TASK 4 TRACK ROTORS (IN FORWARD FLIGHT)

Figure 12. HOVER Diagnostic Flow Chart

Figure 13. FLIGHT Flow Chart

TM-1-6625-724-13P Aviation Vibration Analyzer Manual
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TM 1-6625-724-13&P 0075 00 0075 00-19 TASK 4 – TRACK ROTORS (IN FORWARD FLIGHT) PROCEDURE 1: CONFIGURE AVA FOR FORWARD FLIGHT a. Perform task 1, Test Equipment Installation/Checkout, procedures 1 through 6. b. Turn on DAU. c. Turn on CADU. d. Operate aircraft in forward flight. PROCEDURE 2: PERFORM FLIGHT MEASUREMENT a. Press QUIT on the CADU until all selections show undefined. b. Select CH47 from Aircraft Type menu. c. Select proper tail number from previous selections in Tail Number menu or enter a new tail number (up to seven characters). d. Enter the Flight Plan menu and select FLIGHT. e. Enter MEASURE mode by pressing F1. Verify that FLIGHT is selected. f. Press DO when the pilot is stable at the highlighted selection. Re-verify that the pilot is at the required Test State and press DO again. The AVA will acquire track and vibration data and return to the selection display when the system is ready for the next measurement. g. After the last measurement is completed, press DO on Finish, press DO on Diagnostics. If measurements are within specified limits, press QUIT to the Main Menu. CAUTION Do not change the tab angle that is stenciled on the rotor blade. If the blade is replaced for any reason, the tab must be reset to the stenciled angle. See TM 55-1520-240-23. h. If measured values exceed manufacturer’s desired levels, press the DO key to enter the DIAGS mode. Perform all corrections displayed on the screen. Check to ensure that all screens of a multiple screen solution have been performed. If alterations to these corrective actions are desired, use the Edit Adjustables and Edit Defaults options. Do not use a partial set of the adjustments. The recommended adjustments have accounted for the cross coupling effects of the tandem rotors and using a partial set of the corrections may increase the total vibration environment. See figure 13 for a detailed flow chart concerning FLIGHT. NOTE Evaluate the ability to use the recommended adjustments. If modifications to the adjustments are desired, enter the menu option Edit Adjustables. Make the desired changes and press the DO key. NOTE Make corrective adjustments in accordance with TM 55- 1520-240-23. NOTE Adjustment of the trim tab will change the hover track approximately 1/6 inch per degree bent. The AVA will compensate for this if the Edit Adjustables display is not altered.

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