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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.
AIRCRAFT
Navigation
DA 40 Series
AMM
Trouble Possible Cause Repair
Page 102
20 Sep 2007 34-52-00 Doc # 6.02.01
Rev. 5
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/LOC instrument. NAV
receiver display correct.
VOR centering adjustment
needed.
Faulty VOR/LOC instrument.
Adjust VOR centering. Refer to
manufacturer's documentation.
Repair or replace the
VOR/LOC instrument.
GS indication not accurate on
GS instrument.
GS centering adjustment
needed.
Faulty NAV/GS receiver.
Faulty GS instrument.
Poor co-ax connections.
Faulty NAV antenna.
Faulty NAV antenna coupler.
Adjust GS centering. Refer to
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.
AIRCRAFT
DA 40 Series
AMM
Navigation
Doc # 6.02.01
Rev. 5 34-52-00 Page 201
20 Sep 2007
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.
AIRCRAFT
Navigation
DA 40 Series
AMM
Page 202
20 Sep 2007 34-52-00 Doc # 6.02.01
Rev. 5
Intentionally left blank
AIRCRAFT
DA 40 Series
AMM
Navigation
Doc # 6.02.01
Rev. 5 34-53-00 Page 1
20 Sep 2007
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.
The ADF system consists of the following items:
) ADF receiver.
) ADF indicator (slaved or non-slaved).
) ADF antenna.
The audio panel controls the audio input from the ADF (refer to Section 23-50).
2. Description and Operation
The ADF gives bearing information, ground station identification, and reception of weather broadcasts
in the AM band.
A. ADF Receiver
Figure 1 shows the Bendix/King KR 87 ADF receiver. It is located in the avionics rack in the
instrument panel, see Chapter 31.
The avionics bus supplies power to the ADF receiver. The ALT/BAT switch (Lycoming version) or
ELECTRIC MASTER key switch (TAE version) and the AVIONIC MASTER switch must be set to
ON to supply power through the ADF circuit-breaker to the ADF receiver. Refer to Chapter 92 for
the wiring diagrams.
The Bendix/King KR 87 is a compact, digitally-tuned, solid-state ADF receiver with built-in
electronics timer. It gives bearing information to stations in the 200 kHz to 1799 kHz frequency
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