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Questions and Answers
What is the function of the MCDU?
What does BITE stand for?
How many MCDUs can communicate with the CMC?
Which system component is independent from its operational part?
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What is one method of retrieving the maintenance results?
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Which of the following functions does the CMC perform?
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What does the Central Maintenance Computer (CMC) primarily interact with?
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Where is the BITE located?
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What is the role of the title line in the MCDU Display?
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How many data lines are arranged in the MCDU Display?
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What does the scratchpad or message line provide to the operator?
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What font size is used for the data lines compared to the label lines?
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How are the data lines organized within the MCDU Display?
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Which of the following components is NOT part of the MCDU Display?
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What is indicated by the message on the scratchpad line?
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How is the MCDU Display designed to assist operators?
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What does ACARS stand for in the context of aircraft systems?
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What is indicated by the asterisk next to the line select key in the A340 MCDU display?
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What distinguishes the CMCS report functions on the different types of MCDUs?
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Which aircraft's MCDU is specifically mentioned as having a PRINT message function?
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What is the purpose of the line select keys on the MCDU?
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In the ACARS data link context, what primarily occurs at the MCDU?
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What is shown on the MCDU display during the CMCS report function?
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How is the ACARS data link displayed on the 747-400 MCDU?
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What does the fault message primarily indicate?
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Which component is responsible for analyzing faults in this context?
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What information does the Central Maintenance Computer (CMC) store along with the fault?
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Which statement correctly describes the purpose of the data source displayed on the MCDU page?
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What is typically included in a fault message according to the standardized format?
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What function does the Slat Flap Control Computer (SFCC) serve in the fault message process?
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After a fault is detected and analyzed, where can the fault message typically be found?
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What does BITE stand for in the context of fault analysis?
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What defines a hard failure in aircraft systems?
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What characterizes an intermittent failure?
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Which of the following is a NOT a characteristic of a hard failure?
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In what instance is a failure likely to NOT be recorded in a post flight report?
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What type of failure occurs continuously without interruption?
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How might a pilot best describe an intermittent failure during flight?
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Which failure type usually requires a troubleshooting process to identify?
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What is the primary distinction between hard and intermittent failures?
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Study Notes
MCDU Function
- The MCDU serves as a central hub for aircraft data and functions, allowing pilots to access vital information and manage system operations.
BITE Acronym
- BITE stands for Built-In Test Equipment.
CMC Communication
- Multiple MCDUs can communicate with the Central Maintenance Computer (CMC).
System Component Independence
- The Central Maintenance Computer (CMC) is independent from its operational parts.
Maintenance Results Retrieval
- One way to retrieve maintenance results is through the Central Maintenance Computer (CMC).
CMC Functions
- The CMC processes and stores fault data.
- The CMC facilitates communication between MCDUs and other aircraft systems.
- The CMC helps to keep track of aircraft maintenance requirements.
CMC Interaction
- The Central Maintenance Computer (CMC) primarily interacts with the MCDU and other aircraft systems.
BITE Location
- The BITE is located within the aircraft's systems and helps to identify and diagnose faults.
MCDU Title Line Role
- The title line on the MCDU display provides context by indicating the current page or function.
MCDU Data Lines Arrangement
- The MCDU Display features multiple data lines arranged in a specific order for easy navigation.
Scratchpad/Message Line Purpose
- The scratchpad or message line serves as a communication channel for the operator, conveying messages or instructions.
Data Line Font Size
- Data lines in the MCDU Display are typically smaller than label lines, providing clearer hierarchy for information.
Data Line Organization
- Data lines are arranged in a logical manner, often grouped by related information or function.
MCDU Display Component
- The CMC (Central Maintenance Computer) is NOT a direct part of the MCDU Display.
Scratchpad Message Indication
- The message on the scratchpad line indicates a fault, warning, or system status.
MCDU Display Design
- The MCDU Display is designed to simplify information retrieval and communication for the operator.
ACARS Meaning
- ACARS stands for Aircraft Communications Addressing and Reporting System.
Asterisk Indicator (A340)
- The asterisk next to the line select key in the A340 MCDU display indicates an active function or selection.
CMCS Report Function Distinction
- Different types of MCDUs offer varying levels of CMCS report functions, influencing the data accessible to operators.
PRINT Message Function
- The Airbus A340 MCDU allows for a PRINT message function.
Line Select Key Purpose
- Line select keys on the MCDU allow users to navigate and activate specific lines or functions on the display.
MCDU Role in ACARS
- The primary role of the MCDU in the ACARS data link is communication and data transfer.
MCDU Display During CMCS Report
- During the CMCS report function, the MCDU display shows detailed maintenance information, including fault details, system status, and troubleshooting guidelines.
ACARS Display on 747-400 MCDU
- The 747-400 MCDU features a dedicated "ACARS" line that clearly indicates the status and communication channels of the ACARS data link.
Fault Message Indication
- A fault message primarily indicates a detected anomaly, malfunction, or deviation within a system.
Fault Analysis Component
- The BITE (Built-In Test Equipment) is primarily responsible for analyzing faults in aircraft systems.
CMC Fault Storage
- The Central Maintenance Computer (CMC) stores fault information along with the fault type, time of occurrence, and potential causes.
Data Source Purpose
- The data source displayed on the MCDU page provides context and identifies the origin of the information presented.
Fault Message Format
- A standardized fault message typically includes the affected system, the specific fault, the time of occurrence, and potential troubleshooting steps.
SFCC Role
- The Slat Flap Control Computer (SFCC) plays a role in identifying and reporting faults related to its controlled system.
Fault Message Location
- After a fault is detected and analyzed, the fault message is typically located at the CMC (Central Maintenance Computer) for further action.
BITE Acronym (Fault Analysis)
- BITE stands for Built-In Test Equipment, a component that helps diagnose and analyze faults in aircraft systems.
Hard Failure Definition
- A hard failure in aircraft systems is a permanent malfunction that completely prevents a system from functioning.
Intermittent Failure Characteristics
- An intermittent failure is characterized by a sporadic or unpredictable occurrence, where a system may function normally at times but malfunction at others.
Hard Failure Characteristic
- A hard failure is NOT characterized by its intermittent nature, as hard failures imply a permanent malfunction.
Post Flight Report Exception
- A failure is likely to NOT be recorded in a post flight report if it is a minor anomaly, does not significantly impact flight safety, and is easily resolved during pre-flight checks.
Continuous Failure Type
- A hard failure typically occurs continuously without interruption, meaning the system is permanently malfunctioning.
Pilot Description of Intermittent Failure
- A pilot might describe an intermittent failure during flight as a "temporary glitch", "sporadic issue", or "intermittent malfunction".
Failure Requiring Troubleshooting
- Intermittent failures usually require a troubleshooting process to identify the underlying cause and ensure a permanent solution.
Hard vs. Intermittent Failure Distinction
- The primary distinction between hard and intermittent failures lies in their consistency and predictability. Hard failures are permanent, while intermittent failures are sporadic and unpredictable.
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Description
This quiz covers the On Board Maintenance System, focusing on the Central Maintenance Computer (CMC) and Built In Test Equipment (BITE). It explores how these systems communicate with aircraft systems, report faults, and generate maintenance data. Test your understanding of the key components and functionalities involved in aircraft maintenance operations.