TASK 27-41-01-004-001
 2.  Stabilizer Trim/Rudder Ratio Module (SRM) Removal_________________________________________________
 A.  References
 (1) AMM 06-09-01/201, Body Section 41 Access Doors and Panels

Stabilizer Trim/Rudder Ratio Module Installation
Figure 401

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 B.

C.
D.
A
747-400 MAINTENANCE MANUAL
 (2)  
AMM 20-41-02/201, Electrostatic Discharge Sensitive Devices

 (3)  
AMM 24-22-00/201, Manual Control

 (4)
AMM 45-10-00/201, Central Maintenance Computer SystemAccess

 (1)  
Location Zone 117 Electrical and Electronics Compartment, LH 118 Electrical and Electronics Compartment, RH

 (2)  
Access Panel 117A Electronics Compartment Access Door

Procedure to Make a Record of the Shop Faults (Optional)
 S 864-026
 (1)  
Do this task: "Supply Electrical Power" (AMM 24-22-00/201).

 S 974-028

 (2)  
Make a record of the shop faults for the left or the right SRM (AMM 45-10-00/201):

 (a)  
Push the key for OTHER FUNCTION on the CMC menu.

 (b)  
Push the key for SHOP FAULTS on the other functions menu.

 (c)  
Push the key for 27 STABILIZER TRIM on the shop faults menu.

 (d)  
Make a selection of the SRM L or SRM R for the left or the right SRM.

 (e)  
Make a record of the shop faults that are shown.

 S 864-029
 (3)  If the electrical power is not necessary, do this task: "Remove
 Electrical Power" (AMM 24-22-00/201).Remove the SRM
 S 864-003
 (1)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P7, Overhead Circuit Breaker Panel
 1) 7B12, UPR RUD RATIO AC PWR
 2) 7B13, UPR RUD RATIO DC PWR
 3) 7B14, LWR RUD RATIO AC PWR
 4) 7B15, LWR RUD RATIO DC PWR
 5) 7C10, FLT CONT ELEC 2L AC
 6) 7C11, FLT CONT ELEC 2L DC
 7) 7C12, FLT CONT ELEC 1L AC
 8) 7C13, FLT CONT ELEC 1L DC
 9) 7C14, FLT CONT ELEC 1R AC
 10) 7C15, FLT CONT ELEC 1R DC
 11) 7C16, FLT CONT ELEC 2R AC
 12) 7C17, FLT CONT ELEC 2R DC
 13) 7D18, OUTBOARD AILERON LOCKOUT
 14) 7E6, STAB TRIM L CONT
 15) 7E7, STAB TRIM L S/O VLV

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A
747-400 MAINTENANCE MANUAL
 16) 7E8, STAB TRIM L RATE 17) 7E19, STAB TRIM R CONT 18) 7E20, STAB TRIM R S/O VLV 19) 7E21, STAB TRIM R RATE
 S 024-030
 CAUTION: OBEY THE INSTRUCTIONS IN AMM 20-41-02/201 WHEN YOU REMOVE THE
_______ SRM. THE SRM IS ELECTROSTATIC SENSITIVE AND CONTAINS DEVICES THAT CAN BE DAMAGED BY THE ELECTROSTATIC DISCHARGE.
 (2) Remove the SRM from the shelf.
 TASK 27-41-01-404-006
 3.  Stabilizer Trim/Rudder Ratio Module Installation________________________________________________
 A. References
 (1)
AMM 06-09-01/201, Body Section 41 Access Doors and Panels

 (2)
AMM 24-22-00/201, Manual Control

 B.
Access

 (1)  
Location Zone 117 Electrical and Electronics Compartment, LH 118 Electrical and Electronics Compartment, RH

 (2)  
Access Panel
 117A Electrical Compartment Access Door

 C.
Install the SRM

 S 424-031
 CAUTION: OBEY THE INSTRUCTIONS IN AMM 20-41-02/201 WHEN YOU INSTALL THE
_______ SRM. THE SRM IS ELECTROSTATIC SENSITIVE AND CONTAINS DEVICES THAT CAN BE DAMAGED BY THE ELECTROSTATIC DISCHARGE.
 (1) Install the SRM on the shelf.
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