NAVAIR A 1 - NAO S H - S A F - 0 0 0 / P 5 1 0 0 / 1 ,
LOX converters and servicing trailers should be
stowed or parked so that they are protected from
N AV A I R O S H R e q u i r e m e n t s f o r t h e S h o r e
excessive heat and direct rays of sunlight as much as is
Establishment
practical. All LOX should be segregated from
NAVAIR 06-30-501, Technical Manual of
containers of other gases or liquids and all flammable
Oxygen/Nitrogen Cryogenic Systems
materials. Hydrocarbons such as oil and grease in the
oxygen handling area could result in death, serious
All personnel handling oxygen and maintaining
injury, and property damage.
gaseous or liquid oxygen systems should be thoroughly
familiar with all precautions and procedures listed in
Smoking, open flames, or sparks are not permitted
the latest revisions to these publications. They also
in any oxygen handling area. When transferring
should be familiar with the specific precautions
oxygen, provide adequate ventilation to prevent the
provided in the applicable aircraft MIM and those
formation of an oxygen-enriched atmosphere.
pertaining to the type of equipment being used to
Avoid spilling LOX on floors or deck areas. In case
service such systems.
of accidental spillage, ventilate the area. Intentional
draining of LOX from a system or container must be
SYSTEM COMPONENTS
caught in a clean drain pan and allowed to evaporate in
a suitable open area that will not present a hazard.
Aircraft LOX systems are similar to gaseous
oxygen systems except that the several cylinders of
In the event that LOX is spilled on clothing,
gaseous oxygen are replaced by one or more LOX
separate clothing from skin contact immediately and
converters. The use of more than one converter
thoroughly air clothing for 1 hour to allow dilution of
provides for an adequate supply of oxygen on
the oxygen concentration. When an uninsulated
long-range flights or where there is more than one
container of LOX is touched or when there is any
crewmember using the oxygen systems. In addition to
reason to suspect some part of the body has been frozen
the converters, most LOX systems contain a heat
or chilled, the area should be thoroughly washed or
exchanger; filler, pressure control, relief, and shutoff
immersed in clean water that is slightly above body
valves; quick-disconnect couplings; low-pressure
temperature (approximately 104F to 113F). The
switch; oxygen lines and regulators; and quantity
exposed area should then be loosely wrapped with a
indicating units. See figure 7-7 for a schematic diagram
clean, dry dressing, and medical aid should be sought
of a LOX system.
immediately.
When servicing and maintaining LOX systems, the
AME will be required to transfer LOX from servicing
trailers to aircraft converters, and occasionally from the
converter to the drain pan. The AME also will be
required to remove and install converters and other
components of LOX systems. All servicing and
maintenance of LOX systems must be done in
accordance with instructions contained in the
applicable aircraft MIM. All safety precautions
concerning the handling of LOX must be adhered to.
When a completely empty system is being
serviced, the LOX should be added slowly to cool the
converter down to the storage temperature (297F).
The converter could otherwise be damaged by thermal
shock or rapid pressure buildup.
Additional gaseous and liquid oxygen safety
precautions and handling procedures are provided in
Figure 7-7.--LOX system schematic.
the following publications:
7-11
