TEO-540-A1A Engine Maintenance Manual
Introduction © 2021 Avco Corporation. All Rights Reserved
Page xvi February 2021
YO-233-B2A Engine Maintenance Manual
Warnings, Cautions, and Notices
Be sure to read and obey the Warnings, Cautions, and Notices in this manual and in service
documents. Although Lycoming Engines cannot know all possible hazards or damages, it makes a
reasonable effort to supply the best known guidance and recommended practices for safe operation
and maintenance of its engines.
The table below defines the four types of safety advisory messages used in this manual as per the
American National Standard and ANSI Z535-6-2006.
Safety Advisory Conventions
Indicates a hazardous situation which, if not avoided, will result
in death or serious injury. This signal word is to be limited to the
most extreme situations.
Indicates a hazardous situation which, if not avoided, could
result in death or serious injury.
Indicates a hazardous situation which, if not avoided, could
result in minor or moderate injury. It also can be used without
the safety alert symbol as an alternative to "NOTICE."
The preferred signal word to address practices not related to
personal injury.
NOTICE: In this manual, the word "recommend" refers to "best practices."
Service Bulletins, Service Instructions, and Service Letters
As advancements in technological applications on this engine continue, Lycoming will make future
revisions to this manual. However, if more timely distribution is necessary, Lycoming supplies up-
to-date Service Bulletins (SBs), Service Instructions (SIs) and Service Letters (which are abbreviated
with a capital “L” followed by the number, example L180). Special Advisories (SAs) are supplied as
necessary.
For additional publication information, look on Lycoming’s website (Lycoming.com) or speak to
Lycoming Engines by telephone: U.S. and Canada toll free: +1(800) 258-3279; or Direct: +1 (570)
323-6181.
Applicable information from Lycoming Engines' Service Bulletins, Service Instructions, and Service
Letters are included in this manual at the time of publication. Any new service information will be
included in the next update of the manual.
Reminder: Unless otherwise specified, Lycoming Engines' service documents (which are dated
after this manual’s release date) override procedures in this manual.
For reference, the Service Document List at the front of this manual shows the service documents
referenced or included in this manual.
List of Publications
Refer to the latest revision of Service Letter No. L114 for a list of Lycoming Engines' publications.
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