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GTC58 said:
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The B777 has a super critical wing, as such it is not really designed to have aerodynamic inherent stability. Without pilot inputs it doesn't take very long for the aircraft to depart its altitude and flight path in manual flight.
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This is not true at all. The B777 is a fly by wire aircraft, the aircraft is flow by the primary flight computers (PFC) which interpret pilot inputs to the flying controls and the current flying conditions (speed, alt, configuration) and move the control surfaces as appropriate. If there is any inherent instability of the wing design it is irrelevant.
If the the auto pilot is switched off and the pilot makes no input on the flying controls the aircraft will continue to fly on roughly the same path as it was before the A/P disconnected.
A question for actual B777 piloten only plz: So is it therefore possible that a B777-200ER could fly on with an incapacitated crew, no LNAV or VNAV, fuel burn GW and trim changes, and stay in the air no doubt with phugoid altitude excursions and heading changes typical of those reported by RMAF AD radar ? And of course, going near but not through the waypoints as alluded to by the latest Malaysian press conference effort.
If you tried it in the sim, what happened ?