(a)  
Hold the STAB TRIM ALTN switches to APL NOSE DN until the stabilizer moves.

 (b)  
Make sure the stabilizer position indicators start to move in one second and the leading edge moves up.

 (c)  
Hold the STAB TRIM switches to NOSE UP until the stabilizer moves. 1) Make sure the stabilizer position indicators start to move

 in one second and the leading edge moves down.

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

 (3)  
Examine the hydraulic connections for leaks.

 S 792-027
 TASK 27-41-04-002-028
 5.  Pressure Switch Removal (Fig. 201)_______________________
 A. References
 (1)  
AMM 06-09-05/201, Body Section 48 Access Doors and Panels

 B.
Access

 (1)  
Location Zone
 311 Area Aft of Pressure Bulkhead, LH
 312 Area Aft of Pressure Bulkhead, RH

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

24.
 CAP

25.
 PRESSURE INLET UNION

26.
 O-RING

27.
 SCREEN FILTER

23. RETAINER
23. RETAINER
22. RETAINER
21. WASHER
20. SCREW
19. SCREW
18. SHUTOFF VLAVE
747-400
MAINTENANCE MANUAL

7. WASHER
6.SCREW
9.
 O-RING

10.
 GASKET PLATE

11.
 RETAINER

12.
 PRESSURE SWITCH

13.
 O-RING

14.
 O-RING

15.
 O-RING

16.
 ELECTRIC MOTOR

17.
 IDENTIFICATION PLATE

B
Stabilizer Trim Control Module and Components Installation
Figure 201 (Sheet 2)

8. SOLENOID VALVE ASSEMBLY
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (2)  
Access Panel 312A Horizontal Stabilizer Jackscrew Access Door

 C.
Procedure

 S 862-030
 (1)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P7, Overhead Circuit Breaker Panel
 1) 7C10, FLT CONT ELEC 2L AC
 2) 7C11, FLT CONT ELEC 2L DC
 3) 7C12, FLT CONT ELEC 1L AC
 4) 7C13, FLT CONT ELEC 1L DC
 5) 7C14, FLT CONT ELEC 1R AC
 6) 7C15, FLT CONT ELEC 1R DC
 7) 7C16, FLT CONT ELEC 2R AC
 8) 7C17, FLT CONT ELEC 2R DC
 9) 7E6, STAB TRIM L CONT
 10) 7E7, STAB TRIM L S/O VLV
 11) 7E8, STAB TRIM L RATE
 12) 7E19, STAB TRIM R CONT
 13) 7E20, STAB TRIM R S/O VLV
 14) 7E21, STAB TRIM R RATE
 15) 7E23, STAB TRIM ALTN CONT

 S 012-031
 (2)  
Open the access Door 312A (AMM 06-09-05/201).

 S 032-141

 (3)  
Disconnect the electrical connector DB188B or DB189B from the pressure switch (12).

 S 022-032

 (4)  
Remove the pressure switch (12):

 (a)  
Remove the pressure switch (12) from the STCM (1).

 (b)  
Remove the O-ring (13) and two retainers (11) from the pressure switch (12)

 (c)  
Discard the O-ring (13) and the retainers (11).

 TASK 27-41-04-402-033
 6.  Pressure Switch Installation____________________________
 A. Consumable Materials
 (1)  D00054 Lubricant - Skydrol Assembly Lube MCS352
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