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module 5b > 5.15 Electronic/Digital Aircraft Systems > Flashcards

5.15 Electronic/Digital Aircraft Systems Flashcards

1
Q

What are your common display types on aircraft?

A

CRT, LED and LCD’s

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2
Q

In an aircraft fitted with CRT what controls the image painted on the screen?

A

Symbol Generator providing analogue, digital and discrete signals.

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3
Q

How do the symbol generators operate?

A

They are connected to the digital data bus and receive digitized signals which are then transmitted to the electronic displays to drive electron guns to paint the picture.

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4
Q

What is the center of each electronic display system?

A

Symbol generators.

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5
Q

Within the EFIS system what is the purpose of the 3rd symbol generator?

A

Drives signals can be switched to either the captain or first officer units in the event of THEIR primary symbol generator failing.

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6
Q

Where are ECAM displays typically located?

A

In the center of the instrument panel.

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7
Q

Which system does this diagram belong to?

A

ECAM - Airbus

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8
Q

The EICAS system does not incorporate separate symbol generators, this function is performed by?

A

EICAS Computers

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9
Q

Which system does this diagram belong to?

A

EICAS - Boeing

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10
Q

On an EICAS system during normal flight the lower display will be?

A

Blank

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11
Q

Explain EICAS system operation

A

Only 1 computer operates at anyone time, the other is for redundancy and remains in ‘standby’ ready to take over automatically.

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12
Q

BITE systems provide information on?

A
  1. Detecting indicating faults
  2. Monitors equipment performance
    3.Detecting operation problems
    4.Fauly sensors
    5.Storing fault data
    6.Operational verification after defect repair.
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13
Q

What is ACARS in relation to BITE

A

transmit data while the aircraft is in flight to the maintenance facility.

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14
Q

What types of test programs does the BITE system test?

A

Operational test and Maintenance test.

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15
Q

What can the watchdog routine check for?

A

Hardware failure or excessive signal distortion that may create operational failure.

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16
Q

If the watchdog detects a hardware failure or signal failure what happens?

A

Automatically provides isolation of the component, initiates warning caution, advisory data and records the fault in a non-volatile memory!

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17
Q

During normal operation of the BITE system it monitors what?

A

A watchdog signal initiated by the bite program.

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18
Q

After a system has been repaired the BITE system should do what?

A

Should be reset and an operational check performed, the repaired system should be run through a complete cycle of operation.

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19
Q

In order to carry out a BITE test on an EICAS system what conditions must be met?

A

Aircraft must be on the ground and parking brake set.

20
Q

What is the MCDU used to monitor and test?

A
  1. Flight control computer FCC
  2. Flight Management Computers FMC
  3. Thrust Management Computers TMC
  4. EICAS
21
Q

The components of the ACARS system are the Management Unit MU, The Control Unit and the Printer. What is the function of the MU?

A

MU Controls transmission of air to ground messages and receives digital messages through VHF transceiver

22
Q

What is the main component in the ECAM system?

A

Flight warning computer

23
Q

Under Normal operation of the FWC in an ECAM what happens?

A

Output to only one symbol generator at a time.

24
Q

How many symbol generators does an ECAM system have?

A

2

25
Q

Which system does this diagram belong to?

A

EFIS

26
Q

The PFD Primary flight display combines the information provided by?

A

An EADI and an EHSI onto one CRT

27
Q

What information is displayed on a PFD?

A

Altitude/Airspeed/Vertical Speed. (Primary Data)

28
Q

What information does the MFD/ND display?

A

lateral navigation/compass, radar, TCAS, flight management, diagnostic information, It also provides as a back up system of the PFD

29
Q

In conjunction with the Central Maintenance Computers (CMC) the EICAS system monitors?

A

All aircraft systems to ensure no failures, records all faults for later investigation.

30
Q

What does the upper display of an EICAS system display?

A

Primary engine indicators, crew alert messages, flaps and landing gear status, fuel qty etc.

31
Q

Describe EICAS system operation.

A

Only one computer operates at a time, the other is for redundancy and remains in standby ready to takeover automatically.

32
Q

Fault monitoring of the EICAS system monitors incoming digital data for?

A

Validity using the ARINC 429 parity but, and all input data.

33
Q

Fly by wire each have what per system?

A

Different processors, different manufacturers, segregation of data buses, each computer has own power supply. All for redundancy.

34
Q

What is the flight management system used for?

A

Reduce the crew workload.

35
Q

The FMC is in effect the master computer which integrates systems such as nav, flight, thrust, air data it also has capabilities of?

A

Controlling the aircraft just after take off through to rollout on the runway after landing.

36
Q

What is used for data entry into the FMC flight managment computer?

A

CDU

37
Q

How many FMC’s are fitted per aircraft?

A

1,2 or 3 depending on the allocated crew position.

38
Q

What is the purpose of the CDU of the FMS?

A

Allow access to fault data and control of FMC

39
Q

The GPS data is provided to?

A

The FMS where it can then be processed for nav, inertial nav, auto flight.

40
Q

What does the IRC provide?

A

Complex nav, attitude and velocity data. used in conjunction with total auto flight system.

41
Q

What is the Inertial Reference System made up of?

A

3 Laser Gyro’s and 3 Accelerometers.

42
Q

The IRS requires what sort of power supply?

A

Uninterruptible power supply to maintain full operational status, fitted with Own battery or automatically switches to main aircraft battery.

43
Q

What is the purpose of the TCAS system?

A

To advise the crew of other aircraft within their vicinity, it can provide instructions to climb or descend.

44
Q

How does the TCAS operate?

A

Independently of ground based installations and creates a zone around the aircraft which it monitors for intrusions.

45
Q

What are the 2 warnings of the TCAS system and what do they do?

A

Traffic Advisory TA - Informs flight crew of distance and bearing of aircraft which are possible threats.
Resolution Advisory RA - Visual and Aural instructions to the flight crew to ascend or descend.

46
Q

The system uses the ATC Transponder to monitor?

A

Altitude bearing and rate of closure of other aircraft intruding into its zone.

47
Q

How does the TCAS operate?

A

Independently of ground based installations and creates a zone around the aircraft which it monitors for intrusions.

module 5b (3 decks)

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