18-13 Track Adjustment
A. Main Rotor Blade Pitch Link
Refer to R66 Illustrated Parts Catalog (IPC) Figure 62-5.
NOTE
Shorten high pitch blade when adjusting track in a hover.
NOTE
During rigging, adjust both pitch links exactly the same for
collective adjustments.
1. Refer to Figure 18-3. For coarse length adjustment, adjust rod end and fitting per
the following steps:
a. Cut and discard pitch link assembly safety wire. Using backup wrench on link
assembly, loosen jam nut in middle of pitch link. Remove hardware securing
upper rod end to blade pitch horn.
b. Rotate rod end and fitting to shorten or lengthen pitch link as required. One full
turn changes blade angle by approximately 0.88°.
c. Refer to Figure 5-1. Verify rod end threaded shank blocks passage of 0.020-inch
diameter lockwire through pitch link witness hole. Install hardware securing rod
end to pitch horn and torque fastener per Section 20-32.
d. Position rod ends to allow as much pitch link rotation as possible without binding.
Using backup wrench on link assembly, torque jam nut 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.
2. For medium length adjustment, adjust rod end only per the following steps:
a. Using backup wrench on fitting, loosen upper rod end palnut and jam nut. Remove
hardware securing rod end to blade pitch horn.
b. Rotate rod end to shorten or lengthen pitch link as required. One-half rod end
turn changes blade track approximately 0.25 inch. One full rod end turn changes
blade angle by approximately 0.48°.
c. Refer to Figure 5-1. Verify rod end threaded shank blocks passage of 0.020-inch
diameter lockwire through pitch link witness hole. Install hardware securing rod
end to pitch horn and torque fastener per Section 20-32.
d. Position rod ends to allow as much pitch link rotation as possible without binding.
Using backup wrench on fitting, torque rod end jam nut and palnut per Section
20-32.
e. Repeat steps on opposite pitch link as required. Torque stripe per Figure 5-1.
25 OCT 2010 R66 Maintenance Manual Chapter 18 Track and Balance Page 18.7
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