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and the standby frequency to active when in VOR mode. When in timer mode you push this
button to set or reset the timer.
AIRCRAFT
DA 40 Series
AMM
Communications
Doc # 6.02.01
Rev. 5 23-10-00 Page 9
20 Sep 2007
) PULL OBS switch. The PULL OBS switch is the inner FREQUENCY SELECT knob. If you pull
this knob out you can use the inner FREQUENCY SELECT knob to select the OBS course.
When this knob is pulled the OBS indicator in the top center of the NAV display flashes.
) PULL IDENT knob. Pull the PULL IDENT knob to hear the usual voice communications on the
audio system and to hear the station IDENT tone on the audio system. Push the knob to hear
the usual voice communications on the audio system but not hear the IDENT tone. Turn this
knob to adjust the volume of the voice communications or IDENT tone.
AIRCRAFT
Communications DA 40 Series
AMM
Page 10
20 Sep 2007 23-10-00 Doc # 6.02.01
Rev. 5
Figure 4: Garmin GNS 430 NAV/COM/GPS
Figure 5: Garmin GNS 530 NAV/COM/GPS
AIRCRAFT
DA 40 Series
AMM
Communications
Doc # 6.02.01
Rev. 5 23-10-00 Page 11
20 Sep 2007
C. GNS 430/530 NAV/COM
Figure 4 shows the GNS 430 NAV/COM/GPS system. Figure 5 shows the GNS 530
NAV/COM/GPS system. They are located in the avionics rack in the instrument panel, see Chapter
31.
The GNS 430/530 has these functions:
) Two-way voice communication in the frequency range from 118 MHz to 136.975 MHz in 25 kHz
or 8.33 kHz increments (depends on setup). This gives 760 or 2278 communication channel
operation.
) Receiving navigation signals in the frequency range from 108 MHz to 117.95 MHz in 50 kHz
increments. This gives 200 navigation channel operation.
) Receiving glideslope signals in the frequency range from 329.15 MHz to 335 MHz in 150 kHz
increments.
The GNS 430/530 has the communication and navigation controls on the left. They have these
controls:
) The small left knob (PUSH C/V) (1) is used to tune the kilohertz (kHz) value of the standby
frequency for the communications transceiver (COM) or the VLOC receiver, whichever is
currently selected by the tuning cursor. Press this knob momentarily to toggle the tuning cursor
between the COM and VLOC frequency fields.
) The large left knob (COM/VLOC) (2) is used to tune the megahertz (MHz) value of the standby
frequency for the communications transceiver (COM) or the VLOC receiver, whichever is
currently selected by the tuning cursor.
) The VLOC volume knob (3) controls audio volume for the selected VOR/Localizer frequency.
Press momentarily to enable/disable the ident tone.
) The VLOC flip-flop key (4) is used to swap the active and standby VLOC frequencies (i.e., make
the selected standby frequency active).
) The COM power/volume knob (5) controls unit power and communications radio volume. Press
momentarily to disable automatic squelch control.
) The COM flip-flop key (6) is used to swap the active and standby COM frequencies. Press and
hold to select emergency channel (121.500 MHz).
The GNS 430/530 display is divided into separate 'windows' (or screen areas), including a COM
window, VLOC window and the GPS window (the right 3/4 of the display).
AIRCRAFT
Communications DA 40 Series
AMM
Page 12
20 Sep 2007 23-10-00 Doc # 6.02.01
Rev. 5
D. COM 1 Antenna
The COM 1 antenna (Comant DM C63-1/A) is mounted on the upper surface of the fuselage, aft
of the cockpit.
E. COM 2 Antenna
The COM 2 antenna (Comant DM C63-2) is mounted on the lower surface of the fuselage, aft of
the cockpit.
F. NAV Antenna
The NAV (VOR/LOC/GS) antenna (Comant CI 157P) is integrated in the horizontal stabilizer.
G. NAV Antenna Coupler
The NAV antenna coupler (Comant CI 505 or CI 1125) is located on the instrument panel floor on
a connector mounting behind the avionics rack. It divides the signal which comes from the NAV
antenna into individual signals for the NAV 1 receiver, the NAV 2 receiver, and the glideslope
receiver.
H. Ground COM #2 switch
The ground COM #2 switch is located on the instrument panel directly left of the annunciator panel,
see Chapter 31.
The ground COM #2 switch is a toggle type switch. When it is set to ON, then the COM #2
transceiver can be used on the ground without switching the master switch ON. Refer to Chapter
92 for wiring diagrams.
AIRCRAFT
DA 40 Series
AMM
Communications
Doc # 6.02.01
Rev. 5 23-10-00 Page 101
20 Sep 2007
Trouble-Shooting
1. General
The table below lists the defects you could have with the speech communication system. Refer to
Section 34-52 for trouble-shooting the VOR/LOC/GS system. Refer to Section 34-58 for troubleshooting
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