Originally Posted by Gabriel
In alternate law you get the worse of both worlds: No AoA / speed stability and no low speed / stall protections.
Specifically, in Alternate Law:
At the flight envelope limit, the aircraft is not protected, i.e.:
- In high speed, natural aircraft static stability is restored with an overspeed warning
- In low speed (at a speed threshold that is below VLS), the automatic pitch trim stops and natural longitudinal static stability is restored, with a stall warning at 1.03 VS1G.
- In certain failure cases, such as the loss of VS1G computation or the loss of two ADRs, the longitudinal static stability cannot be restored at low speed. In the case of a loss of three ADRs, it cannot be restored at high speed.