TM 1-6625-724-13&P0071 000071 00-7TASK 1 – TEST EQUIPMENT INSTALLATION/CHECKOUTNOTEIt is strongly recommended that the AVA diagnosticsolutions for the main rotor be made, using the externallymounted accelerometers, along with AH64NB/AH64D2script files. Errors due to faulty on-board accelerometers,faulty SPU’s, and/or poor SPU/AVA interface can make thetrack and balance exercise ineffective. NOTEFor main rotor track and balance, if the external wiring ofaccelerometers method has been used, (task 1 procedure 3)ensure that the lateral accelerometer at the pilot station andthe vertical accelerometer at the CPG station have beenproperly oriented. Improper orientation will cause the CADUto suggest improper adjustments. The lateral accelerometershould be oriented identically to the on-board lateralaccelerometer, with the connector and cable pointing to thepilot’s right. The vertical accelerometer should be orientedidentically to the on-board one with the connector pointingdown. See figures 3 and 4. Also ensure that thelateralaccelerometer in the pilot station has been connected toDAU receptacle ACC1 and the vertical accelerometer hasbeen connected to ACC2. Improper connection ofaccelerometers will cause the CADU to suggest improperadjustments causing the rotor to become rougher.a. Remove AVA blade tracking equipment from transport case. Check for possible damaged equipment andfrayed cables.b. Install DAU in the canvas carrying case.c. On AH-64D helicopters remove soundproofing that covers the interior opening of the fuselage through holelocated to the left of the CPG seat.d. On AH-64D helicopters remove the 5L90 cover plate located on the outside of the aircraft below the CPGwindow and aft of the UTD mounting point.e. Route the UTD cable (29325701) through fuselage hole. Connect the UTD cable (29325701) to DAUconnector labeled TRACKER 1.f. Place DAU on the left outboard side of the copilot's armor plate oriented such that the on/off switch is forward,with connectors facing up and secure DAU using canvas straps and D-rings. See figure 2.NOTEIn order to prevent possible false indications on the AH-64tail rotor gearbox indicator, the AVA AH-64 umbilical cablepart number 29304600 should be modified. Perform acontinuity check on the connections between pins 17, 28 and12 on P1 to pins K, L and C on P4, respectively. If there iscontinuity, the cable must be modified using the followingprocedure: remove two screws from connector P4(MS3116J14) backshell clamp. Unscrew backshell and pullback backshell and sleeve to expose wire connections.Desolder the wires from pins C, K and L and apply heatshrink tubing to wire ends. Replace sleeve, backshell andclamp. With a permanent marker, strike out the revisionletter located on the cable ID tag immediately after the partnumber. Mark tag with the letter “D”. Cable ID tag shouldread: “29304600 D”.
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