212  Passenger Cabin, RH (Second and third center ceiling panels counting from forward end)
 E.  Prepare for Removal
 S 864-002
 (1)  
For applicable system, open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P7 Overhead Circuit Breaker Panel
 1) 7D8 FLT CONT CMPTR PWR L
 2) 7D13 FLT CONT CMPTR PWR C
 3) 7D15 FLT CONT CMPTR PWR R
 4) 7D7 FLT CONT CMPTR SERVO L

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A 747-400 MAINTENANCE MANUAL
1.
 CONTROL WHEEL

2.
 COVER

4. TERMINAL BLOCK
STAB TRIM AND5. WIRE BUNDLE AUTOPILOT WIRE CONNECTIONS
3. SPONGE RUBBER PAD
CAPTAIN'S CONTROL WHEEL STABILIZER TRIM CONTROL SWITCH AND WIRE BUNDLE
9.COTTER PIN
10. CLIP
6. GEAR AND 8. NUT
SLEEVE 7. GUIDE WASHER
22. BOLT
11.
 WASHER

12.
 NUT (2 LOCATIONS)

SPRING
13. APPROACH 27 INCHES
A
PLATE
A
14. SCREW 16. SCREW (4 LOCATIONS)(2 LOCATIONS 15. MEDALLION
18. WASHER 
20. MOUNTING BOLT  17. SCR EW 
(3 LOCATIONS  (4 LOCAT IONS) 
19. WASHER 
21. CONTROL COLUMN  SCREWWASHER 
AND HOUSING  WASHER  CABLE 
A-A 
STAB TRIM 
SWITCH 
TERMINAL BLOCK 

AILERON CONTROL WHEEL
B-B Aileron Control Wheel Installation Figure 401
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A

747-400
MAINTENANCE MANUAL

BLACK/BROWN
23.
 MICROPHONE SWITCH

24.
 MICROPHONE SWITCH

AND TRIGGER ASSEMBLY BLACK/RED
25.
 INTERPHONE SWITCH

26.
 SWITCH PLATE

27.
 AUTOPILOT
DISENGAGE
SWITCH

28.
 SCREW

LEFT SIDE HANDLE

INTERPHONE AND MICROPHONE SWITCH WIRING ONLY
Control Wheel Wiring Details Figure 402
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A

747-400
MAINTENANCE MANUAL

STRAIGHTEDGE 
FIRST OFFICER'S 
CONTROL WHEEL 
CAPTAIN'S 
CONTROL 
WHEEL 

FIRST OFFICER'S CONTROL COLUMN
AILERON CONTROL LOAD LIMITER
RIGGING PIN A/S-1
Aileron Control Wheel Neutral Position and Rig Pin A/S-1 Location Figure 403
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A
747-400 MAINTENANCE MANUAL
 5) 7D12 FLT CONT CMPTR SERVO C
 6) 7D14 FLT CONT CMPTR SERVO R
 7) 7E9 MCP L
 8) 7E18 MCP R
 9) 7E24 AUTO FLT WARN
 10) 7E6 STAB TRIM CONT L
 11) 7E19 STAB TRIM CONT R
 12) 7A20 AUDIO CAPT
 13) 7A21 AUDIO F/O

 S 844-004
 (2)  
Release pressure from hydraulic systems No. 1, 2, 3, and 4
 (AMM 29-11-00/201).

 S 864-005

 (3)  
Move aileron control wheels to the neutral position.

 S 014-006

 (4)  
Open the 2nd and 3rd ceiling panels at the center.
　
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