TM 1-1520-238-T-4
5–2
SECTION I.
EQUIPMENT DESCRIPTION AND DATA
5–1.
EQUIPMENT CHARACTERISTICS, CAPABILITIES, AND FEATURES
5–1
a. Characteristics.
(1) The main rotor assembly and tail rotor assembly each consists of a rotor head and four rotor blades.
(2) Droop stop followers on the main rotor head limit pitch housing downward movement when the rotor is
stopped.
(3) The main rotor system is controlled by the collective and cyclic sticks at the pilot and copilot gunner
(CPG) stations. The tail rotor is controlled by the pilot and CPG directional control pedals. Refer to chapter 11 for
flight control system information.
(4) The main rotor provides lift and control for vertical, forward, rear, and side movement of the helicopter.
(5) The tail rotor provides directional control for the helicopter.
(6) The pitch angle of the main rotor blades can be controlled to increase or decrease the amount of lift the
helicopter has when climbing or descending.
b. Capabilities.
(1) The rotor blades provide lift and directional flight control capabilities in flight.
(2) The four–blade configuration of the rotor head gives the helicopter the ability to bob up without drifting
to a stop.
(3) The blades are fully articulated, with lead–lag capability. This balances the lift of the advancing and
retreating blades which increases airspeed capability.
c. Features.
(1) Anti–icing provisions are installed on the main and tail rotor blades to prevent ice formation.
(2) Trim tabs are mounted along the trailing edge of the main rotor blades and are used to adjust the blade
track through the air.
(3) The blades can be removed from the helicopter for transportation and storage.
5–2.
LOCATION AND DESCRIPTION OF MAJOR COMPONENTS
5–2
Rotor System.
The rotor system (fig. 5–1) consists of the main rotor head assembly, four main rotor blades, tail
rotor head assembly, and four tail rotor blades.
a. Main Rotor Head Assembly.
The main rotor head assembly (fig. 5–2) is a single, fully articulated
system. The major components consists of the hub assembly, four strap packs, the pitch housing assembly, a
droop stop follower, blade attachment pins, dampers and lead–lag links.
