TO 00-25-172 - Robins Air Force Base

TO 00-25-172
craft. Gradually increase the delivery pressure until the
gauge on the low side of the unit regulator indicates
425 psig. After the flow to the aircraft system has
stopped, the gauge on the cart should indicate pressure
of the aircraft system. A final check should then be
made by checking the gauge at the oxygen regulator in
the aircraft.
b. Eye protection (safety goggles, safety glasses with side
shields, or face shield) shall be worn by personnel performing
oxygen servicing at aircraft connection point.
c. Gaseous oxygen servicing hose does not sufficiently
provide a stable ground. Statically ground the Gaseous
Oxygen Servicing Cart to a common ground before
connecting servicing hose.
d. Personnel shall observe aircraft oxygen gauges at all
times during servicing operations to prevent overfilling
of tanks.
NOTE
If the aircraft oxygen system gauges can be observed
to prevent overfilling while stationed at the
oxygen-servicing unit, such as T-37 aircraft, one
person can accomplish the servicing.
e. Personnel shall be stationed at the oxygen servicing
unit at all times during servicing operations to shut off
unit valves immediately upon receiving a command
from the personnel watching the aircraft system gauges.
4.17 LIQUID OXYGEN SERVICING.
Liquid oxygen servicing refers to a LOX bottle exchange on
the aircraft or a LOX cart servicing operation. For LOX
bottle exchange operations, the operator is only required to
wear eye protection (goggles or face shield). LOX cart servicing
is not allowed during the fuel servicing portion of a
CSO. For servicing with a LOX cart, the following procedures
apply:
• LOX will freeze and seriously damage human
skin tissue upon contact.
• If LOX spills on asphalt or concrete expansion
joint sealant, stop servicing or other operations
within a 20-foot radius of spilled area. Do not
walk or roll equipment over area of spill for at
least 30 minutes (minimum) and until all frost
and fog appearance has disappeared.
NOTE
Do not attempt to rewarm parts of the body that
have been frozen by contact with liquid oxygen.
Prevent further injury to the frozen area. Transport
immediately to the emergency room of the nearest
medical facility.
a. Fire Protection. Ensure a serviceable 150-pound
wheeled Halon 1211 fire extinguisher or equivalent is
placed within 50 feet of the LOX servicing operation.
When servicing LOX in an exercise or training
environment, chemical warfare defense ensembles
and other chemical warfare suits, including chemical
warfare masks, will not be worn, even underneath
other coverings; they must be removed prior
to LOX flow and not be donned until the lines are
disconnected.
b. Protective Clothing and Equipment. When transferring
LOX, personnel shall wear headcovering, eye protection
(safety glasses with side shields or goggles), face
shield or locally purchased hard hat face shield combination,
gloves, leather, welder’s gauntlet cuff (A-A-
50022B) (NSN 8415-00-268-7860) medium with
gloves, cloth, work, cotton knit (A-A-55213) (NSN
8415-00-964-4760) medium as an insert; or gloves,
leather (NSN 8415-00-268-7871) with glove inserts,
wool (NSN 8415-00-682-6673) or equivalent; apron
(NSN 8415-00-082-6108), coveralls, white cotton, or
cuffless trousers and long sleeve shirt or jacket and
• Do not allow LOX to contact petroleum products
as fire or explosion may result.
4-16