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|  MIL-C-70724(AR)
APPENDIX D
e. The first microphone shall be placed in such a
location in the firing room that the noise level produced by a
burst of control cartridges is within the range specified in the
requirement. This may entail firing more than one burst of
control ammunition, with the microphone being moved to a new
position for each burst fired, until the results comply with the
requirement. When firing the test cartridges it is imperative
that the microphone remain in the exact position as was used to
obtain the specified level for the control cartridges.
The following procedure shall be
During firing.
50.2
followed:
a.
An observer is stationed at the noise level meter.
b. The magazine containing the control cartridges shall
be inserted into the weapon and fired full automatic.
The noise levels are recorded.
c.
d. Without moving the microphones, a BFA shall be
attached to the weapon. The magazines containing the test
cartridges shall be-loaded into-the weapon and fired.
NOTE THAT SPECIAL ATTENTION IS REQUIRED SO THAT CARTRIDGES
WITH BULLETS ARE NOT FIRED IN A WEAPON WITH A BFA ON IT. DOING SO
MAY BE HAZARDOUS AND MAY CAUSE WEAPON DAMAGE.
e.
The noise levels are recorded.
If the noise level at the right handed gunner's head
f.
position exceeds 135 decibels, the test shall be repeated with the
microphone located at the left handed gunner's head position.
g. Fired cases shall be visually examined by the
technician for possible case casualties.
60.0
RECORDING OF DATA
Record the following:
Data.
60.1
Date of test
Test ammunition lot number and specification number
Ammunition temperature
Gun room temperature
Firing range temperature
e.
outdoor temperature
f.
Gun type and serial number
g.
Number of times the barrel has been fired
h.
Gun headspace
i.
D-2
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