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IO-390-D Series Engine Maintenance Manual
IO-390-D Series Engine Maintenance Manual
Guidelines for Identification of Metal Particulates and Chips & Corrective Action
Metals/
Tests & Characteristics
Alloys
Lead
Aluminum
When placed in 50%
flakes
solution of nitric acid
and muriatic acid
(approximately 30%
hydrochloric acid and
water), or a sodium
hydroxide solution, the
aluminum particles
bubble and fizz and form
a black residue
Magnesium
Tin
Soft, malleable
Not picked up by magnet
When dropped onto a
hot (500◦F) soldering
iron, tin particle will
melt and fuse with 50/50
solder
Cadmium
Zinc
© 2020 Avco Corporation. All Rights Reserved
March 2020
Table 2 (Continued)
Possible Source of Origin
on Lycoming Engine
Bearings
Crankcase
Accessory housing
Oil pump body
Cylinder head
Pistons
Piston pin plugs
Oil sump baffle
Turbocharger inlet housing
Sleeve bearings
Oil sump
Tin-plated parts
Plating
Plating
Next Step
If lead chips, chunks,
or balls are found,
complete Corrective
Action 4 in Table 4.
Refer to Table 3 for
the quantity and size
of the particles
Refer to Table 3 for
the quantity and size
of the particles
Refer to Table 3 for
the quantity and size
of the particles
Refer to Table 3 for
the quantity and size
of the particles
Refer to Table 3 for
the quantity and size
of the particles
12-10
Page 77
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