Trio Pro Pilot Manual 4.1
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In such case, after approximately 7 seconds without signal
the Pro Pilot displays the
NO GPS
message.
Since the Pro Pilot is no longer able to provide the navigation function, the
ROTARY ENCODER
can be
used to control the aircraft turn rate, or to correct for gyro drift to effect a straight ahead flight path
The Pro Pilot servo is still engaged so the aircraft is being controlled in the “wing leveler” mode (aircraft
roll stabilization). Without the GPS signal, the Pro Pilot solid-state gyro lacks a precise external
reference and after several minutes may begin a slow change in heading due to gyro drift. In order to
change the heading slightly to stop the drift, the pilot needs to monitor the compass heading and rotate
the
ENCODER
either left or right to maintain the desired heading.
Course Mode Example
As the flight progresses the destination, Class B
airspace is entered after getting the appropriate
clearances.
Flying along on the pre-selected
010 degree
TRK
,
Approach Control requests “Turn right 30 degrees for
clearance from other traffic.”
This turn can be accomplished in one of two ways:
1. The
CRS
mode is selected
by pressing the
MODE
pushbutton momentarily. The following
changes in the display are noted:
The
TRK
LED extinguishes, the
CRS
LED
is illuminated
The
BTW
field changes to
CRS
The
TRK
field changes to
<010
The
CRS
and
TRK
fields are, for the
moment, identical (010)
Since the controller wants 040 degrees
(formerly 010
degrees), a 30 degree turn to the right is needed. The
desired
CRS
is 040 degrees
so the
ROTARY
ENCODER
is turned clockwise until 040 is displayed
as the
CRS
value. The Pro Pilot turns the airplane
until both the track (
TRK
) and the course (
CRS
) are
the same (
040
).