TruTrak DFC Operating Manual - Manual (Page 4)

3
POWER UP—AIRCRAFT STATIONARY
SEE INITIALIZING THE AUTOPILOT PAGE 9
Mode and Data
Display
This display normally
shows operating modes and
associated numerical data. It is
also used to display setup mode
screens and the setting of
associated numerical data.
When displaying operating
modes, the left side shows
lateral data and the right side
shows vertical data. (See figure
below) The upper left display
labeled
TRK shows the
electronic DG slaved to GPS
track. When the GPS track is
not available
TRK will be
replaced by
MAG
, which means
the autopilot now uses an
internal source of magnetic
information for direction. The
lower left display labeled
SEL
shows the selected direction of
flight. The upper right display
shows altitude or selected
altitude, and the lower right
display shows either selected
vertical speed or selected
airspeed.
The vertical space between
the left and right hand display
area is used to show pitch trim.
This display consists of three
horizontal bars spaced
vertically as the rungs on a
ladder, and are made to move
up or down when the aircraft is
in need of being trimmed.
In the upper left where
direction is shown, a flashing
indicator is present between
TRK
or
MAG
and the numerals
that follow. When there is no
GPS position input this will be
a flashing period. Once GPS
position data becomes valid this
will be a flashing asterisk. If
GPS flight plan information is
being received over the serial
channel or if the
GPSS
option
has been added and GPS
steering information is being
received, a flashing plus sign
will indicate the presence of a
useable steering (
GPSS
mode) or
waypoint to waypoint (
GPS NAV
mode) signal.
A cursor in the form of an
underline is shown beneath the
SEL
numerals. This is used to
indicate that an underlined
number will be set by rotation
of the encoder knob.
→ ← DG SLAVED
TO TRACK INTERNAL
ALTIMETER
→ ←
↑
TRIM INDICATOR
TRK*135 ALT 4500
SEL 135 ≡ SVS 500+
SELECTED
DIRECTION SELECTED
VERTICAL SPEED