Cabin Systems Quiz
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Questions and Answers

Which of the following systems is NOT directly linked to the DIRs using discrete and audio signals?

  • Passenger Service Units (PSU) (correct)
  • Flight Warning Computer (FWC)
  • Engine Interface and Vibration Monitoring Unit (EIVMU)
  • Audio Management Unit (AMU)

    • What is the primary distinction between a Type-A (DEU-A) and Type-B (DEU-B) Decoder/Encoder Unit?

  • DEU-A is used for flight control systems, while DEU-B is for navigation systems.
  • DEU-A is dedicated to cabin-related systems and crew functions, while DEU-B is used on passenger-related systems.
  • DEU-A is used on passenger-related systems, while DEU-B is dedicated to cabin-related systems and crew functions. (correct)
  • DEU-A is used for engine control systems, while DEU-B is for entertainment systems.

    • Which of the following systems is directly controlled by the Decoder/Encoder Unit Type-A (DEU-A)?

  • Landing Gear Control and Interface Unit (LGCIU)
  • Passenger Service Units (PSU) (correct)
  • Engine Interface and Vibration Monitoring Unit (EIVMU)
  • Cabin Pressure Controller (CPC)

    • What factor determines the number of Decoder/Encoder Unit Type-As (DEU-As) installed on an aircraft?

    <p>The number of inputs/outputs required, which is dependent on the cabin layout, installation of optional systems and aircraft type. (B)</p> Signup and view all the answers

    How are the Decoder/Encoder Unit Type-As (DEU-As) connected to the DIRs for redundancy purposes?

    <p>Through a CIDS data-bus, using two top line data buses on each side of the left, center and right seat isles, with alternating connections. (B)</p> Signup and view all the answers

    What component is installed in the end connection box of each DEU-A data bus chain?

    <p>A Bus Termination Resistor (BTR). (D)</p> Signup and view all the answers

    What identifies the installation address of each DEU-A?

    <p>Coding switches installed in each DEU-A connection box. (B)</p> Signup and view all the answers

    What type of data bus is used to control the Attendant Indication Panel (AIP) through the Data Entry Unit B (DEU-B)?

    <p>RS 232 (D)</p> Signup and view all the answers

    What voltage is supplied to the Attendant Indication Panel (AIP) through the Data Entry Unit B (DEU-B)?

    <p>28V DC (A)</p> Signup and view all the answers

    What is the purpose of the Built-In Test Equipment (BITE) in the Attendant Indication Panel (AIP)?

    <p>To detect internal failures within the AIP. (B)</p> Signup and view all the answers

    Where are Area Call Panels (ACPs) typically installed in the aircraft cabin?

    <p>On the right and left-hand sides of the ceiling at each end of the cabin zone (C)</p> Signup and view all the answers

    What type of light source is used in the Area Call Panels (ACPs)?

    <p>Light Emitting Diodes (LEDs) (D)</p> Signup and view all the answers

    What does an amber light indicate on the Area Call Panel (ACP)?

    <p>Lavatory call (A)</p> Signup and view all the answers

    Which color illuminates on the Area Call Panel (ACP) when there is a call via the cabin or cockpit interphone?

    <p>Pink (C)</p> Signup and view all the answers

    Which component switches the LEDs in the Area Call Panel (ACP)?

    <p>Data Entry Unit B (DEU-B) (C)</p> Signup and view all the answers

    Where are individual texts stored for display on the upper and lower lines of the Attendant Indication Panel (AIP)?

    <p>Cabin Management System (CAM) (D)</p> Signup and view all the answers

    What is the primary purpose of the Passenger Visual Information System (PVIS)?

    <p>To supply passengers with in-flight visual information. (A)</p> Signup and view all the answers

    How does the PATS (Passenger Airline Telephone System) transmit data to the ground?

    <p>Using the aircraft's Satellite Communication (SATCOM) system. (C)</p> Signup and view all the answers

    Which component acts as the main computer for the Passenger Visual Information System (PVIS)?

    <p>PVIS Processor Unit (Digital Interface Unit or DIU). (C)</p> Signup and view all the answers

    What type of data is NOT supplied to passengers through the Passenger Visual Information System (PVIS)?

    <p>Internal financial data of the airline. (C)</p> Signup and view all the answers

    Which of the units has the master control for communication between the fax, the optional credit card reader module and the bearer system in the satellite telephone/fax system?

    <p>System Control/Interface Module. (B)</p> Signup and view all the answers

    What parameters are monitored by the door and slide control system?

    <p>Door and escape slide bottle-pressure reservoir (B)</p> Signup and view all the answers

    Where is the status of the doors and escape slides reported to?

