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Appendix B Reliability, Availability, Maintainability, Durability Requirements and Reliability Scoring Criteria for Cannon, 1... |
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|  MIL-C-45975B(AR)
APPENDIX B
RELIABILITY, AVAILABILITY, MAINTAINABILITY, DURABILITY REQUIREMENTS
AND RELIABILITY SCORING CRITERIA FOR CANNON, 155MM: M199
10.
SCOPE
10.1 Scope. This Appendix details all requirements and inspetion methods
necessary for Reliability, Availability, Maintainability and Durability. This
Appendix B also provides Reliability assessors guidelines for the consistent
classification of failure for assessing the Reliability requirements of the
Cannon, 155MM: M199. This Appendix B is a mandatory part of the specifciation.
The information contained herein is intended for compliance.
20. APPLICABLE DOCUMENTS
STANDARDS
MILITARY
MIL-STD-721 - Definitions of Effectiveness Terms for Reliablitity,
Maintainability, Human Factors, and Safety
MIL-STD-882 - System Safety Program Requirements
30.
REQUIREMENTS
30.1 Reliability. The cannon as a component of a fully operational Howitzer,
155MM: M198 Howitzer system, shall have for the Operational Mode Summary/Mission
Profile (OMS/MP) (see 3.3) a minimum acceptable value (MAV) of 2,100 Equivalent
Full Charge (EFC) mean rounds between failure (MRBF) with 80 percent confidence
(see 40.2). The scoring criteria for assessing the reliability requirements new
stated in 40.6.
30.1.1 Mission profile. A typical 48 hour mission consists of firing 250 mixed
charge rounds which are equivalent to 100 EFC rounds.
30.2 Maintainability. The cannon parts and components shall have the following
maintainabilities:
a. Tube: Cleaning and Lubricatin the tube after firing, in accordance with
applicable maintenance procedures, to prevent corrosion shall be the only
maintenance required.
b. Breech: Service of the breech shall be carried out by the crew and shall
be limited to minor maintenance and cleanup. Disassembly, cleaning and
reassembly of the breechlock, firing mechanism block assembly, and
associated operating linkage shall be carried out by the crew within 1.5
man-hours. Repair shall be carried out at unit (company or battalion)
level.
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