1. Connecting Aircraft Power
Failure to correctly connect the dc power cable can
result in personnel injury. Observe polarities when
connecting the dc power cable.
If dc input power is reversed, allowing any portion of
the AVA system to touch the airframe can cause
damage to the AVA.
Install cable connecting the CADU to the DAU prior
to connecting external power.
Figure 1. AVA System Interconnect
The AVA requires 18 to 36 Vdc power at about 1.5 amps to operate. The polarity of the input power is
important. Connect the positive (+) supply rail to pin B on the DAU power input connector and connect
ground to pin A. An aircraft power cable is provided in the AVA basic kit, and aircraft specific power cable
adapters are in each accessory kit if a different connection is required.
For aircraft with compatible circular power connectors, simply install the cable between the DAU and the
aircraft power receptacle. For some aircraft this is not available, and the small interface cable must be
used. Typically a map light socket or other source of power can be found which is capable of powering
SERIAL PORT (RS232)
TACHO 1 (MAIN ROTOR)
TACHO 2 (TAIL ROTOR, HIGH SPEED SHAFT)
MULTI-CHANNEL (AH-64A/D, CH-47D)
DAU to CADU Cable
DAU to UTD Cable