GNS 400W Series Installation Manual Page 5-43190-00356-08 Rev. G5.5.6.15 GTN Crossfill Interface CheckIf 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 anRS-232 wiring problem between the GNS 400W and the GTN 6XX/7XX.5.5.7 Magnetic Compass CheckCompass 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 CheckWhile on the ground turn the 400W Series unit on following normal power-up procedures. The audiopanel should also be turned on.NOTEA 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 statusaural message.The aural message ―HTAWS System Test OK‖ will be annunciated if the HTAWS system isfunctioning properly.The aural message ―HTAWS System Failure‖ will be annunciated if the HTAWS system isNOT functioning properly.If no audio message is heard, then a fault exists within the audio system and the HTAWS capability mustbe considered non-functional.
