IO-390-D Series Engine Maintenance Manual
05-20
© 2020 Avco Corporation. All Rights Reserved
Page 24
March 2020
IO-390-D Series Engine Maintenance Manual
100-Hour or Annual Engine Inspection Checklist for IO-390-D Series Engines (Cont.)
Inspection Item
Comments
Results/Notes
Done
EIS (Cont.)
Inspect ignition harness
connection to EIS.
If Back-Up Battery System is
installed, ensure it is being
maintained or inspected in
accordance with its ICA.
Magneto (Optional)
WARNING
IF THE P-LEAD IS DISCONNECTED, THE MAGNETO WILL BE ON AND
WILL ACTIVATE THE SPARK PLUG IF THE PROPELLER IS TURNED.
TO PREVENT INJURY, MAKE SURE THAT THE P-LEAD IS SECURELY
ATTACHED TO THE CONDENSER STUD.
Make sure that the magneto-to-
engine timing is correct. Adjust
the timing as necessary.
Refer to the "Magneto-to-Engine
Timing Check” in Chapter 74-30.
The correct advance timing is
stamped on the engine data plate.
Complete a visual inspection of
the magneto wiring conditions
and connections, vent holes, and
P-lead attachment.
Clean the magneto vents to make
sure that there is no obstruction.
Make sure the magneto clamps
securely attach the magneto to the
engine.
Make sure that the switch wire on
the retard (left) breaker connects
the retard contact points to the
ignition vibrator.
Applies to traditional magnetos.
Electrical System
Complete the wiring inspection.
Refer to the section “Wiring
Inspection” in Chapter 72-70.
Examine the alternator belt(s).
Refer to the section "Alternator
Belt Inspection" in Chapter 72-
70.
Complete a check of the
alternator belt tension.
Refer to the "Alternator Belt
Tension Check/Adjustment"
section in Chapter 72-70.
Examine the alternator attaching
hardware for damage. Make sure
that safety wire/cable and cotter
pins are installed and tight.
