Originally Posted by Bearfoil
How quickly does a/p respond to declining a/s's
What is monitored is CAS value, by two independant systems working in parallel: actually -> 0.45 second at autoflight level (1) and 1 second at FCPC level (2).
1) Fluctuation fo CAS resulting of 20 kt change in 0.45 seconds will cause A/P to disconnect, and further A/FLT systems if confirmed.
2) Fluctuation of CAS resulting of 30 kt change in 1 second will cause ALTERNATE LAW 2 to trigger, and further F/CTL if confirmed.
The next step is a 10 seconds monitoring test which retains the last valid CAS (median value of 3 ADRs) for comparison with CAS value at the end of this time window.