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pilots and the passengers.
) Cabin speaker. The cabin speaker is located in the roof of the cockpit.
AIRCRAFT
DA 40 Series
AMM
Communications
Doc # 6.02.01
Rev. 5 23-10-00 Page 1
20 Sep 2007
Section 23-10
Speech Communication
1. General
This Section tells you about the speech communication system in the DA 40. It does not tell you about
the speech communication equipment. Refer to the equipment manufacturers' manuals for more data
about the equipment.
This Section also tells you about the NAV function of the NAV/COM receivers. Refer to Section 34-52
for more information about the VOR/LOC/GS system. Refer to Section 23-50 for information about the
audio system. Refer to Section 34-58 for more information about the GPS system of the
NAV/COM/GPS units.
The NAV/COM system can have the following components:
) NAV/COM 1 (Bendix/King KX 125, KX 155A, KX 165A; Garmin GNS 430, GNS 530).
) NAV/COM 2 (Bendix/King KX 155A; Garmin GNS 430).
) COM 1 antenna.
) COM 2 antenna.
) NAV (VOR/LOC/GS) antenna.
) NAV antenna coupler (Comant CI 505, CI 1125).
) Ground COM #2 switch.
Figure 1 shows the antenna locations.
AIRCRAFT
Communications DA 40 Series
AMM
Page 2
20 Sep 2007 23-10-00 Doc # 6.02.01
Rev. 5
COMM 1
COMM 1
COMM 2
Transponder/DME
Transponder
GPS
Marker
Marker
ADF
GPS
DME
VHF- NAV
VHF- NAV
SBY
SBY
COMM
OFF
PULL
TEST
PULL
IDENT
PULL
25K
MODE
PULL
OB S
KX 125 TSO
NAV
118.00 0 108.00
136.97 OBS 0 15 FLAG 117.95
T
X
TO
FR
Active COMM
Frequency Display
Standby COMM
Frequency Display
COMM Frequency
Transfer Button
Transmit
Indicator
OBS Annunciator
Course
Deviation
Indicator
COMM Volume
Pull Test Knob
COMM Frequency
Selector Knob
NAV Mode Button
NAV Volume
Pull Ident Knob
NAV Frequency
Selection Knob
OBS Setting
Display
To/From
Annunciator
NAV Flag
Active NAV
Frequency Display
Standby NAV
Frequency Display
NAV Frequency
Transfer Button
Figure 1: Antenna Locations
Figure 2: Bendix/King KX 125 NAV/COM
AIRCRAFT
DA 40 Series
AMM
Communications
Doc # 6.02.01
Rev. 5 23-10-00 Page 3
20 Sep 2007
2. Description
A. KX 125 NAV/COM
Figure 2 shows the KX 125 NAV/COM. It is located in the avionics rack in the instrument panel, see
Chapter 31.
The KX 125 is a communications transceiver and navigation receiver. The equipment can receive
COM signals from 118 MHz to 136.975 MHz in 25 kHz increments. This gives 760 communication
channel operation. The equipment can receive NAV signals from 108 MHz to 117.95 MHz in 50 kHz
increments. This gives 200 navigation channel operation.
The left side display shows the COM frequency data. The top line shows the active COM and the
bottom line shows the standby COM frequency. When the equipment transmits a TX annunciator
comes on next to the active COM frequency.
The right side display shows the NAV frequency data. The top line shows the active NAV frequency
and the bottom line shows the standby NAV frequency.
The center display shows this navigation information:
) CDI Mode. The Course Deviation Indicator (CDI) is the top half of the center display. When the
KX 125 receives valid navigation information and CDI mode is selected the CDI will operate. In
CDI mode, a line of dots either side of a center “0" makes the course deviation indicator. Vertical
bars appear to one side of the center “0" to tell the pilot how far the airplane is deviating from
the selected course. Each dot shows 2° of deviation.
In normal CDI operation the “OBS” annunciator appears under the CDI with the selected Omni-
Bearing-Selector (OBS) bearing. A TO/FR annunciator tells the pilot if the bearing is to, or from,
the selected station. The “FLAG” indicator shows in the bottom right of the display when no valid
signals are being received in CDI mode.
) BEARING (BRG) Mode. When bearing mode is selected and a valid signal is being received a
three-digit bearing and the “TO” annunciator show in the bottom half of the center display. A row
of dashes show when the receiver is not receiving a valid signal.
) RADIAL (RAD) Mode. When radial mode is selected and a valid signal is being received a
three-digit radial and the “FR” annunciator show in the bottom half of the center display. A row
　
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