The elevator forward disconnect is a me-
chanical clutch mechanism located on the
torque tube between the control columns
(Figure 15-2). The elevator aft disconnect is
an electro-mechanical device located in the top
of the vertical stabilizer (Figure 15-2). When
the ELEV T-handle is pulled, a two position
linear actuator on the elevator aft disconnect
assembly is energized to the extended (dis-
connected) position. The linear actuator will
remain in the extend position until a retract
command is given (ELEV T-handle reset to
stowed position).
When the elevator aft disconnect is actuated,
the elevator disconnect sensor will send a sig-
nal through DAU 2 to display an "ELEVA-
TOR DISC" message on the CAS. The
“ELEVATOR DISC” CAS message is amber
with the airplane on the ground and white
when the airplane is airborne.
Returning the ELEV T-handle to the stowed
position (full in and vertical) will reconnect
the elevator disconnects and extinguish the
CAS message (Table 15-1). If the autopilot is
engaged when elevator disconnect is activated,
the autopilot will disengage and it cannot be
engaged while the elevator is disconnected.
Electrical power used by the elevator discon-
nect system is through the ELEV DISC circuit
breaker located in the FLIGHT group on the
pilot's circuit breaker panel.
AILERONS
General
The ailerons are hinged to the trailing edge of
the wings and are connected through pulleys
and cables to the control wheels (Figure 15-
6). The ailerons can be mechanically posi-
tioned with either control wheel or by the
autopilot roll servo actuator.
Aileron Balance Tabs
Each aileron contains a balance tab controlled
by dual push-pull tubes attached to the fixed
wing surface (Figures 15-6 and 15-7). The
function of the balance tab is to reduce pilot
effort at the control wheel when deflecting
the ailerons against air loads inflight.
Autopilot Roll Servo
The ailerons are positioned by a roll servo
when the autopilot is in use.
The autopilot roll servo is a two direction
torque motor mounted within the wing/fuse-
lage fairing and is coupled via a closed loop
cable to the aft aileron control quadrant as-
sembly in the center wing area (Figure 15-6).
The roll servo incorporates an electrical clutch
that engages only when the autopilot is en-
gaged. In the event of a malfunction, the servo
can be manually overridden by the pilot or
disconnected by disengaging the autopilot or
by depressing either Control Wheel Master
Switch (MSW). Depressing and holding the
Touch Control Steering (TCS) button also dis-
engages the roll servo clutch, but does not
disengage the autopilot (Figure 15-3).
The roll servo receives electrical power
through the AFCS SERVOS circuit breaker
in the FLIGHT group of circuit breakers on the
pilot's circuit breaker panel.
Aileron Trim
An aileron trim tab is an integral part of the
left-hand aileron surface (Figures 15-6 and
15-6
FOR TRAINING PURPOSES ONLY
LEARJET 45 PILOT TRAINING MANUAL
FlightSafety
international
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