(5)  
Make sure all the inertial reference systems are on
 (Ref 34-28-00/201).

 (6)  
Make sure the warning flags do not show on the related flight instruments (Ref 34-28-00/501).

 B.  Set the flight instrument switches as follows:
 (1)  
Set the VHF NAV transfer switch to NORMAL.

 (2)  
Set the COMPASS transfer switch to NORMAL.

 (3)  
Set the ATTITUDE transfer switch to NORMAL.

 (4)  
Set the HSI transfer switches to VOR/ILS.

 C.  Make sure all the systems, flight instrument switching, and flight instruments that supply information to the instrument comparator system function correctly.
 D.  Make sure the two horizontal situation indicators show the same magnetic heading.
 E.  Make sure the two attitude director indicators show the same airplane attitude.
 F.  Make sure the ATT and HDG warning flags are out of view.
 G.  Remove electrical power if it is not necessary (Ref 24-22-00/201).
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A 737-300/400/500MAINTENANCE MANUAL

SYSTEM INPUTS INCORRECT - Go to the troubleshooting
NOT OK

procedure for the applicable system with a failure.
OK

ANNUNCIATOR OPERATION INCORRECT - Examine and replace, if
NOT OK

necessary, the instrument comparator lamps. If the prob-lem continues, replace the comparator monitor unit
(AMM 34-29-11/401). If the problem continues, replace
the instrument comparator annunciators (AMM 34-29-21/
401).

AIRPLANES WITH SB 34-1197;
If the problem continues, replace the comparator relay
in the flight instrument accessory unit (AMM 34-31-61/
401).

OK

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A 737-300/400/500MAINTENANCE MANUAL

ANNUNCIATORS FAIL - Replace the comparator monitor unit
NOT OK

(AMM 34-29-11/401).
OK

ANNUNCIATORS FAIL - Replace the comparator monitor unit

NOT OK

(AMM 34-29-11/401).
OK
THE INSTRUMENT COMPARATOR SYSTEM IS OK.

C44688
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 INSTRUMENT COMPARATOR SYSTEM - ADJUSTMENT/TEST
______________________________________________
 TASK 34-29-00-715-019
 1. Instrument Comparator System - Operational Test
_______________________________________________
 A. General
 (1)  
This procedure is an operational test of the Instrument Compartor System (ICS).

 (2)  
Instrument Comparator System (ICS) compares the output signals from these No. 1 and No. 2 systems: Inertial Reference System, Radio Altimeter, and VOR/ILS Navigation. For each of the systems, the ICS compares the No. 1 and No. 2 output signals. In each system, if the difference between the output signals is more than a specified quantity, an annunciator light will come on.

 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

 C. Access
 (1)  Location Zones
 201/202 Flight Compartment
 205 Electronic Compartment

 D. Prepare for the Operational Test
　
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