MCDU/FMGS

Question 1

What are the main components of the FMGS?

Answer 1

- 2 FMGCs
- 2 MCDUs
-  1FCU
- 2FACs

Question 2

What are the functions of the FMGCs?

Answer 2

•  Flight guidance

-  Flight management

Question 3

What are the three modes of FMGC operation?

Answer 3

- Independent

•  Single
•  Dual

Question 4

What are the two modes of flight guidance?

Answer 4

•  Managed guidance

-  Selected guidance

Question 5

What is the managed mode of flight guidance used for?

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?

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:
  - F0 = green dot
  - F1=Sspeed
  - F2=Fspeed
  - F3 = F speed or VAPP (depending on landing flap selection)
  - F4 = VAPP
•  If using managed speed, GSMINI is available. If using selected speed, GSMINI 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 pilot stored navigational data.

Question 11

How would a 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 the normal operational mode of the FMGS?

Answer 13

 Dual mode, with one FMGS as 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 takeover, 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 modifiable data

-  Small – Default or computed, non-modifiable data

Question 18

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

Answer 18

 When takeoff begins at a runway intersection with NO GPS PRIMARY

Question 19

If the FLEX 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 19

- A warning will be generated
- Thrust levers should me moved into the TOGA detent and a max thrust
takeoff should be accomplished.

Question 20

Where would a pilot enter the Zero Fuel Weight?

Answer 20

 INIT B page

Question 21

What do amber box prompts on the MCDU indicate?

Answer 21

 An entry is mandatory.

Question 22

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

Answer 22

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