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Audio Panel Operation
AUDIO PANEL OPERATION
The audio panel receives audio from remote radio units, decodes the audio, controls the gain (volume) and routing of the various channels, filters audio signals, and output the audio to various speakers and head- phones. It controls microphone inputs to various radios, intercom and passenger address systems. Amplifiers are included for driving head- phones and speakers.
The audio panel also has inputs for intercom, crew annunciator, crew communication, hot microphones and full time emergency warning inputs from aircraft systems.
COM MICROPHONE OPERATION
When a microphone selector button is selected and PTT switch is enabled, the pilot’s or copilot’s microphone signal is routed to that radio’s microphone input. Pressing the MIC selector button to enable a particular COM also causes the audio for that particular COM to be automatically enabled.
Above each microphone input selector button are left and right arrow LEDs that show the status of the respective COM transceiver. The left arrow is lit when that particular COM transceiver is assigned to the pilot. The right arrow is lit when that particular COM transceiver is assigned to the copilot. Only one COM microphone output can be active for the pilot or copilot at a time with two exceptions. The two exceptions are Split Mode and Telephone Mode (or Duplex Mode) operation. Refer to Split Mode Operation and Telephone Mode Operation in this Pilot’s Guide for additional information.
When switching between COMs, such as from COM 1 to COM 2 (while COM 2 AUDIO has been selected), COM 1 audio will continue to be heard. This eliminates the need for the pilot to switch the COM 1 audio back on, if desired.
When switching from COM 1 to COM 2 (while COM 2 AUDIO has not been selected), COM 1 audio is switched off. This means that switching the COMs does not affect the selection of the COM receiver audio.
The audio panel gives priority to the pilot’s PTT switch. If the copilot is transmitting and the pilot presses the PTT switch, the pilot’s microphone is heard over the selected COM transmitter.
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Feb/06 | KMA 29 Audio Panel Pilot’s Guide | 11 |
