TO 00-25-172 - Robins Air Force Base

TO 00-25-172
the LIN is slightly bluish, it is to be considered contaminated
with oxygen. In this case, the LIN shall require
the same handling procedures as LOX.
may overcome sensory recognition, the odor cannot be relied
upon as an indication or warning of overexposure.
Drops or splashes of LIN will freeze skin tissue.
NOTE
Do not attempt to rewarm parts of the body that
have been frozen by contact with liquid nitrogen.
Prevent further injury to the frozen area. Transport
immediately to the emergency room of the nearest
medical facility.
d. When LIN is being transferred from one container to
another, the receiving vessel shall be filled as slowly
as possible to minimize the thermal shock that occurs
when any material is quickly cooled.
e. When moving the LIN servicing unit, all valves, except
vent valves shall be closed and shall not be opened
until the unit is in the working area.
f. LIN servicing units shall be positioned to prevent accidental
damage to the aircraft or equipment.
g. LIN servicing equipment shall not be left unattended
after hook-up.
h. Should a control valve become clogged with ice, thaw
with water.
i. Insure that no moisture is introduced into a LIN system
and that there is no moisture in or on fittings,
nozzles, or valves where it may enter the aircraft system
during servicing operations.
j. Before filling the aircraft system, insure that the pressure
relief valve on the LIN supply tank is operating
properly.
4.22 HYDRAZINE SERVICING.
NOTE
Refer to TO 42B1-1-18 for hydrazine neutralization
and dilution guidance.
Hydrazine is a widely used industrial chemical and is very
corrosive and hypergolic. Hydrazine appears as a clear, oily
liquid having an ammonia-like odor. Since individual sensitivity
to the odor may vary, and since prolonged exposure
Skin contact with liquid hydrazine or exposure to
concentrations of hydrazine vapor present a serious
health hazard.
NOTE
Hydrazine is hazardous because it may enter the
body via lungs (breathing), gastrointestinal tract
(swallowing), or through the skin (absorption).
Additionally, there is a fire hazard present with
hydrazine-water mixtures. (See step c.)
a. Short Term (acute) Overexposure. If exposed to high
concentrations of hydrazine for short periods, dizziness,
nausea, or irritation of eyes, nose, throat, or lungs
may result. Liquid contact may cause skin burns. In
very high concentrations, unconsciousness may occur.
b. Long Term (chronic) Overexposure. If exposed to concentrations
of hydrazine vapors above permissible exposure
limits over long periods, damage to kidneys and
liver may occur. Frequent skin contact with liquid hydrazine
may also result in damage to kidneys and liver.
A yellow discoloration of skin and eyes may be apparent.
Refer to TO 42B1-1-18 for a summary of health
effects and for guidance covering the handling and use
of hydrazine.
c. Fire Hazard. The 70 percent hydrazine and 30 percent
water mixture used in the F-16 EPU is a flammable
mixture. Fires involving hydrazine can be fought and
extinguished with common extinguisher agents. Water
is the preferred agent for fire suppression.
4.23 HYDRAZINE PROTECTIVE CLOTHING AND
EQUIPMENT.
Air-supplied respirators are required for those operations in
which engineering controls and work practices are not sufficient
to reduce exposure below the permissible exposure
limits. If respirators are used, they must meet the requirements
of AFOSH STD 48-137 and TO 42B1-1-18. Because
hydrazine can be absorbed through the skin, it is necessary
to wear approved clothing during those situations where there
may be contact with the liquid. Protective clothing approved
for handling hydrazine is discussed in TO 1F-16( )-2-49GS-
00-1, Protective Clothing for Handlers of Missile Fuels and
Oxidizers. Occupational health requirements are outlined in
TO 42B1-1-18.
4-20