50-Hour Engine Inspection For Io-390-D Series Engines - Lycoming IO-390-D Series 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
50-Hour Engine Inspection Checklist for IO-390-D Series Engines
Engine Model Number___________________
Engine Time:___________________________
Inspection done by:______________________________
Inspection Item
Complete the Visual Inspection
Checklist in this chapter.
Complete the Operational Ground
Check in Chapter 72-00.
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.
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.
* Appendix A of the IO-390-D Series Engine Installation and Operation Manual.
05-20
Page 20
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.
Comments
Refer to the section "Visual
Inspection for IO-390-D
Series Engines" in this
chapter.
Make sure the engine
operates correctly to
specifications.*
Refer to the "Oil
Consumption" section in
Chapter 12-10
Complete the 25-hour
inspection again until oil
consumption stabilizes.
Refer to the sections in
Chapter 12-10:
• "Oil Change Procedure"
• "Oil Filter Replacement"
• "Oil Filter Inspection"
IO-390-D Series Engine Maintenance Manual
IO-390-D Series Engine Maintenance Manual
Engine Serial Number:___________________
Date Inspection Done:____________________
Results/Notes
© 2020 Avco Corporation. All Rights Reserved
Done
March 2020