S 865-004

 (2)  
Before doing the instrument comparator system test, make sure that these systems are serviceable:

 (a)  
Autopilot (AMM 22-11-00/501)

 (b)  
VOR/ILS Navigation (AMM 34-31-00/501).

 (c)  
Radio Altimeter (AMM 34-48-00/501).

 (d)  
Inertial Reference Systems (AMM 34-28-00/201).

 S 865-005
 (3)  
Make sure that all ADI, HSI, and flight instrument switching circuit breakers are closed.

 S 865-006

 (4)  
Set the flight instrument switches as follows:

 (a)
VHF NAV transfer switch to the NORMAL position.

 (b)
COMPASS transfer switch to the NORMAL position.

 (c)
ATTITUDE transfer switch to the NORMAL position.

 (d)
HSI transfer switches to the VOR/ILS position.

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737-300/400/500MAINTENANCE MANUAL
 E. Instrument Comparator System Operational Test
 S 865-008
 (1)  
Make sure that the COMPARATOR-PWR and COMPARATOR-MON circuit breakers on the P6 circuit breaker panel are closed.

 S 865-009

 (2)  
Open the COMPARATOR-PWR circuit breaker.

 (a)  Make sure the MON PWR lights on the captain's and the first officer's instrument comparator panels come on.
 S 865-010
 (3)  Push the captain's MON PWR annunciator.
 (a)  Make sure the MON PWR light dims.
 S 865-002
 (4)  Push the first officer's MON PWR annunciator.
 (a)  Make sure the MON PWR light dims.
 S 865-012
 (5)  Close the COMPARATOR-PWR circuit breaker.
 (a)  Make sure the MON PWR lights go off.
 S 745-046
 (6) Push the INSTR COMP test switch on the captain's instrument panel.
 (a)  
Make sure all six amber lights come on.

 (b)  
AIRPLANES WITH A COLLINS -002 COMPARATOR MONITOR UNIT; Make sure the red MON PWR light comes on.

 S 745-045
 (7)  
Push and hold the INSTR COMP test switch on the captain's instrument panel.

 S 865-033

 (8)  
Push the captain's instrument comparator annunciator panel.

 (a)  Make sure that the annunciator lights become dim.

 (9)  
Release the instrument comparator annunciator panel.

 S 865-035

 (10)
 Push the first officer's instrument comparator annunciator panel.

 (a)  Make sure that the annunciator lights become dim.

 (11)
 Release the instrument comparator annunciator panel.

 S 865-037

 (12)
 Release the INSTR COMP test switch on the captain's instrument panel.

 S 865-034
 S 865-036
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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737-300/400/500MAINTENANCE MANUAL
 S 865-017
 (13) Remove electrical power if it is not necessary (AMM 24-22-00/201).
 TASK 34-29-00-735-018
 2. Instrument Comparator System - System Test
__________________________________________
 A. Equipment and Materials
 (1)  
Ramp and Bench Test Set - Collins type 972Q-4 or Instrument Flight Research type NAV 401L

 (2)  
Radio Altimeter Test Set (simulator)

 B. References
 (1)  
AMM 22-11-00/501, Autopilot

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

 (3)  
AMM 34-28-00/201, Inertial Reference System

 (4)  
AMM 34-31-00/501, VOR/ILS Navigation

 (5)  
AMM 34-48-00/501, Radio Altimeter