A320 AUDIO CONTROL PANEL

A320 ACP

Transmission keys

  • Pressed : The associated channel is selected for transmission. The three green lines come on. The pilot deselects the channel by pressing the pushbutton again, or selecting another channel. 
  • CALL : The legend flashes amber (and buzzer sounds) when the SELCAL system detects a call. 
  • MECH : The legend flashes amber (and buzzer sounds) for a call from the nose gear bay. The MECH light goes off after 60 s, if it is not reset. 
  • ATT : The legend flashes amber (and buzzer sounds) for a call from a cabin crew member. The ATT light goes off after 60 s, if it is not reset.

Reception knobs

  • Pressing and releasing the knob (knob out) selects the associated audio reception channel and the integral white light comes on. 
  • Rotating the knob adjusts the volume.
  • The ANN LT sw controls the brightness.
  • Pressing the knob (knob stays in) disconnects the associated audio reception channel.

Note: For reception of DME audio navigation signals associated to an ILS or MLS station, the ILS pb (or LS pb on the FCU) must also be selected. 

SELCAL/CALL RESET key

Pressing this key extinguishes CALL, MECH, and ATT lights.

ON VOICE key

This key allows the flight crew to inhibit the audio navigation signals (VOR, ADF) Pressing this key filters out ident signals and turns on the green ON light.

INT/RAD switch

This switch operates as a press-to-talk switch for boom mike or oxygen mask mike.

  • INT : Boom and mask mikes transmit on interphone regardless of which transmission key is selected. For reception on interphone, the crew member must have INT selected (INT reception knob out).
  • Neutral : Reception is normal. Boom and mask mikes do not transmit.
  • RAD (press and hold) : Boom and mask mikes transmit on the radio selected on the audio control panel.

PA transmission key

  • Pressed and held : The flight crew may use a boom, mask, or hand mike to make an announcement. Three green lines come on.
  • Note: The flight crew may use a cockpit handset to make PA announcements without action on the ACPs.

PA reception knob

  • Pressed and released (knob out) : The message goes to the loudspeakers, and the integral white light comes on. The flight crew can turn the knob to adjust the volume.
  • Pressed (knob in) : The PA reception to the loudspeakers is disconnected. The white light goes out.
⮜ Cockpit Panels
A320 Guide ⮞