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|  MIL-C-45978A(AR)
APPENDIX B
b.
Rate of fire shall not exceed 3-5 rounds per minute.
*
Borescope and measure tube
ID at
the beginning of each
sequence.
** Magnetic particle inspect, borescope, and measure tube at at
the end of each sequence.
40.1.2.3 cannon durability test method. The durability test
shall be conducted on two cannon, essentially by hydraulic
pressure cycling at the applicable service chamber pressure(s) of
the cannon tube (54,0CM3 + 1,500 psi) and breech mechanism (breech
t
ring and breechblock) (54,000 + 1,500 psi). Rounds fired
,
other tests of Appendices A and B may be counted as cycles for
the durability tests.
I
40.1.2.3.1 Tube durability test method. The two tubes shall be
conditioned by initial firing of 250 rounds from each tube.
Durability shall be demonstrated by hydraulically pressurizing
the two tubes at Watervliet Arsenal or other Government approved
facility. Each tube shall be cycled to destruction at pressures
conforming to the pressure travel curve for service ammunition.
The fatigue life shall be consistent with the requirement of
30.3.l.a based on a log normal failure distribution. If the
requirement is not satisfied, 40.2 applies.
40.1.2.3.2 Breech mechanism durability test method. Durability
shall be demonstrated by hydrodynamic impact testing two breech
mechanisms (breech ring and breechblock) at Watervliet Arsenal or
other Government approved facility. Each breech mechanism shall
be cycled to destruction at 43,7oo + 1,500 psi. The fatigue life
shall be consistent with the requirement of 30.3.l.b based on a
log normal failure distribution. If the requirement is not
satisfied, 40.2 of Appendix B applies.
40.2 Failure analysis
The contractor shall assist the
Government in the failure analysis procedure by performing a
dimensional, physical and visual examination of the FA-IPT
components which are suspected to have caused the failure.
Results shall be submitted to the Government for a failure cause
determination.
If it is determined that failure occurred because
of deviation from specified dimensions, physical properties, or
both, the contractor shall accomplish, as applicable, the
following actions:
a.
Evaluate and correct the applicable production processes
and procedures to prevent recurrence of the same defects in
future production.
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