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knob CW (clockwise) activates the unit. CW rotation of knob beyond
the ‘on’ detent increases pilot ICS (intercom system) volume.
ATA /
Item
Description Sym Qty Part Number
Unit
Wt
Arm
22-01 XM Receiver O 1 16665-001 1.7 114.0
Revision 02: 07-18-05
4 of 10 P/N 11934-S01
Section 9 Cirrus Design
Supplements SR20
A fail-safe circuit connects the pilot’s headset directly to the COM1
transceiver in the event of a power failure to the audio control panel or
the panel is switched ‘OFF.’
Test
Pressing the TEST button illuminates all Panel LEDs and the Marker
Beacon Annunciators full bright. During normal operation, a photocell
mounted at the approximate center of the control panel senses
ambient light to allow automatic LED and annunciator intensity
adjustment. Nomenclature dimming is controlled by the INST lights
control on the instrument panel bolster.
Audio/Transceiver Selection
Audio selection is performed through the eight selector push buttons in
the center of the Audio Control Panel. All audio selector push buttons
are push-on, push-off. Selecting an audio source supplies audio to the
headphones or cabin speaker. Selected audio sources are indicated
by illumination of the push-button switch.
Navigation receiver audio source is selected by depressing NAV1,
NAV2 (if installed), MKR, DME (if installed), or ADF (if installed) will
select that radio or device as the audio source. Audio level of
navigation receivers is controlled through the selected radio volume
control.
Transceiver audio is selected by depressing COM1, COM2, or COM3
(if installed). When the audio source is selected using the COM1,
COM2, and COM3 buttons, the audio source will remain active
regardless of which transceiver is selected as the active MIC source.
Both transceiver audio and MIC (microphone) can be selected by
depressing COM1 MIC, COM2 MIC, or COM3 MIC (if installed). Both
pilot and copilot are connected to the selected transceiver and both
have transmit and receive capabilities. Pilot and copilot must use their
respective Push-To-Talk (PTT) switch to transmit. The intercom will
function normally. During transmissions the active transmitter’s COM
MIC button LED blinks at a 1 Hz rate indicating active transmission.
Split COM Function
Pressing the COM 1/2 button activates the split COM function. When
split COM is active, COM 1 is the pilot mic/audio source and COM2 is
Revision 02: 07-18-05
P/N 11934-S01 5 of 10
Cirrus Design Section 9
SR20 Supplements
the copilot mic/audio source. The pilot has receive and transmit
capabilities on COM1 and the copilot has receive and transmit
capabilities on COM2. While split COM is active, simultaneous
transmission from COM1 and COM2 is not possible. The pilot and
copilot can still listen to COM3, NAV1, NAV2, DME, ADF, and MKR.
Pressing the COM 1/2 button a second time will deactivate the split
COM function. While split COM is active, the copilot is able to make PA
announcements over the cabin speaker allowing the pilot to continue
using COM1 independently. This is accomplished by depressing the
PA button while split COM is active. Pressing the PA button a second
time deactivates this feature and returns the system to normal split
COM as described above.
COM Swap Mode
COM swap mode is not available in this installation.
Speaker Output
Pressing the SPKR button will cause the selected airplane radios to be
heard over the cabin speaker. Speaker output is muted when a COM
microphone is keyed. Speaker level is adjustable through an access
hole in the top of the unit (refer to Garmin installation manual or AMM).
Public Address (PA) Function
Pressing the PA button on the audio control panel activates the PA
function. When PA is activated and either the pilot’s or copilot’s
microphone is keyed (PTT pressed), the corresponding mic audio is
output over the cabin speaker. If the SPKR button is also active, any
previously active speaker audio will be muted while the microphone is
keyed. Pilot and copilot PA microphone speaker levels are adjustable
through an access hole in the top of the unit (refer to Garmin
installation manual or AMM).
Personal Music Inputs
• Note •
Serials 1005 thru 1532 and serials before SB 2X-34-14; Audio
from AUDIO INPUT jacks Music1 and Music2 is muted during
intercom activity.
Revision 02: 07-18-05
6 of 10 P/N 11934-S01
Section 9 Cirrus Design
Supplements SR20
The Audio Control Panel has provisions for up to two separate
personal entertainment input (music) devices. These devices are
　
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