TruTrak ADI - Manual (Page 4)

ADI Installation
Power and ground connections can be made using 22 gage wire with a 2 amp circuit breaker between the avionics buss
and the ADI.
When the unit is purchased in its basic form, the instrument uses the serial output from a GPS (RS-232) for the DG
display. The DG will not display a heading until a ground speed of 5 to 10 knots is achieved.
When the unit contains the built-in GPS receiver, it is only necessary to connect the remote antenna and place the
antenna in view of the sky. On the initial start up it could take up to 15 to 30 minutes to find the satellites, after the
initial startup the GPS will find the satellites in about 5 min the center bar will flash after start up until the GPS receiver
finds the satellites. Then the bar will stop flashing and become steady, at this time the internal GPS is ready for flight.
The internal lighting feature is connected to the instrument panel light bus. The LED will dim to the lowest setting with
a low voltage on the dimmer wire. Confirm that the dimmer system drops to 0 volts when off or the display may stay
very dim and be hard to see in sunlight. The internal lighting is internally grounded.
Apart from the electrical connections, there are standard 1/8” pipe thread receptacles for both pitot and static lines.
Correct tightening is accomplished by starting the adapter by hand until unable to turn, then tightening ½ turn more with
a wrench. Unless the aircraft is pressurized, there is no need to connect the static
line. The airspeed signal is required for the attitude display to function correctly.
Also, it is there to provide the low airspeed warning. This warning is in the form
of the flashing letters “A-S” alternating with the DG number on the DG display
when the airspeed falls below the best rate of climb speed or whatever speed the
owner might choose. Setting of this air speed warning requires a flat blade
screwdriver small enough (approx. ⅛ shaft, tool provided) through the 6-32
female thread. The correct screw driver is provided with the unit.
The lower right instrument screw is removed to gain access to the airspeed
adjustment screw. The procedure for setting the airspeed warning is to fly the
aircraft at the best rate of climb speed (which is also the best glide speed and
attitude sustaining airspeed) or whatever speed suits the owner. While holding
this speed, rotate the adjustment so the flashing “A-S” just appears.
Mounting of the ADI is not angle sensitive as long as the tilt is not more than 10 degrees in any direction, so no
shimming is needed for panel tilt compensation. The mounting screws are 6-32 thread with a maximum length of 3/8”.
Brass screws are preferred.
3 1/8” ADI 3.4”H x 3.4”W x 4.6”D 12-28 volts - Weight - 14 oz
2 ¼” ADI 2.5”H x 2.5”W x 6.7”D 12-28 volts - Weight - 13 oz
ADI Backup Battery & Servicing
Switch label should state, “ADI BACKUP POWER” normally on the switch side that engages the battery
The servicing of the ADI backup battery is simply a matter of inspection of the functionality and confirming charge and
discharge rates.
Recommendation of a function test during the pre-takeoff checklist to confirm the LED switch illuminates with
activation of the backup battery. The ADI should function normally in this mode. Once it has been verified that the
backup battery is properly functioning, return the switch to the normal position.
Once a year a complete function test of the backup battery system is recommended:
Activate the ADI backup battery and confirm LED is illuminated. Continue in this mode, note the time of
activation and confirm minimum one hour function of the ADI.
If function time is less than one hour then remove backup battery and charge on the bench for a minimum of eight hours
and retry function test above.
TruTrak Flight System 2 ADI Flight Instrument Installation Manual
December 2009 8300-016 Rev B