S 864-027
 (8)  If it is necessary, push the button on the differential pressure indicator until it aligns with the adjacent surface.
 TASK 27-41-15-404-012
 3.  Stabilizer Trim Return Filter Element Installation__________________________________________________
 A. Consumable Materials
 (1)  
D00153 Fluid - Hydraulic Fire Resistant, BMS 3-11

 B.
References

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

 (2)  
AMM 12-12-01/301, Hydraulic System

 (3)  
AMM 24-22-00/201, Manual Control

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

 (5)  
AIPC 27-41-15, Fig. 2

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747-400
MAINTENANCE MANUAL

 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 024-013
 (1)  
Install the filter element (Fig. 401).

 (a)  
Lubricate the O-rings with hydraulic fluid.

 (b)  
Install the O-rings on the filter element.

 (c)  
Put the filter element in the filter element housing.

 (d)  
Install the filter element housing on the filter module. 1) Install the lockwire.

 (e)  
Make sure that the O-rings engage smoothly.

 S 434-014
 (2)  
Connect the hydraulic line H1 (Fig. 401).

 S 614-023

 (3)  
Fill the hydraulic reservoir (AMM 12-12-01/301).

 S 714-015

 (4)  
Do this task: "Operational Test - Stabilizer Trim Hydraulic Motor" (AMM 27-41-10/401).

 S 864-016

 (5)  
Do this task: "Supply Electrical Power" (AMM 24-22-00/201).

 S 864-017

 (6)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  
P7, Overhead Circuit Breaker Panel
 1) 7E7, L STAB TRIM S/O VALVE
 2) 7E20, R STAB TRIM S/O VALVE

 S 864-018
 (7)  
Use the STAB TRIM ALTN on the control stand to set the stabilizer to the neutral rig position (3 units of trim).

 (8)  
Examine the filter module for a hydraulic leak.

 (9)  
Set the STAB TRIM 2 and 3 switches to NORM.

 S 794-019
 S 864-020
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747-400 MAINTENANCE MANUAL
 S 864-021
 (10)
 If the electrical power is not necessary, do this task:  "Remove Electrical Power" (AMM 24-22-00/201).

 S 414-022

 (11)
 Close the access door 312A (AMM 06-09-05/201).

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 1.

2.

3.

4.

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747-400 MAINTENANCE MANUAL
 STABILIZER TRIM INDICATING SYSTEM - DESCRIPTION AND OPERATION
_____________________________________________________________
General (Fig. 1)
_______
 A.  The stabilizer trim indicating system provides visual indication on the flight deck of the position of the horizontal stabilizer. Units of stabilizer trim appear on the two stabilizer trim indicators located on either side of the P8 control stand.
　
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