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MIL-M-63988 (AR)
3.4.4 Climatic conditions.  A sample as specified in 4.5.1
shall be proof fired as specified in 3.4.3 at each of the
following temperatures: +125F and -50F.
3.4.5 Hydraulic leakage.
3.4.5.1 Dynamic.  Immediately following cycling of the gun
mount there shall be no more than one milliliter (ml) of oil
accumulation per every five (5) cycles tested at any seal
interface location.  Immediately following this determination all
oil accumulations are to be wiped clean prior to an additional
five (5) cycle incremented test.
3.4.5.2 Static.  After the gun mount has set statically for
24 hours after completion of each test, (mechanical
gymnastication, functional firing, proof firing) there shall be no
more than 1 ml of oil accumulation at any seal interface location
and no evidence of seepage of hydraulic fluid from any of the
hydraulic tubes, manifolds, hose connections, and fill/bleeder
valves.
3.4.6 Nitrogen leakage.  Mounts shall also be examined for
leakage of nitrogen.  Any indications of foamy or emulsified
condition of reserve oil indicates gas leakage and shall be cause
for rejection.
3.4.7 Correlation of data.  The data recorded for 3.4.2,
functional firing, and for 3.4.3, proof firing, shall be
correlated.  If the correlation between length of recoil and cycle
time is not satisfactory, as determined by the procuring agency,
the mounts shall be returned to the contractor.
3.5 Protective finishes.
3.5.1 Inorqanic.  Inorganic finishes, including metal
deposited coatings and surface treatments, shall be as Specified
on the drawings.
3.5.2 Paintinq.
Painting shall be as specified on the
drawings.
3.6 Markinq.  Identification marking, including application
of part numbers, and instruction marking shall be as specified on
the drawings and in MIL-STD-130.
3.7  Data requirements.  The contractor shall generate data in
accordance with the requirements of the data item description
cited in 4.6.5.
3.8 Workmanship.  Each mount shall be free of defects that
affect overall appearance, serviceability, or performance such as
burrs, fins, sharp edges, and surface flaws or blemishes.
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