(2)  
Access Panel
 312AR Service Access Door

 D.  Prepare to Remove the Pivot Pin
 S 864-073
 WARNING: APPLY ELECTRICAL POWER TO OPEN THE STABILIZER TRIM SHUTOFF AND
_______ PREVENT HYDRAULIC OPERATION OF THE HORIZONTAL STABILIZER. IF ELECTRICAL POWER IS NOT AVAILABLE, ATTACH A PLACARD TO THE MANUAL CONTROL LEVERS FOR THE HORIZONTAL STABILIZER. ACCIDENTAL OPERATION OF THE HORIZONTAL STABILIZER CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (1)  Put the leading edge of the horizontal stabilizer up (nose-up) before you open the circuit breakers.
 NOTE: This position will give you the best access when you remove
____
 and install the pivot pin.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 55-17-51
 ALL  ú ú 01 Page 401 ú Oct 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 
747-400 
MAINTENANCE MANUAL 
HORIZONTAL STABILIZER 
PIVOT FITTING 
SEE  A 
313AL 
LOWER SEAL 
FAIRING 
312AR  HORIZONTAL 
STABILIZER 
OUTBOARD HINGE 
A 
INBOARD HINGE 
SEE  B 
SEE  C 
A 
HORIZONTAL 
STABILIZER 
FWD  INBD 
HORIZONTAL STABILIZER 
PIVOT FITTING 
A 
Horizontal Stabilizer Pivot Pin 
Figure 401 (Sheet 1)

 E30554
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 55-17-51
 ALL  ú ú 01 Page 402 ú Oct 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
5. PIVOT 6. PIVOT FITTING
FITTING BEARING RETAINERHINGE

Horizontal Stabilizer Pivot Pin
Figure 401 (Sheet 2)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 55-17-51
 ALL  ú ú 01 Page 403 ú Oct 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
E29033
A

747-400
MAINTENANCE MANUAL

HORIZONTAL STABILIZER PIVOT FITTING 
B  B 
HORIZONTAL STABILIZER 
85.00  "G" 85.06 84.94  INCHES 

B-B

Horizontal Stabilizer Pivot Pin
Figure 401 (Sheet 3)

G87051
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 55-17-51
 ALL  ú ú 01 Page 404 ú Oct 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (2)  S 864-004Put the STAB TRIM NO. 2 and NO. 3 HYD switches on the control stand in the CUTOUT position.
 (3)  S 864-005Open these circuit breakers on the overhead circuit breaker panel, P7, and attach DO-NOT-CLOSE tags: (a) 7E7, STAB TRIM L S/O VALVE. (b) 7E20, STAB TRIM R S/O VALVE.
 S 014-074

 WARNING: BEFORE YOU BEGIN TO WORK, MAKE SURE THAT THERE IS NO MOVEMENT
_______ OF THE HORIZONTAL STABILIZER.
 (4)  Open the Service Access Door, 312AR (AMM 06-09-05/201).
 S 944-008
 WARNING: MAKE SURE THE SERVICE PLATFORM IS INSTALLED ABOVE THE SERVICE
_______ ACCESS DOOR OPENING. IF YOU DO NOT INSTALL THE SERVICE PLATFORM, YOU CAN FALL THROUGH THE SERVICE ACCESS DOOR OPENING AND INJURY CAN OCCUR.
 (5)  
Install the service platform above the opening of the service access door.

 S 494-010

 (6)  
Install the horizontal stabilizer jacking equipment.

 S 494-011

 (7)  
Attach the dial indicator bracket to the flange of an intercostal bracket above and behind the torque box.
　
中國航空網(wǎng) www.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：747-400 AMM 飛機(jī)維護(hù)手冊(cè) 安定門 STABILIZERS(11)