5-45 100-Hour / Annual Maintenance and Inspection [7 of 25 Pages]
HORIZONTAL CONTROL TUNNEL (Aft seats; continued)
Fuel Cutoff and Throttle Control:
Inspect condition. Verify proper fuel cutoff and throttle control clearance to installed
equipment and surrounding structure. Verify proper installation and security.
Cabin Heater Valve and Control:
Inspect condition. Verify control clearance to installed equipment and surrounding
structure. Verify heater valve security. Verify proper installation and smooth operation
of valve.
Flight Control Bellcranks:
Inspect condition. Verify no nicks, scratches, dents, cracks, or corrosion. Inspect
spherical bearings per Section 5-33. Verify proper installation, security, and operating
clearance.
Bellcrank Support:
Inspect condition. Verify no cracks or corrosion in welds. Verify no cracks where
support mounts to keel panels. Verify proper installation and security.
Evaporator and Blower Assembly (Air Conditioning; if installed):
Remove middle seat assembly and cover, and inspect condition. Verify refrigerant line
security, no damage, and clearance to adjacent structure. Verify no loose, chafed,
frayed, or broken wires. Verify proper installation and security of blower and evaporator
components.
Evaporator Drain Tubes and Valve (Air Conditioning; if installed):
Remove middle seat assembly and cover, and covers inside left and right seat
compartments to access drain system. Verify tubes are unobstructed. Function-
check drain system by simultaneously squeezing drain tube and sediment tube near
tee-fitting and verify check-valve ball moves up momentarily.
VERTICAL CONTROL TUNNEL
Vertical Push-Pull Tubes:
Examine accessible portion with inspection light and mirror. Inspect condition per
Section 5-32. Verify no nicks, scratches, chafing, dents, cracks, or corrosion. Inspect
rod end bearings per Section 5-33; verify rod ends are centered and palnut and jam
nut are tight. Check witness holes for proper thread engagement. Verify proper
installation, security, and operating clearance.
Beep Switch Actuator:
Inspect condition. Verify proper control clearance to installed equipment and surrounding
structure. Verify proper actuator installation, security, and operation.
Tunnel Interior:
Verify general cleanliness of tunnel interior. Inspect for fluid leaks or seepage;
investigate cause and correct.
Seat Backs:
Inspect condition. Verify upholstery cleanliness and security.
SEP 2012 R66 Maintenance Manual Chapter 5 Inspection Schedule Page 5.19
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