5-45 100-Hour / Annual Maintenance and Inspection [16 of 26 Pages]
ENGINE (continued)
Firewalls:
Inspect condition. Verify no deformation, buckling, wrinkling, nicks, scratches,
dents, cracks, corrosion, fretting, or loose rivets. Pay particular attention to structural
attachment points. Inspect condition of engine-to-firewall seal. Verify no open holes.
WARNING
Open holes in engine-to-firewall seals are potential fire leak paths.
Engine Mounts:
Inspect condition. Verify no cracks or corrosion in engine mount weldment. Verify
safety wire and security of mounting bolts.
Lower 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
Lower steel tube frame is fatigue loaded and therefore susceptible
to fatigue cracks. Inspect all joints thoroughly.
Condenser and Fan Assemblies (Air Conditioning; if installed):
Inspect condition. Verify security of fans, box assembly, condenser, and firewall
supports. Verify security of dessicant cap.
Refrigerant Line Assemblies (Air Conditioning; if installed):
Inspect condition. Verify security, no damage, and clearance to adjacent structure.
Wiring:
Inspect condition. Verify no loose, chafed, or broken wires or terminals. Check for
heat or fluid damage. Verify neatness, proper routing and installation, and security.
Fasteners & Torque Stripes:
Inspect condition. Verify proper installation and security of fasteners. Renew
deteriorated torque stripes per Figure 5-1.
Close & Secure:
Verify foreign objects are removed. Verify equipment security. Verify cleanliness of
interior and of cover or cowling. Install/close inspection covers or cowlings removed
in preceding steps. Verify security.
Page 5.28 Chapter 5 Inspections MAY 2015
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