0071 00TM 1-6625-724-13&P0071 00-20b.) If all seven conditions have not been completed and no additional data is to be taken, press QUIT to exit themeasurement screen. Highlight Save and Exit and press DO. On the Main Menu, verify that the flight IDcorresponds to the flight for which a solution is desired and press F3 DIAGS.BEFORE ENTERING DIAGNOSTICS:a. Before entering diagnostics it may be beneficial to view the in flight vertical reading on the polar plot and theflight track trend. By doing this before entering diagnostics, it will give a good indication of what will berequired to smooth the aircraft. Figure 7 illustrates a polar plot display of the flight vertical vibration readingsfrom the AVA.Figure 7. Polar Plot Displayb. By viewing the figure 7 and the AH-64 coefficient polar chart for vertical vibration at the end of this appendix,this clearly shows that blade 1, blade 3, or both will require adjusting to move the vibration points towards thecenter. To move the vibration points towards center for this example would require blade 1 to be tabbed down(or pitch linked down) or blade 3 to be tabbed up (or pitch linked up). To verify this further it helps to view thetrack data. Figure 8 illustrates the track trend for this example from the AVA.Figure 8. AVA Track Trendc. The polar chart showed that either blade 1 or 3 may need to be adjusted to move the vibration to the center,and this track trend shows that blade 1 is the blade that needs to be adjusted. Adjustments should not bemade based on this track trend, the information from both the polar chart and the track trend should be used tomake smart decisions when running AVA diagnostics. This is emphasized here by the fact that if adjustmentswere based on this track trend alone, blade 2 might also be adjusted, which will actually increase the verticalvibration as shown in figure 9.
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