MCDU

Question 1

What happens to the REC MAX FL indicated on the PROG page of the MCDU as temperature changes?

Answer 1

The REC MAX FL decreases as temperature increases

Question 2

Apart from the requirement to input new winds for certain changes, when should winds be inserted?

Answer 2

First waypoint after TOC and at the first WPT after a step climb

Question 3

What does the REC MAX FL in MCDU provide?

Answer 3

A 0,3 G buffet margin

Question 4

What happens if you insert a FL that is higher than the REC MAX FL?

Answer 4

It will only be accepted if it provides a buffet margin greater than 0,2 G

Question 5

What does the OPT FL in the MCDU give you?

Answer 5

Cruise altitude for minimum cost when ECON MACH is flown.
OPT FL is only meaningful only if the wind and temperature profile is accurately entered

Question 6

How is the descent profile calculated by the FMGS?

Answer 6

It calculates the T/D point backwards from 1000 ft on final approach with speed at VAPP

Question 7

At what interval should winds be inserted in to MCDU?

Answer 7

At waypoints where there is a difference of either:
- 30 deg lat/long
- 30 kt difference in wind data
- 5 deg C of temperature difference

Question 8

What is the requirement for soft altitude mode to be activated?

Answer 8

ALT CRZ is the active Vertical Mode

Question 9

What is the Soft Alt mode?

Answer 9

AP will allow -+50 ft altitude variations to keep cruise Mach before readjustment of thrust occurs, if you are in ALT CRZ