A
737-300/400/500MAINTENANCE MANUAL
 TASK 27-41-98-424-002
 3.  R850 Horizontal Stabilizer Interlock Relay Installation (Fig. 401)_______________________________________________________
 A. References
 (1)  
AMM 27-41-98/501, "R850 Horizontal Stabilizer Interlock Relay Test"

 (2)  
AMM 25-21-45/401, "Sculptured Ceiling Panel Installation"

 B.
Access

 (1)  
Location Zones

 (a)  
Body Station 867 to Body Station 887

 C.
R850 Interlock Relay Installation

 S 424-013
 (1)  
Install the relay on the bracket and connect the connector to the wiring loom.

 S 424-014

 (2)  
Install the two screws that attach the relay bracket to the relay.

 S 424-015

 (3)
Connect the electrical connector to the R850 relay assembly.

 S 414-016

 (4)  
Install the overhead panels in the main cabin between STA 867 and STA 887.

 D.
Restore the Airplane to its Usual Condition

 S 864-011
 (1)
Remove the DO-NOT-CLOSE tag and close this circuit breaker:

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

 S 764-012
 (2)  Do this task: "R850 Horizontal Stabilizer Interlock Relay Test" (AMM 27-41-98/501).
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 27-41-98
 R850 RELAY  ú
 ú 02 ú BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.  Page 403Nov 12/00 

A
737-300/400/500MAINTENANCE MANUAL
 R850 HORIZONTAL STABILIZER INTERLOCK RELAY - ADJUSTMENT/TEST
____________________________________________________________
 1.  General_______
 A.  This procedure has this task:
 (1)
A test of the R850 Horizontal Stabilizer Interlock Relay.

 B.  
The R850 Horizontal Stabilizer Interlock Relay is referred to as the interlock relay or relay in this procedure.

 TASK 27-41-98-705-001
 2.  R850 Horizontal Stabilizer Interlock Relay Test (Fig. 501)_______________________________________________
 A.  Equipment
 (1)  
Multimeter, 0-40 VAC - Standard

 B.  
References

 (1)  
AMM 24-22-00/201, "Supply Electrical Power"

 (2)  
AMM 24-22-00/201, "Remove Electrical Power"

 (3)  
AMM 25-21-45/401, "Sculptured Ceiling Panel Removal"

 (4)  
AMM 25-21-45/401, "Sculptured Ceiling Panel Installation"

 (5)  
AMM 27-51-00/201, "Extend the Trailing Edge Flaps"

 (6)  
AMM 27-51-00/201, "Retract the Trailing Edge Flaps"

 C.  
Access

 (1)  
Location Zones

 (a)  
701 Tail Compartment

 (b)  
Body Station 867 to Body Station 887

 (2)  
Access Panel
 3701 Stabilizer Trim Access Door

 D.  
Prepare for the Test

 S 015-002
 (1)  
Remove the sculpted ceiling panels at STA 867 and STA 887 on the right-hand side of the passenger cabin, do this task: "Sculptured Ceiling Panel Removal" (AMM 25-21-45/401).

 S 015-003

 (2)
Get access to the R850 relay at the following locations:

 (a)  
STA 867 and STA 887 on the right-hand side of the passenger cabin.

 (3)
Do this task: "Supply Electrical Power" (AMM 24-22-00/201).

 S 865-006

 (4)  
Make sure that the following switches are set to the NORM (or guarded) position:

 (a)  
The STAB TRIM MAIN ELEC (S272) cutout switch.

 (b)  
The Column Actuated Stabilizer Trim Override (S847) switch.

 S 865-005
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