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A
747-400 MAINTENANCE MANUAL
STABILIZER MANUAL TRIM CONTROL WHEEL SWITCH - REMOVAL/INSTALLATION
__________________________________________________________________
1. General_______
A. This procedure has two tasks, one for the removal and one for the installation of the stabilizer manual trim control wheel switch (which is referred to as the "stabilizer trim switch"). The procedure has these parts:
(1)
The removal of the stabilizer trim switch
(2)
The installation of the replacement switch
(3)
An operational test of the stabilizer trim switch.
B.
The removal and installation procedure is the same for the two stabilizer trim switches. If a switch becomes defective, the switch and the cables are replaced as an assembly.
TASK 27-41-11-004-001
2. Stabilizer Manual Trim Control Wheel Switch Removal (Fig. 401)___________________________________________________
A. Special Tools and Equipment
(1)
M15570-20 - Insertion and Extraction Tool, The Deutsch Co., 7001 West Imperial Highway, Los Angles, Calif. 90045
B.
References
(1)
AIPC 27-31-04, Fig. 3
(2)
WDM 27-41-11
C.
Access
(1)
Location Zone
221 Control Cabin, LH
222 Control Cabin, RH
D.
Procedure
S 864-003
(1)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a)
P7, Overhead Circuit Breaker Panel
1) 7E6, STAB TRIM L CONT
2) 7E7, STAB TRIM L S/O VLV
3) 7E8, STAB TRIM L RATE
4) 7E19, STAB TRIM R CONT
5) 7E20, STAB TRIM R S/O VLV
6) 7E21, STAB TRIM R RATE
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747-400 MAINTENANCE MANUAL
CONTROL COLUMN
1. TRIM CONTROL SWITCH
1
SEE A STAB TRIM AND AUTOPILOT WIRE CONNECIONS (JIFFY JUNCTION MODULES) SPONGE RUBBER
WIRE BUNDLE
PAD
1 CAPTAIN'S CONTROL WHEEL SHOWN. FIRST OFFICER'S OPPOSITE.
3. PAN HEAD 4. INSULATOR
A
MACHINE SCREWS
INTERPHONE STABILIZER TRIM
SWITCH A CONTROL SWITCH
INTERPHONE
SWITCH
WIRES
CONTROL WHEEL HANDLE TERMINALS (4 LOCATIONS)
CONTROL WHEEL
2. TERMINAL BLOCK (4 SCREW-TYPE CONNECTIONS)
MEDALLION AND APPROACH PLATE
0.002 INCH MIN
(0.05 mm)
A-A
JIFFY JUNCTION MODULE (1 LOCATION)
A
Horizontal Stabilizer Trim Control Switch Installation
Figure 401 (Sheet 1)
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747-400
MAINTENANCE MANUAL
10. APPROACH
PLATE
9. MEDALLION
7. CONTROL WHEEL
5. CONTROL COLUMN 6. WIRE
BUNDLE 8. SCREW 11. NUT
(2 PLACES) (2 PLACES)
BOLTS
12. SCREW (3 PLACES)WIRE CONNECTIONS
A-A
Horizontal Stabilizer Trim Control Switch Installation
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