TM 1-1520-238-T-7
Change 3
11–11
11–2.
LOCATION AND DESCRIPTION OF MAJOR COMPONENTS (cont)
11–2
(b) The magnetic brake assembly disengages to enable tracking of cyclic stick position. It reengages to
lock the new trim position.
(5) Longitudinal Mechanical Control Linkage.
The longitudinal mechanical control linkage is
transmitted through the right side of the fuselage to the aft side of the canted bulkhead, then routed up to the
longitudinal servocylinder. Longitudinal movement of the cyclic stick is transmitted through the mechanical control
linkage, longitudinal servocylinder, mixer, lateral links, swashplate assembly and pitch links, to the main rotor
blades causing the swashplate assembly and main rotor disk to tilt forward or aft.
(6) Longitudinal Servocylinder.
The longitudinal servocylinder, mounted on the transmission deck on
the right hand side forward of the transmission, provides hydraulic power to assist the longitudinal movements of
the mechanical control linkage. The output piston of the longitudinal servocylinder connects directly to the
longitudinal bellcrank on the mixer assembly.
(7) Mixer Assembly.
The mixer assembly, mounted above the main rotor support structure base
assembly, receives and combines control inputs from the collective and cyclic sticks for vertical, longitudinal and
lateral flight of the helicopter. The longitudinal bellcrank is part of the mixer assembly. It is horned shaped, with
both horns facing aft, and is attached to the longitudinal servocylinder, support bearings, and two longitudinal
links. Two longitudinal links are connected to the longitudinal bellcrank and the rear longitudinal bellcrank.
(8) Torque Link.
The torque link, mounted between the mixer assembly and the swashplate assembly,
provides vertical and longitudinal control of the stationary swashplate by the inputs received from the collective
and cyclic sticks. It also prevents the stationary swashplate from rotating.
(9) Swashplate Assembly.
The swashplate assembly, mounted on the static mast between the mixer
assembly and the main rotor head assembly, receives and transmits control inputs from the collective and cyclic
sticks to the main rotor head assembly. The swashplate assembly consists of a stationary swashplate, a rotating
swashplate, a self-aligning spherical, a slider bearing (uniball) and a bearing assembly (double-roll ball bearing).
Cyclic input tilts the swashplate assembly around the spherical ball (uniball) in the desired direction.
(a) The stationary swashplate, mounted to the double-roll ball bearing assembly below the rotating
swashplate, supports the swashplate assembly and receives control inputs from two lateral links and a torque link.
The stationary swashplate is an aluminum forging with three clevis lugs to attach the lateral links and a torque
link. It houses the self-aligning spherical and slider bearing, which attaches to the inner race of the double-roll ball
bearing assembly.
(b) The rotating swashplate, mounted to the double-roll ball bearing assembly above the stationary
swashplate, transmits control inputs received from the stationary swashplate to the main rotor head assembly via
the pitch link assemblies. The rotating swashplate is an aluminum forging with four clevis lugs 90 apart to attach
the pitch link assemblies. Two of the clevis lugs (180 apart) have pins to attach the two scissor assemblies. The
rotating swashplate houses the outer race of the double-roll ball bearing assembly.
(c) The bearing assembly, located between the stationary and rotating swashplate, allows the rotating
swashplate to rotate. The bearing assembly is a double-roll ball bearing assembly with a one-piece outer race and
a three-piece inner race, with flexible and removable upper and lower seals.
