B. Parts ~.............................................................................. | AMM | | AIPC | ................. ............................ | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ................................................................................ | 201 | 11 | Retainer | 27-41-04 | 05 | 85 | | | 12 | Pressure Switch | | | 80 | | | 13 | Packing (O-ring) | | | 90 | 2......…........…...................................…...........….....…........1
 C. 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

 D.
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

 E.
Install the Pressure Switch

 S 422-034
 (1)  
Install the pressure switch (12):

 (a)  
Lubricate the O-ring (13) and the two retainers (11) with assembly lube.

 (b)  
Install the O-ring (13) and the two retainers (11) on the pressure switch (12).

 (c)  
Install the pressure switch (12) on the STCM (1).

 (d)  
Tighten the pressure switch to 300-350 pound-inches (33.9-39.6 newton-meters).

 S 432-142
 (2)  
Connect the electrical connector DB188B or DB189B to the pressure switch (12).

 S 862-035

 (3)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (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 DC
 6) 7C15, FLT CONT ELEC 1R DC
 7) 7C16, FLT CONT ELEC 2R AC
 8) 7C17, FLT CONT ELEC 2R DC

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 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
 F. Do a Test of the Pressure Switch
 S 862-062
 (1)
Do this task: "Supply Electrical Power" (AMM 24-22-00/201).

 S 862-036

 (2)
Do this task: "Supply Hydraulic Power" (AMM 29-11-00/201).

 S 712-037

 (3)  
Do this test of the pressure switch (12):

 (a)  
Operate the STAB TRIM ALTN switches on the control stand until the stabilizer movement is smooth.

 (b)  
Examine the pressure switch (12) for hydraulic leaks.

 S 862-039
 (4)  
If the hydraulic power is not necessary, do this task: "Remove Hydraulic Power" (AMM 29-11-00/201).

 S 862-040

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

 S 412-041

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

 TASK 27-41-04-002-042
 7.  Solenoid Valve Assembly 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

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

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-41-04
 ALL  ú ú 01 Page 211 ú Jun 18/01
　
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