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27-41-02
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A
747-400 MAINTENANCE MANUAL
STABILIZER TRIM CONTROL MODULE - MAINTENANCE PRACTICES
______________________________________________________
1. General_______
A. This procedure has 14 tasks. The tasks are for the removal, the installation, and the operational tests of the stabilizer trim control module (STCM) and its components. The procedure has these parts:
(1)
The removal of the STCM
(2)
The installation of the replacement STCM
(3)
An operational test of the STCM
(4)
The removal of the STCM pressure switch
(5)
The installation of the replacement pressure switch
(6)
The removal of the STCM solenoid valves assembly
(7)
The installation of the replacement solenoid valves assembly
(8)
The removal of the STCM motor operated shutoff valve (which is referred to as the "shutoff valve")
(9)
The installation of the replacement shutoff valve
(10)
An operational test of the shutoff valve
(11)
The removal of the STCM shutoff valve electric motor (which is referred to as the "electric motor")
(12)
The installation of the replacement electric motor
(13)
The removal of the STCM filter screen
(14)
The installation of the replacement filter screen.
B.
The STCM gives trim direction, and fast or slow rate control to the stabilizer trim actuator assembly. The removal and installation procedure is the same for the left or the right STCM.
TASK 27-41-04-002-001
2. Stabilizer Trim Control Module Removal (Fig. 201)______________________________________
A. References
(1)
AMM 06-09-05/201, Body Section 48 Access Doors and Panels
(2)
AMM 24-22-00/201, Manual Control
(3)
AMM 29-11-00/201, Main Hydraulic Supply System
B.
Access
(1)
Location Zone
311 Area Aft of Pressure Bulkhead, LH
312 Area Aft of Pressure Bulkhead, RH
(2)
Access Panel 312A Horizontal Stabilizer Jackscrew Access Door
C.
Procedure
(1)
Do this task: "Supply Electrical Power" (AMM 24-22-00/201).
(2)
Set the STAB TRIM 2 and 3 switches on control stand to CUTOUT.
S 862-002
S 862-003
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27-41-04
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747-400 MAINTENANCE MANUAL
FWD
RATE CONTROL SOLENOID
HYDRAULIC
BULKHEAD CONNECTIONS
ELECTRICAL
1. STABILIZER TRIM CONNECTORS
CONTROL MODULES
SEE A
ARM AND BULKHEAD CONTROL
SOLENOIDS
1. STABILIZER TRIM SEE B
CONTROL MODULE
2. MOUNTING BRACKET
PRESSURE SWITCH
SEE B
3.
BOLT
4.
WASHER (QTY 2)
ELECTRICAL5. NUT CONNECTOR(4 LOCATIONS) ELECTRICAL CONNECTOR
HYDRAULIC CONNECTIONS
MANUAL BRAKE
BYPASS VALVE MOTOR OPERATED
FWDSHUTOFF VALVE
A
SEE B
Stabilizer Trim Control Module and Components Installation Figure 201 (Sheet 1)
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A 747-400 MAINTENANCE MANUAL
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