Attitude Reference Mode Of Operation; Flight Director (Fd) Mode - Honeywell KFC 150 Pilot's Manual

Attitude Reference Mode
of Operation
The system will be in the basic attitude
reference or "gyro" mode with engine(s)
running and aircraft power on, but no
modes selected (annunciator panel blank).
Aircraft heading is shown on the PNI and
roll and pitch attitude on the FCI.
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.
FLIGHT DIRECTOR (FD) MODE
The flight director mode is activated
by depressing the "FD" button on the mode
controller or the CWS button on the control
wheel. The V-bar will appear and provide
commands to maintain wings level and the
pitch attitude existing at the time of
engagement. To satisfy the V-bar com-
mand the pilot can manually fly the orange
delta wing "aircraft" into the V-bar to align
the top of the delta wing flush with the bot-
tom edge of the V-bar. Or the pilot can
engage the autopilot and let it satisfy the
commands by maneuvering the aircraft in a
similar manner.
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