(c)  
Select the stabilizer in the airplane nose down (stabilizer leading edge up) direction by moving either the STAB TRIM switches on captain's or first officer's control wheel upwards. Movement continues while switch selection is maintained until terminated by the action of the airplane nose down manual-electric limit switch. Movement may be arrested before limit switch operation by releasing the STAB TRIM switch.

 NOTE: Both segments of the switch must be selected in the same
____ direction to activate the stabilizer. With only one segment selected, or with segments displaced in opposite directions, the stabilizer remains stationary. If the captain's and first officer's STAB TRIM switches are inadvertently selected in opposite directions simultaneously, the stabilizer remains stationary. No adverse effects can result from this selection.
 (d)  
Select the stabilizer in the airplane nose up (stabilizer leading edge down) direction by moving either STAB TRIM switches on captain's or first officer's control wheel downwards. Movement continues while switch selection is maintained until terminated by the action of the airplane nose up manual-electric limit switch incorporated within the SRM. Movement may be arrested by releasing the STAB TRIM switches.

 (3)  
Release the pressure in hydraulic systems No. 2 and/or 3 if no longer required (Ref 29-11-00/201).

 (4)  
Remove electrical power if no longer required (Ref 24-22-00/201).

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 27-41-00
 ALL  ú ú 08 Page 16 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 HORIZONTAL STABILIZER TRIM CONTROL SYSTEM - MAINTENANCE PRACTICES
_________________________________________________________________
 1.  General_______
 A.  This subject has two tasks. The first task is the operation of the stabilizer jackscrew with the 3MIT65B80713 air motor tool. The second task is the adjustment to set the stabilizer to the neutral rig position. The procedure has these parts:
 (1)  
The operation of the horizontal stabilizer with the air motor tool

 (2)  
The adjustment to set the stabilizer to the neutral rig position.

 TASK 27-41-00-862-001
 2.  Horizontal Stabilizer Operation With Air Motor (Fig. 201)______________________________________________
 A.  Special Tools and Equipment
 (1)  
3MIT65B80713 - Air Motor Tool

 (2)  
3MIT65B80713-11 - Dust Cover

 (3)  
3MIT65B80713-8 - Adapter

 (4)  
3MIT65B80713-2 - Power Wrench

 B.  
References

 (1)  
AMM 06-09-05/201, Body Section 48 Access Doors and Panels

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

 (3)  
AMM 27-41-05/401, Stabilizer Trim Hydraulic Brake

 (4)  
AMM 27-41-10/401, Stabilizer Trim Hydraulic Motor

 (5)  
AMM 29-11-00/201, Main Hydraulic Supply System

 (6)  
AIPC 27-41-05 Fig. 1

 (7)  
AIPC 27-41-10 Fig. 1

 C.  
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

 D.  
Procedure

 S 862-002
 (1)  
Do this task to depressurize the hydraulic systems No. 2 and No. 3: "Hydraulic System Depressurization" (AMM 29-11-00/201).

 S 862-003

 (2)  
Make sure there is no electrical power.

 (a)  
If it is necessary, do this task: "Remove Electrical Power" (AMM 24-22-00/201).

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

 S 022-005

 (4)  
Do this task to remove one hydraulic motor: "Stabilizer Trim Hydraulic Motor Removal" (AMM 27-41-10/401).

 S 012-004
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