Corrosion prevention
RESTRICTED
b.
Electrical
Wiring
Sight
battery.
It must be removed completely by scrap-
ing it away to the bare metal. Retouch with lac-
quer or varnish.
Rub in a small amount of bomb-
sight oil as an
emergency measure if lacquer or
varnish is not
avallable.
2. Check
for corrosion around screw heads.
If corrosion
is found it is the case, not
the
screw,
that is corroded. All screws are either
rass or stainless steel. Toc much emphasis can-
not be put on the fact that most. screws are small,
soft, and
the threads are delicate, both on the
screw
and in the hole. Always remember that you
are working on
an extremely delicate instrument.
To avoid corrosion of screw holes, dip each
screw
in
light oil before replacing.
DO NOT DIP THE SCREW IN YOUR MOUTH!
3.
If the case is dented or cracked to such
an extent that the operation of any unit is im-
paired,
the condition should be reported to the
Chief A.f. Maintenance Command and method of dis-
position
requested.
4. Remove dirt from interior of case with al-
cohol moistened cotton on a swab stick.
NEVER TRY
TO BLOW THE DUST AND DIRT FROM THE INSIDE OF THE
5. Check for corrosion
and
rust on the bare
metai. Remove condition with acid-free kerosene
crocus cloth.
Clean the surface thoroughly
with benzine and dry with a clean
clothe
Use of clean white cloths in connection with this
equipment is stressed, due to the fact that the
dyesfrom colored cloth
may easily be deposited up-
on the surfaces with which it comes in
contact
when used in conjunction with oil, solvents, etc.,
and create a dangerous chemical reaction.
Check
for frayed or burned insulation,
faulty terminals, and replace damaged parts, first
remedying
cause of the trouble.
Check terminal
for tightness, stri-
pped threads and bad
screwdriver slots. Replace
necessary.
Check
proper shaping of all wiring.
This includes pigtails and flexible leads.
flexible leads from
the case to the cardan
shape
and the
from the cardan
the guro
are S shape when there
are three and heart shaped
when there are two.
The leads must be shaped
they do not touch each other or any part of
the sight except at the connections. If the flex-
ible leads are touching each other or the metal of
CASE.
and
white
i.
the
where
3.
for
The
S
to
that
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