5-45 100-Hour / Annual Maintenance and Inspection [23 of 26 Pages]
ROTOR HUB & MAIN ROTOR BLADES (continued)
Blade Boots:
Inspect condition. Verify no boot defects, tears, material deterioration, or pinholes
resulting in oil leakage. Verify proper boot position and security. Verify sufficient
clearance from hub assembly through full control travel.
Fasteners & Torque Stripes:
Inspect condition. Verify proper installation and security of fasteners. Renew
deteriorated torque stripes per Figure 5-1.
Blade Tips and Skin-to-Spar Bond Lines:
Remove tip covers. Remove corrosion and loose paint from tip covers, blade tips,
and skin-to-spar bond lines. Using an AN970-4 washer or 1965-or-later U.S. quarter-
dollar coin, tap-test critical bond areas and verify no dull or hollow sounds. Visually
inspect critical bond areas and verify no separation. Epoxy prime, or prime and
paint, any exposed bare metal on tip covers, blade tips, and skin-to-spar bond lines.
Install tip covers, ensuring cover edges are flush with blade profile.
Blade Inspection and Care:
Refer to § 62-40. Inspect skins and doublers for scratches and corrosion. Inspect
blades for dents, local deformations, and voids. As required, wax blades with soft
cleaning cloths using carnauba-type wax (such as SC Johnson® Paste Wax). Ensure
tip cover and blade tip drain holes are unobstructed. Verify placard legibility and
remove old tracking tape and/or residue.
WARNING
Structural damage may occur if compressed air is applied to
blade tip drain holes.
LANDING GEAR
Landing Gear Fairings (if installed):
Open as required to access landing gear structure for inspection. Inspect condition.
Verify no nicks, scratches, dents, cracks, corrosion, fretting, or loose rivets. Verify
hose clamp security and acceptable general cleanliness of fairing interior. Close and
secure fairings.
Skid Tubes & Shoes:
Inspect condition. Verify skid tube and skid shoe wear is within limits specified in §
32-30 & 32-31. Verify drain holes are not obstructed. Verify security of rain caps;
if rain cap is loose or damaged, verify no internal corrosion.
Struts Assemblies:
Inspect condition. Verify no cracks or corrosion, especially at collar and gusset
joints and in weld areas at bottom of struts. Torque-check strut-to-skid-tube bolts.
Verify security.
Cross Tubes:
Inspect condition. With helicopter on level ground, verify minimum tail skid height
per § 32-20. Verify no cracks, corrosion, or fretting at elbows. Verify security of
(clear plastic) rain caps; if rain cap is loose or damaged, verify no internal corrosion.
(Note that one vent hole per cross tube is located near left or right end of tube to
prevent pressurization.)
MAY 2015 Chapter 5 Inspections Page 5.35
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