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M11 Consolidation > 11.18 OBMS > Flashcards

11.18 OBMS Flashcards

1
Q

What does the CMCS consist of?

A
  • 1 or 2 CMCs
  • 2 or 3 MCDU’s
  • Datalink to acars
  • Computer in each aircraft system
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2
Q

What are the 2 modes of operation for CMCS?

A

Reporting and Interactive

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3
Q

When can interactive mode be used?

A

AC on ground

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4
Q

What are the two functions of bite?

A
  • Detect failures

- Perform tests on ground

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5
Q

When is bite carried out automatically?

A

Power on

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6
Q

How is CMCs redundancy achieved?

A

Second standby CMC

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7
Q

How is the standby CMC switched in?

A

Automatically in case of failure

- manually on some aircraft

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8
Q

How is redundancy fulfilled in interactive mode?

A

backup channel

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9
Q

What is MCDU used mainly for in flight?

A

Controlling FMS

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10
Q

What does the “fail” annunciators on the MCDU indicate?

A

MCDU is defective, use another one

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11
Q

How many lines and characters make up the MCDU display screen?

A

14 lines, each containing 24 characters

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12
Q

What is the top line of the MCDU called?

A

Title line

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13
Q

What is the bottom line of the MCDU called?

A

Scratchpad or message line

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14
Q

When using MCDU, when might the “no response” message be shown?

A

If there is a printer failure, out of paper, or in use by another system

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15
Q

How is the “no response” indication, indicated on airbus?

A

by an asterisk

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16
Q

How could you confirm that a recorded fault is the cause of a “cockpit effect”?

A

Correlation of time, date and ATA chapter

17
Q

When does memorisation of faults begin?

A

Beginning of flight, 3 mins after engine start

18
Q

When does the memorisation of faults end?

A

Flight is terminated during taxiing

19
Q

How is an intermittent failure defined?

A

Occurs once or several times during flight but isn’t reported after landing

20
Q

What happens to the last flight data at the beginning of the next flight?

A

Moved into history memory

21
Q

How many previous flights is the fault history data retained for?

A

63

22
Q

On the ground when is reporting mode terminated?

A

When interactive mode is selected

23
Q

What are 2 main purposes of different test functions on CMC?

A
  • Confirm most likely reported LRU is faulty

- Confirm component repair or removal solved problem

24
Q

What three tests can be carried out?

A
  • System

- complementary and output

25
Q

Why arent tests allowed during flight?

A

In case flight safety is influenced

26
Q

How can tests be enabled manually?

A

ground test enable switch

27
Q

What happens to the system with the ground test enable switch in the normal position?

A

all test signals are interrupted

28
Q

What special precautions are needed for a system test?

A

None, it is only a computer test of the system

29
Q

Which test requires preconditions?

A

complementary test

30
Q

What is displayed when you carry out a complementary test?

A
  • Caution message

- moving surfaces

31
Q

Why is the final selection of the complementary test a different line select key than the previous page?

A

To ensure the operator is fully aware of what is going to happen

32
Q

What is necessary at the end of the complementary test?

A

A close up, to bring AC back to original condition

33
Q

What is the main purpose of the output test?

A

To trigger a cockpit function for the operator to monitor

34
Q

How is a successful output test indicated?

A

It isn’t, it is determined by the operator dependent on the indicator response

35
Q

How often must the FMS nav database update be updated?

A

28 days

36
Q

How can data loading be carried out?

A
  • Airborne data loader
  • Portable data loader
  • Cross loading between computers
37
Q

When does the FMC data loading page appear automatically?

A

When 2 FMC’s detect different part numbers at power on

M11 Consolidation (18 decks)

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