3rd Audio Control Panel

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Description

Usage

Tansmission Keys

• Pressed:
  • Channel selected for transmission.
  • Green lines come on.
  • Deselecting by pressing the pushbutton again, through selecting another channel.
• CALL:
  • When the SELCAL system detects a call the legend flashes amber (and buzzer sounds).
• MECH:
  • When called from the nose gear bay the legend flashes amber (and buzzer sounds). If it is not reset, the MECH light goes off after 60 seconds.
• ATT:
  • When called from a cabin attendant, the legend flashes amber (and buzzer sounds). If it is not reset, the ATT light goes off after 60 seconds.

Reception Knobs

These knobs are used to allow the flight crew to activate a channel for reception and to adjust volume.

• Pushing the knob to "knob out" selects the channel for reception. The integral white light comes on. Rotating the knob adjusts the volume.
• Pushing the knob (knob stays in) deselects the channel for reception.

RESET

Extinguishes CALL, MECH, and ATT lights.

VOICE

Inhibit the audio navigation signals (VOR, ADF) and filters out ident signals and turns on the green ON light.

INT/RAD

Press-to-talk switch for boom mike or oxygen mask mike.

PA (Passenger Address)

Passenger Address is used by the flight personnel to make passenger announcements through loudspeakers in the cabin.

PA transmission key

Pressed and held: To make an announcement a boom, mask or hand mike is used.

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 rotate the knob to adjust the volume.
• Pressed (knob in):
  • The PA system is disconnected. The white light goes out.

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