Cessna 172S Pilot Operating Handbook page 91

CESSNA
MODEL 1 72S
BENDIX/KING KAP 140 SINGLE AXIS AUTOPILOT
The Bendix/King KAP 1 40 is an all-electric, single-axis (aileronl
control) autopilot system that provides lateral and directional control.
Components are a computer, a turn coordinator, an aileron actuator,
a course deviation i ndicator, and a directional indicator or H S I (i1l
i nstalled).
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 l ateral attitude.
The KAP 1 40 will provide wing leveler, heading hold , NAV track,
and approach and backcourse lateral modes.
A lockout device prevents autopilot engagement u ntil the system
has been successfully preflight tested. Automatic preflight self-test
begins with i nitial power application to the autopilot.
The following conditions will cause the autopilot to d isengage:
A. Electric power fail ure.
B. Internal autopilot system failure.
C. Turn coordinator fail u re (flagged gyro).
D. Computer autopilot monitor that detects the R (ROLL) axis
ann unciator.
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.
May 30/00
SUPPLEMENT 7 -
SUPPLE ENT
SECTION 1
GENERAL
SECTION 9 - S UPPLEME NTS
FAA
APPROVED
I
l
S7-5