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Cat B- Mod 11 Aircraft Systems > 11.18 On Board Maintenance System > Flashcards

11.18 On Board Maintenance System Flashcards

1
Q

What is the purpose of OBMS?

A

To monitor and test the aircraft systems, to record and store the fault data, and to provide information about these faults to the flight crew and the engineer.

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2
Q

What is CMS?

A

Central maintenance systems

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3
Q

What is the primary purpose of the CMS?

A

monitor the fault status of aircraft systems, initiate aircraft system tests, generate fault reports from previous flight legs

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4
Q

What does a CMS consist of?

A

1 or 2 CMC’s
2 or 3 MCDU

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5
Q

What is the CMC?

A

Central maintenance computer, brains of the CMS

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6
Q

How many faults can be stored in the Non-Volatile memory?

A

500 faults

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7
Q

What classifications of faults does the CMS use?

A

Level A (Warning)
Level B (Cautions)
Level C (Advisory)

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8
Q

What is a hard failure?

A

Performance change of the system caused by a failure

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9
Q

What is a soft failure?

A

Failure that causes no immediate performance changes.

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10
Q

What is a maintenance memo?

A

lowest levels of indicated failure.

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11
Q

How are individual BITE systems connected to the CMC?

A

A digital bus either ARINC 429 or 629

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12
Q

What is an interruptive or manual BITE?

A

One where it must be started by crew.

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13
Q

What does MCDU stand for?

A

Multifunction Control Display Units

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14
Q

On the MCDU menu, what is found on page 1?

A

Support line maintenance and turn arounds. Page 2 is extended maint and troubleshooting

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15
Q

What is ACARS?

A

Aircraft Communications Addressing and Reporting System

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16
Q

What does ACARS do?

A

Sends faults reports back to operator.

17
Q

What two modes does a disc drive unit operate in?

A

Automatic mode
Manual Mode

18
Q

What can be done in automatic mode of a disc drive?

A

Both view and download

19
Q

What format is the disc in a MDDU?

A

MS-Dos

20
Q

What four sub-functions does the CMC have?

A

Data loading
Aircraft config monitoring
Repository management
Software pin

21
Q

What is software pin programming?

A

Shows and makes the modification of aircraft computers configuration

22
Q

What does the DLCS application do?

A

Stores and retrieves software to/from the repository.

23
Q

What is a HMI?

A

principally an Airbus term where other manufacturers simply refer to the interface device in hand.

24
Q

What two types of pin programming are there?

A

Hard
Soft

25
Q

What is the ELS?

A

Electronic Library System

26
Q

What is a class 1 EFB?

A

such as laptops or handheld electronic devices, such as iPads.

27
Q

What is a class 2 EFB?

A

Class 2 are like Class 1 EFBs, but they are mounted on the aircraft and have electronic links to aircraft systems.

28
Q

What is a class 3 EFB?

A

“installed equipment” and subject to airworthiness requirements

29
Q

What is type A software?

A

static applications, such as document viewers

30
Q

What is type B software?

A

electronic approach charts that are static or those that require panning, zooming, or scrolling.

31
Q

What is type c software?

A

Multifunction Display (MFD); it has also been used to form part of an Automatic Dependent Surveillance-Broadcast system.

32
Q

What are type c applications subject too?

A

Airworthiness directives

33
Q

How are the inputs to the printer prioritised?

A

ACARS highest
ACMS
CMCS lowest

34
Q

What can SHM facilitate?

A

40% reduction in maintenance cost

35
Q

What are fatigue meters used for?

A

Used to record overall, accumulated stress levels on aircraft.

36
Q

What are strain gauges used for?

A

to monitor stress levels on specific aircraft structures.

37
Q

What are intelligent skins?

A

constructed with fibre optic sensors embedded in the material which are connected to signal processing units.

Cat B- Mod 11 Aircraft Systems (28 decks)

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