TM 1-1500-204-23-4
(6) Ensure that all unauthorized personnel
are clear of area before opening valves or energizing
electrical circuits for starting machinery.
(7) Suitable mechanical guards, such as
enclosures or barricades, shall be permanently installed
on all machinery not already equipped with such to
eliminate danger of injury from moving parts.
(8) Machinery shall not be adjusted,
repaired, oiled, or cleaned while machine is in operation
or power is on.
(9) Personnel operating machinery shall
wear protective clothing as prescribed. A protective
face shield or goggles shall be worn when operating a
grinder regardless of whether grinder is equipped with
attached shields.
(10) Jewelry shall not be worn while
performing any maintenance.
(11) All electrical binding posts shall be
insulated, covered, and clearly marked with voltage and
current values.
(12) Do not lay soldering irons down except
on a holder. Always unplug soldering irons before
leaving work stations. Soldering irons shall not be left
on for extended periods.
(13) Shop humidity should not be higher
than 50 percent, and temperature should be maintained
at approximately 77 °F (25 °C).
(14) Shop must be kept as clean and dust-
free as possible.
d. Fire Safety. A constant vigilance must be
maintained to seek out fire hazards. Fire hazards are
constantly present in the shop where sparks, friction, or
careless handling can cause an explosion that may
destroy equipment or buildings, and injure or kill
personnel. The following fire safety practices shall be
observed:
(1) NO SMOKING signs shall be placed in
areas where smoking could create a fire hazard.
(2) Personnel shall be trained in the use,
knowledge, and location of shop fire fighting equipment.
(3) Each shop shall be equipped with fire
extinguishers suited for type fire most likely to occur.
(4) Use correct fire extinguisher for class of
fire as follows:
·
Class A fire (wood, paper, trash,
etc).
Use
water
or
bromotrifluoromethane
fire
extinguisher.
·
Class B fire (oil, paint, fuel,
grease,
etc.).
bromotrifluoromethane or carbon
dioxide fire extinguisher, or dry
chemical extinguisher with Class
B rating.
·
Class
C
fire
(electrical
equipment).
Use
bromotrifluoromethane or carbon
dioxide fire extinguisher, or dry
chemical extinguisher with Class
C rating.
·
Class D fire (combustible metals)
magnesium, titanium, zirconium,
sodium, lithium, and potassium.
Use
dry
powder-type
fire
extinguisher.
(5) Oily waste, rags, and similar combustible
materials shall be discarded in self-closing metal
containers which shall be emptied daily.
(6) Flammable materials shall not be stored
in the shop.
(7) Use only approved cleaning solvents.
4-2. Maintenance of Shop Equipment. Maintenance
of instrument shop equipment is covered in the following
paragraphs. The instructions and procedures are
general in nature. Specific maintenance instructions
that apply to particular pieces of equipment are
contained
in
applicable
operation
and
service
instructions manuals.
a. Manometers. A manometer, as shown in
figure 4-1, measures pressures, and is used for testing
and calibrating differential and absolute pressure
instruments such as altimeter, airspeed indicators, rate-
of-climb indicators, and suction gauges. Exercise care
when reading a manometer, because curvature of the
liquid level varies for mercury and water, as shown in
figure 4-2.
(1) Inspection. Inspect manometers for
damage using the following procedures:
(a) Inspect glass cover for breaks and
chips.
(b) Inspect glass tube for scratches
and dirt.
4-2
