AVA APPLICATION AND PROCEDURES AH-64A/D CONT.

TM-1-6625-724-13P Aviation Vibration Analyzer Manual
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TM 1-6625-724-13&P 0071 00 0071 00-3 Track and balance of main rotor blades should be performed when any of the following occurs: One or more blades have been changed. One or more tip caps have been changed. One or more pitch control rods or rod end bearings have been changed. The main rotor blades have been removed and the hub has been disassembled. As per applicable maintenance manuals. A typical track and balance mission from start to finish includes the following: Phase main rotor blades as per applicable maintenance manual. For AH-64A refer to TM 1-1520-238-23, or for AH-64D refer to the Longbow IETM, TM 1-1520-LONGBOW/APACHE. NOTE Phasing the main rotor blades is an important starting point for track and balance and if not performed correctly, will not allow track and balance to be completed in a timely manner. Install the Aviation Vibration Analyzer, refer to task 1 of this document. Perform preparation for main rotor track and balance, task1 procedure 2. NOTE Tail rotor balance will be accomplished prior to in-flight track and balance. The tail rotor balance procedure is performed during ground run operations. If the tail rotor is wired, take the measurements during the same ground runs used for main rotor ground track and balance. NOTE If it is anticipated that the rotor track and balance has not been disturbed (i.e., track and balance is being performed to verify that nothing has changed), and if ground track is within 1.5 inch high to low blade and ground balance is 0.2 ips or less, proceed directly to flight. If flight measurements are significantly above limits, perform GROUND test plan. If flight states require only fine-tuning adjustments, skip GROUND test plan. Perform tail rotor balancing if required, task 4. Perform GROUND track and balance, task 2. Perform FLIGHT track and balance, task 3. The AH-64 Flight Plans are listed below with a brief description of their purpose. Table 1 (AH-64A) and table 2 (AH- 64D) show the Test States that comprise each Flight Plan. The selectable Flight Plans are listed in order of appearance in the menu on the CADU and not in the order in which they are to be performed. The AH64NB_R.CMD (AH-64A) and AH64D2_R.CMD (AH-64D) script files are used when the Signal Processing Unit (SPU) and permanently installed vibration detection system is by-passed.

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