Trio Avionics Pro Pilot - Manual (Page 30)

Trio Pro Pilot Manual 3.8
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2. PCS mode (see page 31) is invoked by pressing and holding the Remote Servo Disconnect
switch and manually flying the aircraft to the desired ground track, releasing the switch when the
proper ground track is achieved.
The illustration on the right now shows that the aircraft has turned right and is presently 1.08 miles to the
right of course. A few minutes later, Approach advises to “resume normal navigation.”
There are two ways to use the autopilot to return to the original desired track (DTK).
1. The intercept mode (INT) may be used to return to the original preprogrammed route via a
default 25 degree intercept angle, or a pilot adjusted intercept angle.
2. Going directly back to the TRK mode causes the aircraft to more gradually curve back to the
DTK.
Alternatively, the pilot may choose to enter a “Direct” command into the GPS system, thus proceeding
directly to the next waypoint rather than intercepting the original desired track (DTK).
NOTE: If a GOTO waypoint is selected the autopilot will automatically switch to the TRK mode since the
cross track error will be zero.
Intercept Mode Example
Assume that, while in the CRS mode, the aircraft flew 5.1 miles right of the courseline (DTK), as shown
on the display’s cross track (XTK) field. Also assume that the computed intercept boundary switch point
is 1.0 miles. The intercept (INT) mode is selected
by pressing the H MODE switch. The CRS LED
extinguishes, and the INT LED illuminates and flashes at the configured flash rate. The following
changes are present on the display:
The XTK label changes to intercept distance (IDS) and the
value in the IDS field is 4.1 miles. This display indicates that
you are in the intercept mode, correcting to the left and you
are 4.1 miles from the switch point back to the TRK mode.
The CRS label changes to INT and the value in the INT field is about 25 degrees to the left of the current
desired track. The Pro Pilot selects a 25 degree intercept angle automatically.
The aircraft now turns left to the ground track commanded in the INT field. The IDS value steadily
decreases toward zero. After a short interval the TRK and INT values are approximately
the same,
indicating a steady intercept track.
If it is desired to change the default intercept angle (25 degrees), the pilot may engage the PCS MODE
by pressing and holding down the Remote Servo Disconnect switch on the stick (or yoke) and flying the
aircraft manually to the desired intercept course at which time the switch is released. Releasing the
switch locks the new ground track as the desired intercept angle.
The ROTARY ENCODER may also be used
to change the intercept angle (INT field) while in the INT
mode. In the event that the XTK error is not decreasing in the INT mode (perhaps if an inappropriate
intercept angle has been selected) the INT field will flash to signify the selected commanded angle will
not allow an intercept.
Progressing toward the DTK, as the IDS value approaches 0.0 the Pro Pilot switches automatically from
the INT mode to the TRK mode when the aircraft is 1.0 miles right of the DTK. The Pro Pilot now is
turning the airplane back to the right slightly and the XTK is approaching 0.00. The Pro Pilot will now re-
establish the airplane back on the DTK headed directly toward the programmed waypoint.