Lycoming TEO-540-C1A Maintenance Manual page 79

TEO-540-C1A Engine Maintenance Manual
TEO-540-C1A Engine Maintenance Manual
Overspeed Category
Engine overspeed more
than 10% in excess of
maximum rated engine
rpm for any duration
(3) Cylinder Overspeed Inspection
(a) Complete the "Cylinder Compression Check Procedure" in Chapter 72-30 on all
cylinders as a check for the sealing quality of the rings and valves.
(b) Use a borescope or equivalent instrument to examine the walls of each cylinder for
scoring which could be caused by a stuck or broken piston ring. Refer to the
"Cylinder Borescope Inspection" procedure in Chapter 72-30.
(4) Valve Train Overspeed Inspection
(a) Either repeated moments or short periods of operation in the overspeed region
increase the rate of wear at an accelerated pace in the parts that make up the valve
train and consequently decrease engine reliability. In addition to the checks completed
on the engine during a 1000-hour inspection, complete the following steps to examine
the valve train before putting the engine back into service.
(b) Use a borescope or equivalent illuminated magnifying optical device to examine the
condition of the intake and exhaust valve faces and seat faces. If there is evidence of
excessive wear, pounding, or grooving, replace the valve and seat (valve seats can
only be replaced by an authorized vendor).
(c) Refer to the section "Exhaust Valve and Guide Inspection" in Chapter 72-30 and the
latest revision of Service Bulletin No. SB-388 to determine exhaust valve condition
and stem-to-valve guide clearance condition.
(d) Examine the external condition of valve keys, rockers, and exhaust valve guides for
damage (per Chapter 72-30). Examine valve springs for coil strikes or severe
bottoming of the coils. If damage to the valve springs is evident, remove them and
complete the check of the compression load. Replace any valve spring that is not
within limits as specified in the Special Torque Requirements Tables in Section V in
Part 1 of the latest revision of the Service Table of Limits - SSP-1776.
© 2018 Avco Corporation. All Rights Reserved
November 2018
Table 1 (Cont.)
Overspeed Values for TEO-540-C1A Engines
rpm
a. Remove the engine from the aircraft. Refer to the "Engine Removal
2833
Procedure" in Chapter 72-00.
or
more
b. It is recommended the engine be sent to Lycoming Engines for
for any
customized evaluation. Include a description of the overspeed
length
incident, amount of overspeed, and duration.
of time
c. In the engine logbook, record the overspeed incident and any
inspections and corrective action.
OR
Refer to Chapters 72-05 and 72-20, 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 other parts that must be replaced at overhaul or
upon removal
Corrective Action
05-50
Page 49