Sir dara midterms

• Remote Electronic Unit (REU)


  A digitally controlled, multiplexed audio management unit that manages the communication between the flight deck stations, service and flight interphone, and all related communication, radio, navigation, and recorder system
• REU function


  • Determines which selections have been made on the ASP, and then sends appropriate signals to the selected systems
• Audio outputs from REU

  • To each flight crew station
  • To the external power panel
  • For the boom microphone/headsets
  • For the headphone jacks
  • To drive the pilot's overhead speakers
• Audio amplifiers in REU

  • One used with the flight interphone
  • One used with the service interphone
• Flight interphone system


  Provides the flight crew with capabilities to communicate with each other and provides the means for them to transmit and receive on airplane communication radio systems and receive on airplane navigation radio systems
• Service interphone system


  Provides interphone communications between the flight crew, the attendants, and ground crew personnel
• Components of service interphone system

  • Remote electronics unit
  • Service interphone switch
  • Attendants handsets
  • Service interphone jacks
  • Control stand handset
• Passenger Address (PA) system

  • Supplies voice messages, and chime signals via speakers to all passengers and attendants in the passenger cabin
  • Supplies boarding music via the speakers to the passenger cabin
• Discrete signals from the passenger signs system


  Cause a low tone chime signal to be sounded whenever the NO SMOKING or the FASTEN SEAT BELT signs are switched on or off
• Public Address (PA) System


  Allows the flight crew to make announcements to passengers throughout the cabin. The PA controls are typically located in the cockpit, accessible to the pilots.
• Passenger Service Unit (PSU)


  Located above each row of passenger seats. It contains various controls, including reading lights, call buttons, and audio controls for the in-flight entertainment system.
• Cabin Interphone System


  Allows communication between the flight crew and cabin crew members. Interphone handsets are typically located at various stations throughout the cabin, including the galley area and emergency exits.
• Cockpit Voice Recorder (CVR)

  Records audio from the cockpit area, including communication between the pilots and air traffic control. The CVR is located in the cockpit, usually in the rear portion of the overhead panel.
• Cockpit Audio Control Panel

  Provides the pilots with controls for managing audio sources and communication channels, including radio frequencies and audio inputs from external sources. The cockpit audio control panel is typically located on the center console between the two pilots' seats.
• Flight Attendant Panel


  A control panel located in the cabin area of the aircraft, usually near the galley or crew rest area.
• Boom microphone


  Attached to a flexible arm (the "boom") and positioned near the pilot's mouth for clear communication during radio transmissions
• Boom microphone is commonly used for communicating with air traffic control and other aircraft
• Hot Microphone/Button Microphone


  • Type of microphone often built into the control yoke or joystick in front of each pilot, activated when the pilot presses a button on the control yoke or joystick
  • Allows for quick and convenient communication without needing to use the boom microphone
• Cockpit Area Microphones


  • Microphones installed in various locations throughout the cockpit to capture ambient cockpit noise, including sounds such as switches being toggled, alarms, and other environmental sounds
  • Provide additional context during playback of the cockpit voice recording
• Handheld Microphones


  Microphones available for use by the pilots or other crew members, can be used as backups or for communication during non-standard situations
• CVR is located at the AFT cargo
• B737 HAS 1 ATTENDANT PANEL WHILE AIRBUS HAVE 2 ATTENDANT PANELS