TM 1-6625-724-13&P0070 000070 00-13TASK 4 - TRACK MAIN ROTOR IN FIGHTCAUTIONIf tail rotor requires balancing, task 5 (Balance TailRotor) should be accomplished before flight.Main rotor in-flight vertical tracking should be performed when any of the following occurs:• 1/REV in-flight vertical vibration is unacceptable.• Changes have been made to the track of one or more main rotor blades as a result of performing ground trackingadjustments. See task 2.PROCEDURE 1: EQUIPMENT INSTALLATIONNOTEAircraft ground track and balance specified requirements(tasks 2 and 3) are to be completed prior to performingin-flight Test States.a. Install test equipment (refer to task 1). b. Turn on DAU. c. Turn on CADU.PROCEDURE 2: PERFORM FLIGHT MEASUREMENTSa. 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 aircraft type based on table 2, 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 characters), 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. Re-verify that the aircraft is at the requiredTest State (FPG100, Hover, 100K, 120K, 135K, CLIMB, or L/DOWN) and press DO again. Perform thisoperation each time a measurement is completed and another Test State is highlighted. The AVA will acquiretrack and vibration data at each Test State and then return to the selection menu.j. After the last measurement is completed, press DO on Finish, then press DO on Diagnostics. If measurementsare within specified limits, press QUIT to Main Menu and go to step o.k. If measured values exceed specifications, press DO to calculate a solution. Evaluate the improvementsobtainable through recommended corrections. Perform corrections as shown, ensuring that you display allscreens of a multiple screen solution.
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