    <p>Flight Attendant Panel (FAP) and Central Maintenance System (CMS) (B)</p> Signup and view all the answers

    What is the purpose of the vacuum system in the water/waste system?

    <p>To display the potable and wastewater tanks’ levels on the FAP. (B)</p> Signup and view all the answers

    Which of the following is a function controlled by the passenger service system?

    <p>Operating passenger reading lights (B)</p> Signup and view all the answers

    What is the role of the CIDS in relation to the In-Flight Entertainment (IFE) system?

    <p>To control music, video, and games accessible at each passenger seat. (D)</p> Signup and view all the answers

    Which signs are controlled by the passenger lighted-signs system?

    <p>No Smoking (NS), Fasten Seat Belt (FSB), Return to Seat (RTS), and EXIT signs. (B)</p> Signup and view all the answers

    Under what conditions will the 'No Smoking' signs automatically illuminate?

    <p>If the landing gear is down and locked, or slats are extended and oil pressure is high. (B)</p> Signup and view all the answers

    Which component activates the passenger signs during a rapid decompression?

    <p>Cabin Pressure Controller (CPC) (A)</p> Signup and view all the answers

    What additional alert accompanies the automatic activation of passenger signs during rapid decompression?

    <p>A passenger attention chime. (D)</p> Signup and view all the answers

    What aspect of cabin environment does CIDS directly manage?

    <p>Illumination (A)</p> Signup and view all the answers

    What is the primary function of the Server Interface Unit (SIU)?

    <p>To interface between the airline network and the aircraft avionics, hosting applications and an ethernet switch. (C)</p> Signup and view all the answers

    Which component provides a common data file storage system for loadable software and other applications?

    <p>Aircraft Network Server Unit (ANSU) (C)</p> Signup and view all the answers

    With which unit is the Aircraft Network Server Unit (ANSU) interfaced for ground network connection?

    <p>Terminal Wireless LAN Unit (TWLU) (D)</p> Signup and view all the answers

    What standard does the Cabin Network System (CNS) use for high-speed communication connection?

    <p>IEEE 802.3 (B)</p> Signup and view all the answers

    Which of the following is NOT a component of the Cabin Network System (CNS)?

    <p>Aircraft Network Server Unit (ANSU) (B)</p> Signup and view all the answers

    What is the primary function of the Ethernet Switch Unit (ESU) within the Cabin Network System?

    <p>To control the interfaces between the Cabin Network System units and connected devices. (C)</p> Signup and view all the answers

    The data communication service provides which of the following facilities in the aircraft cabin area?

    <p>Wireless ethernet/email, telephone, and fax (D)</p> Signup and view all the answers

    Which network allows the connection of ethernet LRUs to the SIU?

    <p>Avionics Local Access Network (LAN) (B)</p> Signup and view all the answers

    Which users can connect devices like laptops to the LAN using the CNS system?

    <p>Flight crew, cabin crew, passengers and maintenance personnel (C)</p> Signup and view all the answers

    What type of labels does the SIU support from avionics LRUs?

    <p>Input and output labels (C)</p> Signup and view all the answers

    Flashcards

    DIR Signals

    Discrete and audio signals linking with various aircraft systems.

    Decoder/Encoder Unit

    Devices that translate data for cabin and passenger systems.

    DEU-A

    Type-A Decoder/Encoder used for passenger-related systems.

    DEU-B

    Type-B Decoder/Encoder focused on cabin-related and crew functions.

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    CIDS Data Bus

    The communication network connecting DEU-A to DIRs.

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    Bus Termination Resistor

    Device ensuring signal integrity at the end of data bus connections.

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    Redundancy in Systems

    Backup systems to ensure functionality in case of failure.

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    Attendant Indication Panel (AIP)

    A device at cabin attendant stations displaying operational messages and alerts.

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    Function of AIP

    Indicates cockpit and cabin handset operations and passenger-related alerts.

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    BITE in AIP

    Built-In Test Equipment detecting internal failures of the AIP.

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    28V DC supply to AIP

    Voltage required for powering the Attendant Indication Panel.

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    Area Call Panel (ACP)

    A panel used to alert cabin attendants from specific zones in the cabin.

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    LED indicators on ACP

    Light Emitting Diodes representing different call types/colors on the ACP.

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    Types of calls on ACP

    Indications such as cabin or cockpit calls, passenger calls, or lavatory requests.

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    Link between ACP and DEU-B

    ACP connects to DEU-B allowing control of LED indicators.

