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TM 1-6625-724-13&P
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TASK 3 - TRACK AND BALANCE MAIN ROTOR IN FLIGHT
g. Compare the predictions of the tab only solution to those of the pitch link and tab solution. Select either the pitch
link and tab or the tab only solution, based on the effectiveness (predictions) as well as the simplicity of the
adjustment set.
h. Record the selected adjustment set. Add any required autorotation pitch link adjustments to the adjustment set.
i.
Do procedure 4.
PROCEDURE 3.2.2 Vertical < 0.6 ips AND measured lateral above limits.
a. Press QUIT.
b. Use the cursor to select Edit Adjustables, and then press DO.
c. Turn Blades 1 and 2 weights ON.
d. Turn all four pitch links OFF.
e. Press DO to calculate and display weight and tab adjustments. Note the adjustments given.
f.
Press QUIT.
g. View Predictions is selected, press DO.
h. Examine the predicted hover and ground lateral vibration:
1. If predicted hover or ground lateral are above limits, do procedure 3.2.2.1.
2. If predicted hover and ground lateral are in limits, record the AVA-recommended weight and tab adjustments,
add any pitch link moves required for autorotation rpm adjustment to the adjustment set, and do procedure 3.
PROCEDURE 3.2.2.1 Vertical < 0.6 ips AND measured lateral above limits, AND predicted lateral with weights
and tabs above limits.
a. Press QUIT.
b. Use the cursor to select Edit Adjustables, and then press DO.
c. Turn ON all 4 pitch links.
d. Press DO to calculate and display adjustments.
e. Make note of the adjustments given.
NOTE
If any pitch link move is greater than 1 1/2 flats, it is
recommended that the solution that includes pitch link
adjustments not be used. Instead, use the weight and
tab solution of procedure 3.2.2.2.
f.
Press QUIT.
g. View Predictions is selected, press DO.
h. Make note of the predicted vibration levels – both lateral and vertical.
i.
Compare the predictions for the weight and tab adjustment set, with the predictions for the weight, tab, and pitch
link adjustment set.
1. If the predicted vibration levels (both lateral and vertical) for the weight and tab solution are nearly as low as,
or are lower than the weight, pitch link and tab solution, record the weight and tab adjustments.
2. If the predicted vibration levels (both lateral and vertical) for the weight, tab and pitch link solution are
significantly better than the weight and tab only solution, record the weight, pitch link and tab adjustments.
j.
Add any pitch link moves required for autorotation rpm adjustment to the adjustment set.
k. Do procedure 4.
