TM 1-6625-724-13&P0071 000071 00-13TASK 2 - TRACK AND BALANCE MAIN ROTOR ON GROUNDThe purpose of main rotor adjustments made at flat pitch (full down collective) and 100% (101% for (AH-64D) Nr is toestablish a good starting point for forward flight track and balance and should normally be accomplished prior toinitiating FLIGHT track and balance. Flight Plan GROUND will provide both weight and pitch link corrections for thispurpose.NOTEIf it is anticipated that the rotor track and balance has notbeen disturbed (i.e., track and balance is being performedto verify that nothing has changed), and if ground track iswithin 1.5 inches between high to low blade and groundbalance is 0.2 ips or less, proceed directly to flight. Ifflight measurements are significantly above limits,perform GROUND test plan. If flight states require onlyfine-tuning adjustments, skip GROUND test plan. NOTETail rotor balance should be accomplished before any in-flight checks are performed. The tail rotor balanceprocedure can be performed during a main rotor groundrun. Ground Track and Balance LimitsThe AVA will show the following limits for ground track and lateral vibration:Track: 0.25 inch between high blade to low bladeLateral Vibration:0.20 ipsNOTEIt should be possible to achieve ground balance below0.1 ips and it is encouraged to do so. Ground tracksignificantly below 0.25 inch is not justified.PROCEDURE 1: PERFORM GROUND MEASUREMENTa. Operate aircraft. NOTEIf vibration is too severe to bring rotor speed up to fulloperating rpm, hold rotor speed steady at the highestrotor speed that can be safely sustained for the first AVAmeasurement.b. Power up DAU. c. Wait approximately 10 seconds and power up CADU.d. Press QUIT on CADU until the Main Menu appears.e. Cursor up to highlight "Aircraft Type" and press DO. Cursor to highlight the appropriate aircraft type (AH64_R orAH64D_R for on-board accelerometers or AH64NB_R or AH64D2_R for externally mounted accelerometers) andpress DO. f. On the Main Menu, cursor to highlight tail number and press DO. Select tail number from the list, or highlightNEW and press DO to input a new tail number, (up to 7 digits) using the number keypad. When done, press DO.
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