IO-390-D Series Engine Maintenance Manual
© 2020 Avco Corporation. All Rights Reserved
05-20
March 2020
Page 23
IO-390-D Series Engine Maintenance Manual
6.
100-Hour or Annual Engine Inspection for IO-390-D Series Engines
NOTICE:
Refer to the aircraft manufacturer’s recommendation as to whether this inspection is to
be completed every 100 hours of engine operation or annually.
The purpose of this inspection is to examine the ignition, EIS or magnetos, electrical systems, the
engine cylinders, and the exhaust system.
A.
Complete the 100-Hour Engine Inspection after the first 100 hours of operation since the
engine has been in service and then after every 100 hours of operation or during each annual
aircraft inspection (whichever occurs first).
B.
Copy and complete the 100-hour or Annual Engine Inspection Checklist for IO-390-D Series
engines as a record of engine service. Record the engine hours.
WARNING
BEFORE ANY ENGINE INSPECTION OR SERVICE PROCEDURE,
MAKE SURE THE IGNITION SWITCH IS SET TO OFF AND THAT ALL
POWER TO THE ENGINE IS DISCONNECTED. ENSURE ALL
OBJECTS/PERSONNEL ARE CLEAR OF THE PROPELLER’S
ROTATIONAL ARC. IF POWER IS ON, A LOOSE OR BROKEN WIRE
CAN CAUSE THE ENGINE TO START AND THE PROPELLER TO
TURN WHICH CAN LEAD TO DEATH OR SERIOUS INJURY OR A
PROPELLER STRIKE.
100-Hour or Annual Engine Inspection Checklist for IO-390-D Series Engines
Engine Model Number___________________
Engine Serial Number:___________________
Engine Time:___________________________
Date Inspection Done:____________________
Inspection done by:______________________________
NOTICE:
Complete the Operational Ground Check prior to and after each inspection, after
maintenance, and after engine assembly. Refer to Chapter 72-00.
Inspection Item
Comments
Results/Notes
Done
Complete the 50-Hour Engine
Inspection Checklist.
Refer to the section “50-
Hour Engine Inspection for
IO-390-D Series Engines” in
this chapter.
Ignition System
CAUTION
NEVER INSTALL A SPARK PLUG THAT HAS BEEN DROPPED.
Remove, examine, rotate, clean,
and re-gap acceptable spark
plugs. Replace worn spark plugs.
Refer to Chapters 05-30 and
74-20.
Examine the continuity of the
engine ground straps.
Refer to the aircraft
manufacturer’s instructions.
EIS
Inspect the EIS for oil leaks.
Inspect the EIS manifold
pressure connection (if
applicable).
