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MIL-C-70725A (AR)
4.6.21 Sand and dust.  The procedures outlined in TOP 3-2-
045, type A, shall be followed.  The sand and dust mixture in the
TOP shall be used with the sand and dust feeder calibrated to
dispense the mixture at a rate of 100 25 grams per minute per
square meter over the area concerned.  One lubricated M16A1 and
one M16A2, shall be placed in a mount inside the dust chamber,
along with the required ammunition.  The dust dispenser shall be
turned on and allowed to operate for one minute before firing.
The function and casualty firing schedule for 500 rounds shall be
followed for each weapon. The cyclic rate measurements shall not
be recorded, they are not required in this test.  All fired cases
shall be inspected for defects.  The criteria shall be considered
met if there are no critical defects in accordance with Table IV.
4.6.22 Corrosion.  The sample shall be subjected to the
salt-fog test outlined in method 509 of MIL-STD-810.  After 48
hours of exposure to the 5 percent mixture, the sample shall be
examined and its condition documented.  It shall then be loaded
into magazines.  The rounds shall then be chambered and fired in
the specified weapons.  Failure of the rounds to safely function
(critical defects in accordance with Table IV) shall be cause for
rejection.
4.6.23 Temperature/humidity cycling.  The temperature/-
humidity cycling test shall be conducted as follows:
a.  One half of the sample shall be subjected to the
schedule below for a period of four days.
Relative Humidity
(Percent)
Temperature
Hours
90
and
40.6
2
increase
to
90
and
40.6
16
maintain
at
95
and
21.1
2
decrease
to
95
21.1
and
4
maintain
at
b.  Following the conditioning period, the conditioned
cartridges shall be fired in accordance with the function and
casualty firing schedule for 500 rounds with the cyclic rates
recorded as indicated.  The same shall be repeated with the
unconditioned cartridges in the exact same weapon.
41

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