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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 (7)  S 715-009Use the insulaton tester to examine all wires and switch that have a resistance of 2 megohms or larger.
 (8)  S 865-010Move the stabilizer trim cutout switch S272 to NORMAL.
 (9)  S 425-015Install the digital flight data acquisition unit (DFDAU) (AMM 31-24-22/401).
 S 435-011

 (10)
 Connect the electrical connector D3124 to the column actuated cutout switch M1201.

 S 865-004

 (11)
 Do this task: "Supply Electrical Power" (AMM 24-22-00/201).

 S 865-003

 (12)
 Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  
P6-2 Circuit Breaker Panel 1) STABILIZER TRIM ACTUATOR 2) STABILIZER TRIM CONT

 S 715-005
 (13)
 Move the stabilizer trim control switch to NOSE UP and then to NOSE DOWN.

 (a)  
Make sure the stabilizer operates correctly.

 S 865-006
 (14) If the electrical power is not necessary, do this task:  "Remove Electrical Power" (AMM 24-22-00/201).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 HORIZONTAL STABILIZER INTERLOCK RELAY - REMOVAL/INSTALLATION
____________________________________________________________
 1.  General_______
 A.  This procedure has these tasks:
 (1)  
A removal of the horizontal stabilizer interlock relay.

 (2)  
An installation of the horizontal stabilizer interlock relay.

 B.  
The horizontal stabilizer interlock relay is referred to as the R850 relay or relay in this procedure.

 TASK 27-41-98-024-005
 2.  Horizontal Stabilizer Interlock Relay Removal (Fig. 401)_____________________________________________
 A.  Reference
 (1)  
AMM 25-21-45/401 "Sculptured Ceiling Panel Removal"

 B.  
Access

 (1)  
Location Zones

 (a)  
Body Station 867 to Body Station 887

 C.  
Prepare for the Removal

 S 864-006
 (1)
Open this circuit breaker and install a DO-NOT-CLOSE tag:

 (a)  
Circuit Breaker Panel, P6-2
 1) STAB TRIM CONT

 D.  
R850 Relay Assembly Removal

 S 014-007
 (1)  
Remove the overhead panels in the main cabin between STA 867 and STA 887, do this task: AMM 25-21-45/401 "Sculptured Ceiling Panel Removal".

 (2)
Remove the electrical connector from the R850 relay assembly.

 (3)  
Remove the two screws that attach the relay bracket to the relay.

 S 024-010

 (4)  
Remove the relay from the bracket and disconnect the connector from the wiring loom.

 S 024-008
 S 024-009
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 R850 RELAY  ú
 ú 02 ú BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.  Page 401Nov 12/00 

A

737-300/400/500MAINTENANCE MANUAL
SEE A
110V AC 
STA  INTERLOCK 
887  RELAY 
(R850) 
STA 
867 

INBD 
FWD
A(2 LOCATIONS) WASHER ASSEMBLY INSULATION BLANKET (TYPICAL) 110V AC R850 RELAY LOCATION CLAMP, WASHER, SCREW, 
R850 Relay Removal Figure 401 

L38105
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