NAVIGATION AND
COMMUNICATION
AIRPLANE
OPERATIONS
MANUAL
2-18-27
Page
2
Code
01
REVISION 31
PASSENGER ADDRESS OPERATING MODES
MUTED MODE
The Muted Mode is automatically selected during power up and when
no other mode is selected. In this mode there will be no chimes, no
lights and no microphones enabled during power up or power supply
transients.
PILOT-TO-PASSENGER MODE
The Pilot-to-Passenger Mode is enabled by momentarily pressing the
Passenger Button, labeled PAX, on the Digital Audio Panel. When this
mode is enabled the captain, copilot or observer may transmit
announcements to the passengers, by pressing the respective
PTT/HOT-MIC switches. The priority of the transmission through the
system is the following: captain, copilot, observer. There are no chimes
in this mode.
ATTENDANT-TO-PASSENGER MODE
The Attendant-to-Passenger Mode is enabled by pressing the PA
Button in the Attendant Handset. When this mode is enabled the flight
attendant may transmit announcements to the passengers, by pressing
the Attendant Handset PTT. If the PAX Button is selected on the Digital
Audio Panel in the cockpit, besides listening the attendant
announcements in the cockpit speaker or headphones, the pilots and
observer take priority over the attendant announcements.
Some airplanes have a knob installed in the main panel or in the
control pedestal which allows to adjust the volume of the PA
announcements in the flight deck.
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