TruTrak ADI Pilot II - Manual (Page 3)

ADI Pilot I & II Power Up
NOTE: When powering up the autopilot ensure that the aircraft is as still as possible for 10
seconds.
The power up of the autopilot takes approximately ten seconds. During the power cycle it is very important that the aircraft be
as still as possible for the initialization of the internal gyro. While the autopilot is in the power up mode, the display will show
three flashing
(“–”) characters. If there is a GPS signal present the display will now change to read (“OFF”) . If there is not
a valid GPS signal present the display will show three non-flashing (“–”) characters. Once the aircraft achieves sufficient
groundspeed (approximately 15 knots) the display will begin showing the digital DG.
ADI Pilot I & II Basic Operation
If a valid GPS signal is present, and the autopilot is not engaged the display of the autopilot is a digital DG displaying a
gyroscopically smoothened GPS track. Once the aircraft is off the ground and at a safe altitude, the autopilot can be engaged.
There are several ways to engage the autopilot. Pressing and releasing the knob will engage the autopilot and the “AP” light
will light up. If a GPS signal is present, the autopilot will display the ground track before being engaged and will now hold the
track. If there is no GPS signal the display will show
“0” and will be in “gyro back-up” mode instead of track hold mode.
The second way to engage the autopilot is with the Control-Wheel Switch, pushing and holding the control wheel switch for
approximately 1-1/2 seconds and releasing will engage the autopilot and the “AP” light will light up.
Changing the selected track can be done two different ways. One way in which the track can be changed is to rotate the knob.
Each detent will be a one-degree change in selected track. If the knob is pushed in and rotated each detent will be a 5 degree
change in selected track. If there is no GPS signal present rotating the knob will change the selected bank angle by
approximately one-degree per detent, up to 30 degrees. The other way to change the selected track is with the Control-Wheel
Switch. Pushing and holding the Control-Wheel Switch will disengage the servo and the display on the autopilot will be a
Digital DG .While holding the Control-Wheel Switch, fly the aircraft manually to the desired track using the Digital DG
display as a reference. Upon release of the Control-Wheel Switch, the servo will re-engage and the autopilot will now fly the
new selected track. If there is no GPS signal present the Digital DG will not be displayed.
Disengaging the autopilot can be done in two different ways. Pressing and holding the knob for approximately 1-1/2 seconds
will disengage the autopilot. The second way to disengage the autopilot is with the Control-Wheel Switch. Momentarily
pushing and releasing the Control-Wheel Switch will disengage the autopilot.
ADI Pilot I & II Nav Mode Operation
When there is a flight plan present in the GPS the autopilot can follow the programmed flight plan. To enter the Nav Mode,
press and release the knob and the “NAV” light will light up. (Take care not to hold the knob for more than 1-1/2 seconds or
the autopilot will disengage.) The auto pilot will intercept the NAV track at about a 45 degree angle. The autopilot display
will now once again become a Digital DG, showing the current ground track. Pressing and releasing or rotating the knob on
the autopilot will exit the Nav Mode. When on course, 1 or 2-degree excursions are normal. When the end of the flight plan is
reached or the flight plan is cancelled on the GPS unit, the autopilot will continue flying the track it was flying when the flight
plan ended. If the flight plan has multiple waypoints, the autopilot will make the necessary turn at each waypoint. Because,
typically, the information from the GPS to the autopilot does not change until the waypoint is crossed, the autopilot will
over-fly the waypoint, and then will fly back to intercept the new course line. Some GPS units have a “turn anticipation”
feature, and if this feature is enabled on the GPS the autopilot may turn prior to reaching a given waypoint.
TruTrak Flight Systems ADI Pilot I & II Autopilot Installation Manual
December 2009 1 8300-012 Rev B