18-16 Autorotational RPM Adjustment (continued)
3. After test flight, determine the following:
Test # 1 2 3 4 5
Elapsed Time (in-ight hourmeter reading
minus take-off hourmeter reading):
Pounds of Fuel Consumed
(elapsed time x 140 lb/hr):
Test Gross Weight
(take-off gross weight minus fuel consumed):
Test Longitudinal Center of Gravity:
Chart % RPM*:
Test % RPM (from in-ight data):
RPM Correction
(chart % RPM minus test % RPM):
*Perform step 4 to obtain value.
4. Refer to Figure 18-5. To find Chart % RPM, perform the following:
a. Start at outside air temperature, and draw a vertical line up to pressure altitude.
b. Draw a horizontal line from pressure altitude to rotorcraft gross weight at time of
autorotation.
c. Draw a vertical line down from autorotation gross weight to required auto RPM.
5. Adjust pitch links based on average RPM correction required. Lengthen both pitch links
to decrease RPM if test RPM is greater than chart RPM; shorten both pitch links to
increase RPM. One full rod end turn will change RPM approximately 3½%. Adjust both
pitch links exactly the same so track will not be affected.
6. Repeat previous steps as required until the RPM correction is ± 1% of chart RPM.
25 OCT 2010 R66 Maintenance Manual Chapter 18 Track and Balance Page 18.13
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