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Nov 30/06 4C12
51-10-00
PIPER AIRCRAFT, INC.
PA-28-161, WARRIOR III
MAINTENANCE MANUAL
Type of Material Type of Corrosion Remedy
(2)
Steel. Rust
(1)
. Complete removal of
corrosion by mechanical
means.
Aluminum. White to grey powdery material. Mechanical polishing or
brushing with material
softer than aluminum.
Magnesium White powdery snow-like Mechanical polishing or
(highly susceptible mounds and white spots. brushing for a smooth
to corrosion). finish.
Cadmium (plating). White to brown to black mottling Mechanical removal of
of surface (plating is still corrosion is limited to metal
protecting until iron appears). surfaces from which
cadmium has been
depleted.
Chromium (plating). May pit in chloride environment. Polishing and buffing.
— NOTES —
(1) Red rust generally shows on bolts, nuts, and other aircraft hardware. Rust in these areas is
generally not dangerous, however, it shows a need for maintenance and the possibility of
corrosive attack in more critical areas. Any surface corrosion on highly stressed steel parts is
potentially dangerous. A careful removal of corrosion using mild abrasives (rouge or fine grit
aluminum oxide paper) is necessary. Do not overheat metal when removing corrosion.
(2) For abrasion, do not use dissimilar material (for example steel wool on aluminum). Remove
only material required to clean affected area.
CHART 1
TYPES OF METAL CORROSION
(4) A clean aircraft will resist corrosion better than a dirty one. Cleaning frequency depends on
several factors, including geographical location, type of operation, etc. Remove soil as soon as
possible, especially when in a high temperature area.
(5) After cleaning, verify that no cleaning solution remains in any holes, crevices, or joints as it
may lead to increased corrosion. All exposed areas (landing gear, flap tracks, control surface,
hinge parts, etc) must be lubricated after cleaning.
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