IO-390-D Series Engine Maintenance Manual
© 2020 Avco Corporation. All Rights Reserved
05-20
March 2020
Page 13
IO-390-D Series Engine Maintenance Manual
Visual Inspection Checklist for IO-390-D Series Engines (Cont.)
Item
Comments
Findings/
Corrective Action
Done
Crankcase
Examine the external surface of the
crankcase for damage, cracks.
Replace a damaged or
cracked crankcase.
Replace the crankcase if
there is any raised metal
on surfaces.
Replace the crankcase if
there is any scratch,
ding, dent, or pit that
exceeds 0.050 in. (1.27
mm) depth.
Accessories and Accessory Housing
Examine the accessory housing and
its attached accessories for damage.
Replace damaged
accessories or accessory
housing.
Visually examine the alternator,
alternator belt, and attaching
hardware.
Refer to Chapter 72-70.
Wiring Harness
Examine the wiring harness for
correct attachment to the electrical
connectors and engine. Look for
broken or frayed wire, signs of
chafing, deterioration, abrasion or
heat-related damage.
Replace the wiring
harness if it is frayed,
broken, chafed, abraded,
or damaged per the
aircraft manufacturer’s
instructions.
Make sure wiring harness clamps are
secure and not worn or damaged.
Tighten any loose clamps. Replace
any worn or damaged clamps.
Make sure that securing straps, and
lockwiring are attached correctly
and tightly.
Induction System
Make sure that the induction system
is in satisfactory condition. Ensure
that all clamps and hardware are
securely fastened and that there is
no evidence of leakage or staining.
Refer to the “Induction
System Inspection” in
Chapter 72-80.
In accordance with the aircraft
manufacturer’s instructions,
examine the induction air filter for
cleanliness, security, and
indications of damage.
