Originally Posted by
prestonh
Thanks. Curious if the 767-300 hydraulic systems are similar to the 757. I.e. if one of the engines are shut down it would affect brake thrust reverse spoilers etc depending on the engine and system.
Similar, but different.
Both the 757 and 767 have three hydraulic systems, Left, Center, and Right. The distribution of loads varies significantly. On the 757, the Left system has the big-draw items. On the 767 it is the Center. Left and right systems are powered by their respective engine-driven pumps as well as an electric pump. The Center has two electric pumps and, on the 767, a pnuematic hydraulic pump. Each also has a PTU (hydraulically driven hydraulic pump) but it does different things on each airplane.
You don't lose a hydraulic system when an engine fails, you only lose that engine's engine-driven hydraulic pump You still have that system's electric pump. You would still have the thrust reverse on the operating engine.