TM 55-1520-240-23-9
11-1
FLIGHT CONTROLS
(Continued)
11-1
There are four integrated lower control actuators. The
actuators are similar but not interchangeable, once they
are set up for a particular control. The pitch, roll, and yaw
ILCA’s have a dual boost actuator and two extensible link
actuators. The thrust ILCA does not have the extensible
links. The boost actuators provide hydraulic assist for
cockpit control inputs. The extensible links are actuating
cylinders, controlled by the AFCS, which provide inputs
to the upper flight control servocylinders, without any
corresponding motion of cockpit controls. If the AFCS is
not in use, the extensible links act as rigid links.
The DASH actuator installed in the pitch control system
consists of two electromechanical linear actuators
mounted on an aluminum tube. Both actuators receive
identical control signals from the AFCS, which extends
or retracts the actuators, to position the helicopter as
required by the control stick movement and to maintain
the desired airspeed.
11-4
