Originally Posted by galaxy flyer
You made me think, glhcarl! The answer is, the flight manual procedure using the spoilers was for loss of systems 1,2,3, in which case all pitch control was lost. You could use the ground spoilers, powered by remaining system 4 to make rough pitch corrections. Systems 1,2,4 caused loss of roll control.
Cannot understand why Lockheed did not make the flight controls symmetrical down to one system--easily doable, the L-1011 was.
GF
I have no experance with the C-5 but I assumed it had the same basic hydraulic system design the L-1011 did. Losing three of the four L-1011 systems, the most you could lose is yaw control.