26. MCDU/FMGS (Auto Flight) [B] Flashcards
What are the two 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 does ACTIVATE/CONFIRM APPR phase do for the pilot if in managed speed?
• Allows autothrust and speed target to follow a predetermined schedule, based on flap selection:
o F0 = green dot
o F1 = S speed
o F2 = F speed
oF3 = F speed or V APP (depending on landing flap selection)
o Full = VAPP
• If using managed speed, GS MINI is available. If using selected speed, GSMINI is not available
What happens if the pilots forget to ACTIVATE/ CONFIRM the APPR phase while in the descent phase?
Once you manage speed, the autothrust system will target 250 kts below 10,000 ft
What time of day would a pilot have to switch to a new Navigation Database?
0901z
Can the crew modify data in the navigation database?
The crew has limited ability to create pilot stored navigational data.
How would a 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 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 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 takeover, and AP1 would disengage. It is only possible to engage both autopilots in the approach phase after selection of the APPR pushbutton while conducting a ILS approach
What is the difference between the large and small fonts utilized in the MCDU?
• Large – Pilot entries and modifiable data
• Small – Default or computed, non-modifiable data
