A typical Navy helicopter, the H-60, is shown in
figure 4-17. Some of its features include a single main
rotor, twin engine, tractor-type canted tail rotor,
controllable stabilizer, fixed landing gear, rescue hoist,
external cargo hook, and weapons pylons. The fuselage
consists of the entire airframe, sometimes known as the
body group.
The body group is an all-metal semimonocoque
construction. It consists of an aluminum and titanium
skin over a reinforced aluminum frame.
LANDING GEAR GROUP
The landing gear group includes all the equipment
necessary to support the helicopter when it is not in
flight. There are several types of landing gear on
helicopters—conventional
fixed
(skid
type),
retractable, and nonretractable.
Main Landing Gear
The H-60's nonretracting main landing gear
consists of two single axle, air/oil type of shock-strut
assemblies that mount to the fuselage. Each is equipped
with tubeless tires, hydraulic disc brakes, tie-down
rings, drag braces, and safety switches. They are part of
the lower end of the shock strut piston.
Tail Landing Gear
The H-60's tail landing gear is a nonretracting, dual
wheel, 360-degree swiveling type. It is equipped with
tubeless
tires,
tie-down
ring,
shimmy
damper,
tail-wheel lock, and an air/oil shock-strut, which serves
as an aft touchdown point for the pilots to cushion the
landing shock.
MAIN ROTOR ASSEMBLY
The main rotor (rotor wing) and rotor head (hub
assembly) are identical in theory of flight but differ in
engineering or design. They are covered here because
their functions are closely related. The power plant,
transmission, drive-train, hydraulic flight control, and
rotor systems all work together. Neither has a function
without the other.
Rotary Wing
The main rotor on the H-60 (fig. 4-17) has four
identical wing blades. Other types of helicopters may
4-15
Anf0417
Figure 4-17.—H-60 helicopter.
