Autoflight Flashcards
What is the minimum height for the autopilot on takeoff?
100ft AGL and at least 5 secs after takeoff
What is the minimum height for the autopilot when using:
Final APP, V/S, FPA?
ILS CAT I?
Circling approach?
Final APP, V/S, FPA: 250ft AGL
ILS CAT I: 160ft AGL
Circling approach: 500ft AGL
In the FMGC, what is meant by recommended max?
Recommended maximum altitude computed based on gross weight and temperature assuming anti ice is OFF.
Use perf application EFB if icing conditions expected.
Limit FL398
Gross error check for calculating green dot?
1.5 X weight (metric tons) +110
Eg weight is 62 tons = 62x1.5+110=203kts
On some types there can be a discrepancy between vapp on the PFD and that on the FMGC, why?
Ref speed on PFD calculated by the FACs and FMGC by weight and CG position.
When is the autoland light armed?
200ft AGL
Briefly explain the function of groundspeed mini?
Autothrust function that uses the energy or inertia of the aircraft to compute a safe approach speed during varying wind conditions. The calculation uses tower wind and actual winds aloft to vary the target speed to maintain a safe energy during the approach.
If you lose an FMGC, how might this effect what you see on PFDs 5th column, and how might this effect the ND?
AP/FD now in single mode operation (2FD2). NDs will need to be selected to the same range to restore MAP functions. Loss of an autothrust channel? Try engage the other.
What methods does the aircraft have to calculate its own position?
Each FMGC calculates its own position (FM position) from a MIX IRS position and a computed radio position, or GPS position.
What is the aircraft’s FM position comprised of? What is EPE?
MIX IRS/GPS position
EPE= estimated position error seen on the progress page predictive GPS
What is meant by GPS primary?
RAIM capability with indicated NAV accuracy
With a loss of both FMGCs, how do you recover radio nav?
NAV BACKUP (covered switch on RMP) not to be confused with BACKUP NAV which takes a freeze frame of the previous flight plan in the MCDU
Prior to entering a hold, what will happen when you press the immediate exit button?
Aircraft will not enter the holding pattern, but will resume it’s applicable managed speed for the flight phase.
Once in the hold, what will happen when you press immediate exit?
If heading towards the hold fix, aircraft will exit at next fix overfly.
If on the outbound leg, aircraft will make immediate turn towards the fix where the hold will be exited.
For alternate planning, what assumptions are made for flight level and speed by the FMGC in terms of fuel burn for the alternate?
CI 0
FL100 <100NM
FL220 between 100nm-200nn
Explain SRS
Speed reference system, controls speed via the elevator, adjusts to maintain a speed.
On takeoff target V2+10
Are there any protections with SRS?
Flight path angle minimum VS 120ft/min.
Pitch angle protection= reduce A/C nose up
Speed limiting= limiting target speed to V2+15kt
What would happen when selecting a revised altitude when aircraft is in ALT*?
ALT* reverts to VS/FPA when the flight crew changes the FCU altitude by more than 250ft
What is the two engine operating range of the autothrust?
IDLE to CLB
What is the single engine operating range of the autothrust?
IDLE to MCT
With autothrust failure, what FMA do you expect to see?
THRUST LOCK would appear on the FMA and ECAM chime every 5 seconds
If you took off in FLEX, how do you achieve MCT in an engine failure after takeoff?
Move thrust levers back to CLB then forward again to MCT
What is the guidance for selecting reverse with one reverser inop?
SELECT BOTH
If you move the thrust levers below the CLB detent, what FMA would you expect to see?
LVR CLB would flash continuously in the FMA 1st column
