 (1)  
Install the aileron and rudder trim control module:

 (a)  
Connect the two electrical connectors to the bottom of the trim module.

 (b)  
Put the trim module in its correct position.

 (c)  
Tighten the four fasteners that connect the trim module to the aft electronic control panel, P8.

 (d)  
Make sure the trim module is tightly install in its position.

 S 862-007
 (2)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  
P7, Overhead Circuit Breaker Panel
 1) 7D16, RUD TRIM CONT
 2) 7D17, AILERON TRIM

 S 862-008
 (3)  
Remove the DO-NOT-OPERATE tags and move the FLT CONTROL SHUTOFF TAIL switches No. 1, 2, 3 and 4 on the overhead panel to ON.

 S 712-009

 (4)  
Do the test for the aileron trim actuator operation in the
 operational test of the aileron trim control system
 (AMM 27-11-00/501).

 S 862-010

 (5)  
Do the tests for the rudder trim system and the center switch in the operational test of the rudder trim control system (AMM 27-21-00/501).

 S 212-011

 (6)  
Make sure the trim switch knob does not touch the lightplate surface during its operation.

 D.
Put the Airplane Back to Its Usual Condition

 (1)  
Remove electrical power (AMM 24-22-00/201).

 S 862-012
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 TASK 27-21-09-102-013
 4. Clean the Rudder Trim Switch
____________________________
 A. Consumable Materials
 (1)  
B00157 Detergent - Spray White E or equivalent

 (2)  
B00454 Cleaner - Winsol, APC-120-WX

 B.
References

 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 25-00-00/701, Equiment/Furnishing

 (3)  
AMM 27-21-00/501, Rudder and Rudder Trim Control System

 C.
Access

 (1)  
Location Zones
 221/222 Control Cabin

 D.
Prepare to Clean

 S 862-014
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 862-015

 (2)  
Put the FLT CONTROL HYD POWER - TAIL switches No. 1, 2, 3 and 4 on the overhead panel to the SHUTOFF position and attach DO-NOT-OPERATE tags.

 S 862-016

 (3)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P7, Overhead Circuit Breaker Panel
 1) 7D16, RUD TRIM CONT
 2) 7D17, AILERON TRIM

 E.
Procedure

 S 112-017
 (1)  
　
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