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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 C.  Inspection of the Radio and Navigations Systems
 S 212-018
 (1)  Examine the antennas of the systems that follow for damage:
 (a)  
HF

 (b)  
VHF

 (c)  
VOR

 (d)  
DME

 (e)  
ATC

 (f)  
ILS

 (g)  
ADF

 (h)  
Radio Altimeter

 (i)  
Marker Systems

 S 212-019
 (2) Examine the Radar System (Radome) as follows (AMM 53-52-00/601):
 (a)  
Examine the radome; look for pin holes, punctures, and paint that has chipped.

 (b)  
Examine the radome bonding straps; make sure they are attached correctly to the airframe.

 (c)  
Look at the condition of the lightning diverter strips; repair or replace them if they are damaged.

 (d)  
If the radome is damaged, examine the antenna and the waveguide for damage.

 D.  Radio and Navigation System Operational Checks
 S 712-021
 (1)  HF Systems (if installed) (AMM 23-11-00/501).
 (a)  
Do an operational check on some frequencies of each HF system.

 (b)  
Do a ground check of each system with a station that is a minimum of 100 miles away.

 (c)  
Monitor some frequencies on each system to make sure the HF receiver operates.

 S 712-022
 (2)  VHF System (AMM 23-21-01/501).
 (a)  
Do a loading check on some frequencies of each VHF transmitter. Make sure that all transmitter meter indications are correct.

 (b)  
Do a ground check of each VHF system with the local control tower to make sure the system works.

 (c)  
Monitor some frequencies on each system to make sure the VHF receiver works.

 S 712-023
 (3)  VOR System (AMM 34-31-00/501 - NON-EFIS AIRPLANES
 AMM 34-31-02/501 - EFIS AIRPLANES)

 (a) Do a system operational check with a local VOR station.
 1)  If a VOR Test Set is available, do a test of the VOR operation.
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A 737-300/400/500MAINTENANCE MANUAL
 S 712-024
 (4)  
ADF System (AMM 34-57-01/501)

 (a)  
Do an operational check of the receivers on Ant, Loop, and ADF functions.

 (b)  
Select a local AM broadcast or non directional beacon (NDB) station, then verify loud and clear ADF audio is heard and the

 (10)
 ILS System (AMM 34-31-00/501)

 ADF needle points to the selected bearing (station).  a a
 (5)  S 712-025Radar System (AMM 34-41-02/501) (a) Do an operational check of the Radar System to make sure that all of the receiver/transmitter units fault lights are off. (b) Make sure the system reads targets at applicable ranges.
 (6)  S 712-026Radio Altimeter System (AMM 34-48-01/501) (a) Do an operational check of the low range altimeter system.
 (7)  S 712-027DME System (AMM 34-55-02/501) (a) Do an operational check of the system on a local station or a ramp tester.
 (8)  S 712-028ATC System (AMM 34-53-02/501) (a) Do an operational check of the transponder with a ramp tester.
 (9)  S 712-029Marker Beacon System (AMM 34-35-00/501) (a) Do an operational check of the system with a marker test set.
 S 712-030

 (a)  Do an operational check of the system on a local station or with a ramp tester.
 S 212-031
 (11) Examine and do a test of the coaxial cables and connectors if it is required (AMM 20-10-72/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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