0072 00TM 1-6625-724-13&P0072 00-16TASK 6 - ISOLATING IRREGULAR/UNUSUAL VIBRATIONSPROCEDURE 1: EQUIPMENT INSTALLATIONa. Remove AVA equipment from transport case. Check for possible damaged equipment and frayed cables.b. Install DAU in canvas carrying case.c. Place DAU in a back seat with the connectors facing up and secure using aircraft shoulder and lap belts andcanvas straps.d. Connect the DC power cable (29104700) to the aircraft power receptacle in the overhead panel and to the DAUreceptacle marked 28 Vdc.e. Locate CADU in aircraft. Connect CADU to DAU cable (29325601) to CADU and to DAU receptacle markedCADU.PROCEDURE 2: ACCELEROMETER INSTALLATIONNOTEData can be acquired from up to four accelerometers toassist in isolating Irregular or unusual vibrations.Operator must denote orientation and location of eachaccelerometer.a. Mount/install accelerometer (28110900) (found in the basic kit) anywhere on the airframe that an irregular orunusual vibration is detected.b. Connect accelerometer cable (29105800) (found in the basic kit) from accelerometer to the DAU receptaclemarked ACC1, ACC2, ACC3, and/or ACC4. The flight plan will measure data on one channel at a time.PROCEDURE 3: PERFORM PROBES MEASUREMENTSa. Operate aircraft at desired flight condition. This should be the RPM or airspeed at which the vibration isstrongest.b. Turn on DAU.c. Turn on CADU.d. Press QUIT on the CADU until all selections are undefined.e. Use cursor keys to highlight Aircraft Type, and then press DO.f. Use cursor keys to highlight OH-58A/C, and then press DO.g. Tail Number is highlighted. Press DO.h. Use cursor keys to highlight a tail number or enter a new tail number (up to seven digits), then press DO.i. Flight Plan is highlighted. Press DO.j. Use cursor keys to highlight PROBES. Press DO.k. Enter the MEASURE mode by pressing F1. Verity that Test State ACC1 is highlighted.l. Press DO when the aircraft is stable at the highlighted selection. Re-verify that the aircraft is at the requiredTest State (ACC1, ACC2, ACC3, or ACC4) and press DO again. The flight plan will measure data on onechannel at a time. Perform this operation each time a measurement is completed and another Test State to bemeasured is highlighted. The AVA will acquire vibration data at each selected Test State and then return tothe selection menu.m. After the last measurement is completed, press DO on Finish, then press DO on Main Menu.n. Enter the Display mode by pressing F2. Select One Test State and press DO. Review each of the spectrumsmeasured for any unusual vibrations.o. Make corrections and repeat task 6.p. Make appropriate logbook entry and remove test equipment.END OF WORK PACKAGE
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