Magnetic Compass Check; Htaws System Check - Garmin GPS 400W Installation Manual

5.5.6.15 GTN Crossfill Interface Check
If a GTN is connected to the GNS 400W over RS-232, the interface should be verified as follows:
1. Turn on both the GTN 6XX/7XX and the GNS 400W.
2. Select the first AUX page (titled ‗FLIGHT PLANNING').
3. Select ‗CROSSFILL'.
4. Verify that the displayed status is ‗Ready'. If ‗Not Available' is displayed, there may be an
RS-232 wiring problem between the GNS 400W and the GTN 6XX/7XX.
5.5.7

Magnetic Compass Check

Compass swing should be carried out at completion of installation in accordance with AC 43.13-1B,
chapter 12, section 3, paragraph 12-37.
5.5.8

HTAWS System Check

While on the ground turn the 400W Series unit on following normal power-up procedures. The audio
panel should also be turned on.
A 3D GPS position fix is required to conduct this check.
1. Select the HTAWS page.
2. Press the MENU key.
3. Select the Test HTAWS? field and press the ENT key.
4. Wait until the HTAWS self-test completes (10-15 seconds) to hear the HTAWS system status
aural message.
The aural message ―HTAWS System Test OK‖ will be annunciated if the HTAWS system is
functioning properly.
The aural message ―HTAWS System Failure‖ will be annunciated if the HTAWS system is
NOT functioning properly.
If no audio message is heard, then a fault exists within the audio system and the HTAWS capability must
be considered non-functional.
GNS 400W Series Installation Manual
190-00356-08
NOTE
Page 5-43
Rev. G