Page 5.24 Chapter 5 Inspections JUL 2020
5-45 100-Hour / Annual Inspection (continued)
MAIN ROTOR GEARBOX COMPARTMENT (continued)
A947-2 (Main Rotor Drive) Plate Assemblies:
Refer to Figure 5-4A. Inspect condition. Verify no distortion, nicks, scratches,
cracks, corrosion, or fretting. If fretting is detected, contact RHC Technical Support.
Verify bonded washers are installed on both sides of each flex plate ear. Verify
proper installation, security, and operating clearance.
F642 (Engine) Shaft Weldment:
Inspect condition. Verify 0.2 inch minimum clearance between shaft weldment and
firewall grommet; verify equal gap concentrically between shaft and box assembly
hole edges. Adjust F174-1 support weldment rod ends per § 53-31 as required.
Rotate shaft and verify no cracks, corrosion, or fretting. Verify proper installation,
security, and operating clearance.
Engine Firewall:
Inspect condition. Verify no deformation, buckling, wrinkling, nicks, scratches,
dents, cracks, corrosion, fretting, or loose rivets. Verify no leakage from fuel tanks.
Engine Oil Tank:
Inspect condition. Verify no leakage or obvious damage to oil tank exterior. Check
tank interior for foreign objects. Add oil as required per R66 POH Section 8. Verify
tank security.
Tailcone Attachment:
Inspect condition. Verify no cracks near fasteners attaching tailcone to upper frame.
Verify proper installation and security.
Upper Steel Tube Frame:
Inspect condition. Verify no nicks, scratches, dents, cracks, or corrosion. Verify
no chafing where wires, hoses, or clamps attach to frame. Examine each weld for
cracks with an inspection light and mirror.
CAUTION
Upper steel tube frame is fatigue loaded and therefore suscep-
tible to fatigue cracks. Inspect all joints thoroughly.
Antenna Wiring & Connectors:
Inspect condition. Verify no loose, chafed, frayed, or broken wires. Verify no
damaged connectors. Verify neatness, proper routing and installation, and security.
Check grommets for proper installation.
Fasteners & Torque Stripes:
Inspect condition. Verify proper installation and security of fasteners. Renew
deteriorated torque stripes per Figure 5-1.
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