11.18 On Board Maintenance Systems Flashcards by Dylan Sinclair

What method is used in older generation aircraft to test each system?
A) OBMS menu selection
B) Wireless diagnostic interface
C) Individual switch on flight deck or system computer

C) Individual switch on flight deck or system computer

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What is the main purpose of an On Board Maintenance System (OBMS)?
A) To perform engine start-up sequences
B) To monitor, record, and report aircraft system faults
C) To replace physical circuit boards in avionics systems

B) To monitor, record, and report aircraft system faults

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Which aircraft system allows engineers to test and troubleshoot systems both in-flight and on the ground?
A) CMC
B) OBMS
C) ACARS

B) OBMS

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What are the main components of a Central Maintenance System (CMS)?
A) Data bus and MAT terminal
B) Multi-purpose relays and fuse panels
C) Central Maintenance Computers and MCDUs

C) Central Maintenance Computers and MCDUs

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What is the role of a Central Maintenance Computer (CMC)?
A) Stores fuel consumption data only
B) Processes inputs and outputs for system monitoring
C) Controls cabin lighting functions

B) Processes inputs and outputs for system monitoring

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How many fault codes can a CMC typically generate?
A) 100
B) 1000
C) 10,000

C) 10,000

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What function does a ‘crosstalk’ feature provide in dual CMC setups?
A) Allows data printing in the avionics bay
B) Enables two CMCs to share and monitor faults
C) Transfers flight data to the MCDU screen

B) Enables two CMCs to share and monitor faults

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What type of converter is needed for a CMC to activate a warning LED?
A) A/D Converter
B) D/A Converter
C) Power supply unit

B) D/A Converter

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Which is the highest fault classification recorded by the CMS?
A) Level C
B) Level A
C) Level B

B) Level A

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Which Airbus fault classification is not displayed to the flight crew but is recorded for engineers?
A) Class 1
B) Class 2
C) Class 3

C) Class 3

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What type of failure results in immediate performance changes in a system?
A) Soft failure
B) Maintenance memo
C) Hard failure

C) Hard failure

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What is the purpose of Built-In Test Equipment (BITE)?
A) To calculate aircraft speed
B) To detect, accommodate, and log faults
C) To replace outdated software

B) To detect, accommodate, and log faults

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Which type of BITE is automatically run during the system’s power-up sequence?
A) Manual BITE
B) Power Up BITE
C) Component Level BITE

B) Power Up BITE

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What is the function of the Multifunction Control Display Unit (MCDU)?
A) Display engine RPM data
B) Allow engineers to initiate tests and view faults
C) Print maintenance logs

B) Allow engineers to initiate tests and view faults

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Which function on the CDU provides access to fault history stored in non-volatile memory?
A) Present leg faults
B) Confidence tests
C) Fault history

C) Fault history

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What is the main function of a data loading system in aircraft maintenance?
A) Monitoring flight paths
B) Updating software and retrieving system data
C) Controlling cabin pressure

B) Updating software and retrieving system data

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Which of the following is NOT a method of bringing data onto an aircraft?
A) Pen-drive
B) Satellite uplink
C) Maintenance laptop

B) Satellite uplink

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In which mode does the Disc Drive Unit allow both viewing and downloading of data?
A) Manual mode
B) Configuration mode
C) Automatic mode

C) Automatic mode

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What type of disc does the MDDU use for data loading?
A) 5.25-inch single-sided disc
B) 3.5-inch double-face high-density disc
C) 4.7 GB DVD

B) 3.5-inch double-face high-density disc

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What format must the disc used in an MDDU be in?
A) NTFS
B) Linux EXT3
C) MS-DOS

C) MS-DOS

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Where is the software stored onboard for aircraft computers?
A) USB flash drives
B) Data repository or file server
C) Control Display Unit

B) Data repository or file server

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What is the typical capacity of a software repository on an aircraft?
A) 1 GB
B) 10 GB
C) 100 GB

