The ALPHA FLOOR protection is triggered when the FMGECs receive a signal elaborated by the PRIMs. This signal is sent when the aircraft angle of attack is above a predetermined threshold function of the aircraft configuration. The A/THR is automatically activated and commands TOGA thrust regardless of thrust lever positions. This protection is available from lift off to 100 feet RA in approach. Following indications are then provided : — A-FLOOR on the FMA and on the EWD as long as Alpha floor conditions are met — TOGA LK on the FMA when the aircraft leaves the Alpha floor conditions. TOGA thrust is then frozen A FLOOR and TOGA LK are displayed in green and surrounded by an amber flashing box. In order to cancel the ALPHA FLOOR or TOGA LK thrust, disconnect the A/THR.
Alpha floor is inhibited:-
— in case of engine failure with flaps extended
— in case of engine failure with derated TO selected
— in case of a single outer engine failure, with the flaps extended. (A340)
— in case of a single outer engine failure, with derated TO selected. (A340)
— in case of a dual engine failure on the same wing. (A340)
— below 100 feet at landing
— above M.53
Alpha Floor protection is lost in case of A/THR
Last edited by nitpicker330; 28th Sep 2012 at 01:38.