I read a lot of air incident investigation reports. The aviation industry is a shining example of sharing and learning, resulting in increased safety. I wish that the cyber industry on the ground could find a way to effectively share similar experiences and learnings. Anyway, one report caught...
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Вот из самой директивы по этому случаю (2014-0266-E_1)
An occurrence was reported where an Airbus A321 aeroplane encountered a
blockage of two Angle Of Attack (AOA) probes during climb, leading to
activation of the Alpha Protection (Alpha Prot) while the Mach number
increased. The flight crew managed to regain full control and the flight landed
uneventfully.
When Alpha Prot is activated due to blocked AOA probes, the flight control laws
order a continuous nose down pitch rate that, in a worst case scenario, cannot
be stopped with backward sidestick inputs, even in the full backward position. If
the Mach number increases during a nose down order, the AOA value of the
Alpha Prot will continue to decrease. As a result, the flight control laws will
continue to order a nose down pitch rate, even if the speed is above minimum
selectable speed, known as VLS.
This condition, if not corrected, could result in loss of control of the aeroplane.