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IO-390-D Series Engine Maintenance Manual
IO-390-D Series Engine Maintenance Manual
Engine Inspection Checklist After Propeller Strike for IO-390-D Series Engines (Cont.)
Sequential Task
18. Complete a check of the
connecting rods
parallelism.
19. Complete a check of
connecting rod
squareness.
NOTICE: The magnetic particle inspection must be done by a certified technician as per the latest revision
of Service Instruction No. 1285.
20. Complete a magnetic particle inspection on the
crankshaft.†
21. Complete a magnetic particle inspection on the
crankshaft counterweights.†
Examine the counterweight bushing bores in
both the counterweights and the crankshaft.
22. Complete a magnetic particle inspection on the
camshaft.†
23. Complete a magnetic particle inspection on the
connecting rods.†
24. Complete a magnetic particle inspection on the
crankshaft gear.† Examine the gear end as per
the latest revision of Service Bulletin No. 475.
† Refer to the section "Non-Destructive Testing" in this chapter.
© 2020 Avco Corporation. All Rights Reserved
March 2020
Additional Information
Refer to the "Connecting
Rod/Parallelism/Squareness Check" in
Chapter 72-20 for measurement
instructions.
Record the parallelism measurement for each
connecting rod.
Replace all connecting rods not in
compliance with measurements in the latest
revision of Part I of the Service Table of
Limits - SSP-1776 (Reference 503).
Refer to the section "Connecting Rod
Parallelism/Squareness Check" in Chapter
72-20. Record the squareness measurement
for each connecting rod.
Replace all connecting rods not in
compliance with measurements in the latest
revision of the Service Table of Limits,
SSP-1776 (Reference 504).
Record test
results.
Record test
results.
Record test
results.
Record test
results.
Record test
results.
Corrective Action
Done/Comments
Parallelism Measurement
Connecting Rod 1
Connecting Rod 2
Connecting Rod 3
Connecting Rod 4
Squareness Measurement
Connecting Rod 1
Connecting Rod 2
Connecting Rod 3
Connecting Rod 4
Magnetic particle test results
acceptable
Replace crankshaft
Replace all counterweight pins,
bushings, end plates and snap rings -
regardless of their condition.
Use camshaft
Replace camshaft
Replace connecting rod bolts and
nuts - regardless of condition. Refer
to the latest revision of Service
Instruction 1458 for assembly
instructions.
Use crankshaft gear
Replace crankshaft gear
05-50
Page 61
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