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IO-390-D Series Engine Maintenance Manual
IO-390-D Series Engine Maintenance Manual
Engine Inspection Schedule for IO-390-D Series Engines
1.
As shown in the Engine Inspection Schedule below, the scope of engine inspections includes
A.
visual observations during engine servicing or maintenance as well as inspections based on
progressive time intervals after the engine is put into service.
All engine inspections are mandatory and must be completed no later than 10 hours after the
B.
specified time interval for the inspection. Refer to FAR 91.409 for additional requirements.
NOTICE: More frequent inspections could be necessary for engines operated in particulate-
laden or extremely humid, cold, damp environments.
Inspections in this manual apply to the engine and not to the aircraft. Refer to the
aircraft manufacturer's maintenance manual for inspection information on aircraft
components. For all engine accessory inspections, refer to the individual service
requirements from each manufacturer and Supplemental Type Certificates (STCs).
Engine Inspection Schedule for IO-390-D Series Engines
When to Complete Inspection
Before each time-interval inspection and during engine
servicing or maintenance
Initial 10-hour engine inspection
• After the first 25 hours of operation or the first 4 months
since the engine was placed into service (whichever occurs
first)
• If one or more new engine cylinders and/or piston rings
have been installed
• If the rate of oil consumption has not stabilized.
NOTICE: The engine can have either an oil filter or an oil pressure screen. Refer to "Oil Servicing
Schedule" in Chapter 12-10.
After every 50 hours of operation or every 4 months
After every 100 hours of operation or annually
After every 400 hours of operation
After every 500 hours of operation
After every 1000 hours of operation
Time Between Overhaul (TBO)
Lycoming Engines recommends engines be sent to the
factory for overhaul.
NOTICE: An Operational Ground Check must be completed prior to and after each inspection,
after maintenance, and after engine overhaul. Refer to Chapter 72-00.
© 2020 Avco Corporation. All Rights Reserved
March 2020
05-10 - TIME LIMITS / SERVICE CHECKS
Refer to Chapter 05-20
Visual Inspection
10-hour Initial Engine Inspection
25-Hour Engine Inspection
50-Hour Engine Inspection
100-Hour or Annual Engine
Inspection
400-Hour Engine Inspection
500-Hour Engine Inspection
1000-Hour Engine Inspection
Refer to the latest revision of Service
Instruction No. SI-1009 for any
changes or special circumstances for
the recommended TBO.
05-10
Page 7
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