Textron Cessna 172R - Page 397

CESSNA
MODEL
172R
SECTION
9
-
SUPPLEMENTS
SUPPLEMENT
7
-
FAA
APPROVED
I
SUPPLEMENT
7
BENDIX/KING
KAP
140
SINGLE
AXIS
AUTOPILOT
SECTION
1
GENERAL
The
Bendix/King
KAP
140
is
an
all-electric,
single-axis
(aileron
control)
autopilot
system
that
provides
lateral
and directional control.
Components
are a
computer,
a
turn
coordinator,
an
aileron
actuator,
a
course
deviation
indicator,
and
a
directional indicator
or
HSI
(if
installed).
Roll
and
yaw
motions
of
the
airplane
are
sensed
by
the
turn
coordinator
gyro.
The
computer
computes
the
necessary
correction
and
signals
the
actuator
to
move
the
ailerons
to
maintain
the
airplane
in
the commanded lateral attitude.
The
KAP
140
will
provide
wing
leveler,
heading
hold,
NAV
track,
and
approach
and
backcourse
lateral
modes.
A
lockout device
prevents
autopilot
engagement
until the
system
has been
successfully preflight
tested.
Automatic
preflight
self-test
begins
with initial
power
application
to
the
autopilot.
The
following
conditions
will
cause
the
autopilot
to
disengage:
A.
Electric
power
failure.
B.
Internal
autopilot
system
failure.
C.
Turn coordinator
failure
(flagged
gyro).
D.
Computer
autopilot
monitor
that
detects
the
R
(ROLL)
axis
annunciator.
The
AVIONICS
MASTER
switch
supplies
power
to
the avionics bus
-
bar
at
the radio
circuit breakers
and the
autopilot
circuit
breaker.
The
AVIONICS
MASTER
switch also services
as
an
emergency
autopilot
(AP)
shutoff.
Revision
4
S7-5
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