The following paragraphs provide guidelines
for removal of corrosion products without
damaging the structure. Removal of corrosion
that has propagated beyond these limits requires
replacement of the part.
CADMIUM-PLATED PARTS. On cad-
mium-plated parts, corrosion will be evident as
mottling of the plated surface with color
ranging from light gray to black. This is a
function of the cadmium plating to protect the
underlying base metal, and no attempt should be
made to remove the discoloration. The presence
of exposed base metal in a localized area
is acceptable and should be protected. The
appearance of red rust is cause for part
CHROMIUM AND NICKEL-PLATED
PARTS. You should polish bright plated parts
with a fine Scotchbrite abrasive mat or 500/600
aluminum oxide abrasive cloth. Do not penetrate
to the base material. If base material is exposed,
it is cause to remove and replace the affected part.
ALUMINUM FORGINGS AND CAST-
INGS. Metal removal should not exceed 0.005
inch in depth. You should apply chemical
conversion coating (alodine) to bare surfaces and
repaint them as required.
RESTORATION OF FINISH
Abrasions and isolated damage areas may be
restored using the following procedures: First,
mask the area to be treated. You should feather
sand the area around the damage with abrasive
paper or Scotchbrite mat. Next, apply paint
remover or methyl ethyl ketone and wipe the area
dry with cheesecloth before the solvent
evaporates. At this point, if bare metal is show-
ing, you should apply alodine and allow it to dry.
Finally, apply one coat of primer and two coats
Special attention should be paid to the use of
primers, polyurethane paints, paint removers, and
methyl ethyl ketone. They are all flammable and
toxic. Do not use them near open flames or
sparks. Do not allow them to come in contact with
your skin or eyes. Their use should be restricted
to a well-ventilated area.
Safety precautions must be strictly observed
when working around aircraft equipped with an
ejection seat. These safety precautions cannot be
overemphasized. Each ejection seat has several
ground safety pins. These safety pins are provided
on red-flagged lanyards for use at every point of
potential danger. They must be installed whenever
the aircraft is on the ground or deck, and they
must never be removed until the aircraft is ready
The following general precautions should
always be kept in mind:
1. Ejection seats must be treated with the
same respect as a loaded gun.
2. Always consider an ejection seat system as
loaded and armed.
3. Before you enter a cockpit, know where the
ejection seat safety pins are located and make
certain of their installation.
4. Only authorized personnel may work on,
remove, or install ejection seats and components,
and only in authorized areas.
Supervisors take note. It has been said that
nothing is foolproof because fools are so
ingenious. Personal safety for those who work
around ejection seats cannot be guaranteed;
however, a high level of safety can be achieved
if personnel have the proper attitude, under-
standing training, and adequate supervision.
Unless proper maintenance procedures are
followed explicitly, even the most routine ejection
seat maintenance tasks can grow drastically out
of proportion and bring about an accident or
injury. Education of the workers involved is the
best assurance for personnel safety. The workers
should be made aware of potential hazards and
the proper means of protecting themselves.
Workers should be assigned according to their