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Audio Miscellaneous Panel

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Audio Miscellaneous Panel

Overview

The Audio Miscellaneous Panel provides controls for initiating interphone calls between the flight crew and various service areas or maintenance staff, including emergency cabin calls. It includes momentary switches for contacting mechanics, cabin attendants, and service areas, as well as toggles to activate interphone channels.

Panel Components

CALL MECH Switch

  • A momentary push switch for ground crew communication.
  • Push and hold: Activates a call to ground personnel and triggers the mechanic call horn located in the nose landing gear bay.
  • Release: Ends the call.

CALL AFT Switch

  • Used to initiate a call to the AFT service area.

  • When pressed:

    • Red light illuminates on the AFT integrated passenger sign.
    • Single high and low chime plays through cabin speakers.
    • The CAPT light on the AFT attendant handset lights up.

  • The crew will hear prompt tones once the call connects.

Note

  • The cabin interphone transmission channel must be selected.
  • If unanswered, the call ends automatically after 60 seconds.

CALL ALL Switch

  • Initiates a broadcast call to all service areas (FWD and AFT).

  • When pressed:

    • Red lights on FWD and AFT service indicators illuminate.
    • Dual-tone chimes play.
    • CAPT lights on both FWD and AFT attendant handsets activate.

  • The flight crew will hear connection prompt tones after the call is picked up.

Note

  • The cabin interphone transmission channel must be selected.
  • If unanswered, the call ends automatically after 60 seconds.

CALL FWD Switch

  • Similar in function to CALL AFT, but targets the FWD service area.
  • Functions identically, with lights, chimes, and handset indicators corresponding to the forward section of the cabin.

SERV INT Switch

  • Toggles the service interphone system.
  • Pushed (ON): Connects the flight crew interphone with ground maintenance interphone stations.
  • Released (OFF): Disconnects the service interphone; the crew can only communicate with the external power panel maintenance station.

EMER Call Switch

  • Used to initiate an emergency cabin call.

  • Pushed:

    • Red CALL ON light illuminates.
    • Triggers high-priority emergency chimes (triple high/low tones).
    • EMER indicators flash on FWD and AFT attendant handsets.

  • Once connected, two prompt tones confirm the call.

  • Released: Deactivates the emergency call.

Note

  • The cabin interphone transmission channel must be selected.
  • If unanswered, the call ends automatically after 60 seconds.

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