0069 00TM 1-6625-724-13&P0069 00-38TASK 9 - ENGINE OUTPUT SHAFT BALANCINGThe following procedures provide instructions for the balancing of the engine output shafts of the UH-60L/UH-60A/EH-60A helicopters with shaft balance assembly installed using the AVA equipment.PROCEDURE 1: CHECK BALANCEa.Perform task 8, procedures 1 and 2: Equipment Installation (omit oil cooler connection if oil cooler assembly isnot to be tested).NOTEMake sure all cables are secure on helicopter usingtiedown straps per Appendix D of TM 1-1520-237-23.b.Perform task 8, procedure 3: Engine Output Shafts and Oil Cooler Testing (disregard all references to the oilcooler if the oil cooler assembly is not to be tested).c.Vibration levels shall be 0.50 ips or less. If vibration levels are within this range, engine output shaft isbalanced. Remove accelerometers, cables, and brackets from the input modules. If vibration level is between0.5 and 2.0 ips, balance engine output shaft in accordance with the following procedure. If vibration level isgreater than 2.0 ips, replace output shaft using procedures in TM 1-1520-237-23.Figure 22. Engine Output Shaft Balance Bolt ConfigurationPROCEDURE 2: OPTICAL TACHOMETER SENSOR INSTALLATIONa.Turn off all electrical power.b.Open engine cowling.c.Remove engine air inlet (refer to TM 1-1520-237-23).d.Remove crotch assembly from engine (refer to TM 1-1520-237-23).
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