64-11 Static Balance
Refer to R66 Illustrated Parts Catalog (IPC) Figure 64-1.
A. Chordwise Static Balance
1. Refer to Figure 64-2. Install MT179-4 balance bar into tail rotor assembly. Install
teeter hinge bolt, and special torque nut to 350 in.-lb. Using a carpenters square,
adjust balance bar until approximately perpendicular to hub.
2. Place tail rotor assembly with balance bar on Anderson 20 or equivalent balancing
stand. Hold tail rotor assembly vertically, then allow to fall. If the blade falls leading
edge first, the top blade is the heavy blade. If the blade falls trailing edge first, the
top blade is the light blade.
3. To simulate pitch link attachment, assemble hardware as shown and install in blade
pitch horns. Install standard washer, nut, and palnut on heavy blade fastener.
Standard torque hardware per Section 20-32.
4. Chordwise balancing is achieved by varying NAS6604 bolt length and nut-side
washers on light blade fastener. Select bolt length and washers for balancing, and to
meet torque requirements per Section 20-30. Standard torque hardware per Section
20-32, and repeat step 2.
5. Blades are balanced chordwise when blade does not fall when positioned vertically
on balancing stand. Repeat step 4, adjusting bolts and washers until blades are
balanced.
6. Perform spanwise static balance per Section 64-11 Part B.
25 OCT 2010 R66 Maintenance Manual Chapter 64 Tail Rotor Page 64.5
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