Low Oil Pressure During Flight - Lycoming TEO-540-A1A Installation And Operation Manual

• Refer to the latest revision of Service Bulletin No. SB-369 for corrective action for engine
overspeed.
• Record all incidents of engine overspeed in the engine logbook, along with the inspection and
any specified corrective action taken per Chapter 05-50 in the TEO-540-A1A Engine
Maintenance Manual.

Low Oil Pressure During Flight

Circumstances which cause loss of oil pressure are many and varied. Therefore, it is difficult to make
a prediction of the extent of damage to the engine or its future reliability. In case of oil pressure loss
or engine operation with oil below the recommended minimum operating level (identified in Table
A-1 in Appendix A), the most conservative action is to remove the engine, disassemble, and
completely examine all engine components per instructions in the TEO-540-A1A Engine
Maintenance Manual.
NOTICE: Very often a sudden loss of oil pressure also shows a sudden increase in oil temperature.
Any time oil pressure falls below the minimum level, complete a safe landing of the aircraft as soon
as possible. Identify the root cause according to the following protocol progressive steps identified in
Chapters 05-50 and 12-30 of the TEO-540-A1A Engine Maintenance Manual.
NOTICE: Any decision to operate an engine that had a loss of oil pressure without an inspection
must be the responsibility of the agency who is putting the aircraft back into service.
Engine Conditions
Page 76
TEO-540-A1A Engine Installation and Operation Manual
© 2018 Avco Corporation. All Rights Reserved
October 2018