TM 1-6625-724-13&P0006 000006 00-31. Connecting Aircraft PowerWARNINGFailure to correctly connect the dc power cable canresult in personnel injury. Observe polarities whenconnecting the dc power cable.CAUTIONIf dc input power is reversed, allowing any portion ofthe AVA system to touch the airframe can causedamage to the AVA.CAUTIONInstall cable connecting the CADU to the DAU priorto connecting external power.Figure 1. AVA System InterconnectThe AVA requires 18 to 36 Vdc power at about 1.5 amps to operate. The polarity of the input power isimportant. Connect the positive (+) supply rail to pin B on the DAU power input connector and connectground to pin A. An aircraft power cable is provided in the AVA basic kit, and aircraft specific power cableadapters 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 theaircraft power receptacle. For some aircraft this is not available, and the small interface cable must beused. Typically a map light socket or other source of power can be found which is capable of poweringSERIAL PORT (RS232)PARALLEL PORTSTROBE+28 VDCTACHO 1 (MAIN ROTOR)ACC 3ACC 1ACC 2ACC 4TACHO 2 (TAIL ROTOR, HIGH SPEED SHAFT)MULTI-CHANNEL (AH-64A/D, CH-47D)DAU to CADU CableDAU to UTD Cable
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