Tue, Aug 29, 2006
Aero-Tips!
A good pilot is always learning -- how many times have you heard
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didn't "stick" the way it should have the first time we memorized
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Aero-Tips 08.29.06
Corrosion in a metal aircraft
structure can significantly reduce that structure's ability to
carry flight loads. In not-too-extreme cases of corrosion control
difficulty or even in-flight structural failure can result from
corrosion. Corroded materials fatigue at a much faster rate than
normal, further reducing stress-carrying capability. So what should
we look for when preflighting an airplane?
Surface corrosion comes in several forms:
- Surface corrosion. This is corrosion that
covers a wide area of unprotected metal. If paint is old and
cracked, admitting moisture to metal and trapping moisture against
the metal under loose flaps of old paint, the metal can corrode
dangerously. Look for any discoloration, dullness or "dustiness" of
metal around scratches or gaps in aircraft paint.
- Filiform corrosion. This is an elongated area
of corrosion along an imperfection in metal. It is sometimes called
"worm" corrosion because the tracks of corroded material look like
worms under the paint surface. Sometimes it forms complete circles,
or rings.
- Dissimilar metals corrosion. Different types
of metals exchange electrons at different rates, leading to
impurities in the metal joints that is a form of corrosion. Look
for brittle-looking lines or dustiness in areas where metals come
together. This sometimes results in "smoky", or black-dusted rivets
in a metal structure.
If corrosion is forming pits, or noticeable breaks or holes in
the metal, the airplane should not be flown until it can be
addressed and repaired by a mechanic. If smokiness or discoloration
is present, but there is no pitting, ask a mechanic to take a look
unless you're very familiar with the symptoms and effects of
corrosion. All surface corrosion should be treated as soon as its
discovered to prevent spreading. A trained mechanic should inspect
adjacent areas for corrosion that may be less visible.
Aero-tip of the day: Watch for corrosion during
your preflight inspections.
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