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(3) Connect the connector to the rear of the ADF
indicator.
(4) Install the instrument panel cover. Refer to Section 25-10.
(5) Do a test of the ADF system. Refer to Paragraph 5.
AIRCRAFT
DA 40 Series
AMM
Navigation
Doc # 6.02.01
Rev. 5 34-53-00 Page 203
20 Sep 2007
4. Remove/Install the ADF Antenna
A. Remove the ADF Antenna
Detail Steps/Work Items Key Items/References
(1) Remove the passengers' seat. Refer to Section 25-10.
(2) Release the co-axial connector from the antenna.
(3) Release the screws, nuts and washers which
hold the antenna.
Release the bonding cable from the
antenna.
(4) Carefully pull the antenna clear of the fuselage
and hold it.
If necessary, carefully cut the sealant
around the base of the antenna. You
must not damage the fuselage skin.
(5) Move the antenna clear of the airplane.
B. Install the ADF Antenna
Detail Steps/Work Items Key Items/References
(1) Carefully remove any sealant from the area
where the antenna attaches to the fuselage.
(2) Clean the area where the antenna attaches to the
fuselage.
(3) Put the antenna in position under the fuselage.
(4) Attach the antenna with the screws, washers and
nuts.
Attach the bonding cable to one of the
screws.
(5) Connect the co-axial connector to the antenna.
(6) Seal the outer edge of the antenna to the
fuselage skin with sealant.
Use Dow Corning 732 RTV.
(7) Install the passengers' seat. Refer to Section 25-10.
(8) Do a test of the ADF system. Refer to Paragraph 5.
AIRCRAFT
Navigation
DA 40 Series
AMM
Page 204
20 Sep 2007 34-53-00 Doc # 6.02.01
Rev. 5
5. Test the ADF System
Detail Steps/Work Items Key Items/References
(1) Switch the ADF ON:
S Set the master switch ON.
S Set the avionics master switch ON.
S Turn the ADF ON/OFF/VOL knob clockwise.
The ADF display must light. The ADF
indicator must operate.
(2) Make sure that the ADF receiver is tuned to a
useable ADF frequency.
(3) Push the ADF push button to select ANT mode. The pointer on the ADF indicator must
move to the parked position (90º).
(4) Push the ADF push button to select ADF mode. The pointer on the ADF indicator must
move to the station bearing without
hesitation.
(5) Switch the ADF OFF:
S Turn the ADF ON/OFF/VOL knob counterclockwise.
S Set the avionics master switch OFF.
S Set the master switch OFF.
AIRCRAFT
DA 40 Series
AMM
Navigation
Doc # 6.02.01
Rev. 5 34-54-00 Page 1
20 Sep 2007
Section 34-54
Distance Measuring Equipment (DME)
1. General
This Section tells you about the distance measuring equipment (DME) 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 DME system consists of the following items:
) DME receiver.
) Remote DME switch.
) DME antenna.
The audio panel controls the audio input from the DME (refer to Section 23-50).
2. Description and Operation
The DME gives the following information:
) Distance to DME ground stations.
) Ground speed.
) Time-to-station.
) Ground station identification by means of audio reception.
The DME measures the time required for signals to travel from the airplane to the ground station and
back to the airplane. The distance to the ground station is calculated from that time.
This distance, known as 'slant range distance', should not be confused with actual along-the-ground
distance. The difference between actual ground distance and slant range is least at low altitude and/or
long range. If the range is three times the altitude or greater, error is negligible.
The system determines the ground speed by measuring the rate of change in slant range distance with
time.
To obtain accurate ground speed, the airplane must be tracking directly to or from the station. To
obtain accurate time to station, the airplane must be tracking directly to the station.
AIRCRAFT
Navigation
DA 40 Series
AMM
Page 2
20 Sep 2007 34-54-00 Doc # 6.02.01
Rev. 5
Distance to Station
Photocell
provides
Automatic
Display
Dimming
ON/OFF Switch Frequency Selector
Knobs
Station Frequency, RMT/FREQ/GS/T function
switch
92.4 112.30 RMT
OFF
FRQ GS/T
BENDIX/KING
KN 62 A
DME
DME Channel
NAV 1/NAV 2
Switch
DME CH
NAV1
NAV2
Figure 1: Bendix/King KN 62A DME Receiver
Figure 2: Remote DME Switch
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