0071 00TM 1-6625-724-13&P0071 00-4FLIGHTMinimizes main rotor lateral vibration during ground/hover and vertical vibration at 60, 80, 100, 120 and 140 Knots.Secondary emphasis is placed on minimizing ground, hover and forward flight track spread. As default, thediagnostics will use pitch links to influence ground/hover lateral vibration/track and forward flight verticalvibration/track. Trim tabs are used to influence forward flight vertical vibration/track. Weights must be manuallyturned on using (Edit Adjustables) to influence ground/hover lateral vibration and forward flight vertical vibration.Success depends upon having a good GROUND track and balance starting point.GROUND Minimizes both main rotor track and lateral vibration at 100% (101% for AH-64D) Nr flat pitch (full down collective)using main rotor pitch links and weights. Weights are turned OFF as default and must be manually turned on (EditAdjustables) as necessary to achieve good ground balance. If the aircraft is already in service and the operatordesires to improve the vibration levels do not perform the GROUND task.PROBES Acquires data from up to four accelerometers (in addition to the two on-board track and balance accelerometers) toassist in isolating irregular or unusual vibrations.tailMinimizes tail rotor vibration on the ground with main rotor at 100% (101%for AH-64D) Nr flat pitch using tail rotorblade tip weights. Also requires installation of the accelerometer, accelerometer cable, and optical rpm sensor withaccompanying blade reflective tape. For this measurement, the tail rotor accelerometer is connected to DAUreceptacle “ACC4” and the optical tachometer cable to DAU receptacle “TACHO2”. tail70Same as tail, but for flat pitch on ground at 70% Nr. This flight plan should be used for tail rotor balance whenever tailrotor vibration levels preclude safe rotor operation at 100% (101% for AH-64D) Nr. The AVA will give a correctionbased on sensitivity coefficients for the 70% condition. Further iteration at 70% may be necessary until 100% (101%for AH-64D) can be safely achieved, however, it is not necessary to minimize vibration at 70% before attempting100% (101% for AH-64D).GENERAL GUIDELINESThe last page of this appendix gives general guidelines for AH-64 track and balance for the GROUND and FLIGHTflight plans in a single page. It is intended as a refresher for the experienced user who has previously read andunderstood the detailed contents, which follow. The inexperienced operator should read and understand the moredetailed text of the main body of this document before relying on the brief general guidelines contained at the end ofthis work package.
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