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    DEU-B in aircraft systems

    Data bus interface that manages inputs for various cabin systems like AIP and ACP.

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    PATS

    A system using SATCOM for data transmission to the ground.

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    Fax Machine

    Equipment for sending voice and data over phone lines.

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    SATCOM

    Satellite Communication system connecting various aircraft systems.

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    PVIS

    Passenger Visual Information System displaying flight data to passengers.

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    CMT

    Cabin Management Terminal setting modes of Airshow operation.

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    Server Interface Unit (SIU)

    Interface between airline network and aircraft avionics for applications and networking.

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    Door Control System

    Monitors door and escape slide pressure at exits during flight.

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    Aircraft Network Server Unit (ANSU)

    Storage system for loadable software and applications on an aircraft.

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    Escape Slide Pressure

    Pressure in the slide bottle for emergency evacuation.

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    Data Communication Service

    Handles communication between the user and aircraft network system via data links.

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    Wireless Ethernet/Email Services

    Provides high-speed internet connectivity throughout the aircraft cabin.

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    CIDS

    Cabin Intercommunication Data System used for passenger systems.

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    Cabin Network System (CNS)

    System that supplies communication connections for the aircraft cabin.

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    Water/Waste System

    Tracks levels of potable and wastewater using a vacuum system.

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    Ethernet Switch Unit (ESU)

    Controls the interfaces between CNS units and connected devices.

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    Passenger Service System

    Controls reading lights and passenger calls during flight.

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    In-Flight Entertainment (IFE)

    System controlling music, video, and games at passenger seats.

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    Cabin Network Server Unit (CNSU)

    Part of CNS that manages network services within the cabin.

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    Cabin Wireless LAN Unit (CWLU)

    Facilitates wireless connections within the aircraft cabin.

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    Cabin Lighted Signs

    Controls NS, FSB, RTS, and EXIT signs in the cabin.

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    Terminal Wireless LAN Unit (TWLU)

    Connects ground network with the aircraft cabin network system.

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    No Smoking Sign

    Signals passengers not to smoke, controlled in cockpit.

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    Input and Output Labels

    Data identifiers from avionics Line Replaceable Units (LRUs).

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    Fasten Seat Belt Sign

    Informs passengers to buckle up during travel.

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    Cabin Illumination Control

    Independently manages lighting in various cabin areas.

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    Study Notes

    Cabin Systems (11.20) Learning Objectives

    • Describe the purpose and operation of units and components enabling passenger entertainment (voice, data, music, and video) and communication (voice and data) within the aircraft.

    Cabin Intercommunication Data System Architecture for Aeroplanes

    • The Cabin Intercommunication Data System (CIDS) is a microprocessor-based system controlling and displaying cabin functions for passengers and crew. It's an Airbus system.
    • CIDS components: CIDS Director (DIR), Data links, Decoder/Encoder Unit A (DEU A), Decoder/Encoder Unit B (DEU B), Forward Attendant Panel (FAP), Additional Attendant Panel (AAP), Area Call Panel (ACP), Attendant Indication Panels (AIP).

    CIDS Director

    • CIDS Directors (DIRs) are the central control and interface components within the CIDS system.
    • There are two identical directors (DIRs) for redundancy, one active and one in hot-standby mode.
    • Each DIR receives the same inputs and processes information. Results are compared via a crosstalk bus.
    • Each DIR has an Onboard Replacement Module (OBRM) to store software for the current cabin layout and related equipment.
    • DIRs interface with other system components via data links, discrete signals, and audio lines.
    • The main data links used by the directors are the CIDS bus and ARINC 429 bus.

    CIDS Bus

    • The CIDS bus is a proprietary serial half-duplex data bus using two twisted, shielded cables.
    • Each cable is terminated with Bus Termination Resistors (BTRs).
    • The BTRs are only available in the last DEU connection box in each chain.
    • Connected through CIDS data links are DEU type A, DEU type B, and between DIR 1 and DIR 2 (crosstalk bus).

    ARINC 429 Bus

    • The ARINC 429 bus is a simplex bus primarily interfacing with onboard aircraft system components.
    • Connected components/systems include Flight Attendant Panel (FAP), Vacuum System Controller (VSC), Environmental Conditioning System (ECS), Smoke Detection Control Unit (SDCU), Centralised Maintenance Computer (CMC), In-Flight Entertainment system (IFE), and System Data Acquisition Concentrator (SDAC).

