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The main inputs to the flight envelope protection system are:

1 – GPWS signals
2 – ACAS signals
3 – angle of attack
4 – bank angle

The combination that regroups all of the correct statements is:

  • A
    3, 4.
  • B
    2, 3, 4.
  • C
    1, 2, 3, 4.
  • D
    1, 2.
A flight envelope protection system generates a control signal when the aircraft exceeds some flight envelope limits. The main functions of the flight envelope protection (FEP) system are:
  • the stall protection (with the stick shaker),
  • the bank angle protection,
  • the pitch angle protection,
  • the speed protection (overspeed or low energy state).
When speaking about the auto-throttle system, the FEP functions can provide a maximum and minimum speed reversion which will eventually increase/decrease automatically the thrust.

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