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![]() TM 55-4940-353-13&P
CHAPTER 1
INTRODUCTION
SECTION I. GENERAL INFORMATION
1-2.
Scope. The test unit is suitable for conducting
1-1.
General. This manual provides the information
necessary to install, operate and maintain the Model 321
proof pressure and leakage test on aircraft and missile
Hose Tester designed and built by Avitech Inc. The
hose assemblies which conform to MIL-H-8788, MIL-H-
Hose Tester has been assigned P/N 321A, NSN 4940-
8790, and MILH-8795.
01-064-5057.
SECTION II. DESCRIPTION AND LEADING PARTICULARS
1-3.
Description. The P/N 321A Hose Tester
the test oil to the desired level. The noise created by
the air being exhausted from the pump is reduced to a
consists of a five and one-half gallon oil reservoir, an
reasonable level by a pneumatic muffler installed in the
air-operated pump, pressure gages, control valves, and
air exhaust port of the pump.
adaptors interconnected to supply, measure, and control
the delivery of high pressure oil to the hose under test.
At the completion of the test the oil is returned to the
1-5.
Reservoir. Test oil which conforms to MIL-H-
reservoir for reuse.
5606 or MIL-H-82382 is stored in the five and one-half
gallon aluminum reservoir. The 12-inch long x 9-inch
1-4
Air-Operated Pump. The pressure of the oil
wide x 12-inch high reservoir acts as a base for the
Hose Tester, and all the other components are mounted
discharged from the pump is directly proportional to the
to it. The reservoir is provided with a sight gage which
input pressure of the operating air. In this case, the ratio
shows the full level, and a fillvent strainer is mounted on
is 150:1. A shop air supply of 50 standard cubic feet per
the top surface. A 10-micron oil filter is installed within
minute (scfm) at a gage pressure of 100 pounds per
the reservoir on the oil supply line to the pump. The
square inch (psig) must be available to operate the
element of this filter is replaceable.
pump.
1-6. Instrumentation. The operating air pressure is
The input air is filtered through an air filter built into the
Hose Tester and the pressure controlled by a pressure
measured by a 0 to 160 psi air gage connected in the air
regulator. The air then passes through a lubricator
regulator outlet, prior to the lubricator. The test oil
before being directed to the pump. The air actuates a
pressure
piston in the pump which in turn raises the pressure of
1-1
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