|Quoting D5DBY (Thread starter):|
if both engines would be shut of during flight...would you be able to operate the flight controls?
im talking about a AC like B737 or MD-80 which has hydraulic powered flight controls.
|Quoting VuelingAirbus (Reply 6):|
In spite of all the back up systems LongHauler made a very valid point. If there is no mechanical damage to the engines windmilling above 20 percent N1 will power hydraulics and thats easily achieved by the drift down speed.
|Quoting Kaddyuk (Reply 9):|
Correct, boeing decided that with the B747-400, the speed of four windmilling engines would be sufficient to provide hydraulic power.
|Quoting HAWK21M (Reply 11):|
What made the A320 want a RAT when the B737 did not.
|Quoting Mrocktor (Reply 13):|
The A320 does not have mechanical linkages to the ailerons and elevators, thus maintaining hydraulic power is essential to safe flight. FAR/JAR 25.671(d) requires control of the aircraft be maintained with both engines shut down, thus the RAT is necessary.