These indications occur after approximately 23 seconds:
1.  
The GS flag and the RUNWAY flag on the captain's ADI come into view

2.  
The navigation warning flag and the VERT flag on the captain's HSI come into view.

Release the DN/RT test switch. IF -

E

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F
THE ILS SOUND IS NOT HEARD - Replace
THE ILS SOUND IS WEAK FOR THE TWO the applicable navigation unit. Do the
SYSTEMS - Do a troubleshooting on the test again. If the problem continues,
ILS antenna circuits. (Refer to do a troubleshooting on the flight
PROCEDURE 2.) interphone system.
THE ILS SOUND IS OK - Set a frequency of 108.10 Mhz on the VHF NAV control panels. Set up a ramp test set to supply an on-course glide slope signal of 334.7 Mhz. Make sure the glide slope pointers show on the EHSIs. IF -
THE GLIDE SLOPE POINTERS DO NOT SHOW -THE GLIDE SLOPE POINTERS SHOW - The Examine the coaxial cables at the glide system is OK. slope antenna and at the navigation units for corrosion and/or loose connec-tors. If necessary, repair or replace the coaxial connectors. Do the test again. If the problem continues, replace the applicable navigation unit. Do the test again.
A52454
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A 737-300/400/500MAINTENANCE MANUAL
PROCEDURE 1

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PROCEDURE 2

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A
737-300/400/500MAINTENANCE MANUAL
 VOR/ILS NAVIGATION SYSTEM - ADJUSTMENT/TEST
___________________________________________
 1.  General_______
 A.  This subject has two tasks. The first task is an operational test of the VOR/ILS navigation system. The second task is a system test of the VOR/ILS navigation system.
 TASK 34-31-00-715-001
 2.  Operational Test - VOR/ILS Navigation System____________________________________________
 A.  General
 (1)  
The operational test does not use external test equipment. The task uses the local VOR station and the built-in test equipment (BITE) of the VOR/ILS navigation system.

 (2)  
This task contains these procedures:

 (a)  
Prepare for the Operational Test

 (b)  
Self-Test for System No. 1

 (c)  
Self-Test for System No. 2

 (d)  
VOR Flag Test

 (e)  
VHF NAV Transfer Switch Test

 (f)  
Heading Input Test.

 B.  References
 (1)  
　
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航空翻譯 www.aviation.cn
本文鏈接地址：737-300 400 500 AMM 飛機維護手冊 導航 NAVIGATION 2(137)