18-13 Track Adjustment (continued)
A. Main Rotor Blade Pitch Link (continued)
3. b. C258-1 Pitch Link: Adjust link assembly per the following:
i. Refer to Figure 18-3B. Cut and discard pitch link assembly safety wire.
Using backup wrench on link assembly, loosen 21FKF-813 nut. Remove
hardware securing lower rod end to swashplate.
ii. Rotate link assembly to shorten or lengthen pitch link as required. One-
half turn of link assembly changes blade angle by approximately 0.44°.
iii. Refer to Figure 5-1. Verify rod end threaded shank blocks passage of 0.020-
inch diameter lockwire through link assembly witness hole. Install hardware
securing rod end to swashplate and standard torque fasteners per § 20-32.
iv. Position rod ends to allow as much pitch link rotation as possible without
binding. Using backup wrench on link assembly, special torque 21FKF-
813 nut per § 20-33. Safety fitting to link assembly using 0.032-inch
diameter lockwire.
v. Repeat steps on opposite pitch link as required; torque stripe per Figure 5-1.
Page 18.7C Chapter 18 Track and Balance APR 2017
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