Microburst
IN REPLY TO: "I would think that windshear is not very likely. Sure, there was "some" wind, no really windshear-like conditions. And what's more, the B777 has a so-called Predictive Windshear System. (PWS) The system is always operational during approach, using the advanced weather radar on board. It is also operating, and scanning for windshear, even if the flight crew has switched off the WX radar.
It will display windshear in ahead on the navigation display, and announce: "caution, windshear ahead" or "go-around, windhear ahead" depending on the severity. And IMHO windshear will not cause a double flame-out."
I suggest there was 'windshear-like' conditions, specifically those of a microburst. Yes the 777 should provide confirmation of windshear conditions, but windshear is incredibly difficult to forecast and identify and the system you refer to could only specifically trigger an alert once already in windshear conditions, by which time the recommended escape manoeuvre of full thrust and alpha to stick shaker would have to be employed. "And IMHO windshear will not cause a double flame-out." Your final point there demonstrates quite overtly your ignorance on the subject of windshear; the danger associated with windshear has absolutely nothing to do with an aircraft's engines, but the massive degradation it has on the lift of even the largest aircraft. It is quite probable the reason BA 777 landed short of the runway today was because it encountered microburst conditions on short finals.