Alexander,
 
ak> I think that a plane hydraulic system doesn't demand much power if
ak> it is in operation. So all flaps could work. The auto-pilot also does
ak> not consume much power.
 
You really are impossible ...
 
Please research the reallife examples of Air Canada 143 and Air Transat
236. Both cases are extremely well documented. In both cases when the
engines flamed-out there was a catastrophic loss of power due to generator
loss. The same happened with the US Airways Airbus that landed in the
Hudson. No hydraulic power ... no flaps, no spoilers, no secondary braking,
only manually released slats to the first position falling into place by
gravity.
 
ak> So when the plane glides down the RAM turbines of four engines could
ak> work out some energy. It can be enough for the auto-pilot and hydraulic
ak> system. So, the auto-pilot could work until the touch-down.
 
You are very stubborn.
 
1) An airplane such as the 777 only has one ("1") RAM airturbine
in the belly
   of the aircraft. It basically is a small propeller which provides some
   electricity but not that much. Cabin lights will be switched-off for
   example and only hydraulics to flaps but not all positions
2) A 777 has 2 engines, not 4
3) Hydraulics can not be powered by the battery
4) The battery of a 777 is a nickel-cadmium 20 cell 24V 16A battery. You
   cannot fly such an airplane on such a small battery. It only delivers
   power for starting-up the aircraft after it was parked, meaning powering
   some of the instruments and supporting certain ground-operations such as
   taxiing and refueling prior to APU-start, engine-start or hook-up to
   ground-power. In a 777 batteries are useless to even try and start an
   engine, as I said before this is done with compressed air.
   A 777's battery weighs 48kg, it's barely bigger that a regular
   car-battery, maybe x3 at v-best.
 
ak> A compass alone is not enough for flying in the complete darkness.
ak> If the Malaysia peninsula was covered by night clouds the plane could
ak> fly over the land.
 
Even with visibility "zero" a compass will still tell a pilot in
which direction it is flying. When the compass points "south",
the pilot "knows" he/she is going south and not "think"
he is going east as you previously suggested.
 
Let's just see what other nonsense you will be able to come up with.
 
 \%/{at}rd

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