0071 00TM 1-6625-724-13&P0071 00-18TASK 3 - TRACK AND BALANCE MAIN ROTOR IN FLIGHTMain rotor FLIGHT track and balance should be performed when any of the following occurs:a. In-flight vertical vibration is unacceptable.b. Changes have been made to the track of one or more main rotor blades as a result of performing groundtracking.c. Repairs have been made to one or more main rotor blades.d. One or more main rotor blades have been removed and reinstalled or replaced.e. In accordance with IETM instructions TM 1-1520-LONGBOW/APACHE (AH-64D) or TM 1-1520-238-23 (AH-64A).WARNINGVibration levels (vertical or lateral) of 1.2 ips andabove may cause aircraft damage. Avoid flying theaircraft with these levels.WARNINGAvoid flying the aircraft with track spreads (high tolow blade) of 3 inches or more.Flight Track and Vibration LimitsThe AVA will show the following flight track and vibration limits:Lateral Vibration on Ground:0.20 ipsLateral Vibration in Hover:0.20 ipsVertical Vibration in Forward Flight:0.30 ipsGround and Hover Track: 1.5 inch high blade to low bladeForward Flight Track: 2.0 inch high blade to low bladeNOTEIt should be possible to obtain aircraft vibration withinthese limits with a reasonable number of adjustment sets(i.e., flights). Inability to do so may be a symptom of amaintenance problem or a problem with AVAequipment/installation.PROCEDURE 1: EQUIPMENT INSTALLATIONa. Install test equipment (refer to task 1).b. Turn DAU ON.c. Turn CADU ON.PROCEDURE 2: PERFORM FORWARD FLIGHT MEASUREMENTa. Press QUIT until the Main Menu appears.b. Verify that aircraft type and tail number are as desired. Highlight Flight Plan and press DO. FLIGHT ishighlighted. Press DO.c. Press F1 Measure.d. On the measurement screen, press F4 to toggle from LIMITS OFF to LIMITS ON. NOTE: Selection will stayselected as long as measurements are occurring in the current flight ID. Once the measurement screen is exited,LIMITS will reset to OFF.
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