(c)  
Hold the STAB TRIM ALTN switches to APL NOSE DN. 1) Make sure the stabilizer position indicators show no

 movement. 2) Release the STAB TRIM ALTN switches.

 (d)  
Hold the STAB TRIM switches on the captain's control wheel to NOSE DN. 1) Set the STAB TRIM 3 switch to AUTO.

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747-400 MAINTENANCE MANUAL
 2)  Make sure the stabilizer position indicators move to APL NOSE DN.
 NOTE: There is a 5 second delay when you move the STAB
____ TRIM switch from CUTOUT to AUTO.
 3) Set the STAB TRIM 3 switch to CUTOUT and STAB TRIM 2 switch to AUTO. 4) Make sure the stabilizer position indicators move to APL NOSE DN.
 NOTE: There is a 5 second delay when you move the STAB
____ TRIM switch from CUTOUT to AUTO.
 (e)  Set the STAB TRIM 3 switch to AUTO.
 S 865-030
 (4)  
If the hydraulic power is not necessary, do this task: "Remove Hydraulic Power" (AMM 29-11-00/201).

 S 865-031

 (5)  
If the electrical power is not necessary, do this task: "Remove Electrical Power" (AMM 24-22-00/201).

 TASK 27-41-00-715-108
 8.  Stabilizer Trim Single Switch Test__________________________________
 A.  References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 29-11-00/201, Main Hydraulic Supply System

 B.  
Access

 (1)  
Location Zones
 221, 222 Control Cabin

 C.  
Procedure

 (1)
Do this task: "Supply Electrical Power" (AMM 24-22-00/201).

 S 865-109
 S 865-121
 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).
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 S 865-110
 (3)  Put the STAB TRIM 2 and the STAB TRIM 3 switches on the control stand to AUTO.
 S 865-123
 (4)  Open these circuit breakers and attach DO-NOT-CLOSE tags: (a) P7, Overhead Circuit Breaker Panel 1) 7E7, STAB TRIM L S/O VLV 2) 7E20, STAB TRIM R S/O VLV

 S 865-125
 (5)  
Move the two alternate stab trim switches to the APL NOSE DN position.

 (a)  
Make sure the stabilizer moves in the airplane nose down direction.

 S 865-112
 (6)  
Move the two alternate stab trim switches to the APL NOSE UP position.

 (a)  
Make sure the stabilizer moves in the airplane nose up direction.

 S 865-126
 (7)  
Make sure the stabilizer is between 6 and 9 units of stabilizer trim.

 S 865-113

 (8)  
Move the left alternate stabilizer trim switch to the APL NOSE UP position.

 (a)  
Make sure the stabilizer does not move.

 S 865-114
 (9)  
Move the left alternate stabilizer trim switch to the APL NOSE DN position.

 (a)  
Make sure the stabilizer does not move.

 S 865-115
 (10)
 Move the right alternate stabilizer trim switch to the APL NOSE UP position.

 (a)  
Make sure the stabilizer does not move.

 S 865-116
 (11)
 Move the right alternate stabilizer trim switch to the APL NOSE DN position.

 (a)  
Make sure the stabilizer does not move.

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