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C69184 C69180 K11225 K11241 K11249
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(h)
Visually examine accessible portion of turbine torus assembly for cracks, erosion, deformation and wear.
NOTE: If supplemental containment ring has been installed, check that it is secure in both radial and axial directions. If not secure, remove APU for hot section inspection as outlined in Heavy Maintenance Section of APU Engine Overhaul Manual, 49-20-31.
(i)
Visually examine accessible portion of exhaust pipe assembly for cracks.
B. Check fuel system for the following:
(1)
Fuel filter element for cleanliness
(2)
Tubing for loose or broken clamps, loose or leaking connections, flexible lines for chafing.
(3)
Fuel control unit gaskets for leakage or deterioration.
(4)
Loose electrical or pneumatic connections.
C. Check bleed air system for the following:
(1)
Ducts for loose connections, loose or broken clamps.
(2)
All control air tubing for loose connections.
(3)
Loose electrical connections.
D. Check exhaust system for the following:
(1)
Duct connections for loose or broken fasteners.
(2)
Duct for deformation or corrosion.
E. Check lubricating system for the following:
(1)
Oil filter element for cleanliness.
(2)
Oil tank for oil quantity, loose or broken mountings, leakage.
(3)
Accessory cooling fan air inlet for cleanliness.
(4)
Tubing for loose or leaking connections.
(5)
Oil pump for leaking.
(6)
Oil pressure switches for leaks or loose electrical connector.
(7)
Oil cooler for leaks.
(8)
Oil low pressure switches for leaks or loose electrical connector.
(9)
Oil level switch for leaks or loose electrical connector.
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F. Check starting system for the following:
(1)
Starter for loose mounting bolts or electrical connectors.
(2)
Ignition unit for loose mounting bolts or electrical connectors.
(3)
Igniter plug for carbon deposits.
(4)
Igniter plug lead for broken or frayed insulation or loose connectors.
(5)
Centrifugal switch or tachometer generator (if installed) for loose mounting bolts or electrical connectors.
G. Check air inlet system for the following:
(1)
Air inlet door for cleanliness and distortion.
(2)
Air inlet door actuator for loose or broken electrical or mechanical connections.
(3)
Duct for deformation.
(4)
Duct connections for loose or broken fasteners.
(5)
Door switch for loose, chafed or broken electrical or mechanical connections.
(6)
Door linkage for loose or broken fasteners.
(7)
Check seal on door for deterioration or damage.
H. Check the following additional items:
(1)
Fuel drain on outside of airplane for cleanliness.
(2)
APU mounting bolts for looseness.
(3)
APU mount structure for loose fasteners.
