0073 00TM 1-6625-724-13&P0073 00-12TASK 3-TRACK AND BALANCE MAIN ROTOR ON THE GROUNDThe 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.When using the INT-SG flight plan in the OH-58D setup file, the correct procedure is to obtain a track picture of less than0.2 inches at both 65%_NR and 35%_TQ test conditions. The diagnostics will use the main rotor pitch links to obtain atrack not greater than 0.2 inches at 65% NR and then use the outboard trim tabs to correct for less than 0.2 inches trackchange from 65%_NR to 35%_TQ. It will also give a correction to reduce fore/aft vibration at the 35%_TQ test condition.When using the INT-SG flight plan in the OH-58DM setup file, the correct procedure is to obtain a track picture of lessthan 0.2 inches at both 65%Nr and 35% TQ test conditions. The diagnostics will use the main rotor pitch links to obtaina track not greater than 0.2 inches at 65%Nr and then use the outboard trim tabs to correct for less than 0.2 inches trackchange from 65%Nr to 35% TQ. It will also give a correction to reduce fore/aft vibration at the 65%NrC test condition. PROCEDURE 1: PREPARATIONPerform task 2, Flat Track Main Rotor on the Ground.PROCEDURE 2: PERFORM INITIAL MEASUREMENTa. Press QUIT on the CADU until all selections are undefined.b. Use cursor keys to highlight Aircraft Type. Press DO.c. Select aircraft type OH-58D for aircraft without MMS and OH-58DM for those aircraft with MMS, then press DO.d. Use cursor keys to highlight Tail Number, and then 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 plan INT-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, the systemperforms a self-test of all installed equipment and readies the DAU to acquire data for that Test State (the CADU willprompt the operator with an asterisk and the test condition when all equipment is ready). Verify that the pilot is atthe required Test State (65%_NR or 35%_TQ for OH-58D aircraft with SG. 65% Nr, 65%NrC or 35% TQ forOH-58DM aircraft) and press DO again. Perform this operation each time a measurement is completed andanother Test State is highlighted. The AVA will acquire track and balance 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. Proceed to task 4.k. If measured values exceed specifications, press DO to execute diagnostics. The AVA will makerecommendations to correct track and balance using pitch change links, trim tabs, and hub balance weights. l. Shut down aircraft and perform all corrections displayed on the diagnostic screen. Check to ensure that allscreens of a multiple screen solution have been displayed. Do not use a partial set of adjustments. NOTEIt should take approximately three initial runs to get therotor in track. If after three runs the rotor track is notwithin the 0.1-0.2 inch range, review the adjustmentprocedures to make sure the correct adjustments arebeing made and re-orient the aircraft so that thetracker is not looking at the sun or that the sun is atthe left front of the aircraft. As long as the 65% and100% track are in the 0.1-inch range (2-3 mm) it isacceptable to discontinue the initial mode and pressinto flight if problems are being encountered gettingthe 65% balance acceptable.m. After corrections are installed, repeat procedure 2 until ground track and balance criteria are met.n. Proceed to task 4.
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