α-Floor safety isn’t available so conventional pilot stall restoration action is required. There are three primary reconfiguration modes for the Airbus fly-by-wire aircraft, Alternate Law, Direct Law and Mechanical Back Up. Alternate Law is subdivided into two considerably different configurations dependent upon the specific failure(s). The ground mode and flare modes for Alternate Law are identical to these modes for Normal Law. This mode is routinely engaged when the radar altimeter signifies a hundred toes above ground and offers for a direct sidestick to elevator relationship.
Alternate Law 1 (ALT1) combines Normal Law lateral mode with Alternate Law pitch modes. Low Energy Protection is changed by Low Speed Stability meaning that the aircraft no longer has automatic stall protection. At low pace, a nose down demand is introduced based mostly on IAS (as an alternative of AOA) and Alternate Law modifications to Direct Law. In addition, an audio “STALL” warning …