TM 55-1520-228-10
2-30. HORIZONTAL STABILIZER.
The horizontal stabilizer (figure 2-1 and figure 2-2) is
located near the center of the tail boom an is installed in
a predetermined fixed position. The horizontal stabilizer
aids in trimming the helicopter in level flight and
increases usable CG range.
2-31. VERTICAL FIN.
The vertical fin is located to the right of the tail rotor and
is installed in a predetermined fixed position.
SECTION VI. HYDRAULIC SYSTEM
2-32. DESCRIPTION.
The hydraulic system consists of a variable delivery
pump and reservoir, servo actuators with irreversible
valve circuits for cyclic and collective controls, a
pressure line filter, a return line filter, and a solenoid
shutoff valve. The pump is located on the transmission.
The hydraulic system provides for fully powered flight
controls during authoritative flight.
2-33. CONTROL
A hydraulic system switch (HYD BOOST) is located on
the lower right portion of the instrument panel and
controls the activation and deactivation of the hydraulic
system. (Refer to figure 2-13 and figure 2-14.)
2-34. CAUTION INDICATOR.
A caution indicator is located on the caution panel to
indicate when hydraulic pressure is low (figure 2-13 and
figure 2-14).
2-32 Change 10
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