a) it was discovered on a software test rig, no in-service events or complaints from SIM rides
b) pre-condition is a significant deceleration, e.g. from 160 to Vls -10 kt (which is down to Vapp -15 kt on a normal day)
c) if at that point TOGA thrust would be applied
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d) the aircraft might pitch up and follow the thrust moment.
Which is not supposed to happen in the normal control law, where uncommanded attitude changes should be attenuated and contained. The A/C will still, they insist, normally respond to a nose-down command on the stick to overcome the pitching tendency.
In a sense, the AD is issued because it might behave like a conventional aircraft - and that is not supposed to happen.
Last edited by FlightDetent; 17th Sep 2019 at 11:02.