FLIGHT CONTROL HYDRAULIC SYSTEM
Integrated Lower Control Actuators
Four integrated lower control actuators (ILCA) are in
the flight controls closet between sta. 95 and 120. The
actuators operate on 1,500 psi hydraulic pressure to
provide cockpit control boost in the pitch, roll, yaw, and
thrust axes and advanced flight control system (AFCS)
augmentation in the pitch, roll, and yaw axes. The
actuators are similar, but not directly interchangeable
unless the authority covers are transferred because the
actuators are assembled for the particular flight axis in
which they are installed.
NO BREAK - WORK HARDER
Each ILCA assembly has two independent boost
actuator systems and two AFCS extensible links.
Both systems are mounted together but operate
independently of each other. System No. 1 is the upper
half and system No. 2 is the lower half. Each extensible
link has a servo valve, relief valve, jam sensors, and self
feedback transducers. The thrust ILCA does not have an
AFCS extensible link, although it has two independent
boost actuator systems.