TASK 4 BALANCE TAIL ROTOR - TM-1-6625-724-13P

TASK 4 BALANCE TAIL ROTOR - TM-1-6625-724-13P_464

TM-1-6625-724-13P Aviation Vibration Analyzer Manual
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TM 1-6625-724-13&P 0071 00 0071 00-33 TASK 4 – BALANCE TAIL ROTOR a. Operate the aircraft at full operating rpm, with the main rotor at flat pitch (full down collective). b. Turn on DAU. c. Turn on CADU. d. Press QUIT until the Main Menu appears. Highlight Aircraft Type and press DO. Highlight the appropriate script file (described under Main Rotor Track and Balance section) and press DO. NOTE If main rotor measurements are not being done at the same time, the tail rotor measurement is independent of the main rotor accelerometer configuration. If tail rotor balance is to be performed at the same time as main rotor ground track and balance, utilize whichever script file is being used relative to “SPU interface” or “external wiring” for the main rotor work. e. Tail number is highlighted. Press DO. Use cursor keys to highlight an existing tail number or enter the numbers from the keypad and press DO. f. Flight Plan is highlighted. Press DO. Highlight tail and press DO. g. Initiate measurement mode by pressing F1 MEASURE. h. fpgtl is highlighted. Press DO to initiate measurement, then DO again when the aircraft is steady at the desired condition. AVA will indicate Measuring and will display the rotor speed. Verify that the aircraft is at required Test State. i. Once the measurement has been successfully acquired, the AVA will exit the measurement screen automatically. Press DO on Finish. j. Highlight Diagnostics, and then press DO. PROCEDURE 5: PERFORM TAIL ROTOR BALANCE DIAGNOSTICS WARNING Ensure proper blade weight retaining hardware is installed in the tail rotor blades. WARNING NEVER remove ALL of the weight from the tail rotor blade tips in an attempt to “zero out” the balance for a new starting point. Doing so may cause severe tail rotor vibration and result in aircraft damage. In addition to being used for dynamic rotor balance, tail rotor tip weights serve the important purpose of maintaining the design static spanwise mass moment of the blade and were initially installed by the manufacturer. Efforts should be made to make the minimum disturbance to those weights over the course of tail rotor dynamic balance maintenance exercises.

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