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Unscheduled Maintenance
ENGINE OVERSPEED INSPECTION
Engine operation at engine speeds in excess of rated
RPM limitations can cause damage to the engine and
can result in subsequent engine failure.
If an engine overspeed occurs determine the cause for
overspeed and correct it. The airframe manufacturer's
instructions on engine and propeller overspeed must
also be referenced and followed.
If an engine overspeed occurs use the following
procedures:
RPM TO 3000
1. Less than one minute - No action required
2. More than one minute - Proceed as follows:
a. Drain oil through a fine mesh screen and
inspect for debris.
b. Remove oil filter and inspect filter element
for debris.
c. Remove and inspect inside of rocker covers
for debris. Inspect valve stem (keeper
grooves) and valve keepers for condition,
security and proper installation. Inspect valve
springs,
rocker
rotocoils, pushrods, etc.
d. Perform a borescope inspection on all
cylinders.
e. If no discrepancies are noted, re-service
engine, perform operational inspection and
correct any discrepancies noted prior to
returning the engine to service.
f.
If discrepancies are found a decision must be
made, based on the evidence, as to the extent
of the corrective action required.
1-12
arms,
spring
retainers,
RPM TO 3300
In addition to action required for "" above proceed as
follows:
1. Remove all cylinder assemblies including rods
and pistons.
Clean, inspect, repair or replace all components
removed from the engine in accordance with the
manufacturer's current overhaul manual. Using
new connecting rod bolts and nuts, reassemble,
service and test the engine in accordance with the
current overhaul manual.
2. After five and ten hours of engine operation
remove oil filter and inspect filter element for
debris.
RPM EXCEEDING 3300
1. Remove engine and clearly identify "Removal
For Overspeed".
2. Engine and accessories must be completely
overhauled in accordance with the respective
manufacturer's current overhaul instructions or
replaced with certified airworthy components.
LIGHTNING STRIKE
It is impossible to assess internal damage that may
result from a lightning strike. A complete disassembly
and inspection of the engine must be accomplished in
accordance with the current overhaul manual.
CONTAMINATED FUEL INCORRECT
FUEL GRADE
If the aircraft is inadvertently serviced with the wrong
grade of fuel or jet fuel the fuel must be completely
drained and the tank properly serviced.
Any engine operated on fuel of lower grade than
approved for the engine or jet fuel must be completely
disassembled,
cleaned,
reassembled and tested in accordance with the
manufacturer's current overhaul manual.
inspected,
repaired,
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