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• Intercom (ICS)
• Marker Beacon
1. Marker Beacon Annunciators
2. Marker Audio Select Button / LED
3. Marker Sensitivity Select Button
a. HI Sensitivity LED
b. LO Sensitivity LED
4. Pilot Intercom Squelch (outer knob)
5. Power / Intercom Volume (inner knob)
6. Transceiver Audio Select Buttons/
LEDs
7. Photocell
8. Receiver Audio Select Buttons / LEDs
9. Transceiver Audio/Transmit Select
Buttons / LEDs
10. Split COM Button / LED
11. Cabin Audio Select Buttons / LEDs
a. SPKR, Cabin Speaker
b. PA, Public Address
12. Intercom Isolation Buttons / LEDs
a. PILOT Intercom Mode
b. CREW Intercom Mode
13. Copilot / Passenger Intercom
Squelch (outer knob)
14. Copilot (IN) / Passenger (OUT)
Intercom Volume (inner knob)
15. Indicator Test Button
5 4 3 9 10 11 12 13 14
1 2 6 7 8 15
SR20_FM09_1108
Audio Control Panel
Revision 02: 07-18-05
P/N 11934-S01 3 of 10
Cirrus Design Section 9
SR20 Supplements
Section 2 - Limitations
Use of auxiliary AUDIO IN entertainment input and the optionally
installed XM Radio System is prohibited during takeoff and landing.
Section 3 - Emergency Procedures
In the event of an audio panel power failure, the audio system will
revert to COM 1 for the pilot’s mic and headphones and the pilot will
have transmit and receive capability.
Section 4 - Normal Procedures
Refer to Section 7 - System Description in this supplement for a
complete description and operation of the Audio Control Panel.
Section 5 - Performance
No change from basic Handbook.
Section 6 - Weight & Balance
Garmin GMA 340 Audio System: No change from basic Handbook.
Installation of the optional XM Radio System adds the following
optional (Sym = O) equipment at the weight and arm shown in the
following table.
Section 7 - System Description
Power On and Fail-safe Operation
The Audio Control Panel is powered ‘OFF’ when the left inner knob
(PILOT) is at the full CCW (counter-clockwise) position. Rotating the
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
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西锐20飞机信息手册 SR22 AIRPLANE INFORMATION MANUAL 1148-126(91)
