TruTrak DFC Operating Manual - Manual (Page 7)

6
lateral mode will switch from
LOC NAV
to
TRK
mode. The
selected track will be the same
as the inbound course.
The next sequential mode
is LOC/VOR REV . This refers to
flying the localizer or
VOR
in
the reverse direction. Operation
of this mode is the same as
LOC
NAV
except that there will be no
glideslope coupling.
Magnetic Back-Up
Mode
The lateral modes
previously described are based
on GPS track being present.
When GPS is lost, the DG
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 an
external heading source (HSI or
DG) is present, the
EXT HDG
mode remains functional, and if
the
GPSS
signal source is
functional, the
GPSS
mode will
also be functional. The
remaining modes,
VOR
and
LOC
navigation should not be used
when
GPS
track is absent.
Yaw Damper
(Option only)
The Yaw Damper can be
used whether or not the
autopilot is engaged. It
automatically comes on when
the autopilot is turned on.
When the autopilot is off, the
display is as shown below.
When the autopilot is not
engaged the Yaw Damper can
be toggled on or off by pressing
the [MODE] button.
TRK 000 ALT 5000
YD OFF AP OFF
Vertical Modes
When the autopilot is
engaged, it will synchronize to
the vertical speed being flown
at the time, and thus will be in
the basic vertical speed-
operating mode (see figure on
page 3). While in this basic
VS
mode, the upper right section of
the display shows altitude and
the lower right section shows
SVS (selected vertical speed).
This mode is also entered by
depressing a vertical speed
button [VS UP] or [VS DN].
If the system is in transition to a
selected altitude pressing [VS]
will switch from AIRSPEED to
VS. It will not cancel the
selected altitude
Altitude Hold Mode
Press
[ALT] once to select
ALT HOLD
entry screen, and
then press enter to activate the
altitude hold mode. The
selected altitude will be to the
nearest 100 feet as viewed on