section. Since AMEs operate this equipment, they
must be familiar with purging and sampling
procedures as well as operation of the equipment
while servicing aircraft oxygen systems.
The following safety precautions must be
observed when handling LOX.
1. Never allow LOX to contact your skin. The
extremely low temperature of the liquid quickly
freezes skin, and severe frost bite results. If your
skin is splashed with LOX, immediately flush the
area thoroughly with water, and then obtain first
2. Always store LOX with the vent valve
open. Relief valves on the tank protect the tank
in case of malfunction, and are not to be used as
3. Never confine LOX in piping or a
container without adequate safety devices. When
the liquid expands to a gas, the pressure
buildup will rupture most piping, tubing or
4. Comply with all safety directives. Fifty feet
away is the safe distance to permit smoking, open
flames, or sparks in a LOX handling area. Assure
that painting and markings on the LOX tank are
maintained as required. Oxygen gas does not
burn, but it vigorously supports combustion of
any material that does burn.
5. Keep LOX away from absorbent materials,
loose clothing, or rags. These materials can trap
oxygen gas and later be ignited by a spark,
cigarette, or match.
6. When LOX equipment is in use, keep it in
a well ventilated area away from all gasoline,
kerosene, oil, grease, and other hydrocarbons.
These substances are not compatible with LOX.
Spontaneous ignition may result from contact
with these substances.
Figure 5-5.Liquid oxygen servicing trailer, type 7.