IO-390-D Series Engine Maintenance Manual
05-20
© 2020 Avco Corporation. All Rights Reserved
Page 20
March 2020
IO-390-D Series Engine Maintenance Manual
5.
50-Hour Engine Inspection for IO-390-D Series Engines
The purpose of this inspection is to make sure that the engine operates correctly.
A.
Complete the 50-Hour Engine Inspection after every 50 hours of engine operation or every 4
months (whichever occurs first).
B.
Copy and complete the 50-hour 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.
50-Hour Engine Inspection Checklist for IO-390-D Series Engines
Engine Model Number___________________
Engine Serial Number:___________________
Engine Time:___________________________
Date Inspection Done:____________________
Inspection done by:______________________________
Inspection Item
Comments
Results/Notes
Done
Complete the Visual Inspection
Checklist in this chapter.
Refer to the section “Visual
Inspection for IO-390-D
Series Engines” in this
chapter.
Complete the Operational Ground
Check in Chapter 72-00.
Make sure the engine
operates correctly to
specifications.*
NOTICE:
On new, rebuilt, or overhauled engines, during the first 50 hours of engine operation,
operate this engine on mineral oil until oil consumption has stabilized.
Calculate oil consumption.
Refer to the “Oil
Consumption“ section in
Chapter 12-10
Complete the 25-hour
inspection again until oil
consumption stabilizes.
NOTICE:
If the engine has an oil pressure screen (instead of an oil filter) clean the oil pressure
screen every 25 hours per the “25-Hour Engine Inspection Checklist for IO-390-D
Series engines.”
On an engine with an oil filter,
complete an oil change and oil
filter replacement.
Refer to the sections in
Chapter 12-10:
•
"Oil Change Procedure”
•
“Oil Filter Replacement”
•
“Oil Filter Inspection”
* Appendix A of the
IO-390-D Series Engine Installation and Operation Manual.
