MCDU / FMGS - Rev 04

Question 1

What are the main components of the FMGS?

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Answer 1

a. 2 FMGCs

b. 2 MCDUs

c. 1 FCU (two independent channels)

d. 2 FACs

Question 2

What are the functions of the Flight Management Guidance Computers?

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Answer 2

a. Flight Guidance

b. Flight Management

Question 3

What are the 3 modes of FMGC operation?

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Answer 3

a. Independent (MCDU scratchpad displays – INDEPENDENT OPERATION)

b. Single (ND displays - SELECT OFFSIDE RNG/MODE)

c. Dual (Normal)

Question 4

What are the 2 modes of flight guidance?

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Answer 4

a. Managed Guidance

b. Selected Guidance

Question 5

What is the Managed mode of flight guidance used for?

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Answer 5

Long-term lateral, vertical, and speed profiles as determined by the FMGS

Question 6

What is the Selected mode of flight guidance used for?

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Answer 6

Temporary lateral, vertical, and speed commands as selected with the FCU

Question 7

Does Selected or Managed Guidance have priority?

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Answer 7

Selected Guidance always has priority

Question 8

How do you determine the validity of the navigation database?

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Answer 8

On the Aircraft Status page via the MCDU

Question 9

What input does each FMGC use for position determination?

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Answer 9

A hybrid (‘mix”) IRS/GPS position

Question 10

How does autopilot selection influence master FMGS logic?

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Answer 10

a. If one autopilot is engaged, the respective FMGS is master

b. If both autopilots are engaged, FMGS 1 will be the master

Question 11

If an amber SELECT OFFSIDE RNG/MODE message is displayed on the ND what action should the crew take?

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Answer 11

An FMGS has failed and both NDs must be set to the same mode and range (single mode)

Question 12

Can both autopilots be engaged during any phase of flight?

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Answer 12

No, only during an ILS approach

Question 13

What is the difference between the large and small fonts utilized in the MCDU?

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Answer 13

Large – Pilot entries and modifiable data

Small – Default/computed non-modifiable data

Question 14

When would a Takeoff Shift be entered on the PERF TO page?

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Answer 14

When takeoff begins at a runway intersection and GPS is not primary

Question 15

Where do you enter the Zero Fuel Weight?

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Answer 15

INIT B page

(not accessible after engine start)

Question 16

What do amber box prompts on the MCDU indicate?

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Answer 16

An entry is mandatory

Question 17

What occurs when managed NAV mode is engaged and the aircraft flies into a flight plan discontinuity?

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Answer 17

NAV mode will be lost and the HDG/TRK mode engages