Learjet 60 - Autopilot;Flight Director System; Flight Control System (FCS)

Pilot's Manual

Learjet 60
FLIGHT CONTROL SYSTEM
(FCS)
The FCS provides
3-axis autopilot/yaw damper,
dual flight director,
rudder boost and
automatic pitch trim functions
. The FCS contains
two flight control
computers and three primary servos
and is con-
trolled by a
glareshield-mounted Flight Control
Panel (FCP) . Each
side of the dual system
(pilot and copilot)
operates the same and both
work together to
drive the servos and the
pitch trim system .
The following information
is presented
in a general mannerand is in-
tended for
familiarization only . Refer to
"Collins Pro Line 4 Avionics
System For The
Learjet 60" Pilot's
Guide (P/N 523-0777003)
and the
FAA Approved
Airplane Flight
Manual for further
information on
the Flight
Control System
AUTOPILOT/FLIGHT
DIRECTOR SYSTEM
The
autopilot/flight director
system provides automatic
flight control
and guidance for climb,
cruise, descent and
approach . The system
provides dual channel
flight guidance,
and either channel can be cou-
pled to the autopilot
. Mode selection
and annunciation for each flight
guidance channel and
engage controls for
autopilot and yaw damper
are provided
through the glareshield-mounted
FCP . Mode and sys-
tem status
annunciation is also
provided on the appropriate
cockpit
displays .
The system
provides dual-channel
flight guidance in the pitch
and
roll
axis .
Dual-channel yaw
axis outputs are used for yaw
damping .
Pitch and roll axis change,
whencommanded by the
autopilot, is af-
fected through autopilot
elevator and aileron
servos . The autopilot
also provides pitch trim
commands to the secondary
trim system mo-
tor of the horizontal
stabilizer pitch trim actuator .
Autopilot pitch au-
thority is limited to 10° nose
down and 20° nose up
and roll authority
is limited to 32° for lateral
command, 27° bank for heading
or course
capture, and 15° for course
tracking and roll rate is limited
to
5°
per
second . Pilot inputs to the
autopilot/flight director system are
accom-
plished through the FCP, control
wheel switches and the course head-
ing panels . The pilot's flight
guidance system operates on 28 VDC
supplied through the 2-amp AP 1 and the 3-amp
FD 1 circuit breakers
on
the pilot's circuit breaker panel . The copilot's flight guidance sys-
tem operates on 28 VDC supplied through the 2-amp AP
2
and
the
3-
amp
FD
2 circuit
breakers on the copilot's circuit breaker panel . The
autopilot system operates
on
28
VDC supplied through the 2-amp
AP 1 and AP 2 circuit breakers .
5-52

PM-123
Original