MIL-PRF-52109H
guarded or insulated. Hot surfaces shall not be positioned near material that is flammable or that
could be melted. The fuel fill port shall be located to allow refueling without the need to open
any panels or doors. Fuel tanks shall be positioned to prevent spills or overflows from running
onto the engine, exhaust, or electrical components. Exhaust or discharges from the equipment
shall be directed away from the operator s position. Electrical equipment shall be effectively
guarded and grounded to prevent electrical hazards.
3.5.2 Noise limits. Steady-state noise produced by the pump shall not exceed 85 decibels
(dB (A)) at the operator s position and at occasionally occupied positions. If noise levels are
between 85 and 90 (dB(A)), or if procedures for noise suppression have been pursued and
documented to the satisfaction of the procuring activity and written permission to exceed the
85 dB(A) limit has been obtained, noise hazard signs shall be prominently displayed on the
equipment. Signs shall state:
DANGER
HEARING PROTECTION REQUIRED
WITHIN XX FEET
The word DANGER shall be on the first line and shall be white lettering on a red oval
background, which is inside a black rectangular panel in flat or lusterless colors. Other lettering
shall be in black on a white background in lusterless colors. FED-STD-595 may be used for
guidance. All lettering shall be readable at the maximum distance at which a noise level of
85 dB (A) is measured and this distance shall be inserted for XX.
3.5.2.1 Noise suppression methods. Any method of noise suppression may be used as
long as all components used by the operator are easily accessible without the use of tools. The
throttle control assembly shall be accessible and the pump assembly shall not exceed the required
noise level while operating at any set position. An enclosure shall be used as a last resort to
noise suppression; it shall be easily removable, for required field maintenance, and shall include
external provisions for carrying the pumping assembly. If the pumping assembly is enclosed,
adequate ventilation shall be provided so that the temperature inside the enclosure does not
exceed 150 F. Any noise reducing insulation used shall be non-flammable, non-combustible,
vermin proof, and shall not absorb fuel and oil.
3.5.3 Handling. The pumping assemblies shall be designed to permit easy accessibility
for maintenance and service in the field. The design shall prevent conditions hazardous to
personnel or deleterious to equipment. The pumping assembly shall have a means of being
carried by personnel. If the total weight of the pumping assembly is less than or equal to 200
pounds, the assembly shall be labeled or stenciled "MOS 92 - 2 PERSON LIFT". If the total
weight of the pumping assembly is between 200 and up to 300 pounds, the assembly shall be
labeled or stenciled "MOS 92 - 3 PERSON LIFT". The weight of the pumping assembly shall
be labeled or stenciled on the assembly (separate from the data plate requirement of 3.5.4). If a
noise enclosure is used, any access panels or doors shall be labeled or stenciled to indicate the
items accessed through them.
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