Click here to make tpub.com your Home Page

Page Title: Mean round between failure.
Back | Up | Next

Click here for thousands of PDF manuals

Google


Web
www.tpub.com

Home

   
Information Categories
.... Administration
Advancement
Aerographer
Automotive
Aviation
Construction
Diving
Draftsman
Engineering
Electronics
Food and Cooking
Logistics
Math
Medical
Music
Nuclear Fundamentals
Photography
Religion
   
   

 




img
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.
13

Privacy Statement - Press Release - Copyright Information. - Contact Us