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|  MIL-M-45945A
incurring more than three immediately clearable malfunctions and
the cyclic rate of fire shall be within the limits specified in
3.4.5. No unserviceable parts, or uncontrolled fire-are allowed.
No malfunctions which require disassembly of the machine gun or
in excess of one minute to correct are allowed. Malfunctions not
attributable to the machine gun, as substantiated by the contractor
failure analysis and acceptable to the Government, shall be
reported and shall not be chargeable. A malfunction is defined
as any unplanned cessation of firing or the inability to commence
firing. Testing shall be as specified in 4.4.3.5.
3.4.9 Reliability. The machine gun shall demonstrate a Mean
Round Between Stoppage (MRBS) of 1538 rounds and a Mean Round
Between Failure (MRBF) of 4444 rounds over a minimum receiver
service life of 50,000 rounds. Barrel life shall be 15,000
round minimumTesting shall be in accordance with 4.4.3.6.
3.4.9.1 Mean round between stoppage. MRBS is determind by
dividing the total number of rounds fired by the total number of
stoppages. A stoppage is defined as any unplanned cessation in
firing or the inability to commence or cease firing attributable
to the gun. All incidents shall be recorded and any considered
as' not chargeable to the machine gun shall be substantiated by
the contractor.
3.4.9.2 Mean round between failure. MRBF is determined by
dividing the total number of rounds fired by the total number of
failures. A failure is defined as any stoppage (as described in
3.4.9.1) which involves part replacement or requires in excess of
one minute correct; or involves any unserviceable part
detected during scheduled preventive maintenance, the replacement
of which is not authorized at the crew or organizational level of
maintenance as prescribed by Source Maintenance Recoverability
Code and TM-9-1005-224-24P. (NOTE: MRBF is a subset of MRBS).
Only parts determined unserviceable may be replaced.
Simultaneous replacement of unserviceable parts is treated as one
changeable failure.Incidents attributable to personnel, test
equipment, or unserviceable parts found at the conclusion of
testing are not chargeable. However, all parts replacement,
whether chargeable or not shall be recorded.
3.4.9.3 Unserviceable barrel. A barrel is considered
unserviceable when:a) 20 percent of any burst exhibits yaw of
15 degrees or more or, b) a mean velocity of a burst drops 200
feet per second below the mean of the velocity initially recorded
at the start of the test. Barrels failing to-meet the minimum
life criteria shall be considered failures for the MRBS/MRBF
computations. Testing for barrel life shall be in accordance
with 4.4.3.6.
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