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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

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P/N 11934-S01

Revision 1: 07-18-05