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What is the primary purpose of the On-Board Maintenance System (OMS)?
What benefit does the On-Board Maintenance System (OMS) provide in terms of maintenance processes?
What is the function of the Central Maintenance System (CMS) in the On-Board Maintenance System (OMS)?
What are the main components of the Central Maintenance System (CMS)?
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What is the result of using the On-Board Maintenance System (OMS)?
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What is one of the functions supported by the On-Board Maintenance System (OMS)?
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What is an example of a Class 2 failure?
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Where are the systems affected by Class 2 failures identified?
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What is a characteristic of Type 1 system computers?
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What is the purpose of a discrete input on Type 2 systems?
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How many flights can Type 1 system computers memorise failures for?
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What is the output connection of Type 2 systems?
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What is the primary function of electronic devices used on flight decks?
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Where are electronic display units usually installed on flight decks?
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What is a characteristic of Class 1 EFB systems?
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What is a requirement for using Class 2 EFB systems in an aircraft?
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What document contains descriptions of EFB classes of hardware?
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What is another term for Class 1 EFB systems?
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What does the CMC do at each leg opening transition?
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What is the primary function of the CMC in a commercial aircraft?
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What is the primary function of the Aircraft Communication Addressing and Reporting System (ACARS)?
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What is the purpose of a data loader in an aircraft?
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What happens when the CMC 1 experiences a BITE fault?
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How can the CMC be switched in a commercial aircraft?
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What is the benefit of integrating the CMC with ACARS and other communication systems?
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What is the purpose of the two CMCs in a large modern commercial aircraft?
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What type of data can be downloaded from the aircraft using a data loader?
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What is the typical connection point for a data loader?
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What happens when the off legend illuminates on the pushbutton switch?
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What is a characteristic of a data loader?
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Study Notes
On-Board Maintenance System (OMS) Overview
- OMS aids maintenance personnel in diagnosing complex avionics systems through integrated techniques.
- Supports various activities: aircraft maintenance (scheduled and unscheduled), engineering follow-up, and aircraft reconfiguration.
- Goals include minimizing ground time, enhancing maintenance efficiency, and improving cost-effectiveness.
Components of OMS
- Central Maintenance System (CMS): Extracts maintenance data and initiates tests across aircraft systems.
- Data Loading System: Allows the loading and updating of software in avionics systems.
- Electronic Library System: Provides access to necessary technical documentation.
- Report Printing System: Facilitates the generation of maintenance reports.
Central Maintenance System (CMS)
- Consists of Central Maintenance Computers (CMC 1 and CMC 2) and Multipurpose Control and Display Units (MCDUs).
- CMCs record flight data, including leg transitions (dates, flight numbers, airport pairs).
- Features switching control for redundancy: CMC 1 acts as master under normal operations, with CMC 2 taking over if necessary.
- Anomalies trigger alerts communicated through MCDUs and can report to maintenance bases via ACARS or ATSU.
Aircraft Communications Addressing and Reporting System (ACARS)
- CMC integrates with ACARS and other communication systems to relay maintenance information before arrival at the destination, allowing proactive troubleshooting.
Data Loading System
- Essential for software updates, typically linked with Flight Management Systems (FMS) or data bus couplers.
- Can be portable or integrated, allowing loading of updates or downloading operational data.
Electronic Flight Bag (EFB) Classes
- Class 1 EFB: Portable systems that are not mounted; do not require administrative control prior to use.
- Class 2 EFB: Mounted systems requiring airworthiness approval; can connect with avionics equipment.
- Class 3 EFB: Designed for ground use only, with limited operational or safety implications.
System Computers Types
- Type 1: Connected to CMCs via ARINC 429 bus; stores failures from the last 64 flights for in-depth troubleshooting.
- Type 2: Tracks failures from the last flight only; simpler initialization for testing through discrete input.
Failure Classifications
- Class 2 Failures: Non-operational for current flight with specific systems shown on ECAM status.
- Class 3 Failures: Have no operational or safety implications; accessible solely from ground systems.
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Description
Test your knowledge of aeroplane systems and failures, including Class 2 and Class 3 failures, and their operational consequences. Learn about the ECAM STATUS page and hydraulic pump failures. Prepare for your CASA Part 66 exam!