B) 10 GB

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Which system is used by Airbus for data loading and configuration?
A) Core Network
B) CIS
C) DLCS

C) DLCS

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Which application is used on a maintenance laptop to manually stage software?
A) CIS
B) SMT
C) CMC

B) SMT

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What must be done to enable Onboard Data Load Function (ODLF)? A) Press the Flight Deck Reset Button B) Switch the Ground Test Switch to the Data Load Enable position C) Restart the aircraft network

B) Switch the Ground Test Switch to the Data Load Enable position

Which of the following is a sub-function of the Central Maintenance Computer (CMC)? A) Aircraft painting scheduling B) Repository management C) Fuel load estimation

B) Repository management

Which interface device is NOT typically used for controlling DLCS? A) PMAT B) Flight Attendant Panel C) Radar Altimeter

C) Radar Altimeter

What type of interface does an LRU with advanced connectivity use? A) USB B) AFDX C) HDMI

B) AFDX

What does the EXTENDED MAINTENANCE menu on the MAT allow access to? A) In-flight entertainment controls B) Weather data updates C) Software part number management

C) Software part number management

In the system configuration dialog box, what is listed for each LRU or LRM? A) Software configuration only B) Only the serial number C) Hardware and software part numbers

C) Hardware and software part numbers

What is the main purpose of the Electronic Library System (ELS)? A) To provide aircraft weight and balance calculations B) To provide timely access to operational and maintenance information C) To control the aircraft’s flight management system

B) To provide timely access to operational and maintenance information

Which of the following is a benefit of the ELS for maintenance personnel? A) Real-time weather updates B) Combined access to OMS in an integrated fault-reporting environment C) Improved aircraft handling during taxi

B) Combined access to OMS in an integrated fault-reporting environment

What type of display is typically used in a basic ELS architecture? A) OLED B) CRT C) Monochromatic active-matrix LCD

C) Monochromatic active-matrix LCD

Which of the following is NOT listed as a manual included in the ELS? A) Quick Reference Handbook (QRH) B) Electronic Checklists C) Flight Data Recorder Manual

C) Flight Data Recorder Manual

How does a flight crew interact with the ELS display? A) Using a joystick B) Through a capacitive touch screen overlay C) By voice command only

B) Through a capacitive touch screen overlay

What is the purpose of the soft keyboard function in ELS systems? A) To increase screen brightness B) To allow direct text entry C) To control aircraft autopilot

B) To allow direct text entry

What is an Electronic Flight Bag (EFB) primarily used for? A) Engine performance tuning B) Reducing or replacing paper-based reference materials C) Managing in-flight entertainment

B) Reducing or replacing paper-based reference materials

Which of the following is NOT a hardware class of an EFB? A) Class 1 B) Class 2 C) Class 4

C) Class 4

What additional functionalities can EFB systems provide beyond onboard library access? A) Live television streaming B) Access to OMS, ODL, and OSM C) Passenger meal ordering

B) Access to OMS, ODL, and OSM

What are the software types hosted on an EFB? A) Alpha, Beta, Gamma B) A, B, C C) X, Y, Z

B) A, B, C

Where is the flight compartment printer typically located? A) In the avionics bay B) In the cabin ceiling panel C) At the rear of the centre pedestal or under the interphone handset

C) At the rear of the centre pedestal or under the interphone handset

How many printers can some aircraft types have in the flight deck? A) One shared printer B) Two printers with dedicated functions C) Three printers with redundant backups

B) Two printers with dedicated functions

Which of the following systems can send data to the flight deck printer? A) Auxiliary Power Unit Control System B) Passenger Entertainment System C) Central Maintenance Computer System (CMCS)

C) Central Maintenance Computer System (CMCS)

What is the function of the green MSG LED on the printer? A) It indicates low paper supply B) It turns on when a message is received C) It shows that the printer is powered on

B) It turns on when a message is received

What causes the amber FAULT LED to turn on? A) Paper has been replaced B) The MSG LED is reset C) A self-test fails, the front door is opened, or the printer is out of paper

