TM 1-6625-724-13&P0071 000071 00-25TASK 3 - TRACK AND BALANCE MAIN ROTOR IN FLIGHTPROCEDURE 4: VERIFY / REPEAT a. Make the recorded AVA-recommended adjustments. For AH-64A, perform pitch link adjustments according to theinstructions in task 2 procedure 4 and perform trim tab adjustments according to procedure 5 below. For the AH-64D, perform pitch link and trim tab adjustments as per the Longbow IETM, TM 1-1520-LONGBOW/APACHE.b. Perform limited test flight, including autorotational RPM check per TM 1-1520-238-MTF. Repeat diagnostics/corrections as necessary until all vibrations are within limits.NOTEIf trim tab pockets are not marked or to verify tab pocketmarking, for AH-64A refer to TM 1-1520-238-23 and AH-64D to IETM TM 1-1520-LONGBOW/APACHE.PROCEDURE 5: TRIM TAB ADJUSTMENTa. The tab bend corrections called out on the diagnostics display will refer to the start point of a continuous bend.Example: If the AVA recommends 1 degree up at pocket 4-10, the bend should start at pocket 4 and continuethrough pocket 10.CAUTIONPlace tab adjustment tool in the center of the tabbend pocket that is to be bent. See figure 10.Tab tracking locations (0 through 10) are 10 inchesin length, starting six inches inboard of swept tip.Do not bend inboard of pocket 10. See figure 11.Do not make bends in opposite directions inadjacent pockets. It is preferable to remove anupward bend (reset to zero degrees) if the adjacentpocket requires a downward bend.Any noticeable deformity (kinks or sharp edgescaused by the tab bending tool) is cause forrejection of the blade.It is preferable to make two 1-degree bends inadjacent stations rather than one 2-degree bend inone station.b. Perform tab adjustments on blades and pockets called out in the AVA diagnostics.c. Remove tab adjustment tools and perform limited test flight as prescribed by procedure 4above.
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