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Flying
Handbook Menu > Ground
Operations > Visual
Inspection > Engine And Propeller
The pilot should make note of the condition
of the engine cowling. [figure2-8] If the cowling rivet heads
reveal aluminum oxide residue, and chipped paint surrounding
and radiating away from the cowling rivet heads, it is a sign
that the rivets have been rotating until the holes have been
elongated. If allowed to continue, the cowling may eventually
separate from the airplane in flight. Certain engine/propeller
combinations require installation of a prop spinner for proper
engine cooling. In these cases, the engine should not be operated
unless the spinner is present and properly installed. The pilot
should inspect the propeller spinner and spinner mounting plate
for security of attachment, any signs of chafing of propeller
blades, and defects such as cracking. A cracked spinner is unairworthy.
The propeller should be checked for nicks, cracks, pitting,
corrosion, and security. The propeller hub should be checked
for oil leaks, and the alternator/ generator drive belt should
be checked for proper tension and signs of wear. When inspecting
inside the cowling, the pilot should look for signs of fuel
dye which may indicate a fuel leak. The pilot should check for
oil leaks, deterioration of oil lines, and to make certain that
the oil cap, filter, oil cooler and drain plug are secure. The
exhaust system should be checked for white stains caused by
exhaust leaks at the cylinder head or cracks in the stacks.
The heat muffs should also be checked for general condition
and signs of cracks or leaks. The air filter should be checked
for condition and secure fit, as well as hydraulic lines for
deterioration and/or leaks. The pilot should also check for
loose or foreign objects inside the cowling such as bird nests,
shop rags, and/or tools. All visible wires and lines should
be checked for security and condition. And lastly, when the
cowling is closed, the cowling fasteners should be checked for
security.
figure2-8. Check the propeller and
inside the cowling.
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