(2)  
AMM 24-22-00/201, Manual Control

 (3)  
AMM 29-11-00/201, Main Hydraulic Supply System

 B.
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

 C.
Procedure

 S 864-024
 (1) Do this task: "Supply Electrical Power" (AMM 24-22-00/201).
 S 864-025
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF ALL CONTROL
_______ SURFACES BEFORE YOU SUPPLY HYDRAULIC POWER. AILERONS, RUDDERS, ELEVATORS, FLAPS, SPOILERS, LANDING GEAR, AND THRUST REVERSERS CAN MOVE QUICKLY WHEN YOU SUPPLY HYDRAULIC POWER. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (2)  
Do this task to pressurize the hydraulic systems No. 2 and No. 3: "Supply Hydraulic Power" (AMM 29-11-00/201).

 (3)  
Open the access door 312A (AMM 06-09-05/201).

 S 714-026

 (4)  
Do this test of the lip seal:

 (a)  
Operate the stabilizer 10 to 15 seconds in two directions.

 (b)  
Set the stabilizer to the neutral rig position (three units of trim).

 (c)  
Examine around the lip seal housing for a hydraulic leak.

 S 014-030
 S 864-028
 (5)  If the hydraulic power is not necessary, do this task: "Remove Hydraulic Power" (AMM 29-11-00/201).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
 (6)  S 864-029If the electrical power is not necessary, do this task: Electrical Power" (AMM 24-22-00/201). " Remove
 (7)  S 414-031Close 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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
 HORIZONTAL STABILIZER BODY SEAL DOOR - MAINTENANCE PRACTICES
____________________________________________________________
 1.  General_______
 A.  This procedure has six tasks. There is one task each for the removal and the installation of the horizontal stabilizer body seal doors (which is referred to as the "body seal door") and the door mechanism. There is also one task for the adjustment of the door mechanism and one task for the operational test of the body seal door. The procedure has these parts:
 (1)
The removal of the body seal doors

 (2)
The installation of the replacement doors

 (3)
The removal of the door mechanism

 (4)
The installation of the replacement door mechanism

 (5)
The adjustment of the door mechanism

 (6)
The operational test of the body seal door.

 B.  
The removal and installation procedures of the body seal doors and their mechanism are the same for the upper and lower seal doors. The upper seal doors are not on all airplanes (See Fig. 202 for effectivity).

 C.  
It is necessary to install an air blower to supply adequate fresh air to the stabilizer box during maintenance.

 TASK 27-41-14-002-001
 2.  Horizontal Stabilizer Body Seal Door Removal (Fig. 201)____________________________________________
 A.  Special Tools and Equipment
 (1)
24MIT65B00002 Safety Device (for Wing and Stabilizer) - lanyard

 (2)
LS1205TB Full Body Harness D. B. Industries

 B.  
Standard Tools and Equipment

 (1)
Air Blower - explosion proof , 90-100 CFM capacity

 (2)
Hose - flexible, sufficient length to reach stabilizer area

 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
　
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