ARINC 429 Quiz & Flashcards: CMC Switching Systems

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Questions and Answers

What is the purpose of the ARINC 429 link between CMC 1 and CMC 2?

To display warnings and system information

To enable cross-talk and exchange general data (correct)

To monitor operational data

To classify system failures

What happens to warnings on the ECAM display?

They are cancelled at the end of the flight

They are displayed until manually cancelled

They are displayed until the end of the flight unless cancelled (correct)

They are never cancelled

Where are fault codes and messages stored?

On the MCDU

In a non-volatile memory system (correct)

On the ECAM display

In a volatile memory system

What type of failures are displayed as warnings in real-time on the ECAM?

Class 1 failures Signup and view all the answers

What is the purpose of the flight warning computers?

To monitor the operational data Signup and view all the answers

What happens if CMC 1 faults or is manually switched?

CMC 2 becomes the master Signup and view all the answers

What is the consequence of a Class 2 failure for the current flight?

No operational consequence for the current flight Signup and view all the answers

What type of failure has no operational or safety consequences for the aircraft?

Class 3 failure Signup and view all the answers

How are Type 1 system computers connected to the CMC?

Both ARINC 429 output and input buses Signup and view all the answers

What is the purpose of a discrete input in Type 2 systems?

To initialise the system test Signup and view all the answers

What is the output connection of Type 2 systems?

ARINC 429 output bus Signup and view all the answers

How many flights can Type 1 systems memorise failures for?

64 flights Signup and view all the answers

What is displayed on the data loader LCD during transfer?

TRANSFER IN PROG Signup and view all the answers

What type of storage media was commonly used in older data loaders?

3.5-inch disk or CD-ROM Signup and view all the answers

What is used to load Field Loadable Software (FLS) into the target hardware?

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

What should be done after loading a Loadable Software Aircraft Part (LSAP)?

All of the above Signup and view all the answers

Where should a copy of the loading record be kept?

Both on-board the aircraft and in the operator's records Signup and view all the answers

Who must issue a Certificate of Release to Service after loading a Loadable Software Aircraft Part (LSAP)?

Line/base maintenance staff Signup and view all the answers

What is essential for operators to have in place for their aircraft fleet?

Appropriate procedures to determine equipment and software configuration Signup and view all the answers

What is the main purpose of a Digital Electronic Library System (DELS)?

To integrate all technical data for a given aircraft Signup and view all the answers

What replaced most of the normal cockpit paperwork?

A computer-based reference system Signup and view all the answers

What is an example of the information provided by a Digital Electronic Library System?

System or spare part information Signup and view all the answers

What is a benefit of a Digital Electronic Library System in the case of an engine emergency?

It produces relevant checklists Signup and view all the answers

What is a Digital Electronic Library System typically interfaced with?

Flight management system Signup and view all the answers

What is the primary purpose of Electronic Flight Bags (EFBs)?

To replace aeronautical charts and reference books Signup and view all the answers

Where are Electronic Flight Bag displays usually installed?

On side panels of the cockpit Signup and view all the answers

According to the Civil Aviation Authorities, how many classes of EFB hardware are defined?

3 Signup and view all the answers

What is characteristic of Class 1 EFB systems?

They are portable and do not require administrative control Signup and view all the answers

What is a key difference between Class 1 and Class 2 EFB systems?

Their attachment to a mounting device Signup and view all the answers

What is possible with Class 2 EFB systems?

Connection to avionics equipment Signup and view all the answers

Study Notes

Electronic Flight Bag (EFB)

EFBs replace traditional reference materials like books and charts on flight decks.
They are typically displayed on additional cockpit panel units.
Civil Aviation Authorities define three classes of EFB hardware.

Class 1 EFB

Class 1 EFBs are portable, Commercial Off-the-Shelf (COTS) systems for aircraft operations.
They connect to aircraft power through a certified source but are not mounted in the cockpit.
No prior administrative control is needed for use.
Considered Portable Electronic Devices (PEDs).

Class 2 EFB

Class 2 EFBs are also portable and COTS-based, meant for aircraft operations.
They require mounting in the cockpit and airworthiness approval before usage.
Connectivity to avionics is enabled.
Can interface with Central Maintenance Computers (CMC) for data exchange.

CMC Functionality

CMCs can communicate via ARINC 429 links allowing them to share status data and manage fault situations.
Each CMC can determine which is the master based on fault status or manual selection.

Flight Warning Computers and ECAM

Flight warning computers track operational data to provide real-time warnings and system information.
Failures are logged in non-volatile memory for later recall; critical failures are displayed in real-time on the ECAM during the flight.
System failures are classified into three categories based on their operational and safety impact.

Failure Classifications

Class 1 Failures: Impact current flight operations, shown as real-time warnings on ECAM and MCDU.
Class 2 Failures: No impact on current flight. Reported on ECAM STATUS page.
Class 3 Failures: No operational or safety impact, only visible on the ground.

Software Management

Field Loadable Software (FLS) is updated via Portable Data Loaders (PDL) or Airborne Data Loaders (ADL).
Post-loading verification of software is required per maintenance manuals.
Updates must be documented in the Aircraft Configuration List (ACL), with records maintained both on-board and in maintenance logs.

Electronic Library Systems

Modern airlines use Digital Electronic Library Systems (DELS) to integrate various operational documents, replacing paper-based systems.
DELS includes aircraft manuals, maintenance data, checklists, and is integrated with flight management systems.
In emergencies, systems can quickly reference relevant checklists or operational manuals.

Aeroplane System Computers

Various aircraft systems are tied to the Central Maintenance Computer (CMC) with distinct hardware connections.
Type 1 Systems: Connected to both CMCs and can store failure data from the last 64 flights for troubleshooting.
Type 2 Systems: Store failure data only from the last flight, activated by a discrete input for testing.

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Description

Test your knowledge of aircraft systems, including the interface between CMC 1 and CMC 2, ARINC 429 link, and cross-talk functionality. Learn about the role of CMC switching in ensuring system redundancy and fault tolerance. Prepare for your CASA Part 66 exam with this quiz.

Aircraft Systems: CMC Switching and ARINC 429

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