400W Series Installation Manual Page 5-25190-00356-02 Rev. G5.4 Ground Checks (Configuration Mode)5.4.1 Main Indicator (Analog Only)NOTEIf the GNS 400W Series unit is interfaced to an electronic HSI and the main indicatoranalog output is not used, this check is not required.If the GNS 400W Series unit is interfaced to an analog indicator on the main CDI/OBS, perform thefollowing steps:1. Go to the MAIN CDI / OBS CONFIG page.2. Verify correct operation of the lateral deviation, flag and TO/FROM flag using the correspondingselections.3. Verify correct operation of the vertical deviation and flag using the corresponding selections.4. Verify correct operation of the OBS knob using the SELECTED COURSE display. At 30°increments around the OBS card, ensure that the indicated value is within 2° of the value set onthe indicator.5.4.2 VOR/ILS Indicator (GNS 430W Only)If the GNS 430W unit is interfaced to an analog indicator on the VOR/ILS Indicator output, perform thefollowing steps:1. Go to the VOR / LOC / GS CDI configuration page.2. Verify correct operation of the lateral deviation, flag and TO/FROM flag using the correspondingselections.3. Verify correct operation of the vertical deviation and flag using the corresponding selections.5.4.3 Discrete Inputs and Annunciator Outputs CheckoutIf the GNS 400W Series unit is connected to external annunciators/systems or external switches, performthe following steps:1. Go to the MAIN DISCRETE INPUTS page.2. For each external switch that is connected, exercise the switch and use the EXTERNAL SWITCHSTATE section to verify that the input is functioning correctly.3. Go to the MAIN DISCRETE OUTPUTS page.4. For each annunciator output that is connected to an external system or annunciator, toggle theoutput ON (corresponding box is filled/green) and OFF (corresponding box is not filled/blue)using the DISCRETE TOGGLE field. Verify that the appropriate external annunciatorilluminates when the output is set to ON and extinguishes when the output is set to OFF. If theoutput is not connected to an annunciator but provides an input to another system, verify that theother system receives the signal.
