Autoflight

Question 1

FMGS contains

Answer 1

Provide prediction of flight time, mileage, speed, economy profile and altitude

• 2 FMGC
• 2 MCDU
• 1 FCU
• 2 FAC

Question 2

FMGS have 2 mode

Answer 2

- Flight management: + Display management
\+ prediction
\+ navigation
\+ management 
- Flight guidance: AP, FD, A/Thr

Question 3

MCDU

Answer 3

For crew loading and display of data, allow crew to interface with FMGC by selection of a flight plan for lateral and vertical trajectories and speed profiles

Question 4

FCU

Answer 4

Short-term interface between crew and the FMGC

Question 5

FAC

Answer 5

Controls rudder, rudder trim and yaw damper input –>Compute data for flight envelope and speed functions.
FAC provide warning for low-energy and wind shear

Question 6

Dual Mode

Answer 6

2 FMGC are synchronized each performs its own computations and exchange data through crosstalk bus
- If 1 AP engaged –>FMGC is master (FD onside, controll Athr, FMA 1+2)
- If 2 AP engaged: FMGC 1 is master
- If no AP engaged: FD 1 on FMGC 1 master
FD 1 off, FD 2 on FMGC 2 master

Question 7

Independent Mode

Answer 7

Each FMGC being controlled by its associated MCDU

Question 8

Single Mode

Answer 8

Using one FMGC only

Question 9

Back up Mode

Answer 9

Select on MCDU Menu when both FMGCs fail

They recover the nav functions through mcdu and IRS/GPS