TM 1-6625-724-13&P0069 000069 00-41/(0069 00-42 blank)TASK 10 - ISOLATING IRREGULAR/UNUSUAL VIBRATIONSPROCEDURE 1: EQUIPMENTINSTALLATIONa.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 left or right crew seat with connectors facing up and secure DAU using aircraft shoulder and lapbelts and canvas strap D-rings. If no seats are installed, the DAU may be secured to the D-rings found on theaircraft cabin floor.d.Connect power cable (29104700) to aircraft's 28 Vdc utility receptacle at station 293, right side, on cabinceiling and to DAU receptacle marked 28 Vdc.e.Place 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.a.Mount/install accelerometer (28110900) (found in the basic kit) anywhere on the airframe that an irregular orunusual vibration is detected.b.Connect accelerometer cables (found in the basic kit) from accelerometer to the DAU receptacle markedACC1, ACC2, ACC3, and/or ACC4.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, then press DO.f.Use cursor keys to highlight UH-60, 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. Verify that Test State ACC1 is highlighted.l.Press DO when the aircraft is stable at the highlighted selection. Verify that the aircraft is at the required TestState (ACC1, ACC2, ACC3, or ACC4) and press DO again. The flight plan will measure data on one channelat a time. Perform this operation each time a measurement is completed and another Test State ishighlighted. The AVA will acquire vibration data at each selected Test State and then return to the selectionmenu.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 then press DO. Review each of thespectrums measured for any unusual vibrations.o. Make appropriate logbook entry if necessary and remove test equipment.END OF WORK PACKAGE
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