Flight Control Systems; Aileron; Roll Disconnect - BOMBARDIER LEARJET 40 Pilot's Manual

Pilot's Manual
SECTION V
FLIGHT CONTROL SYSTEMS &
AVIONICS

FLIGHT CONTROL SYSTEMS

The primary flight controls (ailerons, elevator, and rudder) are mechan-
ically operated through the control columns, control wheels, and rud-
der pedals. The flaps and spoilers are hydraulically actuated and
electronically controlled. Airplane trim systems (pitch, roll, and yaw)
are electronically controlled.

AILERON

The aileron control system consists mainly of three control circuits, one
in the fuselage area and one in each of the left and right wing area. In
addition, a disconnect mechanism is incorporated into the pilot's con-
trol wheel which allows the disconnection of the aileron control system
(in the event of a jam) and switching to spoileron system for roll control.
The fuselage control circuit connects both pilot's and copilot's control
wheels together, and each wing control circuit is connected to the
aileron drive mechanism. The three control circuits are connected to-
gether via a common sector assembly. In normal operation, whether by
an input from the autopilot or by manual input to one of the two control
wheels, the two control circuits will move in unison to drive the two ai-
leron panels. The aileron control system is considered the primary sys-
tem for roll control and is interfaced with the spoileron system for roll
augmentation.

ROLL DISCONNECT

If ailerons become jammed, the aileron control system can be discon-
nected and the spoileron system can be used for roll control. The pilot's
control wheel is disconnected from the aileron cables and copilot's con-
trol wheel by the red lever labeled ROLL DISC located on the hub of the
pilot's control wheel. This will also disconnect and prevent engage-
ment of the autopilot. Safe flight can continue on spoilerons alone. For
more information on roll disconnect, see Spoileron (ROLL DISCON-
NECT) system.
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PM-132A