1、 Comments, suggestions, or questions on this document should be addressed to U.S. Army RDECOM, Tank Automotive Research, Development and Engineering Center, ATTN: RDTA-EN/STND/TRANS MS #268, 6501 E. 11 Mile Road, Warren, MI 48397-5000 or emailed to DAMI_STANDARDIZATIONconus.army.mil. Since contact i
2、nformation can change, you may want to verify the currency of this address information using the ASSIST Online database at https:/assist.daps.dla.mil. AMSC N/A FSC 1015 INCH-POUND MIL-PRF-71229D (AT) 6 January 2011 SUPERSEDING MIL-PRF-71229C (AT) 23 August 2001 PERFORMANCE SPECIFICATION MOUNT, GUN,
3、120MM This specification is approved for use by the U.S. Army Tank Automotive Research, Development and Engineering Center (TARDEC), Research, Development and Engineering Command (RDECOM), Department of the Army, and is available for use by all Departments and Agencies of the Department of Defense.
4、1. SCOPE 1.1 Scope. This gun mount is used with the 120MM Gun Cannon, M256, and in the Abrams Series Tanks. 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3, 4, or 5 of this specification. This section does not include documents cited in other sec
5、tions of this specification or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements of documents cited in sections 3, 4, or 5 of this specification,
6、 whether or not they are listed. 2.2 Government documents. 2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in
7、the solicitation or contract (see 6.2). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-71229D 2 COMMERCIAL ITEM DESCRIPTIONS A-A-52624 - Antifreeze, Multi Engine Type DEPARTMENT OF DEFENSE SPECIFICATIONS DoD-C-70429 - Cannon, 120MM Gun: M256
8、 (Copies of these documents are available online at https:/assist.daps.dla.mil/quicksearch/ or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) 2.3 Non-Government publications. The following documents form a part of this document to the ext
9、ent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract (see 6.2). AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI) ANSI/(NFPA) T2.13.7 - Hydraulic Fluid Power - Petroleum Fluids - Prediction of Bulk Moduli (Copies of these document
10、s are available from www.ansi.org or ANSI Customer Service Department, 25 W. 43rd Street, 4th Floor, New York, NY 10036.) ASTM INTERNATIONAL ASTM D1655 - Standard Specification for Aviation Turbine Fuels (DoD Adopted) ASTM D4175 - Standard Terminology Relating to Petroleum, Petroleum Products, and L
11、ubricants (DoD Adopted) ASTM G21 - Standard Practice for Determining Resistance of Synthetic Polymeric Materials to Fungi (DoD Adopted) (Copies of these documents are available from www.astm.org or ASTM International, P.O. Box C700, West Conshohocken, PA 19428-2959.) SAE INTERNATIONAL SAE AMS 3054 -
12、 Oil, Lubricating, Low Temperature for -55 C (-67 F) Service (DoD Adopted) SAE J300 - Engine Oil Viscosity Classification (DoD Adopted) SAE J312 - Automotive Gasolines SAE J313 - Diesel Fuels SAE J1447 - Fire-Resistant Fluid Usage in Hydraulic Systems of Off-Road Work Machines Provided by IHSNot for
13、 ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-71229D 3 (Copies of these documents are available from www.sae.org or SAE Customer Service, 400 Commonwealth Drive, Warrendale, PA 15096-0001.) 2.4 Order of precedence. Unless otherwise noted herein or in the contrac
14、t, in the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 First article.
