Audio Control Panel
The reception knobs allow for receiving associated channels and adjust audio levels. When the knob is released out, the respective channel is selected and the knob illuminates.
AUDIO CONTROL PANEL LOCATION - The ACPs are located on the control pedestal. The Captain, First Officer and jump seat positions all have audio control panels numbered 1 through 3. The ACPs provide the transmission and reception of all communication, standby navigation, interphone (flight and cabin), and passenger address (PA) systems.