Lycoming TEO-540-C1A Maintenance Manual page 78

B. Engine Overspeed
CAUTION
(1) In engine overspeed, the engine operates above its rated (speed) revolutions per minute
(rpm). Momentary overspeed is an increase of no more than 10% of rated engine rpm for
a period not exceeding 3 seconds. If the duration and amount of overspeed is calculated to
fall within the limitations defined as momentary, no further maintenance actions are
necessary.
NOTICE: The EECS controls engine operation to prevent overspeed. Refer to the engine
(2) If an engine is operated at overspeed for more than 3 seconds, identify the category of
percent of overspeed based on the three categories of overspeed shown in Table 1. Refer
to the latest revision of Service Bulletin No. SB-369 for additional details.
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.
05-50
Page 48
DO NOT OPERATE THE ENGINE CONTINUOUSLY AT AN
OVERSPEED RATE BECAUSE PARTS CAN WEAR OUT AND
EVENTUALLY CAUSE ENGINE FAILURE.
specifications in Appendix A of the TEO-540-C1A Engine Installation and
Operation Manual for rated engine speed.
Record all incidents of engine overspeed in the engine logbook along with any
corrective action identified herein.
Overspeed Values for TEO-540-C1A Engines
rpm
2576 a. Identify and correct the cause of the overspeed.
to b. In the engine logbook, record the overspeed incident and any
2704 inspections and corrective action.
2705 a. Identify and correct the cause of the overspeed.
b. Complete the "Cylinder Overspeed Inspection" procedure in this
to
2832 chapter.
c. Refer to Chapter 12-10:
(1) Drain the lubricating system.
(2) Remove and examine the oil suction screen and oil filter for
metal contamination. If any unexplained metal accumulation is
found, identify and correct the cause before putting the engine
back into service.
d. Refer to Chapter 72-40. Disconnect both the inlet and outlet
attaching hardware from the turbocharger and examine the
compressor and turbine wheels for damage. Examine the shaft-
wheel assembly for free turning and for vertical and lateral motion,
which are evidence of damaged center housing bearings. If damage
in these areas is found, send the engine to Lycoming Engines for
evaluation before putting the engine back into service.
e. Complete the "Valve Train Overspeed Inspection" procedure in this
chapter.
f. In the engine logbook, record the overspeed incident and any
inspection and corrective action.
TEO-540-C1A Engine Maintenance Manual
TEO-540-C1A Engine Maintenance Manual
Table 1
Corrective Action
© 2018 Avco Corporation. All Rights Reserved
November 2018