Aircraft Central Maintenance System: On-Board Quiz and Flashcards

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Questions and Answers

What is the primary function of the Central Maintenance Computer?

To initiate self-tests via the MCDU

To acquire and process data from BITE memories (correct)

To display output messages from interrelated systems

To control the flight warning computers

What is the purpose of the Multipurpose Control and Display Units?

To initiate self-tests of the Flight Warning Computers

To control interrelated systems and display relevant output messages (correct)

To provide a centralised location for aircraft fault information

To memorise fault data from system computers

In which mode can the operator obtain troubleshooting data from the systems?

BITE mode

Normal mode

Real-time mode

Menu mode (correct)

What is the characteristic of the Normal Mode of the Central Maintenance System?

Based on permanent real-time memorisation of fault data Signup and view all the answers

What is the output of the Flight Warning Computers in the Central Maintenance System?

Fault messages Signup and view all the answers

Where is the fault data memorised in the Central Maintenance System?

In both the system computers and the CMCs Signup and view all the answers

What is the primary function of the On-board Maintenance System (OMS) in aircraft?

To assist maintenance personnel in fault-finding of complex avionics systems Signup and view all the answers

Which system is responsible for initializing tests on aircraft systems in modern aircraft?

Central Maintenance System (CMS) Signup and view all the answers

What is the main benefit of using the On-board Maintenance System (OMS) in aircraft maintenance?

Minimizing ground time and increasing maintenance efficiency Signup and view all the answers

What are the main components of the Central Maintenance System (CMS)?

Central Maintenance Computers (CMC) and Multipurpose Control and Display Units (MCDU) Signup and view all the answers

Which of the following is NOT a function of the On-board Maintenance System (OMS)?

Flight navigation Signup and view all the answers

What is the result of using the On-board Maintenance System (OMS) in aircraft maintenance?

Improved cost effectiveness Signup and view all the answers

What information does the CMC memorise at each leg opening transition?

Leg heading, date, flight number, city pair from, start time, and A/C identification Signup and view all the answers

What is the primary purpose of having two CMCs in large modern commercial aircraft?

For redundancy purposes Signup and view all the answers

What happens when the off legend illuminates on the pushbutton switch in the cockpit overhead panel?

CMC 2 becomes active and considered the master Signup and view all the answers

What is the result of a CMC BITE failure?

A failure indication is displayed on the MCDU and printer Signup and view all the answers

How can the CMC be switched in normal operation?

Through a BITE fault, MCDU selection, or a pushbutton switch Signup and view all the answers

What is the purpose of the Management Unit (MU) in the ACARS system?

To send failure details to the main base Signup and view all the answers

What is the primary function of the Aircraft Communication Addressing and Reporting System (ACARS)?

To send maintenance information from the aircraft to maintenance personnel at the destination station Signup and view all the answers

What is the main purpose of a data loader in an aircraft?

To update software on the aircraft's onboard computers Signup and view all the answers

What is the benefit of integrating the Central Maintenance Computer (CMC) with the Aircraft Communication Addressing and Reporting System (ACARS)?

It enables maintenance personnel to begin troubleshooting before the aircraft's arrival Signup and view all the answers

What is the role of the Central Maintenance Computer (CMC) in relation to the Aircraft Communication Addressing and Reporting System (ACARS)?

It interfaces with ACARS to send maintenance information to destination stations Signup and view all the answers

What is the purpose of a data bus coupler in relation to the data loader?

It links the data loader to the Flight Management System (FMS) Signup and view all the answers

What type of communication systems can the Central Maintenance Computer (CMC) integrate with?

Wireless LAN, Satellite Communication (SATCOM), and Aircraft Communication Addressing and Reporting System (ACARS) systems Signup and view all the answers

What type of media is commonly used in newer airborne data loaders for the transfer of information into the aircraft?

PCMCIA cards or Universal Serial Bus (USB) sticks Signup and view all the answers

What is the purpose of loading Loadable Software Aircraft Part (LSAP) into the target hardware?

To update software Signup and view all the answers

What is required after loading a Loadable Software Aircraft Part (LSAP) into the target hardware?

A Certificate of Release to Service Signup and view all the answers

What is the purpose of the Aircraft Configuration List (ACL)?

To record software updates Signup and view all the answers

What type of card is used in some airborne data loaders?

PCMCIA card Signup and view all the answers

What is used to load software into the target hardware?

Portable Data Loader (PDL) Signup and view all the answers

Study Notes

Central Maintenance System (CMS)

Acquires and processes data from BITE memories of system computers
Operates in two modes: normal mode and menu mode
Normal mode:
- Records fault messages generated by Flight Warning Computers (FWC) and failure information produced by BITE function
- Based on permanent real-time memorisation of fault data or operational BITE
Menu mode:
- Allows operator to obtain troubleshooting data from systems and initiate self-tests via MCDU
- Only available on the ground

Central Maintenance Computer (CMC)

Provides a centralised location for aircraft fault information
Files current flight and updates the 64 last legs filed in the previous flight report
Memorises new leg heading: date, flight number, city pair from, start time, and A/C identification
At each leg closing transition, CMC memorises end time and city pair to

On-Board Maintenance System (OMS)

Developed to assist maintenance personnel in fault-finding of complex avionics systems
Uses a range of techniques built into and integrated with aircraft systems
Minimises ground time, increases efficiency of maintenance processes, and improves cost-effectiveness
Consists of: Central Maintenance System (CMS), Data Loading System, Electronic Library System, and Report Printing System

CMC Switching Control and Self-Test Function

Typically, two CMCs are available in large modern commercial aircraft for redundancy purposes
CMC 1 is the master in normal operation
CMC can be switched through a BITE fault, MCDU selection, or a pushbutton switch in a cockpit overhead panel
If CMC 2 is active, the off legend illuminates on the pushbutton

Aircraft Communications Addressing and Reporting System (ACARS)

CMC can integrate with ACARS, Satellite Communication (SATCOM), wireless LAN, and other communication systems
Allows maintenance personnel at the destination to begin troubleshooting process and analysis before the aircraft arrives

Data Loading System

Used to load and update software on aircraft systems
Typically, data loaders are linked with the Flight Management System (FMS) or connected to a data bus coupler
Data loaders can be portable or integrated into the avionics system
Can be used to install and update software or download data recorded by on-board computers during aircraft operation

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Description

Learn about the On-Board Maintenance System (OMS) used in aircraft to assist maintenance personnel in fault-finding and troubleshooting of complex avionics systems. Understand its functions and applications in aircraft maintenance and engineering.

Aircraft On-Board Maintenance Systems

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