Trouble Possible Cause Repair
NAV flag on both NAV receiver display and VOR/LOC instrument. Faulty NAV receiver. Transmitting station is off the air. Poor co-ax connections. Faulty NAV antenna. Faulty NAV antenna coupler. Repair or replace the NAV receiver. Tune to a new station. Examine co-ax connections for condition and security. Replace the NAV antenna. Replace the NAV antenna coupler.
NAV flag on VOR/LOC instrument only. Faulty VOR/LOC instrument. Faulty wiring. Repair or replace the VOR/LOC instrument. Repair the wiring.
LOC indication not accurate on NAV receiver display. VOR/LOC instrument correct. Faulty NAV receiver. Repair or replace the NAV receiver.
LOC indication not accurate on VOR/LOC instrument. NAV receiver display correct. LOC centering adjustment needed. Faulty VOR/LOC instrument. Adjust LOC centering. Refer to manufacturer's documentation. Repair or replace the VOR/LOC instrument.
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DA 40 Series
Trouble Possible Cause Repair
VOR indication not accurate on NAV receiver display. VOR/LOC instrument correct. Faulty NAV receiver. Repair or replace the NAV receiver.
VOR indication not accurate on VOR centering adjustment Adjust VOR centering. Refer to
VOR/LOC instrument. NAV needed. manufacturer's documentation.
receiver display correct. Faulty VOR/LOC instrument. Repair or replace the VOR/LOC instrument.
GS indication not accurate on GS centering adjustment Adjust GS centering. Refer to
GS instrument. needed. Faulty NAV/GS receiver. Faulty GS instrument. Poor co-ax connections. Faulty NAV antenna. Faulty NAV antenna coupler. manufacturer's documentation. Repair or replace the NAV/GS receiver. Repair or replace the GS instrument. Examine co-ax connections for condition and security. Replace the NAV antenna. Replace the NAV antenna coupler.
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Navigation
AMM
Maintenance Practices
1. General
This Section tells you how to remove/install components of the VOR/LOC/GS system.
Refer to Section 23-10 for maintenance practices for the NAV/COM receivers and antennas. Refer to Section 34-28 for maintenance practices for the HSI.
2. Remove/Install the CDI
A. Remove the CDI
Detail Steps/Work Items Key Items/References
(1) Remove the instrument panel cover. Refer to Section 25-10.
(2) Dis-connect the connector from the rear of the CDI.
(3) Remove the screws which attach the CDI to the panel. Hold the CDI!
(4) Remove the CDI from the panel.
B. Install the CDI
Detail Steps/Work Items Key Items/References
(1) Put the CDI in position in the panel.
(2) Install the screws which attach the CDI to the panel.
(3) Connect the connector to the rear of the CDI.
(4) Install the instrument panel cover. Refer to Section 25-10.
(5) Do a NAV/COM test. Refer to Section 23-10.
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Navigation
AMM
Section 34-53
Automatic Direction Finder (ADF)
1. General
This Section tells you about the automatic direction finder (ADF) system that can be installed in the DA 40. Refer to the manufacturer's manuals for more data about the equipment. Refer to Chapter 92 for the wiring diagrams.
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