JUL 2020 Chapter 62 Main Rotor Page 62.10A
FIGURE 62-6A MAIN ROTOR HUB REPAIR LIMITS
62-22 Inspection and Repair
1. Remove main rotor hub bearings per § 62-21 steps 1 thru 4.
2. Remove hub paint by dry media blasting.
3. Refer to Figure 62-6A. If required, polish surfaces using 320-grit or finer wet-or-dry
sandpaper to 0.25 inch minimum blend radius.
a. Visually inspect hub bearing bores and verify no scoring, scratches, or other
obvious damage. Polish out fretting or corrosion to 0.002 inch maximum depth on
inner and outer surfaces within 2.125 inches of bearing bores. Polish out fretting
or corrosion to 0.001 inch maximum depth on inside of bearing bores; maximum
bearing bore diameter is 1.5618 inches.
b. Visually inspect all other areas of hub for obvious damage. Polish out nicks,
scratches, gouges, or corrosion to 0.010 inch maximum depth within 0.30 inch
of inside and outside edges of hub. Polish out nicks, scratches, gouges, or
corrosion to 0.060 inch maximum depth on all other areas.
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