MCDU/Flight Management Guidance System Flashcards
What are the main components of the FMGS?
2 FMGCs
2 MCDUs
1 FCU (two independent channels)
2 FACs
What are the functions of the Flight Management Guidance Computers?
Flight Guidance
Flight Management
What are the 3 modes of FMGC operation?
Independent (MCDU scratchpad displays – INDEPENDENT OPERATION)
Single (ND displays - SELECT OFFSIDE RNG/MODE)
Dual (Normal)
What are the 2 modes of flight guidance?
Managed Guidance
Selected Guidance
What is the Managed mode of flight guidance used for?
Long-term Lateral, vertical , and speed profiles as determined by the FMGS
What is the 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 always has priority
How do you determine the validity of the navigation database?
On the Aircraft Status page via the MCDU
What input does each FMGC use for position determination?
A hybrid (“mix”) IRS/GPS position
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 an amber SELECT OFFSIDE RNG/MODE 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 (single mode)
Can both autopilots be engaged during any phase of flight?
No, only during an ILS approach
What is the difference between the large and small fonts utilized in the MCDU?
Large – Pilot entries and modifiable data
Small – Default/computed non-modifiable data
When would a Takeoff Shift be entered on the PERF TO page?
When takeoff begins at a runway intersection and GPS is not primary
Where do you enter the Zero Fuel Weight?
An entry is mandatory
