MCDU/FMGS

Question 1

What are the main components of the FMGS?

Answer 1

• 2 FMGCs
• 2MCDU
• 1 FCU
• 2FAC

Question 2

What are the function of the FMGCs?

Answer 2

• flight guidance

- flight management

Question 3

What are the three (four on 535,536, A320, a 321) modes of operation?

Answer 3

• independent
• single
• dual
• back up mode

Question 4

What are two mode of flight guidance?

Answer 4

• managed guidance

- Selected guidance

Question 5

What is the managed of flight guidance used for?

Answer 5

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

Question 6

What is selected mode of flight guidance used for?

Answer 6

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

Question 7

Does selected or managed guidance have priority?

Answer 7

Selected guidance

Question 8

What does ACTIVATE/CONFIRM APPR phase do for the pilot?

Answer 8

• Allows thrust and speed target to follow a predetermined schedule, based on flap selection.
• if using managed speed, GS mini is available. If using selected speed, GS mini is not available.

Question 9

What type of database is periodically updated in the FMGS?

Answer 9

Navigation database

Question 10

Can the crew modify data in the navigation database?

Answer 10

The crew has limited ability to create stored navigation data.

Question 11

How would the flight crew determine the validity of the navigation database?

Answer 11

On the A/C status page

Question 12

What input does each FMGC normally use for position determination?

Answer 12

A hybrid IRS/GPS position.

Question 13

What is normal operational mode of the FMGS logic?

Answer 13

Dual mode, with one FMGS as the master and the other FMGS as slave.

Question 14

How does autopilot selection influence master FMGS logic?

Answer 14

• if one autopilot is engaged, the respective FMGS is master.
• if both autopilots are engaged, FMGS 1 will be the master
• if no autopilot is engaged FMGS 1 is the master

Question 15

If an Amber OFF SIDE FM CONTROL message is displayed on the ND what action should the crew take?

Answer 15

An FMGS has failed and both NDs must be set to the same mode and range. The full procedure can be found in the COM.

Question 16

In cruise flight with AP1 engaged, what would happen if AP2 was selected?

Answer 16

The AP2 would take over, and AP1 would disengage. It is only possible to engage both autopilots in the approach phase after selection of the APPR pushbutton.

Question 17

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

Answer 17

Large- pilot entries and modified data

Small- default or computed, non- modifiable data

Question 18

If the LFEX TEMP is not entered on the TAKEOFF page of the MCDU, and the thrust levers are positioned in the FLEX detent, what will occur and what should be done?

Answer 18

• A warning will be generated

- thrust levers should be moved into TOGA detent and a max thrust takeoff should be accomplished

Question 19

Where would a pilot enter the zero fuel weight?

Answer 19

INIT B page

Question 20

What do amber box prompts on the MCDU indicate?

Answer 20

An entry is mandatory

Question 21

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

Answer 21

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