BendixKing KAP 140 - Manual (Page 16)

Introduction
8 KAP 140 AUTOPILOT SYSTEM
Rev. 1
Apr/02
AP
G
KAP 140
HDG NAV APR REV
KAP 140 Preflight Test Complete
AP
G
KAP 140
HDG NAV APR REV
KAP 140 Preflight Test
Power Application and Preflight Tests
A preflight test is performed
upon power application to the com-
puter. This test is a sequence of
internal checks that validate proper
system operation prior to allowing
autopilot engagement. The preflight
test (PFT) sequence is indicated by
“PFT” with an increasing number for
the sequence steps. Successful
completion of self test is identified by
all display segments being illumi-
nated (Display Test) and the discon-
nect tone sounding.
For two-axis units only:
NOTE: Following the preflight test,
the red P warning on the face of the
autopilot may illuminate indicating
that the pitch axis cannot be
engaged. This condition should be
temporary, lasting no more than 30
seconds. The P will extinguish and
normal operation will be available.
NOTE: The red P warning may illu-
minate when the autopilot is not
engaged. This can occur when
autopilot G limits have been
exceeded during turbulence or air-
craft maneuvering. Autopilot
engagement is locked out during red
P illumination.
If power to the autopilot is cycled in
flight (i.e. through the autopilot circuit
breaker for instance) it is possible
that a 5 minute delay may be neces-
sary prior to autopilot engagement to
allow the pitch axis accelerometer
circuit to stabilize. Engagement prior
to stabilization may result in mildly
erratic pitch axis behavior.