A320 ALPHA FLOOR after T/O
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A320 ALPHA FLOOR after T/O
Hey guys,
Just wondered if this is unheard of.
Company A320 took off heavy (75t) and approx 2000' had ALPHA FLOOR activate due to windshear. They were slow and heavy during climb but as they encountered the windshear, their airspeed dropped down to approx 140kts and alpha floor activated.
Crew handled it well and followed SOPs but was just curious if what happened was a safe non-event or something was missed by the crew?
Thanks.
Just wondered if this is unheard of.
Company A320 took off heavy (75t) and approx 2000' had ALPHA FLOOR activate due to windshear. They were slow and heavy during climb but as they encountered the windshear, their airspeed dropped down to approx 140kts and alpha floor activated.
Crew handled it well and followed SOPs but was just curious if what happened was a safe non-event or something was missed by the crew?
Thanks.
It's not unheard of
It's not a non-event
Hard to say if something was missed. Was WS reported? Without knowing the config of the aircraft at the time etc. it would be hard to answer
It's not a non-event
Hard to say if something was missed. Was WS reported? Without knowing the config of the aircraft at the time etc. it would be hard to answer
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Guys, surely this should have generated more food for thought.
A near MTOW A320 on early climbout suffered ALPHA FLOOR due to a sudden change of wind. Apparently no warning for the windshear.
The change of hwind to twind caused IAS to drop below stall speed.
A/C was potentially F+1F but not sure about that.
A near MTOW A320 on early climbout suffered ALPHA FLOOR due to a sudden change of wind. Apparently no warning for the windshear.
The change of hwind to twind caused IAS to drop below stall speed.
A/C was potentially F+1F but not sure about that.
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Would a windshear alert be generated at 2000'? Normally 1500' is the cutoff... but I don't have any A320 manuals to hand in order to verify that statement.
As to the rest, winds can do that, A/floor is a possible consequence but until any of us see the data or the report absolutely none of us can comment...
ps. F+1F isn't an A320 conf setting I've heard of [pedantic mode;-)]
As to the rest, winds can do that, A/floor is a possible consequence but until any of us see the data or the report absolutely none of us can comment...
ps. F+1F isn't an A320 conf setting I've heard of [pedantic mode;-)]
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Reactive windshear is available up to 1300ft, predictive 1800 or 2300 depending on the weather radar.
Since A.FLOOR is available from lift off to 100ft RA, I'd imagine it will be activated if the conditions are met. The right thing to do probably is to put TOGA on realising that the speed is reducing rapidly, to try prevent putting the aircraft in that situation, and not wait for the w/s warnings even if it's within the warning envelope.
Since A.FLOOR is available from lift off to 100ft RA, I'd imagine it will be activated if the conditions are met. The right thing to do probably is to put TOGA on realising that the speed is reducing rapidly, to try prevent putting the aircraft in that situation, and not wait for the w/s warnings even if it's within the warning envelope.
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The aircraft behaved as designed. Alpha floor is a function by itself it has following requirements:
At 2000ft. wind shear alert would not be triggered. It has it's own conditions.
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.
‐ 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.
The windshear detection function is provided by the Flight Augmentation Computer (FAC) in takeoff and approach phase in the following conditions: ‐ At takeoff, 3 s after liftoff, up to 1 300 ft RA
‐ At landing, from 1 300 ft RA to 50 ft RA
‐ With at least CONF 1 selected.
‐ At landing, from 1 300 ft RA to 50 ft RA
‐ With at least CONF 1 selected.
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Reactive windshear is based on equivalent angle of attack FAcs on a320, FE on a330 and the Prims on a350
I really don't see what food for thought is needed, it's a protection mode it kicked in , out of shear and recovered normally ...
You practice this on nearly every recurrent
I really don't see what food for thought is needed, it's a protection mode it kicked in , out of shear and recovered normally ...
You practice this on nearly every recurrent
