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 S 872-128
 (3)  Decrease the remaining pressure in the hydraulic system to zero: (a) Operate the STAB TRIM ALTN switches to APL NOSE UP and APL NOSE DN three times.
 (b)  Attach the DO-NOT-MOVE tags to the STAB TRIM ALTN switches on the control stand.
 S 862-007
 (4)  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 862-008
 (5)  If the electrical power is not necessary, do this task: Electrical Power" (AMM 24-22-00/201). "Remove
 S 012-009
 (6)  Open the access door 312A (AMM 06-09-05/201).
 S 032-058
 (7)  FOR THE LEFT STCM (1); Disconnect electrical connectors DB189A, DB189B, DB189C, DB189D and DB189E.

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A
747-400
MAINTENANCE MANUAL

 S 032-122
 (8)  
FOR THE RIGHT STCM (1); Disconnect electrical connectors DB188A, DB188B, DB188C, DB188D and DB188E.

 S 032-059

 (9)  
Disconnect the hydraulic lines.

 (a)  
Seal all the hydraulic lines with plugs and seal the ports with caps.

 S 022-060
 (10)
 Remove the STCM (1):

 (a)  
Hold the STCM (1).

 (b)  
Remove the bolts (3) that attach the STCM with the mounting bracket (2).

 (c)  
Remove the STCM (1).

 TASK 27-41-04-402-011
 3. Stabilizer Trim Control Module Installation
___________________________________________
 A. Standard Tools and Equipment
 (1)  
Bonding Meter

 B.
Consumable Materials

 (1)  
A00247 Sealant - BMS 5-95

 (2)  
D00054 Lubricant - Skydrol Assembly Lube MCS352

 C. Parts ~.............................................................................. | AMM | | AIPC | ................. ............................ | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ................................................................................ | 201 | 1 | Module | 27-41-04 | 03 | 150 | | | 3 | Bolt | | | 155 | | | 4 | Washer | | | 160 | | | 5 | Nut | | | 165 | 2......…........…...................................…...........….....…........1
 D. References
 (1)  
AMM 06-09-05/201, Body Section 48 Access Doors and Panels

 (2)  
AMM 24-22-00/201, Manual Control

 E.
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

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A
747-400 MAINTENANCE MANUAL
 F. Procedure
 S 422-012
 (1)  
Install the STCM (1):

 (a)  
Clean the mating surfaces.

 (b)  
Set the STCM (1) on the mounting bracket (2).

 (c)  
Install the bolts (3), the washers (4), and the nuts (5). 1) Tighten the nut (5).

 (d)  
Use a bonding meter to make sure that the resistance from the STCM to the bracket is not more than 0.0025 ohms.

 (e)  
Apply a bead of sealant to all the joints and the two sides of the fastener.

 (f)  
Remove the lugs and caps.

 (g)  
Apply assembly lube to all hydraulic fittings before the installation of the STCM.
　
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