TEO-540-A1A Engine Maintenance Manual
05-50 © 2021 Avco Corporation. All Rights Reserved
Page 44 February 2021
YO-233-B2A Engine Maintenance Manual
Table 1
Overspeed Values for YO-233-B2A Series Engines
Engine overspeed less
than 5% in excess of
maximum rated rpm for
more than 3 seconds
a. Identify and correct the cause of the overspeed.
b. In the engine logbook, record the overspeed incident and
any inspections and corrective action.
Engine overspeed
between 5% and 10%
in excess of maximum
rated engine rpm for
more than 3 seconds.
a. Identify and correct the cause of the overspeed.
b. Complete the “Cylinder Overspeed Inspection” procedure in
this chapter.
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.
Engine overspeed more
than 10% in excess of
maximum rated engine
rpm for any duration
3081 or
more
for any
length
of time
a. Remove the engine from the aircraft. Refer to the “Engine
Removal” procedure in Chapter 72-00.
b. It is recommended the engine be sent to Lycoming Engines
for customized evaluation. Include a description of the
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
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