TM 1-1520-238-T-7
11–46
11–7.
SYSTEM DESCRIPTION (cont)
11–7
(e) The mechanical control and collective linkage (fig. 11–17) provide an increase or decrease in
collective movement to the collective servocylinder. The collective bellcrank provides a pivot point for the
mechanical control linkage.
(f) The collective servocylinder, connected to the mixer assembly, hydraulically assists the mechanical
linkage by moving the flight controls up or down. The mixer assembly collective bellcrank receives input motion
from the collective servocylinder and transmits vertical linear motion to the nonrotating swashplate. An increase in
collective mechanical input to the collective servocylinder pivots the collective bellcrank downward.
Simultaneously, the two lateral links and torque link moves upward. The combined upward link movements raise
the stationary swashplate, equally increasing the blade pitch angle on all four main rotor blades.
CPG COLLECTIVE STICK
(LVDT, (SPAD), AND 1G
SPRING ASSEMBLY
BELL CRANK
SCISSORS
ROTATING
SWASHPLATE
TORQUE
LINK
LATERAL
LINK
MECHANICAL CONTROL
LINKAGE
COLLECTIVE
SERVOCYLINDER
COLLECTIVE
LINKAGE
PITCH LINK
MIXER ASSEMBLY
STATIONARY
SWASHPLATE
PILOT COLLECTIVE STICK (LVDT), (SPAD),
AND 1G SPRING ASSEMBLY
M70-254A
Figure 11–17.
Collective Flight Control System Interface Diagram
