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TM 1-6625-724-13&P
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TASK 2 – TRACK AND BALANCE MAIN ROTOR ON GROUND
PROCEDURE 2.2 WEIGHT-ONLY ADJUSTMENT
a. Press QUIT. Cursor to highlight Edit Adjustables. Press DO.
b. Turn OFF all 4 pitch links and turn ON blades 1 and 2 weights. Press DO.
c. Record the weight adjustments. Perform procedure 3.
PROCEDURE 2.3 WEIGHT AND PITCH LINK ADJUSTMENT
a. Press QUIT. Cursor to highlight Edit Adjustables. Press DO.
b. Turn ON blades 1 and 2 weights. Press DO.
c. Record the weight and pitch link adjustments, go to procedure 3.
PROCEDURE 3: APPLY ADJUSTMENTS, VERIFIY / REPEAT
a. Apply recorded AVA solution, making weight and/or pitch link adjustments. For the AH-64A, follow the
instructions in procedure 4 for pitch links adjustments and weight changes refer to TM 1-1520-238-23, and for the
AH-64D refer to IETM TM 1-1520-LONGBOW/APACHE.
b. Repeat the ground measurement and make additional adjustments as necessary until track is below 0.25 inch
and lateral vibration is 0.20 ips (recommended 0.10 ips) or less.
PROCEDURE 4: MAIN ROTOR PITCH LINK ADJUSTMENTS
a. Mark barrel and upper rod end jam nut with a single vertical line for reference.
b. Cut lockwire securing jam nuts to barrel of pitch link to be adjusted.
c. Loosen upper jam nut while holding barrel of pitch link.
d. Loosen lower jam nut while holding barrel of pitch link.
NOTE
To determine which way to turn the pitch link barrel to
raise or lower the blade, grasp the barrel with right hand
thumb extended up, turning the barrel the same direction
as your fingers are pointed will raise the blade up.
Turning barrel in the opposite directions will lower the
blade.
NOTE
Shortening the pitch link moves the blade down,
lengthening it moves the blade up.
e. Turn barrel the specified amount displayed on the CADU (“+” means lengthen, “-“ means shorten).
f.
Tighten jam nuts and torque to 900 INCH-POUNDS.
g. Safety jam nuts with lockwire.
h. Verify corrections by completing another ground run at the specified test conditions.
i.
Make appropriate logbook entry on the pitch control links, if any.
