TruTrak Digiflight Operation Manual - Manual (Page 7)

6
display is slaved to a magnetic
heading source contained
within the programmer and
TRK
is replaced with
MAG
. This
magnetic mode is only a backup
and would seldom be needed;
however, it does provide a
means of selecting and
maintaining a drift-free
direction of flight. If the
GPS-S-
signal source is functional, the
GPS-S-
mode will remain
functional.
Gyro Set
When the initializing has
been done correctly, the gyros
should already be centere d at
the time of take off. If
confirmation of this is desired,
with the aircraft stationary on
the runway and the autopilot
disengaged, pressing and
holding the encoder knob will
put the gyros in the fast
centering mode. The knob
should be depressed for
approximately 7 seconds during
which time the words
GYRO SET
will be displayed.
Power Loss
If there is a momentary
loss of electrical power, the
autopilot will disengage. The
autopilot gyros must now be
manually re-initialized using
the
GYRO SET
operation.
Manually fly the aircraft in a
straight line as steadily as
possible, while holding in the
knob for at least ten seconds
after the words
GYRO SET
appear in the display. After
approximately ten seconds have
elapsed, release the knob. The
autopilot may now be re-
engaged, and any residual gyro
offset will be slaved away
automatically.
Digiflight 200
Lateral Modes
Upon being engaged, the
autopilot will be in the basic
lateral mode, and it will be
synchronized to the direction
being flown at the time. The
number following
SEL
(Selected
direction) is underlined,
meaning that rotation of the
encoder will select heading.
Rotation of the knob when it is
not depressed will cause 5
°
steps of
SEL
and when it is
depressed the steps will be 1
°
.
If a GPS flight plan has
been entered into the GPS,
pushing the small button to the
left of the display will engage
the
GPS NAV
mode and a
flashing plus sign will show. In
the
GPS NAV
mode, the autopilot
will follow a flight plan
TRK*135
SEL 135 AP ON
MAG*180
GYRO SET