A320 Max Rec alt FL39800'
-low cost carrier checks in 162 soles at Asian weights of 73kg (circa), but more like 100kg each... (after all its Christmas)
-2Hr flight with alternate, maybe distant due SIN Wx.
-Bit of extra fuel added.
-On this day and early in the flight, Max Rec probably about FL385.(but possibly lower)
.... so heavy
-ISA +
-Request for climb FL380 (according to media reports)
-ITCZ activity (normal for this region)
-Probably a couple more slices of Reason cheese.. (late finish, early start,
probes iced up ..or some other factor that we are yet to find out about)
-Some speed brake (Airbus people will understand) use, then ..VLS ... V@prot.. AP disco ..Vmax ...thrust lock... etc
Equals = Classic jet upset probably with incorrect recovery technique.
(A320 does not like going high, near Max Rec)