cannot escape the abrasive environment,
and in the presence of water vapor, the
destructive process is accelerated. Deep
grooving resembling Brinell marks or
pressure indentations may be noted. The
so-called “smoking rivet” indicates rivet
loosening with the “smoke” consisting of a
metal debris trail. This smoke trail signals
inadequate metal-to-metal fixation with
potential underlying corrosion that should
be investigated within a short (25-hour or
less service time) maintenance period.
Smoking rivets should always be replaced.
CORROSION LIMITS
Corrosion, no matter how slight, is physical
damage to metal. This damage is classified
under four standard types: ( 1) negligible
damage, ( 2) damage that is repairable by
patching, ( 3) damage repaired by insertion
of new materials, and ( 4) damage that
requires part replacement. The term “
negligible” does not imply that no action is
necessary—the corroded surface needs to be
cleaned, treated, and coated (e.g., painted) as
appropriate. Negligible damage is defined as
a change of a metal surface that is scarred or
has had the protective coating eaten away,
and the metal has noticeably begun to etch.
INSPECTION
Cleaning an aircraft and keeping it clean is
important to detect evidence of metal
corrosion. Any change in the usual color of a
metal, or a change in a coating or paint
finish, signals that metal corrosion may be
occurring. Depending on the aircraft, there
may be recurring problems noted with a
particular make and model that lead you to
do more frequent visual inspections.
Examples of these types are seaplanes,
conventional gear aircraft in which moisture
collects in the tail section, and Cessna
200-series aircraft with foam core elevators
and trim tabs.
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