Originally Posted by
CONF iture
1- AoA at 6 degrees and increasing + STALL warning
How is it possible the THS was still trimming up ?
What's wrong here ?
From GarageYears Link:
In Alternate Law, Valpha prot and Valpha max are replaced by VSW. Note that VSW is a stall speed and so is EAS sensitive unlike Valpha prot/max. Stick free aircraft aims to control alpha by limited authority stability order to less than VSW. If the stick input forces VSW exceedance, alpha floor activation of TOGA occurs. However, it is possible to stall the aircraft as the protection may be overridden.
and
Protections are as in Alternate 1 except that there is no bank angle protection in ALT 2 and in the case of failure of 2 ADRs, no VSW prot
So with the double ADR fail even Vsw prot would be lost thereby effectively losing basically all stall protection.
It has to be noted that Alt1+2 are Load Factor Demand laws with Auto trim.
So pulling Nose- Up sidestick command would cause Auto trim to trim Nose-up even above the stall.
I do not see anything indicating in the description of the laws preventing that in the situation AF was in.