TO 00-25-172 - Robins Air Force Base

TO 00-25-172
shoes which fit closely around the top, with rubber
soles and heels (no mech sides or air holes). All items
shall be clean and free of grease, oil, and fuel.
NOTE
• The above NSN data is for gloves sized “medium”.
Other sizes may be ordered as required,
but all sizes must meet the criteria of the federal
specification and military specification
identified above. Locally purchased certified
cryo gloves from lab safety, NSA elbow cryogen
gloves or elbow gloves from tempshield
cryo gloves, are approved and can be ordered
via internet.
• A BDU cap is recommended as head covering
when LOX servicing connections are above eye
level since it would afford more protection than
the adjustable style cap with open back, typically
worn as organizational head covering.
Mesh caps are not authorized.
• The wool glove insert and cotton knit cloth
work gloves used as inserts can be used interchangeably
with either welder’s gauntlet cuff
leather gloves or leather gloves specified above.
• A leather boot approximately 8 inches in height
with close fitting top and rubber sole and heel
is recommended, since LOX spills normally
subject one’s foot area to a freeze burn exposure
hazard. This type footwear when equipped
with a hard protective toe area is generally
classified as a safety shoe or boot.
c. LOX servicing hose does not sufficiently provide a
stable ground. Statically ground the LOX Servicing
Cart to a common ground before connecting servicing
hose.
f. Should a control valve become clogged with ice, thaw
with water.
g. LOX servicing equipment should be purged to make
sure no moisture is introduced into a liquid oxygen
system and there is no moisture in or on filler fittings,
nozzles, or valves where it may enter the aircraft system
during servicing operations. When servicing several
aircraft, one immediately after the other, the LOX
servicing equipment need only be purged prior to first
servicing operation.
h. Before filling the aircraft system, insure that the pressure
relief valve on the LOX supply tank is operating
properly.
i. A steady drip from the servicing nozzle aircraft filler
valve connection that can be contained in a drip pan is
acceptable. The drip can sometimes be eliminated by
holding the hose, thereby removing the downward tension
from the connections.
NOTE
Present aircraft liquid oxygen servicing connections
cannot be made absolutely leak tight because
of basic design deficiencies. Valves should not be
discarded solely because of leaking connections.
Perform a leak check on the female filler valve in
accordance with TO 37C2-4-6-13 or TO 37C2-4-
6-21 as appropriate.
j. Leaks which result in LOX running down the servicing
nozzle or the side of the aircraft or which result in
LOX spraying from the connections are dangerous.
Leakage from any component or connection is a potentially
dangerous situation.
Drip pans shall be kept clean and not be utilized
for any purpose other than LOX servicing. Any
residual LOX in drip pan should be allowed to
boil off and not be poured off.
d. Service area shall be well ventilated, free of oil, grease,
and fuel vapors.
e. A drip pan shall be placed under oxygen overflow vents
to prevent contact of the LOX with oil or grease, which
may be on the ramp.
Allow the LOX system to stabilize (vent) after
servicing for at least 30 minutes prior to use,
buildup, or reading any gauges. Failure to do so
may cause valve blockage from moisture and lead
to system damage or injury to personnel.
k. The oxygen-servicing unit shall be disconnected from
tow vehicle and located at the maximum distance from
the aircraft permitted by the hose length. Hoses shall
be kept free of kinks and sharp bends at all times.
LOX hoses shall be drained and capped immediately
after use.
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