18-13 Track Adjustment (continued)
A. Main Rotor Blade Pitch Link (continued)
3. For fine adjustment, adjust fitting only per the following steps:
a. Remove and discard pitch link assembly safety wire. Using backup wrench on
link assembly, loosen jam nut in middle of pitch link. Using backup wrench on
fitting, loosen upper rod end palnut and jam nut.
b. Rotate fitting to shorten or lengthen pitch link as required. One full turn changes
blade track approximately 0.25 inch. One full turn of fitting changes blade
angle approximately 0.40°. For finer adjustment, count hex flats while rotating
fitting.
c. Refer to Figure 5-1. Verify rod end threaded shank blocks passage of 0.020-inch
diameter lockwire through pitch link witness hole.
d. Using backup wrench on link assembly, torque jam nut per Section 20-32. Using
backup wrench on fitting, torque rod end jam nut and palnut per Section 20-32.
Safety fitting to link assembly using 0.032-inch diameter lockwire.
e. Repeat steps on opposite pitch link as required. Torque stripe per Figure 5-1.
B. Main Rotor Blade Trim Tab
NOTE
To correct for a "climbing" blade condition (blade spread that
exceeds 3/8 inch with forward airspeed), bend high blade trim
tab down.
CAUTION
Do not use other helicopter manufacturers' trim tab bending
tools. Use of these tools will damage Robinson blades.
CAUTION
MT352-1 gage must contact trim tab trailing edge. If gage
does not contact tab trailing edge, tab is bent beyond limit.
CAUTION
Tighten MT526-8 bending tool bolt to bend tab; do not use tool
as a lever.
CAUTION
Bend tab upward only when absolutely necessary; bending tab
upward can increase rotor vibration.
1. Using felt tip marker, ink mark main rotor blade trim tab per Figure 18-4. Mark line
with a measuring point in the center of the tab (approximate).
25 OCT 2010 R66 Maintenance Manual Chapter 18 Track and Balance Page 18.9
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