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|  MIL-C-52973A(ME)
engine shall be capable of operating under all conditions specified herein when
using fuels and lubricants specified herein and in MIL-STD-1410, without
exceeding any of the operating limits specified herein and in table I of
MIL-STD-141O, or the engine manufacturer's recommended operating limits. An
auxillary priming system, conforming to MIL-E-52649, type III and MS39254 shall
be furnished.
3.9.2 Fuel tank.
As specified, a fuel tank with a capacity for not less then
8 hours of operation at rated load shall be provided (when tested in accordance
with 4.5.2.13).
3.9.3 Drive.
The compressor shall be either direct or multiple V-belt drive.
When a direct drive is used, a flexible coupling shall be installed between the
power unit and compressor unit. The power unit shall have a means for belt
removal and adjustment when V-belt drive is used.
3.9.4 Exhaust system.
The exhaust system shall be designed to present minimum
hazard to the operator while starting, operating, or making minor adjustments to
The system shall include a muffler
the engine or compressor unit while running.
The spark
and a spark arrestor, or a combination muffler and spark arrestor.
arrestor shall conform to the US Department of Agriculture, Forest Service
Standard 5100-1.
The total backpressure of the exhaust system shall not exceed
the maximum recommended by the engine manufacturer. The complete exhaust system
shall be protected from the entry of rain,
3.10 Air systems.
A flexible noncorrosive hose of proper diameter
3.10.1 Air induction system.
shall be provided as an air intake extension.
The hose shall not be less than 15
feet in length and shall have an adapter at one end to attach to the intake of
the compressor air cleaner while the opposite end is laying on the ground.
Provisions shall be made for storing the hose inside the compressor frame when
the compressor iS not in use.
A means for preventing foreign objects from
entering the flexible hose shall be provided.
3.10.2 Cooling.
Cooling shall be provided by a fan or fans directing an air
The inter-
blast over the compressor, intercoolers(s), and aftercooler(s).
cooler(s) shall be furnished to cool the air between stages and each shall be
equipped with a safety valve to protect the low pressue cylinder in case of
failure of the high pressure cylinder valves.
The aftercooler(s) shall be
The air
furnished between the compressor air discharge and final filter.
temperature measured at the inlet of the final filter shall not exceed 135 F
under all operating conditions specified herein.
3.10.3 Final filter.
The final filter shall be mounted vertically and
installed downstream of all other pneumatic system components, and shall be
designed for a working pressure of 5000 psi and a test pressure of 8300 psi.
With the compressor delivering air at rated capacity, under all operating
conditions specified herein, the filter element shall provide air conforming to
the purity requirements of BB-A-1034, grade C, ASTM F 307, and NAVSEA 0994-LP-
001-9010 for a period of not less than 80 hours, except that the total water
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