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MIL-M-63988 (AR)
3.3.1.2 Leakage.  During cycling and after all cycling, no
indication of unusual hydraulic leakage shall occur.
3.3.2 Surface cleanliness.  All finish machined surfaces
shall be free of condensation or other foreign residues from the
time of final machining until final assembly; All parts and
assemblies being assembled into the completed mount shall be free
of all foreign material after assembly.  Assembly shall be
performed in the controlled environment specified in 6.3.
3.3.3 Part modification.  No parts shall be altered or
handfitted during assembly unless such modification has been
authorized by an approved-drawing change, or is authorized by
instructions presently listed on the drawings.
3.3.4 Air, gas and accumulator system.  The gas system shall
be clean and free of all foreign matter.  The hydroscopic content.
of the air used to blow the lines shall not exceed one percent of
the total volume of the air used.  The system shall be filled,
bled, and refilled until all air and measurable moisture are
eliminated.
3.3.5 Cylinder pressure.  The cylinders of the mount shall
withstand the pressures specified on the drawings without damage,
permanent deformation or leakage.
3.3.6 Pistons, rods, and nuts or collars.  The pistons,
piston rods, and nuts or collar shall withstand the pull test
specified on the drawings without permanent set or failure of the
screw threads.
3.3.7 Lubrication.  Lubricants corformint to MIL-G-10924
shall be used for the assembled mount.
3.3.8 Gas.  The nitrogen used to charge and fill the nitrogen
chamber shall conform to BB-N-411.  The charging pressure shall be
specified on Drawing 12012127. .
3.4 Performance.
3.4.1 Mechanical gymnastication.  Each mount shall be
subjected to the mechanical gymnastication test as specified in
4.6.1 without evidence of erratic movement and shall meet the
requirements of 3.4.1.1 and 3.4.1.2.  During and after
gymnastication, the gun mount shall meet the requirement of 3.4.5
and 3.4.6.
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