Airbus a320 ALPHA-FLOOR PROTECTION

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AIRBUS A318/A319/A320/A321

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ALPHA-FLOOR PROTECTION
Alpha-floor protection automatically sets the thrust at TOGA thrust, when the aircraft reaches a very high angle of attack.
The Flight Augmentation Computer (FAC) generates the signal that triggers the alpha-floor mode.
This, in turn, sets TOGA thrust on the engines, regardless of the thrust lever positions (Refer to DSC-22_30-90 A/THR Modes - General).
The FAC sends this signal when:
‐ The angle of attack is above a predetermined threshold, that is a function of the configuration.
‐ In CONF 3 and CONF FULL, this threshold decreases as a function of the aircraft deceleration rate (down to – 3 °).
Alpha-floor is available from lift-off until the aircraft reaches 100 ft RA in approach.
Note: The αfloor is activated through the A/THR system, when:
‐ α is greater than αfloor (9.5 ° in configuration 0; 15 ° in configuration 1, 2; 14 ° in configuration 3; 13 ° in configuration FULL), or
‐ Sidestick deflection is greater than 14 ° nose up, with either the pitch attitude or the angle-of-attack protection active.
The αfloor function is available from lift-off to 100 ft RA before landing.
Alpha-floor is inhibited above M 0.6.
Note: ‐ Alpha-floor is lost, when one of the following combinations of failures occurs:
SFCC 1 and FAC2, or
SFCC 2 and FAC1, or
Both FCU channels, or
1 EIU, or
Both FMGCs.
‐ Alpha-floor is lost under alternate or direct flight control law.
‐ Alpha-floor is lost in engine-out, when slats/flaps are extended

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