MCDU/FLIGHT MANAGEMENT GUIDANCE SYSTEM Flashcards
What are the main components of the FMGS?
- 2 FMGC’s
- 2 MCDU’s
- 1 FCU
- 2 FAC’s
What are the functions of the Flight Management Guidance Computers?
- Flight Guidance
* Flight Management
What are the 3 modes of FMGC operation?
- Independent
- Single
- Dual
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
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 pilot stored navigational data
How do you determine the validity of the navigation database?
On the Aircraft Status page
What input does each FMGC use for position determination?
A hybrid IRS/GPS position
What is the normal operational mode of the FMGS?
Dual mode, with one FMGS as 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 an amber OFF SIDE FM CONTROL message is displayed on the ND what action should the crew take?
An FMGS has failed and both ND’s must be set to the same mode and range
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?
If take off begins at a runway intersection and GPS PRIMARY is lost
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?
- A warning will be generated
* Continue to move the thrust levers to the TOGA detent and execute a max thrust takeoff
Where do you 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