    Discrete Input/Outputs and Audio Signals

    • Discrete inputs/outputs (single-wire) and audio (analogue) signals connect to the DIRs.
    • The DIRs link to components including Slat Flap Control Computer (SFCC), Landing Gear Control and Interface Unit (LGCIU), Engine Interface and Vibration Monitoring Unit (EIVMU), Cabin Pressure Controller (CPC), call panel, cockpit door, cabin pressure/exit signs relay, Flight Warning Computer (FWC), Audio Management Unit (AMU), Cockpit handset, Service interphone boomsets, and In-Flight Entertainment system (IFE).

    Decoder/Encoder Unit

    • There are two types of decoder/encoder units: type-A (DEU-A) is used for passenger-related systems, and type-B (DEU-B) for cabin-related systems and crew functions.

    Decoder/Encoder Unit Type-A (DEU-A)

    • Controls passenger-related systems including Passenger Service Units (PSU), PAX lighted signs (FSB/NS/RTS), PAX call lights, and loudspeakers.
    • The number of DEU-As depends on the aircraft cabin layout and optional systems. (e.g., A320 has 16, A380 has 85).
    • DEU-As are connected to DIRs through a CIDS data bus, with two top line data buses on each side of the cabin for redundancy.
    • Each DEU-A connection box contains coding switches for its installation address. The last connection box has a Bus Termination Resistor (BTR).

    Decoder/Encoder Unit Type-B (DEU-B)

    • Controls cabin-related systems and crew functions, including Area Call Panels (ACP), Attendant Indication Panels (AIP), Additional Attendant Panels (AAP), Handsets, Emergency Power Supply Unit (EPSU), Slide/door pressure sensors, and drain mast heating monitoring.
    • Not all inputs/outputs are used on each DEU-B.
    • Each DEU-B connection box has coding switches for its installation address. The last connection box incorporates a Bus Termination Resistor (BTR).

    Connection Boxes

    • Connection boxes connect the CIDS data bus to all DEUs. All connection boxes must be connected, otherwise the data bus is interrupted. An error message will appear if there's a problem.

    Coding Switches

    • Coding switches to define the installation address on each DEU-A or DEU-B are located on each connection box.

    Forward Attendant Panel (FAP)

    • Used by cabin and maintenance crew to monitor and control cabin support systems.
    • Connected to DIRs via ARINC 429 data buses (sending and receiving data including BITE checks for system control and monitoring).
    • The FAP interacts with components such as Emergency Power Supply Units (EPSU) for emergency lighting, type B DEUs for evacuation, water quantity/usage indicators, vacuum system usage indicators, lavatory lighting/heater control, and cabin lighting.

    Additional Attendant Panel (AAP)

    • Used by cabin crew to activate EVAC, reset the system, indicate lavatory smoke, control cabin illumination, and activate lavatory water heaters.
    • The AAP uses an RS 232 (serial half duplex) data bus to communicate with DEU-B and a BITE system to detect internal and external failures.

    Attendant Indication Panel (AIP)

    • Installed at each cabin attendant station, it provides 28V DC supply.
    • The AIP displays information via an RS 232 data bus and it includes 16-character displays dividing information into two rows relevant to cockpit, cabin handset operation, smoke detection or special system information (e.g., PA in use). Indicates alphanumerical messages.

    Area Call Panel (ACP)

    • Typically located on the ceiling in the cabin, for cabin attendants; used to attract their attention.
    • ACP use coloured LED lights. The lights can be programmed to flash or illuminate steadily.
    • Colour codes indicate specific calls (pink=cabin call, blue=passenger call, amber=lavatory call).
    • Includes passenger address, pre-recorded announcement/boarding music, cabin interphone, service interphone, and crew signalling/alerting.

    Passenger Address and Integrated Pre-Recoded Announcement/Boarding Music

    • This system enables announcements from the cockpit using handsets or other devices.
    • This system can also be linked to pre-recorded audio announcements and boarding music.

    Cabin Interphone System

    • Used for communication between cabin crew stations or between cockpit and cabin crew stations.
    • Cockpit communication uses a cockpit handset, and cabin communication can use any cabin crew station handset.
    • Conference modes are possible within the system.

    Service Interphone System

    • Used for communication between service interphone stations or cockpit/cabin crew.
    • Works during maintenance if landing gear is down and locked or manually engaged (i.e. override button).

    Operation from the Cockpit

    • Acoustic equipment in the cockpit transmits audio signals to an Audio Management Unit (AMU).
    • AMU sends signals to the CIDS Director (DIR).
    • DIR transmits signals to attendant stations & service interphone jacks.

    Operation from the Attendant Station (and Service Interphone)

    • Attendant presses a key on their handset to send signals to the CIDS Director through DEU-B.

    Crew Signalling

    • Provides visual and aural warnings in cockpit and cabin for unusual cabin or cockpit behaviour.

