TM 1-1520-238-T-7
11–16
11–2.
LOCATION AND DESCRIPTION OF MAJOR COMPONENTS (cont)
11–2
(b) The magnetic brake assembly disengages to enable tracking of cyclic stick position and reengages
to lock the new trim position.
(5) Lateral Mechanical Control Linkage.
The lateral mechanical control linkage is transmitted through
the lower left side of the fuselage to the aft side of the canted bulkhead, then routed up to the lateral
servocylinder. Lateral movement of the cyclic stick is transmitted through the mechanical control linkage, lateral
servocylinder, mixer, lateral links, swashplate assembly and pitch links, to the main rotor blades. Lateral
movement of the cyclic stick causes the swashplate assembly and main rotor disk to tilt left or right accordingly.
(6) Lateral Servocylinder.
The lateral servocylinder, mounted on the transmission deck on the left hand
side forward of the transmission, provides hydraulic power to assist the lateral movements of the mechanical
control linkage. The output piston of the lateral servocylinder directly connects to the lateral 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 lateral bellcrank, part of the mixer assembly, is a long T shape and is attached
to the lateral servocylinder, collective bellcrank, and two lateral links. The lateral links transmit linear motion from
the lateral bellcrank to the nonrotating swashplate.
(8) Lateral Links.
Two lateral links, mounted between the mixer assembly and the swashplate assembly,
provide vertical and lateral control of the stationary swashplate by the inputs received from the collective and
cyclic sticks. The lateral links, along with the torque link, also move the stationary swashplate up or down for
vertical flight control of the helicopter. The lateral links also tilt the stationary swashplate right or left for lateral
flight of the helicopter.
(9) Torque Link.
The torque link, mounted between the mixer assembly and the swashplate assembly,
provides vertical and longitudinal control of the stationary swashplate by inputs received from the collective and
cyclic sticks while preventing the stationary swashplate from rotating.
(10) 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 and 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 the torque
link. The stationary swashplate, an aluminum forging with three clevis lugs to attach the lateral and torque links,
houses the self-aligning spherical and slider bearing, and 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
from 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 attachment pins for the two scissor
assemblies. The rotating swashplate houses the outer race of the double-roll ball bearing assembly.
