Cirrus SR2x

AUDIO PANEL AND CNS
SYSTEM
OVERVIEW
FLIGHT
INSTRUMENTS
EIS
AUDIO PANEL
& CNS
4.7 ABNORMAL OPERATION
Abnormal operation includes equipment failures of the avionics components and failure of associated equipment,
including switches and external devices.
AUDIO PANEL FAIL-SAFE OPERATION
If there is a failure of the Audio Panel, a fail-safe circuit connects the pilot’s headset and microphone directly
to the COM1 transceiver. Audio is not available on the speaker during fail-safe operation.
STUCK MICROPHONE
If the push-to-talk (PTT) Key becomes stuck, the COM transmitter stops transmitting after 35 seconds of
continuous operation. An alert appears on the PFD to advise the crew of a stuck microphone.
The MIC Key Annunciator on the Audio Panel flashes as long as the PTT Key remains stuck.
FLIGHT
MANAGEMENT
HAZARD
AVOIDANCE
COM TUNING FAILURE
Figure 4-59 Stuck Microphone Alert
In case of a COM system tuning failure, the emergency frequency (121.500 MHz) is automatically tuned in
the radio in which the tuning failure occurred. Depending on the failure mode, a red X may appear on the
frequency display.
Emergency Channel
Loaded Automatically
INDEX
APPENDICES
ADDITIONAL
FEATURES
AFCS
Figure 4-60 COM Tuning Failure
160
Pilot’s Guide for the Cirrus SR2x with Cirrus Perspective by Garmin
190-00820-11 Rev. A