MCDU/FMGS Flashcards
What are the main components of the FMGS?
- 2 FMGCs
- 2MCDU
- 1 FCU
- 2FAC
What are the function of the FMGCs?
- flight guidance
- flight management
What are the three (four on 535,536, A320, a 321) modes of operation?
- independent
- single
- dual
- back up mode
What are two mode of flight guidance?
- managed guidance
- Selected guidance
What is the managed of flight guidance used for?
Long-term lateral, vertical, and speed profiles as determined by the FMGS
What is selected mode of flight guidance used for?
Temporary lateral, vertical, and speed commands as selected with the FCU.
Does selected or managed guidance have priority?
Selected guidance
What does ACTIVATE/CONFIRM APPR phase do for the pilot?
- 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.
What type of database is periodically updated in the FMGS?
Navigation database
Can the crew modify data in the navigation database?
The crew has limited ability to create stored navigation data.
How would the flight crew determine the validity of the navigation database?
On the A/C status page
What input does each FMGC normally use for position determination?
A hybrid IRS/GPS position.
What is normal operational mode of the FMGS logic?
Dual mode, with one FMGS as the master and the other FMGS as slave.
How does autopilot selection influence master FMGS logic?
- 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
If an Amber OFF SIDE FM CONTROL message is displayed on the ND what action should the crew take?
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.
In cruise flight with AP1 engaged, what would happen if AP2 was selected?
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.
What is the difference between the large and small fonts utilized in the MCDU?
Large- pilot entries and modified data
Small- default or computed, non- modifiable data
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?
- A warning will be generated
- thrust levers should be moved into TOGA detent and a max thrust takeoff should be accomplished
Where would a pilot enter the zero fuel weight?
INIT B page
What do amber box prompts on the MCDU indicate?
An entry is mandatory
What occurs when managed NAV mode is engaged and the aircraft flies into a flight plan discontinuity?
NAV mode will be lost and the HDG/TRK mode engages.
