Garmin GNS 530AW Installation Manual - page 109

500W Series Installation Manual  

Page 5-31 

190-00357-02  

Rev. D 

5.5.4 

VHF NAV Checkout (GNS 530W) 

Press the CDI key to select VLOC mode (indicated by a white VLOC in the lower left corner of the 

display). Check the VOR reception with ground equipment, operating VOT or VOR, and verify audio 

and Morse code ID functions (if possible). Tune a Localizer frequency and verify the CDI needle and 

NAV flag, and VDI needle and GS flag operation.  

5.5.5 

VHF COM Checkout (GNS 530W) 

5.5.5.1 Antenna 

Check 

If desired, the antenna VSWR can be checked using an inline wattmeter in the antenna coax using 

frequencies near both ends of the band. The VSWR should be < 2:1, and is not to exceed 3:1. A VSWR 

of 2:1 will cause a drop in output power of approximately 12%, and 3:1 causes approximately a 26% 

drop.  

5.5.5.2  Receiver / Transmitter Operation 

Tune the unit to a local VHF frequency and verify the receiver output produces a clear and 

understandable audio output. Verify the transmitter functions properly by contacting another station and 

getting a report of reliable communications.  

5.5.6 

TAWS System Check (For Units With TAWS Only) 

While on the ground turn the 500W Series unit on following normal power-up procedures. The audio 

panel should also be turned on. 

NOTE 

A 3D GPS position fix is required to conduct this check. 

1.

Select the TAWS page. 

2.

Press the MENU key. 

3.

Select the Test Terrain? field and press the ENT key. 

4.

Wait until the TAWS self-test completes (10-15 seconds) to hear the TAWS system status aural 

message.   

•

The aural message “TAWS System Test OK” will be annunciated if the TAWS system is 

functioning properly.  

•

The aural message “TAWS System Failure” will be annunciated if the TAWS system is NOT 

functioning properly.  

If no audio message is heard, then a fault exists within the audio system and the TAWS capability must 

be considered non-functional.