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'zr-
4
Attitude Reference Mode
Of ODeration
The system will be in the basic attitude
reference or "gyro" mode with engine(s) run-
ning and aircraft power on, but no modes
selected (annunciator panel blank). Aircraft
heading is shown on the KG 107 and pitch
and roll attitude on the KG 258 Horizon
Reference Indicator. (When the optional KI
525A PNI is installed in place of the KG
107, aircraft heading will be shown on the
KI 525A.)
Attitude Gyro Operation Note: When
shutting down the aircraft for short periods
of time, make sure the Attitude Gyro has
completely spun down before starting oper-
ations again. Gyro spin down occurs when
the air supply is cut off to the gyro and usu-
ally takes about 10 minutes.
During Gyro spin down most gyros
have a tendency to 'tilt" (precess) to one
side.
If
the air supply is reapplied to the
gyro while in this state, slow gyro erection
(leveling) will occur due to gyro inertia. If
aircraft operations are initiated before the
gyro is fully erected, there is a greater pos-
sibility that the gyro may tumble causing
loss of primary attitude information from the
Attitude Gyro.
AF
AUTOPILOT (AP) MODE
NOTE:
The autopilot cannot be engaged
and used after power has been applied to
the system until the system self-test has
been performed.
The autopilot provides single axis (roll)
stabilization as well as automatic response
to all selected autopilot modes.
On initial engagement, with no other
autopilot modes selected on the KC 190,
the KAP 100 will fly the aircraft wings level.
Warning: Whenever the autopilot is disen-
gaged, the
AP
legend on the annunciator
panel will flash and an aural tone will sound
to alert the pilot.
NOTE: For system limitations refer to the
Flight Manual Supplement for your particu-
lar aircraft.
67
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