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A 747-400 MAINTENANCE MANUAL
 (i)  Push the bypass valve switch on the applicable STCM. 1) Hold the bypass valve switch in this position. 2) Hold the STAB TRIM switches on the first officer's control wheel to the NOSE UP position for ten seconds. 3) Make sure that there is no movement of the ballscrew. 4) Release the bypass valve switch.
 (4)  S 794-029Examine the connections at the hydraulic brake for a hydraulic leak.
 (5)  S 864-030Use the STAB TRIM ALTN switches to set the stabilizer to the neutral position (3 units of trim).
 (6)  S 864-031If the hydraulic power is not necessary, do this task: Hydraulic Power" (AMM 29-11-00/201). "Remove
 (7)  S 864-032If the electrical power is not necessary, do this task: Electrical Power" (AMM 24-22-00/201). "Remove
 (8)  S 414-033Close the access door 312A (AMM 06-09-05/201).

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 STABILIZER TRIM DRIVE MECHANISM - REMOVAL/INSTALLATION
______________________________________________________
 1.  General
_______
 A.  There are two tasks in this procedure. The tasks are the removal and the installation of the stabilizer trim drive mechanism (which is referred to as the "mechanism"). The procedure has these parts:
 (1)
The removal of the mechanism

 (2)
The installation of the mechanism.

 B.  
With the airplane stopped, the force of the stabilizer on the mechanism is about 2600 pounds (11,560 newtons) up. It is therefore necessary to hold the stabilizer during and after removal. The complete mechanism assembly weighs approximately 565 pounds (256 kilograms). You must use the hoist equipment for the removal and the installation.

 TASK 27-41-06-004-001
 2.  Stabilizer Trim Drive Mechanism Removal
_______________________________________
 A.  Special Tools and Equipment
 (1)  
OHME65B80713-1 - Horizontal Stabilizer Jackscrew Gearbox Hoist Equipment

 (2)
ME65B80713-1 - Jackscrew Gearbox Ball Nut Lock

 (3)
FME65B80713-1 - Horizontal Stabilizer Actuator Stand

 (4)
G27030-1 - Horizontal Stabilizer Actuator Torque Adapter

 B.  
Standard Tools and Equipment

 (1)  
Hoist - C.M. Puller Model B, Code No. 4043, 3/4-ton capacity (680 kilogram), minimum hook distance 10-3/4 inches (273 millimeters), maximum lift 30 feet (9.1 meters) (or equivalent) Columbus McKinnon Corporation C-M Hoist Division 140 John James Audubon Pkwy Amherst, New York 14228-1197 Telex: 6854301 FAX: (716) 689-5645

 (2)
Bucket - 1 gallon (3.8 liters) capacity (for hydraulic fluid)

 (3)
Torque Wrench - 1/2", 0-50 pound-feet (0-68 newton-meter) capacity

 C.  
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

 (4)
AIPC 27-41-06, Fig. 1

 D.  
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

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

SPREADER BAR
BALL LOCKPIN
JAMNUT
HANGER
SEE

DOOR 312A

Stabilizer Trim Drive Mechanism Handling Equipment
Figure 401 (Sheet 1)

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