Remote-Mounted
Units
KCP
420
Flight Computer
The KCP 420 Flight Computer pro-
vides all flight director and autopilot
command computations as well as
safety monitoring functions. Fully
digital for reliability and repeatability,
the KCP 420 employs dual channels
for command computation. Each
calculation is computed separately
and simultaneously by each channel,
with the results compared for consis-
tency by a third channel devoted
to
system monitoring
.
A “fail-passive” system, the
KCP 420 prevents the possibility of
servo
overcontrol by both disengaging
the affected servo motor clutch and
shutting
off
motor drive power upon
detecting a fault. The system can
either disengage affected autopilot
control axes individually or,
if
neces-
sary, shut down the entire flight
director/ autopilot system. In addition,
the KCP
420
generates audio alerts in
case of autopilot disconnects or trim
failures.
For ease of maintenance, the
KCP 420
also
contains the electronic
components that drive the
servo
mo-
tor assemblies. Servo drive circuits
are located near the walls of the Flight
Computer enclosure to enhance
component cooling and, therefore,
reliability.
The KCP
420
provides both
analog and digital (ARINC 429)
interfaces, making it compatible with
both electromechanical (KCI
31
O/A/
KPI 5538) and electronic
(EFS
10)
flight instrument systems.
KDA
430
Gyro Adapter
KFC 400. The Gyro Adapter also
converts analog data in Gold
Crown
Ill
installations from the
KDF
806
ADF and radar altimeter
systems to an ARINC 429 format for
display on the EFS
10.
The KDA 430 Gyro Adapter con-
verts information from the aircraft’s
vertical, directional and rate gyros and
internal accelerometers
to
an ARINC
429 digital format for use by the
KAM
432
Autopilot Monitor
The central part of the KFC 400’s
redundant autopilot monitoring sys-
tem, the KAM 432 monitors aircraft
movements during autopilot opera-
tions. Aircraft accelerations and pitch
and rolt attitudes and rates are
monitored
to
detect values exceeding
the maximum allowable limits deter-
mined during KFC 400 certification. In
addition the KAM 432 receives signals
from primary and trim
servos
that
enable it
to
detect trim system
malfunctions.
In event of shutdown by the Auto-
pilot Monitor, the KFC 400 cannot
be
reengaged without first successfully
completing the Flight Control Sys-
tem’s automatic preflight test routine.
To
initiate the test, cycle power to the
KCP 420 with the Autopilot Power
Switch or circuit breaker.
1
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