SEE B
SEE A

ACCESS PANEL 315A FWD AFT QUADRANT TORQUE TUBE
A
SERVO ASSEMBLY 
ASSEMBLY CONTROL ROD 
BEARING 3. BOLT/ 
4. BOLT/ELEVATOR INPUT ARM SERVO  AFT QUADRANT TORQUE TUBE 
1. BOLT/OUTPUT CRANK 
1  FLAGNOTE NOT USED  ELEVATOR AUTOPILOT SERVO B 2. BOLT/BEARING
EAS Mechanical Linkage Wear Limits Figure 601 (Sheet 1) 

B88156
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 22-12-01
 ALL  ú ú 02 Page 602 ú Feb 10/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 S 866-010

 (3)  
Put the FLT CONTROL HYD POWER TAIL 1, 2, and 3 switches in the SHUTOFF position. You can find these switches on the Pilots' Overhead Maintenance Panel (P461).

 S 866-011

 (4)  
Put the STAB TRIM 1, and 2 switches in the CUTOUT position. Attach DO-NOT-OPERATE tags to the STAB TRIM 1 and 2 switches. You can find these switches on the Pilots' Control Stand.

 S 866-012

 (5)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P7 Overhead Circuit Breaker Panel:
 1) 7D7, FLT CONT CMPTR L SERVO
 2) 7D8, FLT CONT CMPTR L PWR
 3) 7D12, FLT CONT CMPTR C SERVO
 4) 7D13, FLT CONT CMPTR C PWR
 5) 7D14, FLT CONT CMPTR R SERVO
 6) 7D15, FLT CONT CMPTR R PWR
 7) 7E7, STAB TRIM L S/O
 8) 7E20, STAB TRIM R S/O

 (b)  
P180 DC Power Distribution Panel:
 1) 180E7, ELEV/RUD VLV SYS 2
 2) 180E22, ELEV/RUD VLV SYS 4
 3) 180H8, ELEV/RUD VLV SYS 1
 4) 180H23, ELEV/RUD VLV SYS 3

 S 866-022
 (6)  
Attach DO-NOT-OPERATE tags to the two control columns.

 S 016-013

 (7)  
Open access door 315A to get access to the aft quadrant (AMM 06-09-05/201).

 S 216-021
 WARNING:_______DO NOT TOUCH PNEUMATIC DUCTS WHEN THEY ARE HOT. WHEN THE DUCTS ARE HOT THEY CAN CAUSE INJURY TO PERSONS.
 (8)  Visually examine these parts for bends, cracks, corrosion, or worn areas:
 (a)  
EAS output crank.

 (b)  
Control rod.

 (c)  
Bearings on the control rod.

 (d)  
Bolts and nuts which attach the control rod.

 (e)  
If the condition of the control rod is not satisfactory, refer to AMM 22-12-01/401 to replace the control rod.

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 22-12-01
 ALL  ú ú 01 Page 603 ú Oct 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 E. Put the Airplane Back to Its Initial Condition
 S 866-004
 (1)  
Remove the DO-NOT-OPERATE tags from the control columns.

 S 866-005

 (2)
Remove the DO-NOT-CLOSE tags and close these circuit breakers

 (a)  
P7 Overhead Circuit Breaker Panel:
 1) 7D7, FLT CONT CMPTR L SERVO
 2) 7D8, FLT CONT CMPTR L PWR
 3) 7D12, FLT CONT CMPTR C SERVO
 4) 7D13, FLT CONT CMPTR C PWR
 5) 7D14, FLT CONT CMPTR R SERVO
 6) 7D15, FLT CONT CMPTR R PWR
 7) 7E7, STAB TRIM L S/O
 8) 7E20, STAB TRIM R S/O

 (b)  
P180 DC Power Distribution Panel:
 1) 180E7, ELEV/RUD VLV SYS 2
 2) 180E22, ELEV/RUD VLV SYS 4
 3) 180H8, ELEV/RUD VLV SYS 1
 4) 180H23, ELEV/RUD VLV SYS 3

 S 866-016
 (3)  
Put the FLT CONT HYD POWER TAIL 1, 2, and 3 switches in the NORM position. You can find these switches on the Pilots' Overhead Maintenance Panel (P461).

 S 866-006

 (4)  
Remove the DO-NOT-OPERATE tags and put the STAB TRIM 1, and 2 switches in the ON position.
　
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