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|  MIL-C-45975B(AR)
(Application for copies should be addressed to the American Society for Testing
and Materials, 1916 Race Street, Philadelphia, Pennsylvania 19103.)
(Nongovernment standards and other publications are normally available from the
organizations which prepare or which distribute the documents. These documents
also may be available in or through libraries or other informational services.)
2.3 Order of precedence. The applicable contract contains an order of
precedence clause wherein the specifications are listed last. With respect to
this specification, the order of precedence is drawing requirements, followed by
the text of this specification, Quality Assurance Provisions (QAPs), then the
referenced specifications and standards. Nothing in this specification shall
supersede applicable laws and regulations unless a specific exemption has been
obtained.
3.
REQUIREMENTS
3.1 General requirements. Cannon and component parts shall be in accordance with
the applicable contract, the applicable drawings, Engineering Parts List 11578880,
the requirements of this specification, the provisions of MIL_C_13931, and all
referenced documents. Any conflicts are to be resolved by means of the order of
precedence (see 2.3).
3.2 First article. The contractor shall submit a first article unless it is
specifically waived in the contract (see 4.4 and 6.2). NO first article
requirements shall be waived without review and approval by the Procuring
Contracting Officer (see 6.4).
3.3 Reliability, Availability, Maintainability and Durability (RAM-D). The
RAM-D (see 50.1 - Appendix B) requirements of the M198 Howitzer system for the
Operational Mode Summary/Mission Profile (OMS-MP) are stated in MIL-H-45984.
Since the availability arid maintainability requirements are specified for the M198
Howitzer system only, these attributes cannot be apportioned for the cannon; but,
the reliability and durability requirements are specified for the cannon in
Appendix B (see 30).
3.4 Functional characteristics. The cannon shall perform the firing, pressure
sustaining, and projectile launching functions of the 155MM M198 Towed Howitzer
System. The breech mechanism, firing mechanism and thermal warning device shall
function smoothly without interference, erratic movement or malfunction.
3.4.1 Breech mechanism. To open the breech, a clockwise movement of the lower mechanism.
handle shall unlatch the release lever. Continued clockwise rotation of the
breechblock assembly to the point where the upper handle caroming surface contacts
the breech ring cam shall disengage the sectored threads. At this point, the
block lock shall engage the cam plate slot to prevent any rotation of the
breechblock while it is free to swing.
The disengaged breechblock assembly shall swing about the carrier hinge pin
which is located at 45 from the vertical centerline. The opening swing shall be
controlled by a rearward force on the handles assisted by gravity. The swing
shall be limited by contact between the carrier stop surface and the breech ring.
3
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