MIL-STD-342(AT)
5. DETAILED REQUIREMENTS
5.1 Preliminary precautions. Before flow checking parts, subassemblies, and assemblies,
the following precautions shall be observed:
a. Check for residual magnetism. Magnetism shall not exceed three (3) gauss.
b. All oil holes, grooves, and passages shall be clean and free of burrs.
c. All assembly requirements, such as the installation of o-rings and seals, correct bolt
torques, and bearing pinch, shall be met. The locking of bolts, nuts, etc. shall not
be mandatory.
5.2 Configuration. Parts, subassemblies, and assemblies requiring a flow check shall be as
specified in table I by part number and description.
5.3 Flow rate, pressure, and temperature. Flow rate, pressure, and temperature
requirements for parts, subassemblies, and assemblies requiring a flow check shall be as specified
in table I. The pressures listed in table I shall be considered as actual part, subassembly, and
assembly inlet port pressure requirements.
5.4 Procedure.
5.4.1 Pressure gage location. The pressure gage (see 4.1.3) shall be located within I inch
of the inlet port of the part, subassembly, or assembly being flow checked or on the fixture being
used.
5.4.2 Flow reading. The flow reading shall be obtained under the conditions specified in
table I. The part, subassembly, or assembly shall be verified to meet the specified flow
requirements.
5.4.3 Flow check test. All parts, subassemblies, and assemblies shall be tested as follows:
a. Determine the pressure drop across the inlet fixturing (section of line, fitting, or fixture
after pressure gage). Increase the inlet pressure by the amount equal to the pressure
drop ( P).
b. Record the flow measured with the pressure specified in table I at the part,
subassembly, or assembly.
c. Alternately apply an oil pressure of 100 and zero psig to shock the lubrication system
and to dislodge any contaminants in the feed lines. Repeat the shock cycle not less
than five times.
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