iceman50
ABNORMAL ATTITUDE LAWS
An abnormal attitude law in pitch and roll is provided if the aircraft is in flight and in any of these conditions :
— Pitch attitude > 50° nose up or 30° nose down
— Bank angle > 125°
— Angle of attack > 30° or < 10°
— Speed > 440kt or < 60kt
— Mach > 0.96 or < 0.1
The law in pitch is the alternate law without protection (except load factor protection) and without auto trim. In roll it is a full authority direct law with yaw alternate.
After recovery, the flight controls laws are:
in pitch : alternate law
in roll : direct law with yaw alternate law
The conditions described above, due to the "any" in the first sentence, are assumed to be "mutually exclusive" and any one or a combination will trigger ABNORMAL ATTITUDE LAW.
Not so, and the FCOM has unintentionally lead everyone astray.
Due to the discrepancy in the airspeed measurement, all three ADRs were rejected by the FCC, which left either of the inertial input criteria:-
— Pitch attitude > 50° nose up or 30° nose down
— Bank angle > 125°
to be met.
This didn't happen.