15、 When specified (see 6.2), a sample shall be subjected to first article inspection in accordance with 4.3. 3.2 Design, materials, and manufacturing processes. The design, materials, and manufacturing processes shall be in accordance with the manufacturers standard practice as long as all articles su
16、bmitted to the Government fully meet the operating, interface, support and ownership, and operating environment requirements specified herein. 3.3 Operating requirements. The gun mount, completely assembled and lubricated, shall operate without chatter, erraticness, or binding in all ranges of eleva
17、tion, depression, and temperatures, without special aids under all operating conditions and as specified herein. 3.3.1 Hydraulic system. The gun mount shall be filled with hydraulic fluid, bled, and refilled until all air and moisture are eliminated. The initial and subsequent filling of the hydraul
18、ic system shall be with hydraulic oil and filtered through a 5-micron filter. Prior to and after mechanical gymnastication (see 3.3.1.1), a 100 ml 5 ml sample volume of oil shall be drawn from the hydraulic system. The sample volume of oil shall be free of all metallic or abrasive particles that may
19、 cause damage to the inner surface of the operating mechanisms. These particles shall not exceed 600 microns in diameter (0.024 in.) except for nonmetallic lint and fibers, where a maximum of 35 particles between 600 and 3000 microns in greatest dimensions are allowed per one sample (see 4.5.1). 3.3
20、.1.1 Mechanical gymnastication. Each gun mount shall be capable of mechanical gymnastication at elevations ranging from 0 to 35 degrees with a tolerance of 2 degrees without evidence of erratic movement (see 4.5.1.1). 3.3.1.2 Hydraulic leakage - mechanical gymnastication. During and immediately foll
21、owing mechanical gymnastication, no more than 15 drops of oil shall accumulate at any location in a three minute period (see 4.5.1.2). 3.3.2 Counter-recoil (CTRR) time. The maximum CTRR time shall be 0.4 seconds at 0 2 degrees elevation, and 2.0 seconds at 35 2 degrees elevation (see 4.5.1.1). Provi
22、ded by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-71229D 4 3.3.3 Proof firing. Each gun mount shall be proof fired (see 6.6.1) or a sample shall be proof fired in accordance with the sampling plan (see 6.2) when simulation testing (see 6.6.2) is in
23、effect (see 4.5.3). 3.3.4 Simulation testing. Simulation testing followed by proof firing according to a sampling plan may be used in lieu of 100 percent (%) proof firing providing the simulator is qualified as specified in 6.3. Simulation testing, providing this election is desired and approved, sh
24、all be conducted on each gun mount according to the simulation test provisions specified in 4.5.4 without evidence of malfunction or failure. 3.3.5 Recoil cycle. When firing (see 6.6.3) at 100% and 113 4% acceptance levels (see 6.6.4), the recoil cycle travel (in inches) and total recoil cycle time
25、(in seconds) at 70 35 degrees Fahrenheit (F) shall be as specified in table I (see 4.5.3.1). TABLE I. Recoil cycle travel and time. Elevation in degrees (2) Recoil cycle travel in inches (min - max) Total recoil cycle time in seconds (max) 0 to 35 0 35 11.25 - 12.25 - - - 0.60 2.50 3.3.6 CTRR veloci
26、ty. At 0.50 inch from the complete in-battery position, the CTRR velocity at 70 35 F shall not exceed the values listed in table II (see 4.5.3.1): TABLE II. CTRR velocity limits. Elevation in degrees (2) Max (ft/sec) 0 3.80 35 3.80 3.3.7 Recoil performance zones. Whether 100% proof firing or 100% si
27、mulation testing with a sample proof fired, the recoil cylinder oil pressure versus time and piston travel versus time curves for each gun mount tested shall be within the applicable recoil performance zones as specified on figures 1 through 4 at 70 35 F (see 4.5.3.1). 3.3.8 Hydraulic leakage. Durin
28、g and immediately following each sequence of firing cycles for each gun mount, there shall be no more than 15 drops of oil accumulation at any location in a three minute period. After the gun mount sets statically for four hours and all joints are wiped clean, there shall be no more than three drops
29、 of oil accumulation at any location within a five minute period (see 4.5.3.2 and 4.5.4.1). 3.3.9 Camouflage. All externally visible parts shall be field camouflaged through dark color, such as black, olive drab, brown etc. selection and reflectance (see 4.5.5). Provided by IHSNot for ResaleNo repro
30、duction or networking permitted without license from IHS-,-,-MIL-PRF-71229D 5 3.3.10 Weapon functioning. Either recoil or counter-recoil modes shall not show any indications of erratic operation. Any indication shall be cause for rejection (see 4.5.3.1). 3.4 Interface requirements. The gun mount sha
31、ll accommodate the following inputs and interfaces. 3.4.1 M256 interface. The gun mount shall interface with the 120MM Gun Cannon, M256, as specified in DoD-C-70429 (see 4.6.1). The interface shall be as specified in the contract or order (see 6.2). 3.4.2 Case ejection. During counter-recoil action,
