Figure 7-41 shows a typical ram air unit. This type of
emergency hydraulic and electrical power when the
emergency system is intended for use only when
normal aircraft hydraulic system has failed. The
normal hydraulic pumps are completely inoperative.
turbine-driven hydraulic pump supplies fluid under
Because of differences in system designs, aircraft
pressure to the primary flight controls as well as to an
emergency system operating pressures will differ
emergency hydraulically driven alternator.
from one aircraft to another. The ram air turbine
The turbine system shown in figure 7-42 consists
system shown in figure 7-41 provides a means for
of a dropout governor-controlled turbine, a hydraulic
Figure 7-41.Ram air turbine hydraulic pump assembly.