Flight Management/Guidance Flashcards
(47 cards)
How can you interface with the FMGC?
Via the:
FCU
Thrust lever
MCDU
How many FMGS modes?
4 modes:
DUAL
INDEPENDENT
SINGLE
BACKUP
What does DUAL mode mean?
Normal mode
The 2 FMGCs are synchronised.
Each performs its own computations and exchanges data through a crosstalk bus.
With AP1 engaged which FMGC is master?
FMGC 1 is master
With AP2 engaged which FMGC is master?
FMGC 2 is master
In DUAL MODE, with both APs engaged which FMGC is master?
FMGC 1 is master
In DUAL MODE, with NO AP/FD engaged which FMGC controls the A/THR?
FMGC 1
What is FMGC independent mode
Both FMCGs work independently and linked only to their onside peripherals
If the FMGC is in independent mode how do you know?
INDEPENDENT OPERATION message displayed on both MCDU scratchpads, IND annunciation on top of the MCDU.
What is FMCG single mode?
Only 1 FMCG is operational due to a failure
In FMCG single mode how do the FDs, FMCGs and MCDUs interact?
Both FDs are driven by the same FMCG. Any entry on either MCDU is sent to the operative FMGC.
If in FMGC SINGLE MODE what message will display on the ND associated with the failure if the NDs are NOT in the same mode or range.
“MAP NOT AVAIL” and
“SET OFFSIDE RNG/MODE”
If in FMGC SINGLE MODE what message will display on the ND associated with the failure if the NDs ARE in the same mode or range.
“OFFSIDE FM CONTROL”
Does the backup NAV mode auto select on the FMGC?
NO
Flight crew must select from the MCDU menu
How do you know an FMCG has failed?
The MCDU associated with the failure reverts to MCDU MENU page.
Associated FM1/FM2 light on MCDU indicates which has failed
What message appears when actual NAV accuracy drops below required NAV accuracy?
“NAV ACCUR DOWNGRAD”
on ND and MCDU scratchpad in AMBER
What message appears when actual NAV accuracy increases above required NAV accuracy?
NAV ACCUR UPGRAD”
on ND and MCDU scratchpad in WHITE
What do the colours AMBER, GREEN and BLUE mean in the FMGC?
AMBER - required for normal operation
GREEN - CAN’T be changed
BLUE - CAN be changed
How many phases of flight does the MCDU have?
8
PRE-FLIGHT
TAKE OFF
CLIMB
CRUISE
DESCENT
APPROACH
GO-AROUND
DONE
MAGENTA circle around a waypoint
Managed and ALT CSTR is predicted to be MET
WHITE circle around a waypoint
NAV engaged but ALT CSTR not taken account by FMGS
AMBER circle around a waypoint
Managed and ALT CSTR is predicted to be MISSED
BLUE or WHITE zig zag arrow
Descent path intercept point
When in DES mode with a vertical deviation
BLUE managed/WHITE selected
If OFF TRACK, what are MCDU predictions based on?
Assuming flight plan intercept at 45° or direct to the next waypoint if angle >45°
return-to -trajectory assumptions FCOM 22_20-10-40-30
