TM 1-6625-724-13&P0069 000069 00-15TASK 4 - MAIN ROTOR ROLL/VERTICAL IN-FLIGHT TUNINGCAUTIONIf tail rotor requires balancing, task 6 (Balance TailRotor) should be accomplished before flight.Main rotor in-flight roll/vertical tuning should be performed when any of the following occur:Main rotor 1/REV (258 RPM) in-flight vibration is unacceptable.Main rotor maintenance was done and ground flat pitch tracking was performed, see task 2.PROCEDURE 1: EQUIPMENT INSTALLATIONNOTEIf major maintenance has been accomplished thatrequires rotor smoothing, tasks 2 & 3 should beaccomplished prior to starting this task. If nomaintenance has been previously accomplished thenstart at task 4.a.Install test equipment, see task 1.b.Turn on DAU.c.Turn on CADU.PROCEDURE 2: PERFORM FLIGHT MEASUREMENTa.Press QUIT on the CADU until all selections are undefined.b.Use cursor keys to highlight Aircraft Type, then press DO.c.Use cursor keys to highlight UH-60, and then press DO.d.Tail Number is highlighted. Press DO.e.Use cursor keys to highlight a tail number or enter a new tail number (up to seven digits), then press DO.f.Flight Plan is highlighted. Press DO.g.Use cursor keys to highlight FLIGHT. Press DO.h.Enter the Measure mode by pressing F1. Verify that Test State FPG100 is highlighted.WARNINGIf main rotor 1/REV vibration becomes objectionable,acquire data normally through the highest airspeedat which vibration can be tolerated. Do not skip testconditions, data should be taken from ground to thehighest airspeed possible. After data is taken at thehighest speed achieved, press QUIT then highlight“Save and Exit” and then press DO. Land theaircraft and perform corrections suggested by theCADU prior to further flight.i.Press DO when the aircraft is stable at the highlighted selection. Verify that the aircraft is at the required TestState (FPG100, Hover, 80 Kts, 120 Kts, or 145 Kts) and press DO again. Perform this operation each time a
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