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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 D. Put the Airplane Back to Its Usual Condition
 S 865-127
 (1)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

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

 S 865-119
 (2)  
If the hydraulic power is not necessary, do this task: "Remove Hydraulic Power" (AMM 29-11-00/201).

 S 865-120

 (3)  
If the electrical power is not necessary, do this task: "Remove Electrical Power" (AMM 24-22-00/201).

 TASK 27-41-00-735-032
 9.  System Test - Stabilizer Trim Control System____________________________________________
 A. General
 (1)  
This task is a system test of the stabilizer trim control system. To do this test you will operate the stabilizer trim control system. During the test, it is necessary to monitor the stabilizer position indicators for the stabilizer movement. The stabilizer position indicating system and the elevator control system must be in the satisfactory condition before you do this test.

 B.
Special Tools and Equipment

 (1)  
4MIT65B80307-1 Protractor Assembly (Recommended)

 (2)  
F52485-500 Protractor Assembly (Alternative)

 (3)  
3MIT65B80307-1 Control Wheel Adapter

 C.
References

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

 (2)  
AMM 22-22-00/501, Automatic Stabilizer Trim System

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

 (4)  
AMM 27-41-00/201, Horizontal Stabilizer Trim Control System

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

 (6)  
AMM 32-09-02/201, Air/Ground Relay System

 D.
Access

 (1)  
Location Zone
 221, 222 Control Cabin
 311, 312 Area Aft of Pressure Bulkhead

 (2)  
Access Panel 312A Horizontal Stabilizer Jackscrew Access Door

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 E. Prepare for Test
 NOTE: Control columns must not be held in the neutral during this test
____ unless the instructions tell you differently. The elevator control actuated limit switches can prevent the operation of the stabilizer when you move the control column.
 S 015-033
 (1)  
Open horizontal stabilizer jackscrew access door 312A
 (AMM 06-09-05/201).

 S 865-034

 (2)  
Do this task: "Supply Electrical Power" (AMM 24-22-00/201).

 S 865-058
 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.
 (3)  
Do this task to pressurize the hydraulic systems No. 2 and No. 3: "Supply Hydraulic Power" (AMM 29-11-00/201).

 F.
Do a Test of the Horizontal Stabilizer Control System

 S 735-124
 CAUTION: MAKE SURE THE AIRPLANE IS NOT ON JACKS DURING THE SYSTEM TEST
_______ OF THE STABILIZER TRIM CONTROL SYSTEM. A JACK OR TAIL STAND AT TAIL JACK POINT III IS PERMITTED WHEN THE LOAD IS LESS THAN 2000 POUNDS. THIS IS TO PREVENT THE POSSIBLE DAMAGE TO EQUIPMENT.
 (1)  
Do this operational test of the horizontal stabilizer:

 (a)  
Set the STAB TRIM 2 switch on the control stand to CUTOUT and the STAB TRIM 3 switch to ON.

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