1、MIL-C-45978A LO 9999906 0502238 O = INCH-POUND 1 MIL-C-4 5978A (AR) 12 February 1992 SUPERSEDING MIL-C-45978 (AR) 3 SEPTEMBER 1986 MILITARY SPECIFICATION CANNON, 105MM HOWITZER: M205 This specification is approved for use by the Department of the Army and is available for use by all Departments and
2、Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification supports the acquisition of the Cannon, 105MM HOWITZER: M205 consisting of the tube and the breech mechanism assembly. This specification includes the minimum essential Engineering and Packaging Requirements and the necess
3、ary Quality Assurance Provisions to determine that these requirements have been met. 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specification, standards, and handbooks. The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Un
4、less otherwise specified, the issues of these documents are those listed in the issue of the Department of Defense Index of Specifications and Standards (DODISS) and supplement thereto, cited in the solicitation (see 6.2). - Beneficial comments (recommendations, additions, deletions) and any pertine
5、nt data which may be of use in improving this document should be addressed to: Commander, Armament Research, Development and Engineering Center, US Army Armament, Munitions and Chemical Command, ATTN: SMCAR-CCB-SC, Watervliet, NY 12189-4050 by using the self-addressed Standardization Document Improv
6、ement Proposal (DD Form 1426) appearing at the end of this document or bv letter. AMSC N/A FSC 1015 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-4597A LO W 999
7、9906 0502219 2 W MIL-C-45978A SPECIFICATIONS MILITARY MIL-C-13931 - Cannon, General Specification for MIL-P-14232 - Parts, Equipment and Tools for Army Materiel, Packaging of Maintenance and Disposition of MIL-1-45607 - Inspection Equipment, Acquisition, MIL-H-63192 - Howitzer, Light, Towed, 105MM:
8、M204 STANDARDS MILITARY MIL-STD-129 - Marking for Shipment and Storage MIL-STD-1190 - Minimum Guidelines for Level C Preservation, Packing and Marking MIL-STD-1235 - Single and Multi-Level Continuous Sampling Procedures and Table for Inspection by Attributes MIL-STD-2073 - DOD Materiel Procedures fo
9、r Development For each of the cycles, the firing plunger shall be activated upon closing the breech to assure that the firing pin operates as required. 4.7.7.3 Test Methods. 4.7.7.3.1 Proof firins test. Proof firing shall be conducted at a Government specified test site. The procedure shall be as fo
10、llows: a. Each cannon or spare tube submitted shall be proof fired b. A facilities mount may be used if necessary. once at 55,000 however, if performance is only degraded, then some threshold must be established to define where reliability failures begin. Allowable degradation thresholds have been e
11、stablished for the various performance parameters. Performance beyond these thresholds constitutes a reliability failure. As long as performance remains above the threshold or is returned above the threshold within a five minute maintenance period, no reliability failure is charged. The allowable de
12、gradation thresholds are: 1. Rate of Fire - maximum 15 RPM (Rounds Per Minute) 2. Rate of Fire - sustained 3-5 RPM (Rounds Per Minute) 50.2 Failure scorins procedure. The following scheme provides the instructions for the use of the Failure Definition (see 60.1.3) for assessing reliability requireme
13、nts of the Cannon, 105MM Howitzer; M205 (see 50-1). These instructions assume that an incident or malfunction has occurred during test, and a record has been prepared against this action to the extent where it is necessary to determine the chargeability of the action. Incidents where the identificat
14、ion of a reliability failure is in doubt will be deferred to a user/developer/tester Scoring Conference. The step-by-step instructions for using the Failure Definition are as follows: Step 1. Record the incident information (i.e. rounds on test item and system, description of incident, nature of mai
15、ntenance action required, maintenance time in hours, maintenance manhours, etc.) when a malfunction of the cannon occurs or is 25 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-4597A LO W 9999906 0502243 T MIL-C-45978A (AR) APPENDIX B detected
16、. Proceed to the next step answering the question posed and taking action according to the answer given. Step 2. Is this a scheduled replacement of parts before failure? If yes, do not charge a failure; if no, proceed to Step 3. Step 3. prescribed operational or maintenance procedures or schedule di
17、ctated by the equipment manuals? failure; if no, proceed to Step 4. Is this a malfunction resulting from not following the If yes, do not charge a Step 4. unrealistic operating conditions or accident? If yes, do not charge a failure: if no, proceed to Step 5. Is this a malfunction resulting from tes
18、t item abuse, Step 5. Is this an actual or incipient malfunction detected or corrected during initial technical inspection or an incipient malfunction detected during final technical inspection? If yes, do not charge a failure; if no, proceed to Step 6. Step 6. Is this an incipient malfunction corre
19、cted during scheduled preventive maintenance gn the part in question, provided a higher level of maintenance is not necessary? If yes, do not charge a failure; if no, proceed to Step 7. Step 7. Is this incident related to or caused by another reliability failure? If yes, do not charge a failure; if
20、no, proceed to Step 8. Step 8. The following statements are addressed collectively. (A) The malfunction did not and would not cause a critical or catastrophic hazard to personnel or equipment as defined by MIL-STD-882. (B) The system performance is above acceptable levels (see 50.1.3). (C) The malfu
21、nction did not and would not preclude the ability to commence or the cessation of any mode of operation.(e.g., load and fire at any range, charge, elevation, or direction) (see 50.1.2). If all three of the above statements are true, do not charge a reliability failure; if any are not true, proceed t
22、o Step 9. Step 9. Is the operator/crew authorized and able to remedy the malfunction by adjustment, repair, or replacement action within five minutes, using the controls, Basic Issue Items (BII), Items Troop Installed or Authorized (ITIA) and parts authorized to the crew? If the answer is yes, do no
23、t charge a reliability failure; if no, proceed to Step 10. 26 c c Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-VS778A LO 7777706 050224V I I Step 10. If the previous 9 steps provide inconclusive evidence as to the chargeability or non-charge
24、ability of a reliability failure, the incident should be checked against the criteria of 50.1. defer classification to a user/developer/tester Scoring Conference. If categorization of the incident remains in doubt, 60. RAM-D DEFINITIONS. 60.1 Reliability, Availability, Maintainability, and Durabilit
25、y (RAM-D) terms and definitions. Reliability, maintainability and durability terms and definitions used in this specification are in accordance with MIL-STD-721 and 60.1.1. 60.1.1 Durability. Durability is the probability that an item will successfully survive its projected life, overhaul point, or
26、rebuild point (whichever is the more appropriate durability measure for the item) without a durability failure. 60.1.2 Durability failure. A durability failure is considered to be a malfunction that precludes further operation of the item and is great enough in terms of cost, safety, or time to rest
27、ore that the item must be replaced or rebuilt. 60.1.3 Failure. For the purpose of assessing reliability, a failure is a malfunction that the operator or crew cannot or is not authorized to remedy by adjustment, repair, or replacement action within five minutes, using the controls, Basic Issue Items
28、(BII), Items Troop Installed or Authorized (ITIA) and parts authorized to the crew, which causes or would cause: a. inability to commence or the cessation of any mode of- operation. b. a critical or catastrophic hazard to personnel. or equipment as defined by MIL-STD-882. the primary malfunction will be counted against reliability (see 50.1.1). For related malfunctions only 27 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
