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 movement. 6) Release the STAB TRIM ALTN switches.
 (b)  Make sure the left shutoff valve is open: 1) Set the STAB TRIM 3 switch to ON. 2) Hold the STAB TRIM switches on the captain's control wheel
 to NOSE DN. 3) Make sure the stabilizer position indicators move to APL
 NOSE DN. 4) Release the STAB TRIM switches. 5) Set the STAB TRIM 3 switch to CUTOUT.
 (c)  Make sure the right shutoff valve is open: 1) Set the STAB TRIM 2 switch to ON. 2) Hold the STAB TRIM switches to NOSE DN. 3) Make sure the stabilizer position indicators move to APL
 NOSE DN. 4) Release the STAB TRIM switches.
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747-400 MAINTENANCE MANUAL
 5) Set the STAB TRIM 2 and 3 switches to AUTO.
 S 862-128
 (4)  
If the hydraulic power is not necessary, do this task: "Remove Hydraulic Power" (AMM 29-11-00/201).

 S 862-100

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

 TASK 27-41-04-002-123
 12. Shutoff Valve Electric Motor Removal (Fig. 201)____________________________________
 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
 311 Area Aft of Pressure Bulkhead, LH
 312 Area Aft of Pressure Bulkhead, RH

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

 C.
Procedure

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

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

 S 872-130

 (3)  
Decrease the remaining pressure in the hydraulic system:

 (a)  
Operate the STAB TRIM ALTN switches to APL NOSE UP and APL NOSE DN three times.

 S 862-092
 S 862-093
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747-400 MAINTENANCE MANUAL
 (b)  Attach the DO-NOT-MOVE tags to the STAB TRIM ALTN switches on the control stand.
 S 862-096
 (4)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P7, Overhead Circuit Breaker Panel
 1) 7E6, STAB TRIM L CONT
 2) 7E7, STAB TRIM L S/O VLV
 3) 7E19, STAB TRIM R CONT
 4) 7E20, STAB TRIM R S/O VLV

 

 S 862-097
 (5)  
If the electrical power is not necessary, do this task: "Remove Electrical Power" (AMM 24-22-00/201).

 S 012-098

 (6)  
Open the access door 312A (AMM 06-09-05/201).

 S 022-091

 (7)  
Remove the shutoff valve (18):

 (a)  
Disconnect the electrical connector DB188C or DB189C from the shutoff valve (18).

 (b)  
Move the manual override lever to position 2.

 (c)  
Remove the screws (19) that attach the electric motor (16) to the shutoff valve (18).

 (d)  
Remove the electric motor (16) from the shutoff valve (18).

 S 032-119
 (8)  
If there is an identification plate (17) on the electric motor (16), remove the identification plate (17).

 (a)  
Keep the identification plate (17) for installation on the replacement electric motor.

 TASK 27-41-04-402-124
 13. Shutoff Valve Electric Motor Installation_________________________________________
 A. Consumable Materials
 (1) C00308 Corrosion Preventive Compound - MIL-C-11796, Class 3
 B. Parts ~.............................................................................. | AMM | | AIPC | ................. ............................ | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ................................................................................ | 201 | 16 | Electric Motor | 27-41-04 | 05 | 116 | | | 19 | Screw | | | 117 | 2......…........…...................................…...........….....…........1
　
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