TM 1-6625-724-13&P0071 000071 00-15TASK 2 – TRACK AND BALANCE MAIN ROTOR ON GROUND 1. If any measurements are above limits, do procedure 2.1.2. If measurements are within limits, press the UP cursor to view measured values:a.) If ground lateral is 0.2 ips or below and track spread is 0.25 inches or less, press QUIT to return to theMain Menu. If tail rotor balance is known to be acceptable or previously balanced initiate task 3 FLIGHTtrack and balance.b.) If ground lateral is above 0.15 ips, further reduction should be easy and is encouraged. Press DO toexecute Diagnostics. Perform procedure 2.2.NOTEHub weights are defaulted to OFF and must be turnedon via Edit Adjustables, when needed. NOTEPitch link moves affect lateral vibration, but weightmoves do not affect track. Turning weights on and offwill not affect the magnitudes of the pitch link movessuggested. Turning pitch links on and off, on the otherhand, will affect the weight moves suggested since pitchlink adjustments also affect lateral vibration. Thereforenever ignore any undesirable pitch link move, but turnthe unwanted adjustment off, re-compute the correctionsand re-examine the predictions. If this is not done, thecorrections will in most cases be less than optimum, andthe predictions will, in all cases, be in error. PROCEDURE 2.1 PITCH LINK ONLY ADJUSTMENTSNOTETo prevent a large autorotation adjustment later duringtrack and balance, the track can be adjusted to any oneblade (i.e. designated target) by using the EDITADJUSTABLES function from the AVA diagnostic menu,toggling off the desired blade (target) to be adjusted to,and pressing DO. For example, if flat pitch torque is lessthan 15%, adjust blades up to the highest blade bytoggling off highest blade and obtaining a solution. If thetorque is between 15% and 20%, use AVArecommended default solution to adjust track to themean of the blades. If the torque is greater than 20%,adjust blades down to the lowest blade by toggling offlowest blade and obtaining a solution.a. Press DO to calculate adjustments.b. Examine the pitch link adjustments given. 1. If pitch link moves are 1 flat or more, record the indicated pitch link adjustments, go to procedure 3.2. If pitch link moves are less than 1 flat, or if no pitch link adjustments are given, press QUIT. Select ViewPredictions and press DO.a.) If measured track is less than 0.25 inch, do procedure 2.2.b.) If measured track is 0.25 inch or greater and if predicted lateral is 0.1 ips or greater, do procedure 2.3.c.) If measured track is 0.25 inch or greater and if predicted lateral is less than 0.1 ips, record the pitch linkadjustments and do procedure 3.
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