Hi,
So, does anyone has an answer to CONF iture? I don't.
The question, as I understand it, is: why the A320 FCS didn't immediately reach for AlphaMax (17.5° AoA) in the specific AoA protection mode?
My guess would be that the software keeps a margin to avoid being in a position where the aircraft will lack down-pitch authority if needed (to avoid busting the strict 17.5° limit, that would lead to risking stall).
If correct, is the apparent 2.5° margin (in Habsheim's scenario) consistent? Isn't it too much?
Phenomenons that could explain the margin (non-exhaustive list, feel free to complete):
- Phugoïd and/or any sort of longitudinal aerodynamics-led unstability?
- Diminishing IAS?
- Provision for engine-led pitch up (throttling up)?
- ... ?
Last edited by AlphaZuluRomeo; 29th December 2013 at 17:34.
Reason: typo