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IO-390-D Series Engine Installation and Operation Manual
Engine Model Nomenclature
The table below identifies the basic nomenclature of the IO-390 engine models. Hyphenated
numbers and letters in the suffix (D1A6, D3A6, D1B6, or D3B6) of the engine model number are
configuration designations associated with the core engine.
Scope of this Manual
This manual supplies instructions (in compliance with Federal Aviation Regulations FARs 33.5 and
21.50) for engine description, uncrating procedures, acceptance check, engine lift procedure, engine
preservation and storage, depreservation, engine installation requirements, engine installation,
operation and stop procedures, engine initiation (break-in/flight test), fuels and oil to be used, and
operating specifications for IO-390-D series Lycoming engines.
The installation instructions in this manual are basic guidelines. When installing the engine in the
airframe, follow the airframe manufacturer's installation instructions.
For maintenance procedures, such as: oil changes, oil addition, oil filter replacement/oil pressure
screen cleaning, routine time-interval inspections, routine service, spark plug replacement/inspection
procedures, cylinder inspection, fuel system inspection, scheduled servicing procedures,
airworthiness limitations, fault isolation guidelines and procedures to replace components and to
disassemble and assemble the engine, refer to the IO-390-D Series Engine Maintenance Manual.
For spare parts information, refer to the IO-390-D Series Illustrated Parts Catalog.
Refer to the latest revision of the Service Table of Limits - SSP-1776, for dimensions, clearances,
measurements, and torque values.
Service Bulletins, Service Instructions, and Service Letters
As advancements in technological applications on this engine continue, Lycoming Engines will
make future revisions to this manual. However, if more timely distribution is necessary, Lycoming
Engines supplies subscribers with 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 without a subscription.
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 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 have a later
date than this manual) that pertain to the engine models in this manual supersede
procedures in this manual.
For reference and future updates, the Service Document List at the front of this manual identifies the
service documents included in this manual.
© 2020 Avco Corporation. All Rights Reserved
March 2020
INTRODUCTION
Model Number
I
Fuel Injected
O
Horizontally Opposed
390
Displacement in cubic inches
Meaning
Introduction
Page xv
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