MIL-PRF-14107D
"fire", and the entire 50 rounds fired with one pull of the trigger,
recording the cyclic rate of fire. Reload the weapon as above and
condition at -70o + 5oF (-56.6o + 2oC) for an additional 3 hours. Fire
the entire 50 rounds and again record the cyclic rate of fire.
Stoppages of the gun attributable to the oil, or a reduction in the
rate of fire of more than 75 rounds per minute under the original
rate, shall constitute performance failure. The weapon shall not show
evidence of abnormal wear.
4.3.2.10 Physical appearance. Pour the oil into a clear glass
container and note the appearance. The oil shall show no evidence of
sediment or suspended matter when examined visually.
4.3.3 Environmental requirements verification.
4.3.3.1 Corrosion protection. Corrosion protection testing shall be
in accordance with FED-STD-791, Method 5329. After testing, a total
of no more than three corrosion dots, none of which exceeds one
millimeter in length, width, or diameter, shall be evident on the
test panels. Corrosion on the outer .25 inch (6 mm) of the panels
shall not be cause for rejection.
4.3.3.2 Oxidation stability.
4.3.3.2.1 Preparation of test specimens. Use two metal specimens for
this test, each approximately 1.75 in. (4.45 cm) by 0.375 in. (0.95
cm) by 0.025 in. (0.06 cm). Make one specimen from copper conforming
to ASTM B152 and one specimen from steel conforming to FS 1009, QQ-S-
698. Polish the specimen to remove all pits, burrs and irregularities
from the faces and edges. Initial polishing may be done with the aid
of a slow-speed horizontal metallurgical polishing wheel. Final
polishing may be done with 240 grit silicon carbide or aluminum oxide
abrasive having cloth or paper backing. Moisten the cloth or paper
bonded abrasive with solvent conforming to P-D-680. After polishing,
spray the specimens with naphtha conforming to TT-N-95 followed by a
rinse in hot naphtha and hot methanol conforming to O-M-232. Do not
touch the specimens with the hands after they have been polished and
cleaned.
4.3.3.2.2 Test procedure. Weigh the metal specimens. Weigh 150 + 5
grams of the lubricating oil into a Pyrex test tube approximately 500
mm long by 50 mm O.D. fitted with an air inlet tube and reflux
condenser. Connect the copper and steel specimens with a copper wire
and support them with a glass holder equipped with glass hooks.
Arrange the specimens so that they will not touch each other during
the test. Immerse the specimens in the oil so that they are
completely covered. Place the tube and condenser assembly in a bath
maintained at 212o + 1oF (100o + 0.5oC). By means of a glass tube, pass
air which has previously passed through two towers, one containing
soda lime and the second containing glass wool, through the oil at a
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