62-10 Main Rotor Blades (continued)
A. Removal (continued)
3. Refer to Figure 62-3. Remove cotter pins and loosen nuts of blade coning hinge bolts
so they are just finger tight.
4. Remove nut, thrust washer, and shims (if used) from trailing-edge side of one blade hinge
bolt. Cone blade so spindle tusk no longer contacts droop stop. While supporting blade
at root, carefully rotate pitch horn down and remove hinge bolt and thrust washer.
NOTE
Installation hardware is matched individually to each blade
installation; carefully reinstall all attach hardware into rotor hub
exactly as removed.
CAUTION
Support remaining main rotor blade in a level position during
and after removal of opposite blade.
5. Store rotor blades on a cushioned surface to prevent damage to blade skins.
6. Repeat step 4 to remove remaining blade.
B. Installation
Refer to R66 Illustrated Parts Catalog (IPC) Figures 62-1, 62-3, and 62-5.
1. Verify correct teeter hinge friction per Section 62-32, step 4.
2. If previously installed information is unavailable, perform coning hinge journal and shim
calculation per Section 62-31.
3. Refer to Figure 62-3. With rotor hub level, insert journals into coning hinge bearings.
Install thrust washer on coning hinge bolt.
4. Position blade in hub until spindle hole aligns with journal bores, coning blade as required
to keep tusk away from droop stop. Rotate pitch horn down and install hinge bolt at
leading-edge side.
NOTE
To assist bolt installation, temporarily insert an old bolt from
trailing-edge side to align spindle with journals.
5. Install trailing-edge shims (if used) and thrust washer and, prior to installing nut, coat
bolt threads and nut face with A257-9 anti-seize compound.
NOTE
Do not allow anti-seize compound to contact journals or hub
bearing areas. These areas must be clean and dry.
25 OCT 2010 R66 Maintenance Manual Chapter 62 Main Rotor Page 62.3
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