Garmin GPS 400W Installation Manual

Also see for GNC 420AW: Maintenance manual Pilot's guide addendum Quick reference guide Pilot's Guide & Reference Pilot's Guide & Reference

Contents

Garmin GPS 400W Installation Manual Manual pdf 109 page image

GNS 400W Series Installation Manual Page 5-31190-00356-08 Rev. G5.4.6 AHRS/IRU Interface CheckThe 400W Series unit can receive heading data from an external source. This check verifies that the400W Series unit is receiving data from these units. Ensure that the 400W Series unit is turned on and inconfiguration mode. If the following steps do not perform correctly, check the electrical connections andconfiguration setup.1. Go to the Main Inputs 1 page.NOTEIf a Sandel EHSI or an ARINC 429 EFIS is also installed, ensure that it is turned off sothat it does not supply heading to the 400W Series unit.2. Verify that the HDG field displays valid heading data.3. Remove power from the heading source and verify that the heading in the HDG field is dashedout.5.4.7 GAD 42 Interface CheckThis check verifies that the 400W Series unit is interfaced with the GAD 42. For the 400W Series units,the GAD 42 CONFIG page is implemented in main software version 2.20 or higher.1. Go to the GAD 42 CONFIG page.2. Verify that STATUS is ACTIVE.3. Change any of the options to a different number.4. Verify that after pressing ENT the STATUS field will change to SENDING then change back toACTIVE. If the entry reverts to the previous number when ACTIVE is displayed, then refer tothe GAD 42 Installation Manual (P/N 190-00159-00).5.4.8 Lighting Bus Interface CheckThe display and key backlighting on the 400W Series unit can track an external lighting/dimmer businput and use it to vary the display and key backlight levels accordingly. This check verifies that theinterface is connected correctly.CAUTIONWhen 14 VDC or 28 VDC lighting buses are connected to the 400W Series unit,connection of the aircraft lighting bus to the incorrect input pins can cause damage to the400W Series unit. Always start this test with the dimming bus at the lowest setting, andslowly increase the brightness. If it is noticed that the LIGHTING level displayed on the400W Series unit does not increase as the lighting is increased in brightness, verify thatthe wiring is correct before proceeding.1. Ensure the lighting bus is set to its minimum setting.2. Go to the Main Lighting page.3. Slowly vary the lighting bus that is connected to the 400W Series unit. Verify that theLIGHTING value displayed on the configuration screen tracks the lighting bus setting. Continueto maximum brightness and verify proper operation.