Hi Chris Scott,
Sorry for the delay in finding this info.
Post #270: I note Owain Glyndwr's quick response that reversion to Pitch Alternate may not have been necessary during the certification flights. Experience suggests he is usually right,...
You and Owain are correct. Please see
http://sfte2013.com/files/78988645.pdf, slide 35
"Test Conduct - Stalls for certification
in FBW aircraft
• Initially performed at forward CG
• Must be performed in Normal Law
– In case a stall occurs despite the protections
– Airbus - Normal Law modified with higher limiting AOA"
edit.
Hi Owain Glyndwr,
I see that for quite a time the elevator was moving downwards and the AOA dropping even though the sidestick was being held fully back. Hmmmm!
Could than be explained by the FBW computers sensing the rate of speed decay, knowing the rate of pitch change available, and anticipating the change in attitude necessary to avoid exceeding aMax?
Hi HN39,
In short: Vs is the speed obtained when the sidestick reaches the aft stop, i.e. Vs = V(alpha-max)
The above presentation suggests the aircraft is actually taken beyond CL Max, and its behaviour is observed in both Normal law and "Additional stalls performed with degraded control laws" (slide 35) to determine VS1g.