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Communications (Technical Notes)

 
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K.Haroon
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Joined: 11 Dec 2005
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PostPosted: Thu Aug 02, 2012 8:23 am    Post subject: Communications (Technical Notes) Reply with quote

Audio Control Panel

Arrow An oxygen mask microphone is enabled and the boom microphone is disabled when the oxygen mask stowage doors are open. The oxygen mask microphone is disabled and the boom microphone is enabled when the left oxygen mask stowage box door is closed and the RESET/TEST switch is pushed.


Arrow Data Mode

The data mode can be selected and deselected on the MFD COMM display or by pushing the frequency transfer switch on the radio tuning panel. If the selected VHF radio is the default data radio (selected on the MFD COMM display), then the word DATA is displayed in the radio tuning panel active frequency window. When a standby frequency is transferred to the active window, DATA is displayed in the standby window. If a new frequency is selected in the standby window when DATA is displayed, DATA is replaced by the new frequency. Data can be returned to the standby window by selecting a frequency higher or lower than the allowable VHF frequency range.

When a VHF radio is in the data mode, it is not available for voice communications. A VHF radio can be returned to the voice communication mode by transferring a voice frequency into the ACTIVE frequency window.


Arrow Pushing the audio control panel CAB transmitter select switch twice within one second places a priority call to an airline–designated call location. A station which is in use will be disconnected from the call in progress and connected to the flight deck.
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