C) A self-test fails, the front door is opened, or the printer is out of paper

What does the REPT switch on the printer do? A) Rewinds the last message B) Prints out the last printed message again C) Resets all printer settings

B) Prints out the last printed message again

What does the TEST switch on the printer do? A) Starts a self-test and prints a test pattern if successful B) Clears all memory C) Sends a test message to the CMC

A) Starts a self-test and prints a test pattern if successful

What kind of paper does the flight deck printer use? A) Sheets of A4 paper B) Roll paper fed under a paper bar C) Carbon copy paper

B) Roll paper fed under a paper bar

Which of the following can send a print command to the flight deck printer? A) Passenger seat control B) Overhead stowage bin C) Maintenance laptop

C) Maintenance laptop

What does the paper indicator on the printer show? A) Printer temperature B) Amount of paper remaining C) Number of printed messages

B) Amount of paper remaining

What is the main objective of damage tolerance in aircraft structures? A) To prevent all forms of structural damage entirely B) To allow structures to continue flying indefinitely with damage C) To sustain damage without catastrophic failure until repair or replacement

C) To sustain damage without catastrophic failure until repair or replacement

Which of the following is NOT listed as a type of structural damage? A) Thermal distortion B) Delamination C) Water ingress

A) Thermal distortion

What design philosophy did damage tolerance improve upon in the 1970s? A) Safe-life design B) Fail-safe principle C) Zero-defect manufacturing

B) Fail-safe principle

What is a key element of the damage tolerance approach? A) Increasing material thickness B) Using only composite materials C) Scheduled inspections to detect cracks

C) Scheduled inspections to detect cracks

What does Structural Health Monitoring (SHM) involve? A) Visual inspection by engineers B) Removal of structure for testing C) Non-destructive testing with integrated sensors

C) Non-destructive testing with integrated sensors

One benefit of SHM is that it: A) Requires aircraft to be grounded for testing B) Increases structural conservatism C) Helps reduce weight and maintenance costs

C) Helps reduce weight and maintenance costs

What typically increases as an aircraft ages? A) Structural redundancy B) Visibility of fatigue signs C) Airspeed limitations

B) Visibility of fatigue signs

Fatigue meters are usually mounted: A) In the aircraft nose B) On each wingtip C) Close to the centre of gravity

C) Close to the centre of gravity

What do strain gauges measure? A) Temperature variation B) Material corrosion C) Deformation due to stress

C) Deformation due to stress

In a strain gauge Wheatstone bridge, what is the role of resistor R4? A) To increase resistance when under tension B) To cause bridge imbalance C) To compensate for temperature changes

C) To compensate for temperature changes

What happens when R2 in the Wheatstone bridge is under tension? A) Its resistance decreases B) It creates balance in the bridge C) A potential difference occurs across the bridge

C) A potential difference occurs across the bridge

Intelligent skins detect damage by: A) Sensing changes in electrical current B) Measuring G-forces C) Monitoring changes in light transmission in optical fibres

C) Monitoring changes in light transmission in optical fibres

Intelligent skins are typically used with: A) Steel structures B) Composite materials C) Hydraulic systems

B) Composite materials

Which main menu tab on a MAT finds the data load functionality A) Line maintenance B) Extended maintenance C) Other functions

B) Extended maintenance

Which gives access to the CMC? A) The MCDU ( Multipurpose control display unit), MAT ( Maintenance access terminal) or OMT ( Onboard maintenance terminal) B) The MFD ( multi function display) C) The maintenance control office

A) The MCDU ( Multipurpose control display unit), MAT ( Maintenance access terminal) or OMT ( Onboard maintenance terminal)

Which system relays aircraft maintenance data to the ground? A) ACARS ( aircraft communications addressing and reporting system) using VHF B) The CMC ( central maintenance computer) itself The FMS ( flight management system)

A) ACARS ( aircraft communications addressing and reporting system) using VHF

11.18 On Board Maintenance Systems Flashcards

(66 cards)