TM 1-5855-265-20
3-24
3-8. OPTICS CLEANING PROCEDURES (cont)
d. Clean recessed optics.
WARNING
NITROGEN
• Asphyxiant: Nitrogen displaces oxygen. In a
confined area, it can cause death by
suffocation or serious injury.
• Use only in a well-ventilated area.
• If you experience shortness of breath or an
increase in heart rate, get to fresh air at
once.
(1) Blow optical surface and recessed optic
housing area with nitrogen or dry air.
WARNING
METHYL ALCOHOL
• Flammable, toxic, irritating. Can cause
breathing problems, eye damage.
• Don’t: Use near flames or sparks, let it get in
eyes, or breathe vapors.
• Do: Use in well-ventilated area, close
containers when not using. Wear acid-type
safety goggles, rubber gloves, and rubber
apron.
• If it contacts eyes, wash eyes with running
water. Get medical help at once.
• If you experience any breathing problems,
get to fresh air at once.
(2) Moisten new cotton swab with methyl
alcohol.
(3) Wipe optical surface using single
strokes in one direction only. If area
size is too large for a single swab,
moisten another and continue until
entire surface has been cleaned.
WARNING
ACETONE
• Flammable, toxic, irritating. Can cause
breathing problems, eye damage.
• Don’t: Use near flames or sparks, let it get
on skin, or breathe vapors.
• Do: Use in well-ventilated area, close
containers when not using. Wear acid-type
safety goggles, rubber gloves, and rubber
apron.
• If it contacts skin or eyes, wash affected
areas with running water. Get medical help
at once.
• If you experience any breathing problems,
get to fresh air at once.
(4) Moisten new cotton swab with acetone.
(5) Wipe optical surface using single stroke
in one direction only. If area size is too
large for a single swab, moisten
another and continue until entire
surface has been cleaned.
(6) Have optical surface inspected for
contamination.
