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IO-390-D Series Engine Installation and Operation Manual
Either a field run-in or a factory run-in procedure is done to ensure that the engine meets all
specifications and is operating correctly. Since a run-in is done on new, rebuilt or overhauled
engines shipped from Lycoming Engines, the field run-in is not necessary. However, a field run-in
procedure herein is done only on engines in the field after any of the following:
• A field-overhauled engine is installed
• Field disassembly and reassembly of the engine for any repair, component replacement, or
inspection that requires separation of the crankcase halves
NOTICE: Refer to the latest revision of Service Instruction No. SI-1427 for any additional details
on the field run-in.
Field Run-In Procedure
Field run-in of fixed wing aircraft includes two procedures, "Preparation for Ground Operational
Test with Engine Installed in Aircraft" and "Ground Operational Test."
1. Preparation for Ground Operational Test with Engine Installed in Aircraft
NOTICE: The engine pre-oil procedure in the "Engine Installation" chapter in this manual
must be already completed before the ground operational test can be done.
A. Ensure that all engine instrumentation is calibrated to ensure accuracy.
CAUTION
B. Install engine intercylinder baffles, airframe baffles/seals, and cowling. All baffles and
seals must be in new or good condition to ensure sufficient cooling airflow differential
across the engine.
C. For optimum cooling during the ground operational test, use a test club propeller. If a test
club is unavailable, a regular flight propeller can be used as long as cylinder head
temperatures are monitored closely.
2. Ground Operational Test
NOTICE: Before the ground operational test, the oil cooler system must not have any air locks.
A. Before the start of the ground operational test, examine the oil cooler, propeller, and
governor for metal contamination. These parts must be clean and free of contamination
before the ground operational test can begin. If the engine had failed before overhaul, the
oil cooler, propeller, and governor must be replaced or cleaned and examined by an
approved repair facility.
B. Put the aircraft in a position facing the wind.
C. Start the engine and look at the oil pressure gage. If sufficient oil pressure indication (per
Appendix A, Table A-2) is not shown within 30 seconds, stop the engine. Identify and
correct the cause.
© 2020 Avco Corporation. All Rights Reserved
March 2020
FIELD RUN-IN
MAKE SURE THAT ALL VENT AND BREATHER LINES ARE
INSTALLED CORRECTLY AND ARE SECURELY IN PLACE IN
ACCORDANCE WITH THE AIRFRAME MAINTENANCE
MANUAL.
Field Run-In
Page 25
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