main wheels. These screens help prevent damage or
injury if a blowout occurs. If the tire is flat, explosive
failure of the wheel or tire will not result. However,
upon sudden cooling, an overheated wheel may
fracture or fly apart, which could hurl bolts or
fragments through the air with sufficient speed to
Required personnel should approach overheated
wheels with extreme caution in the fore or aft
directionsnever in line with the axle.
NOTE: The area on both sides of the tire and
wheel, in line with the axle, is where the fragments
would be hurled if the tire were to explode. Therefore,
it is called the danger area (fig. 5-14).
Heat transfer to the wheel will continue until the
brake is cooled. Therefore, the danger of explosive
failure may exist after the aircraft is secured if the
overheated brake is not cooled. The recommended
procedure for cooling overheated wheel, brake, and
tire assemblies is to park the aircraft in an isolated
location. Then, allow the assembly to cool in ambient
air for 45 to 60 minutes. Cooling agents should not be
used to accelerate cooling unless operational necessity
dictates their use. If such an operational necessity were
to occur, the cooling should be supervised by someone
in the AM rating.
Never use CO2 to cool overheated brakes.
A violent explosion can occur.
Liquid Oxygen (LOX)
When working with or around liquid oxygen, you
must take the following safety precautions:
Do not operate liquid oxygen equipment unless
you are qualified, licensed, or working under the
supervision of qualified personnel.
Do not permit smoking, open flames, or sparks
in the liquid oxygen handling areas.
Do not carry matches in liquid oxygen handling
Always call oxygen by its proper name. Do not
confuse it with compressed air. Never use oxygen in
place of compressed air for any purpose.
Handle converters, storage tanks, and transfer
equipment with care to avoid damage to the insulating
Keep work areas and equipment free from oil,
grease, or any other combustible material.
Keep tools and clothing free from oil and grease.
Avoid spilling liquid oxygen on the floor or deck
areas. In case of accidental spillage, ventilate the area
If the body comes into contact with liquid oxygen
or there is reason to suspect some part of the body has
been frozen or chilled, thaw the exposed area, preferably
by immersion or by bathing it in water that is slightly
above normal body temperature. Then wrap the exposed
area loosely with a clean, dry dressing. Report to a
doctor immediately. Do not apply anything else to the
affected area other than a clean, dry dressing.
Liquid oxygen can explode when it comes
into contact with oil or grease.
LOX Protective Clothing
Protective clothing allows you to work safely with
LOX. Wear clothing in the following ways:
Wear goggles or safety glasses with side shields
or a face shield when handling LOX.
If LOX is spilled on clothing, remove the
clothing immediately and air it promptly. In general,
wear all clothing so that, if there were spillage, the liquid
would roll off the clothing and not become trapped in
gloves, shoes, or pockets. Other items of protective
clothing are plastic or rubberized fabric aprons, high-top
shoes or rubber boots, and cuffless trousers worn
outside the shoe tops. The clothing should not have
pockets, and sleeves and trousers should not be rolled
Do not handle with your bare hands any tubing
or fittings through which LOX is flowing. Wear clean,
dry gloves when handling parts of equipment cooled by
LOX. Use loose-fitting leather gloves so they can be
thrown off quickly if any of the LOX gets into them.