Lycoming YO-233-B2A Maintenance Manual page 64

Overspeed Category
Engine overspeed less
than 5% in excess of
maximum rated rpm for
more than 3 seconds
Engine overspeed
between 5% and 10%
in excess of maximum
rated engine rpm for
more than 3 seconds.
Engine overspeed more
than 10% in excess of
maximum rated engine
rpm for any duration
05-50
Page 44
Overspeed Values for YO-233-B2A Series Engines
rpm
2801 a. Identify and correct the cause of the overspeed.
to b. In the engine logbook, record the overspeed incident and
any inspections and corrective action.
2940
2941 a. Identify and correct the cause of the overspeed.
b. Complete the "Cylinder Overspeed Inspection" procedure in
to
this chapter.
3080
c. Refer to Chapter 12-10:
(1) Drain the lubricating system.
(2) Remove the suction screen and oil filter.
(3) Examine the suction screen and oil filter element for
metal contamination. If any unexplained metal
accumulation is found, identify and correct the cause
before putting the engine back into service.
d. Complete the "Valve Train Overspeed Inspection"
procedure in this chapter.
e. Complete the "EIS Overspeed Inspection" or "Magneto
Overspeed Inspection" in this chapter.
f. In the engine logbook, record the overspeed incident and
any inspection and corrective action.
a. Remove the engine from the aircraft. Refer to the "Engine
3081 or
more Removal" procedure in Chapter 72-00.
for any
b. It is recommended the engine be sent to Lycoming Engines
length
for customized evaluation. Include a description of the
of time
overspeed incident, amount of overspeed, and duration.
c. In the engine logbook, record the overspeed incident and
any inspections and corrective action.
OR
Refer to Chapter 72-05 and the latest revision of Service
Bulletin No. SB-240 to:
• Disassemble the engine
• Complete an inspection of the engine
• Replace any parts that are damaged or not in compliance
• Replace any parts that must be replaced at overhaul or upon
removal
YO-233-B2A Engine Maintenance Manual
TEO-540-A1A Engine Maintenance Manual
Table 1
Corrective Action
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February 2021