TASK 4 - TRACK MAIN ROTOR IN FLIGHT - TM-1-6625-724-13P

TASK 3 - BALANCE MAIN ROTOR ON THE GROUND - TM-1-6625-724-13P_525

PROCEDURE 2: PERFORM FLIGHT MEASUREMENTS - TM-1-6625-724-13P_527

TM-1-6625-724-13P Aviation Vibration Analyzer Manual
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0074 00 TM 1-6625-724-13&P 0074 00-12 TASK 4 - TRACK MAIN ROTOR IN FLIGHT NOTE Ensure tail rotor is balanced (task 5) before proceeding to fly. 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 2 or task 3). PROCEDURE 1: EQUIPMENT INSTALLATION NOTE Aircraft ground track and balance specified requirements (tasks 2 or 3) are to be completed prior to performing in- flight Test States if the aircraft was not in a previously flight worthy condition. Do not exceed any airspeed at which excessive vibration is present. NOTE For UH-1 with composite blades it is suggested that the operator stop working the rotor when the vertical 1/REV vibrations are in the 0.2 to 0.3 ips range at cruise flight. Working the rotor levels significantly lower will obtain a smooth 1/REV vibration but the perceived vibration by the crew will not be as good due to the feel of 2/REV vibrations in absence of the 1/REV. vibration. a. Install test equipment (refer to 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, and then press DO. c. Use cursor keys to highlight UH1 for metal blades and UH1CRB for composite blades, 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 IDLE is highlighted. i. Press DO when the aircraft is stable at the highlighted selection. Verify that the aircraft is at the required Test State (IDLE, FPG100, HOVER, 60K, 90K, 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 at each Test State and then 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 and proceed to step o. k. If measured values exceed specifications, press DO to enter the DIAGS mode. l. Evaluate the percentage improvements obtainable through View Predictions. The AVA will make recommendations to correct for excessive vibration. Perform corrections, making certain to view all screens of a multiple screen solution.

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