 |
|||
|
|
|||
| ||||||||||
|
|  MIL-C-45975B(AR)
APPENDIX B
40.3.1 Tube. Durability shall be demonstrated by measureing wear after every 250
rounds until 0.100 inch wear has occurred at 41.75 inches from the rear face of
the tube, or until 0.060 inch wear has occurred at 60 inches from the rear face of
the tube. The firing rate shall not exceed one round every two minutes and shall
be such that the thermal warning device does not exceed 250F. If the preceding
wear occurs in either or both tubes before 1750 rounds has been reached, paragraph
40.5 applies.
40.3.2 Muzzle brake. After firing 1750 rounds on each cannon, the muzzle brake
shall be magnetic particle inspected in accordance with applicable drawings and
specifications.
40.3.3 Breech mechanism. Durability shall be demonstrated by dynamic presure
cycling the breech mechanism at Watervliet Arsenal or other approved facility, a
total of 15,000 EFC pressure cycles. Ronnds fired in other tests of 40.1 and
40.2 shall be counted as cycles for this test.
40.4 Failure analysis. The contractor shall conduct a failure analysis by
performing a dimensional, physical and visual examination of the 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 or physical properties or
both, the contractor shall accomplish, as applicable, the following action:
a.
Evaluate and correct the applicable production processes and procedures to
prevent recurrence of the same defect in future production.
b.
Examine completely assembled cannon and partially assembled cannon and
components to ensure that material containing the same defect is purged
from the inventory and not presented to the Government for acceptance.
c. Submit the results of the failure analysis and the corrective actions
taken to the Government for evaluation and approval of retest or
continuation of test.
40.5 Tube Wear Data. If tube requirements are not met, (see 40.3.1) the results
shall analyzed in accordance with currently available wear data for the M199
tube and a determination made as to whether the results indicate performance
substantially below expected levels. If it is determined the results so indicate,
then the following procedures shall apply:
a. Conduct a failure analysis study performing a dimensional, visual and
metallurgical examination of the tube.
b.
Review the ammunition elements (propellant, charge, and projectile
characteristics) for abnormalities or changes in design or configuration
since last tested.
c.
Evaluate applicable production processes and procedures and correct as
warranted.
19
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals