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|  MIL-M-45013E (AR)
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 to correct; or involve any unserviceable part detected
during scheduled preventive maintenance, the replacement of which
is not authorized at the crew or organizational level of main-
tenance 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 Unservidable 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.
3.5 Marking. Marking shall be in accordance with the
applicable drawings and MIL-W-13855. The bar code label shall be
firmly affixed to the weapon receiver. The bar coding shall be
clearly defined on the label and shall agree with the serial
number stamped on the receiver.
3.6 Workmenship. Workmanship shall be in accordance with
the workmanship requirements of MIL-W-63150. Inspection shall be
as specified in 4.4.2.
4.
QUALITY ASSURANCE PROVISIONS
4.1 REsponsibility for inspection. Unless otherwise
specified in the contract or purchase order, the contractor is
responsible for the performance of all inspection requirements
(examinations and tests) as specified herein. Except as
otherwise specified in the contract or purchase order, the
contractor may use his own or any other facilities suitable for
the performance of the inspection requirements specified herein,
unless disapproved by the Government. The Government reserves
the right to perform any of the inspections set forth in this
specification where such inspections are deemed necessary to
ensure supplies and services conform to prescribed requirements.
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