Originally Posted by
takata
Hi Hyperveloce,
It's hard to tell as it could be overriden by the pilot, but with VSw displayed, Stall alarms workings... certainly.
Check it by yourself:
*ALTERNATE LAW 2:
- Low speed stability is lost with double ADR fault.
- High speed stability is lost with triple ADR fault.
Hi Takata. Ok, the gentle ND introduced by the low speed prot. can be overriden by the PF (and maybe the PF persistant NU inputs were to counteract the low speed prot. ND orders, but he did so much more than that). But if we consider the past UAS incidents analyzed by the BEA, do we see a single occurrence of a low/high speed prot. activation when the ALT2 was triggered by a NAV disagreement ? In a few past cases, a descent (never more than 5000 ft) was decided when the stall warnings sounded but it was a PF action. Can we assume that these low and high prot. were not available in all these UAS incidents and in the AF 447 case ?