32、 the breech operating cam shall operate in conjunction with the breech mechanism to produce ejection of empty cases clear of the cannon and latch breech block in open position at all operational temperatures, except at extreme cold temperatures (-31 F to -50 F). When simulation testing, the velocity
33、 of counter-recoil at 3.0 0.25 inches from the complete in-battery position shall be as listed in table III (in order to satisfy the case ejection requirement) (see 4.6.2 and 4.6.3): TABLE III. Counter-recoil velocity limits. Elevation in degrees (2) Min - max (ft/sec) 0 4.00 - 6.25 35 2.60 - 5.90 3
34、.5 Support and ownership requirements. Each gun mount shall possess the following support and ownership characteristics. 3.5.1 Gun mount static pressure. Each gun mount shall withstand a sustained hydraulic static pressure of 3500 200 pounds per square inch (psi) for not less than 5 minutes without
35、any leakage. NOTE: Extreme caution must be exercised during pressurization of gun mounts (see 4.7.1). 3.5.2 Identification. Unless otherwise specified (see 6.2), each gun mount shall have a primary permanent serial number identifier placed as an integral part of the cradle near the breech (see 4.7.2
36、). 3.6 Operating environmental requirements. Each gun mount shall operate under the following environmental conditions without damage or loss of performance. 3.6.1 Climatic conditions. Gun mounts shall be fully operational between the temperature range of -50 F and +125 F without evidence of malfunc
37、tion or failure (see 4.3.1.1). 3.6.1.1 Recoil cycle time. The recoil cycle time under climatic conditions at 100% and 113 +4% impulse levels between 0 degrees and 35 degrees elevation shall be as listed in table IV (see 4.3.1.1): Provided by IHSNot for ResaleNo reproduction or networking permitted w
38、ithout license from IHS-,-,-MIL-PRF-71229D 6 TABLE IV. Recoil cycle time. Temperature (5 F) Elevation in degrees (2) Max cycle time (sec) -50 0 lubricate-grade bis(2-ethylhexl)sebacate, 89 1.0%; diisopropyl phosphate, 1.0 0.2%; 2,6 di-tertary butyl-p-crsol, 0.5 0.1%; oil-free barium dinonylnaphthale
39、ne sulfonate, 1.5 0.3%. 2/ Chemical agent decontaminate, DS2, consists of the following materials in the proportions by weight indicated: Diethylenetriamine, 69-71%; sodium hydroxide (ACS grade except the sodium carbonate content is no greater than 0.5% by weight), 1.9-2.1%; and ethylene glycol mono
40、methyl ether, the remaining weight. 3/ Chemical agent decontaminate, STB, consists of the following materials in the proportions by weight indicated: calcium oxide, 6.6 0.1%; and bleaching powder (chlorinated lime) having a maximum moisture content of 1.0% by weight (Do not substitute calcium hypoch
41、lorite for the bleaching powder), the remaining weight. 4.8.4 Altitude simulation. A gun mount shall be subjected to a pressure of 10 psi absolute for a minimum of one hour. Three rounds shall then be proof fired at the simulated altitude without malfunction (see 3.6.5). 4.8.5 Fungus resistance veri
42、fication. The fungus resistance requirement shall be satisfied by one of the two methods as specified in 4.8.5.1 and 4.8.5.2 (see 3.6.6). 4.8.5.1 Fungus resistance demonstration. Fungus resistance shall be determined in accordance with ASTM G21. 4.8.5.2 Fungus resistance materials analysis. The gun
43、mount shall be verified by analysis or evaluation to contain only fungus inert materials or treated materials to make fungus inert or resistant. 5. PACKAGING 5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the contract or order (see 6.2). When packaging o
44、f materiel is to be performed by Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-71229D 14 DoD or in-house contractor personnel, these personnel need to contact the responsible packaging activity to ascertain packaging requirements. Packaging
45、 requirements are maintained by the Inventory Control Points packaging activities within the Military Service or Defense Agency, or within the military services system commands. Packaging data retrieval is available from the managing Military Departments or Defense Agencys automated packaging files,
46、 CD-ROM products, or by contacting the responsible packaging activity. 6. NOTES (This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.) 6.1 Intended use. This hydrospring gun mount is military unique because it is specially designed to interf
47、ace with the 120MM: M256 Tank Gun in the Abrams Series Tanks. 6.2 Acquisition requirements. Acquisition documents should specify the following: a. Title, number, and date of this specification. b. If required, the specific issue of individual documents referenced (see 2.2.1 and 2.3). c. Any addition
48、al or extended examinations and tests beyond the scope of this specification. d. When first article is required (see 3.1). e. If sample is proof fired in accordance with the sampling plan (see 3.3.3). f. Requirements for the M256 interface (see 3.4.1). g. Serial numbers for the gun mounts (see 3.5.2
49、). h. If alternative test methods may be used (see 4.2.1). i. If first article inspection should be other than as specified (see 4.3). j. If different first article proof firing measurements and/or meet requirements (see 4.3.1). k. If different first article proof firing in climatic conditions (see 3.6.1 and 4.3.1.1). l. If there are different examinations and tests from c
