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Scheduled Maintenance
50-HOUR INSPECTION
NOTE...
Research and comply with any applicable Service
Publications and Airworthiness Directives.
1. Thoroughly inspect the engine for any signs of
leakage. Clean engine exterior by spraying or
brushing with a flame resistant solvent used for
general cleaning of engine parts.
NOTE...
Any environmentally hazardous materials used in
cleaning must be caught and disposed of in
accordance with Environmental Protection Agency
regulations.
CAUTION...
Do not use any alkaline cleaning solutions for
external engine cleaning, these solutions will remove
the "alodized" finish of aluminum parts.
CAUTION...
Do not use Kerosene or Gasoline for cleaning.
2. A pre-inspection operational run-up must be
performed. See "Operational Inspection" of this
chapter.
(a) Record the engine operating parameters.
(b) Verify the recorded parameters meet the
published specifications for the engine as
provided
in
manufacturer's Maintenance, Operator's and
Overhaul Manuals.
After the operational inspection, inspect, isolate and
repair any leaks found.
3. Reference the applicable Airplane Flight Manual
for operational values.
4. Remove and inspect induction air filter. Clean or
replace as instructed by the filter manufacturer.
Inspect induction system ducts, seals and gaskets
for condition, deterioration and obstructions in
1-6
the
aircraft
or
engine
accordance with the aircraft manufacturer's
instructions. With induction air filter installed:
(a) Verify the induction air filter retainer is
properly installed and the attaching hardware
is secure in accordance with the aircraft
manufacturer's instructions.
(b) Replace any questionable components as
required in accordance with the aircraft
manufacturer's instructions.
(c) Inspect all engine controls for proper travel,
freedom of movement, wear, correct rigging
and correct attachment in accordance with the
aircraft manufacturer's instructions.
CAUTION...
Failure to properly install the induction air filter will
result in unfiltered air being ingested into the engine
which will accelerate engine wear and reduce engine
service life.
5. Inspect induction air box for security and
deterioration in accordance with the aircraft
manufacturer's instructions.
6. Inspect the aftercooler core and associated air
passages for obstructions.
WARNING
Insure the fuel selector is in the off position
prior to servicing fuel filters.
7. Drain the fuel filter and if sediment was noted,
remove it. Service as required and reinstall in
accordance with the aircraft manufacturer's
instructions.
8. Visually inspect engine and nacelle for fuel, oil
leaks and other discrepancies.
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