[QUOTE]Do we know that, as a fact?/QUOTE]
No, but we know the following.........
The ATSB is investigating a stick shaker activation involving a Qantas Boeing 747, VH-OJU, 110 km SE of Hong Kong (BETTY IFR), on 7 April 2017.
While holding at flight level 220, the flight crew received a stick shaker activation and detected airframe buffeting. The flight crew disconnected the autopilot and manoeuvred the aircraft in response. Fifteen passengers received minor injuries.
People can stick their head in the sand as much as they like, but where there is smoke there is probably a little bit of fire...Lookleft makes more sense than those that state "NOTHING TO SEE HERE FOLKS, MOVE ON NOW..."