Alpha Floor Protection A320

The alpha protection officially called the high angle of attack protection is not only a feature of the a330 but also a320 a340 a350 and a380 and it s one of the five main protections that airbus introduced to keep the flight safely inside the flight envelope on their fly by wire system.

Alpha floor protection a320. The α floor function is not available below 100 feet ra or. When activated it provides toga thrust. Alpha max will not be exceeded even if the pilot applies full aft deflection. The alpha floor function is not available below 100 feet ra or during single engine operation with flaps at conf 1 or greater.

Activation is roughly proportional to the rate of deceleration. Which corresponds with the angle of attack at which alpha protection becomes active the alpha floor function activated. V ls remains displayed. Alpha floor occurs at a predetermined angle of attack.

If high angle of attack protection is active the bank angle is limited to. At the alpha protection speed 4. As the aircraft decelerates into the alpha protection range the alpha floor is activated even if the autothrust is disengaged. Irl i don t know about the mfs one there is no way should be activating the alpha floor protection during a normal landing you shouldn t be in the orange bit of the speed tape the top of that represents vref.

This protection triggers the application of toga thrust and the aircraft will start to climb at a relatively constant low airspeed. This is done by software monitoring the plane s angle of attack sensor. In that mode the speed brakes retracted. An a320 is not a cessna you don t stall it on to the runway.

The amber boxed a floor annunciation is displayed when the speed is between alpha max and alpha protection and the auto thrust system commands to ga thrust regardless of thrust lever position. 5 figure 2 and the take off go around toga thrust. The a floor engaged mode changes to toga lk when a floor conditions no longer exist. Alpha floor protection is inhibited in some cases.

Alpha protection is a system which prevents the angle of attack from getting too high. The alpha floor function is inoperative. When alpha exceeds alpha prot elevator control switches to alpha protection mode in which angle of attack is proportional to sidestick deflection. Alpha floor is also triggered if the pilot applies a large aft stick input while either pitch attitude or angle of attack protection is active.

The pfd airspeed scale is modified. It also commands full thrust to all engines. Alpha floor is a low speed protection in normal law which is purely an autothrust mode.