TASK 5 - TRACK MAIN ROTOR IN FLIGHT

TASK 4 - BALANCE MAIN ROTOR ON THE GROUND

PROCEDURE 2: PERFORM FLIGHT MEASUREMENTS - TM-1-6625-724-13P_493

TM-1-6625-724-13P Aviation Vibration Analyzer Manual
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0072 00 TM 1-6625-724-13&P 0072 00-14 TASK 5 - TRACK MAIN ROTOR IN FLIGHT Main rotor in-flight vertical tracking should be performed when any of the following occurs: • 1/REV in-flight vertical vibration is unacceptable. • Changes have been made to the track of one or more main rotor blades as a result of performing ground tracking adjustments (task 3 or task 4). PROCEDURE 1: EQUIPMENT INSTALLATION NOTE Aircraft ground track and balance specified requirements (tasks 3 and 4) are to be completed prior to performing in flight Test States unless aircraft is already in service and flying. a. Install test equipment, see task 1). b. Turn on DAU. c. Turn on CADU. PROCEDURE 2: PERFORM FLIGHT MEASUREMENTS a. Press QUIT on the CADU until all selections are undefined. b. Use cursor keys to highlight Aircraft Type, then press DO. c. Use cursor keys to highlight aircraft type OH-58A/C, and then press DO. d. Tail Number is highlighted. Press DO. e. Use cursor keys to highlight a tail number or enter a new tail number (up to seven digits), then press DO. f. Flight Plan is highlighted. Press DO. g. Use cursor keys to highlight FLIGHT. Press DO. h. Enter the Measure mode by pressing F1. Verify that Test State Idle is highlighted. WARNING If main rotor 1/REV vibration becomes objectionable, acquire data normally through the highest airspeed at which vibration can be tolerated. Do not skip test conditions, data should be taken from ground to the highest airspeed possible. After data is taken at the highest speed achieved, Press QUIT then highlight “Save and Exit” and then press DO. Land the aircraft and perform corrections suggested by the CADU prior to further flight. i. Press DO when the aircraft is stable at the highlighted selection. Reverify that the aircraft is at the required Test State (IDLE, 35% TQ, Hover, CLIMB, 80K, 110K, or L/DOWN) and press DO again. Perform this operation each time a measurement is completed and another Test State is highlighted. The AVA will acquire track and vibration data and return to the selection menu. j. After the last measurement is completed, press DO on Finish, then press DO on Diagnostics. If measurements are within specified limits, press QUIT to Main Menu, then go to step q. k. If measured values exceed specification, press DO to execute diagnostics. AVA will make recommendations to correct for excessive vibration.

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