    CIDS Indicating and Control Functions

    • CIDS monitors and displays performance data on the FAP (Forward Attendant Panel).
    • It controls systems like emergency lighting (battery testing), ice protection and control (e.g., flexible heater foil) door/slide bottle pressure, and various other systems.

    Vacuum System/Water and Waste System

    • The CIDS interfaces with vacuum systems for monitoring levels (potable and wastewater tanks) via displays on the FAP.

    Passenger Service Control Functions

    • Controls passenger reading lights (and deactivation), passenger calls.
    • Interacts with the In-Flight Entertainment (IFE) system controlling music, videos, and games.
    • This system controls No Smoking (NS), Fasten Seat Belt (FSB), Return-to-Seat (RTS), and EXIT signs.
    • In the event of rapid decompression, it automatically turns on the NS, FSB and EXIT signs.

    Cabin Illumination

    • CIDS controls the illumination levels (bright, dim 1, dim 2) of various cabin areas via buttons on the FAP (Forward Attendant Panel).

    Emergency-Evacuation

    • Signals are triggered in the cockpit or the FAP (Forward Attendant Panel), issuing visual and audible warnings for crew during an evacuation.
    • The system transmits appropriate data to DEU-A or DEU-B and then to the Director.

    Cabin Programming

    • Enables customization of cabin zones via the FAP, including smoking zones.
    • The data for programming/reconfiguration is stored in the CAM module.

    CIDS Warnings

    • CIDS warnings or failure indications are shown on the PTP (Programming and Test Panel) and CIDS caution lights on the FAP (Forward Attendant Panel).
    • A BITE (built-in test equipment) system monitors and reports failures in the system.

    Cabin Network Service-Passenger Cabin Network Services

    • The Cabin Network Service (CNS) is part of the Aircraft Information Network System (AINS).
    • Provides Passengers with Data communication service ,Wireless Ethernet/email service ,Telephone and fax facilities, and Visual information (e.g., airshow, passenger information)

    Aircraft Information Network System (AINS)

    • Functions include host platform for aircraft maintenance and operations, secured avionics interface, virtual link between the aircraft’s Ethernet network and ground-based airline networks.
    • System architecture consists of Server Interface Unit (SIU), and Aircraft Network Server Unit (ANSU).

    Wireless Ethernet/Email Services

    • Provides high-speed ethernet connection via IEEE 802.3 and various protocols, linking laptops and other devices to LAN (Local Area Network).
    • Includes components like Ethernet switch unit (ESU), Cabin Network Server Unit (CNSU), Cabin Wireless LAN Unit (CWLU), antenna, and cabin connector.

    Cabin Network Server Unit (CNSU)

    • Manages system processing and data storage.
    • Provides application software installations.
    • Connects with the Central Maintenance Computer (CMC) for system status and defect reports.

    Antenna CWLU

    • A wireless antenna unit supporting cabin-wide connectivity with RF signals between 2.4 and 2.5 GHz, allowing communication with other network devices.

    Cabin Connector

    • A wired network connection supporting data transfer with the cabin crew, with up to 100 Mbps speed.

    Interface Systems of the Cabin Network System

    • Includes system interfaces with the Forward Attendant Panel (FAP), In-Flight Entertainment system (IFE), Aircraft Information Network System (AINS), Landing Gear Control, Cabin Telephone Unit (CTU), Centralized Maintenance Computer (CMC).

    Passenger Air-to-Ground Telephone/Fax System (PATS)

    • Facilitates faxing and global phone calls during flight using satellite communication.
    • Employs satellite communication (SATCOM) for reliable worldwide fax service.

    Passenger Visual Information System (PVIS)

    • Presents real-time flight and destination data, aircraft position, maps, airport details and countries along the flight path through Passenger Entertainment System (PES) via display units (mounted in the overhead or seat).

    Cabin Passenger Management System (CPMS)

    • Manages comprehensive cabin-related data, including (e.g. passenger lists, configuration reports, pre-flight and post-flight checklists, etc.
    • Supports passenger management, data storage, passenger service, passenger information.
    • A modular system for easy expansion.
    • Consists of Cabin Passenger Management Unit (CPMU), CPMS management terminal (CMT), and the Cabin Passenger Management Bus (CPMB)

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    Cabin Systems PDF

    Description

    Test your knowledge on Decoder/Encoder Unit Type-A and Type-B systems used in aircraft. Understand the connections, data buses, and functions related to the Attendant Indication Panel and Built-In Test Equipment. Perfect for aerospace engineering students and professionals.

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