(j)  
Measure the control column move from the neutral position. 1) Adjust the protractor to the center. 2) Make a record of the angle on the protractor and subtract

 it from the neutral angle. 3) Make sure the difference is 3.7-5.5 degrees.

 (k)  
Put the control column to the neutral position.

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

 S 865-069
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A
747-400 MAINTENANCE MANUAL
 L. Do a Test of the Hydraulic Brakes
 S 715-092
 (1)  Do the operational test of the stabilizer trim hydraulic brakes in paragraph 10.
 TASK 27-41-00-715-091
 10. Operational Test - Stabilizer Trim Hydraulic Brakes___________________________________________________
 A. 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

 B.
Access

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

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

 C.
Procedure

 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 015-099
 (1)  
Open horizontal stabilizer jackscrew access door 312A (AMM 06-09-05/201).

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

 S 865-100
 S 865-101
 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).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 S 735-049
 (4)  
Do a test of the left hydraulic brake:

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

 (b)  
Set the STAB TRIM 2 switch to CUTOUT.

 (c)  
Push the manual brake bypass valve switch (which is referred to as the "bypass valve switch") on the left stabilizer trim control module (STCM). 1) Hold the bypass valve switch in this position. 2) Hold the STAB TRIM ALTN switches on the control stand to

 the APL NOSE UP position for ten seconds. 3) Make sure that there is no movement of the stabilizer ballscrew. 4) Release the bypass valve switch.

 (d)  
Hold the STAB TRIM ALTN switches to the APL NOSE DN position for five seconds. 1) Make sure the stabilizer position indicators move to APL

 NOSE DN.

 (e)  
Hold the STAB TRIM ALTN switches to the APL NOSE UP position for five seconds. 1) Make sure the stabilizer position indicators move to APL

 NOSE UP.

 (f)  
Push the bypass valve switch on the left STCM. 1) Hold the bypass valve switch in this position. 2) Hold the STAB TRIM switches on the captain's control wheel

 to the NOSE UP position for ten seconds. 3) Make sure that there is no movement of the stabilizer ballscrew. 4) Release the bypass valve switch.

 (g)  
Hold the STAB TRIM switches on the captain's control wheel to the NOSE DN position for five seconds. 1) Make sure the stabilizer position indicators move to APL

 NOSE DN.

 (h)  
Hold the STAB TRIM switches on the captain's control wheel to the NOSE UP position for five seconds. 1) Make sure the stabilizer position indicators move to APL
　
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