TM 1-6625-724-13&P0073 000073 00-13TASK 4 - TRACK MAIN ROTOR IN FLIGHTPROCEDURE 1: EQUIPMENT INSTALLATIONThe preferred method of tracking the OH-58D is tracking it with the MMS installed. Removing the sight and workingthe rotor until smooth and then reinstalling the sight is considered an obsolete method and could result in highvibration levels at idle RPM when the sight is reinstalled. Working the rotor with the sight installed and using the OH-58DM script file will preclude from having high vibration levels at idle RPM.NOTEAircraft ground track and balance specified requirements(tasks 2 and 3) are to be completed prior to performingin-flight Test States, unless aircraft is already in service.a. Install test equipment (refer to task 1). b. Operate aircraft at appropriate rotor speed (see table 1 or table 2). c. Turn on DAU. d. Turn on CADU.PROCEDURE 2: PERFORM FLIGHT MEASUREMENT a. Press QUIT on the CADU until all selections are undefined. b. Use cursor keys to highlight Aircraft Type. Press DO.c. Select OH-58D for aircraft without MMS and OH-58DM for those aircraft with MMS, 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 plan FLI-SG. Press DO.h. Enter the Measure mode by pressing F1. i. Press DO when the aircraft is stable at the highlighted selection. The first time the DO key is pressed, thesystem performs a self-test of all installed equipment and readies the DAU to acquire data for that Test State(the CADU will prompt the operator with an asterisk and test condition when all equipment is ready). Reverifythat the pilot is at the required Test State (65% NR, 35% TQ, Hover, 60K, 100K, 110K, and L/DOWN forOH-58D aircraft or 65%NRC, 35% TQ, Hover, 60K, 100K, 110K, and L/DOWN for OH-58DM aircraft) andpress DO again. Perform this operation each time a measurement is completed and another Test State ishighlighted. The AVA will acquire track data and return to the selection menu.j. After the last measurement is completed, press DO on Finish, then press DO on Diagnostics. Ifmeasurements are within specified limits, press QUIT to Main Menu, then proceed to step p.WARNINGIf Main Rotor RPM cannot be maintained in thenormal operating range, terminate test flight.k. Perform autorotational check as per TM 55-1520-248-MTF.l. If measured values exceed specifications, press DO to execute diagnostics. AVA will make recommendationsto correct track and balance using trim tabs, and hub balance weights. Shut down aircraft and makecorrections.
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