Central Maintenance Computer: On-Board Maintenance Systems Quiz and Flashcards

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Questions and Answers

What is the primary purpose of the On-Board Maintenance System?

To assist maintenance personnel in fault-finding of complex avionics systems (correct)

To improve aircraft aerodynamics

To monitor aircraft performance during flight

To reduce the cost of aircraft maintenance

Which of the following systems is NOT part of the On-Board Maintenance System?

Report printing system

Data loading system

Electronic flight instrument system (correct)

Central Maintenance System

What is the main function of the Central Maintenance Computers (CMC) in the Central Maintenance System?

To store maintenance data

To enable the mechanic to extract maintenance data and initialise tests on aircraft systems (correct)

To display aircraft performance data

To control aircraft flight systems

What is the benefit of using the On-Board Maintenance System?

It minimises ground time and increases the efficiency of maintenance processes Signup and view all the answers

What is the function of the Multipurpose Control and Display Units (MCDU) in the Central Maintenance System?

To display maintenance data Signup and view all the answers

What type of maintenance is supported by the On-Board Maintenance System?

Both scheduled and unscheduled maintenance Signup and view all the answers

What type of system is used in conjunction with the aircraft ECAM or EICAS cockpit display systems?

Central Maintenance Computer Signup and view all the answers

What type of warnings are transmitted to the Central Maintenance Computer (CMC)?

Only primary and independent warnings Signup and view all the answers

What is the function of the CMC's Central Processing Unit (CPU)?

To organize the received data into reports Signup and view all the answers

What is included in the post or current flight report?

All ECAM warning/caution and failure messages Signup and view all the answers

What is stored in the CMC for the Previous Flight Report (PFR)?

All ECAM and failure messages recorded during the 63 previous flight legs Signup and view all the answers

What information is included in the data stored in the CMC?

The leg heading, date, flight number, city pair, and A/C identification Signup and view all the answers

What is a characteristic of Type 3 systems?

They have a discrete input for initialising or resetting the test. Signup and view all the answers

What is the purpose of the Multifunction Control Display Unit (MCDU)?

To provide access to data from the CMC system and test aircraft systems. Signup and view all the answers

Where are the data concerning all aircraft systems stored?

In the CMC's non-volatile memories. Signup and view all the answers

What is the function of the Central Maintenance Computers (CMCs)?

To acquire and process BITE information from aircraft systems. Signup and view all the answers

How do Type 1, 2, and 3 systems send their BITE information?

In parallel to both Central Maintenance Computers. Signup and view all the answers

What is the purpose of the CMS menu?

To provide access to CMC functions for operators. Signup and view all the answers

What is the primary tool used to select and update system software in the Boeing 777 aircraft?

Cursor Control Device (CCD) of the Maintenance Access Terminal (MAT) Signup and view all the answers

What is the consequence of incorrect software loading procedures in aircraft operations?

Disastrous sequence of events Signup and view all the answers

Where can software downloads be initiated in an aircraft?

Both in-flight and on-ground Signup and view all the answers

What happens after the computer acknowledges the request from the MCDU for software downloading?

The data is sorted into files Signup and view all the answers

What is the primary purpose of the data loader selector switch in the Airbus system?

To select the computer for software loading Signup and view all the answers

Why are software and system functional and confidence checks performed after software loading?

To prevent software mismatches or glitches Signup and view all the answers

What type of computer systems are typically used in Class 1 EFB systems?

Commercial Off-the-Shelf (COTS)-based computer systems Signup and view all the answers

What is required before Class 2 EFB systems can be used in an aircraft?

Airworthiness approval Signup and view all the answers

Where are additional display units usually installed in the cockpit?

Side panels Signup and view all the answers

What is the main difference between Class 1 and Class 2 EFB systems?

Class 1 is not attached to a mounting device, while Class 2 is Signup and view all the answers

What type of devices are Class 1 EFB systems considered?

Portable Electronic Devices (PEDs) Signup and view all the answers

Which document defines the classes of EFB hardware configurations?

All of the above Signup and view all the answers

Study Notes

On-Board Maintenance Systems (OMS)

OMS is designed to assist maintenance personnel in fault-finding of complex avionics systems, minimizing ground time and improving maintenance process efficiency.
OMS consists of:
- Central Maintenance System (CMS)
- Data loading system
- Electronic library system
- Report printing system

Central Maintenance System (CMS)

CMS enables mechanics to extract maintenance data concerning most aircraft systems and initialize tests on these systems.
Main components of CMS:
- Central Maintenance Computers (CMC 1 and 2)
- Multipurpose Control and Display Units (MCDU 1, 2, and 3)
CMS is used in conjunction with aircraft Electronic Centralised Aircraft Monitoring (ECAM) or Engine Indication and Crew Alerting System (EICAS) cockpit display systems.

Central Maintenance Computer (CMC)

CMC receives primary and independent warnings or maintenance status type warnings from system BITEs.
CMC correlates messages with aircraft parameters to amalgamate fault information with time, date, flight phase, etc.
CMC stores maintenance data for retrieval, including:
- Leg heading, date, flight number, city pair from, start time, and A/C identification
- Warning messages transmitted ATA Sub ATA
- Calculated warning code and type
CMC compiles a Previous Flight Report (PFR) by storing all ECAM and failure messages recorded during the 63 previous flight legs.

Multifunction Control Display Unit (MCDU)

MCDU consists of a screen for data display, an alphanumeric keyboard, and line keys used to send commands to connected systems.
MCDU provides access to data from the CMC system and allows testing of aircraft systems, including self-tests and guided tests for system fault-finding.

Data Loading

Data loading is similar to loading software onto a home computer.
Operator uses the Cursor Control Device (CCD) of the Maintenance Access Terminal (MAT) to select and update required system software.
Correct software loads and configurations are critical to aircraft operations, and software mismatches can cause disastrous sequences of events.

Electronic Flight Bag (EFB)

EFB is an electronic device used on flight decks to perform various tasks that previously required reference books, aeronautical charts, and mathematical calculations.
The Civil Aviation Authorities define three EFB classes:
- Class 1: Portable, Commercial Off-the-Shelf (COTS)–based computer systems used for aircraft operations.
- Class 2: Portable, COTS-based computer systems used for aircraft operations, connected to aircraft power and mounting device on the flight deck.

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Description

Learn about the On-Board Maintenance System (OMS) designed to assist maintenance personnel in fault-finding of complex avionics systems. This system is a common framework for various functions supporting aircraft maintenance and engineering follow-up activities.

Aircraft On-Board Maintenance Systems