I also think it was a stall. Having the gear down way too long after the go around didn't help matters. Things didn't start to get unusual until they pitched up for the go around. You can tell the ailerons are not operating very effectively during this period. The aircraft seems basically out of control.
It wasn’t a stall. The A320 won’t stall in normal law. It was a PIO exacerbated by the fact that the control laws limit the speed at which the roll rate can be corrected - particularly at landing speeds. The pilot puts in a large input to correct an initial upset caused by turbulence. The result is that it takes longer than expected to roll the airplane back the other way. This causes the pilot to hold the correction in longer than normal and the Airplane starts to roll the other way. The pilot puts in opposite airleron to counteract, but that roll rate is also limited by the computer so it goes past wings level to the other side. Rinse. Repeat. I’ve seen it countless times, but never to this level.
Isn't that a little disingenuous? The Airbus will stall, it'll just go into alternate law first. On a forum for Airbus pilots one one of them mentioned this:
"Or you could get into a heavy windshear (say 100kts within a second or so), so that the aircrafts authority to pitch down wouldn't be enough, but split seconds before stall you would lose valid speed information and crash in alternate law, too."
Any airplane will eventually bite back. You never know which system will not the fan at a critical moment on flight.
There was nothing in that video that shows something that would have caused an a transition to Alternate Law. The airplane stayed firmly within the Normal Law envelope.
The recovery in the A320 for windshear or terrain escape is full back stick and hold. It won’t stall. That’s the way Airbus designed it.
I suppose that it’s possible that a 100 knot sudden wind shear would trigger Alternate Law through a crazy pitch or roll, but the video doesn’t show that happened to this airplane.
Not sure why it’s so hard to believe that this is a PIO incident for some of you. For anyone with significant time on the Airbus, it’s not a huge surprise. It happens to us all eventually... just normally not to this extent.
I’m guessing they got smacked with a good size rotor and in trying to counteract that event they got into a good sized, increasing PIO. They eventually got it sorted after making a good decision to go around. No harm, no foul.