TM 1-6625-724-13&P0069 000069 00-33TASK 8 – 100 HOUR ENGINE OUTPUT SHAFT AND OIL COOLER VIBRATION TESTINGThe following procedures provide instructions for the balance testing and balancing of the engine output shafts andvibration testing of the oil cooler for the UH-60 helicopters using the AVA equipment.PROCEDURE 1: EQUIPMENT INSTALLATIONa.Remove AVA vibration test equipment from transport case. Check for possible damaged equipment andfrayed cables.b.Install DAU in canvas carrying case.c.Place DAU on right troop seat with connectors facing up and secure DAU using aircraft shoulder and lap beltsand canvas strap D-rings. If no troop 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 INSTALLATIONa.On each input module, remove one nut at rear and down from lifting ring. (Not required on aircraft modifiedwith accelerometer block installed). See figures 19 and 20.b. Install accelerometer (28110900) on accelerometer bracket, or block if installed. Mount accelerometer bracketto input module with accelerometer vertical to input module (connector end facing up). Reinstall nut andTORQUE TO 260 - 289 INCH-POUNDS. Do this for both modules.c.Connect accelerometer cables to accelerometers and route cables over top of input module, under cowl, underforward edge of engine air inlet (if installed), through tiedown ring, and in window. Do this for both modules.d.Connect accelerometer cable from left input module (No. 1) to the DAU receptacle marked ACC1, andaccelerometer cable from right input module (No. 2) to the DAU receptacle marked ACC2.Figure 19. No. 1 Input Module Accelerometer Installation (ACC1)
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