1、MIL-G-71047 = 0b 185b89b 520 MIL-G-71047 (AR) 13 April 1993 MILITARY SPECIFICATION MACHINE, GUN, CALIBER .50, AIRCRAFT, XM296 This specification is approved for use by the U.S. Army Armament, Munitions and Chemical Command, and is available for use by all Departments and Agencies of the Department o
2、f Defense. 1. SCOPE 1.1 Scope. This specification covers the requirements, examinations and tests for an automatic, recoil operated, air- cooled, caliber .SO machine gun (see 6.1). 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications, standards, and handbooks. The following specifi
3、cations, standards, and handbooks form a part of this document to the extent saecified herein. Unless otherwise specified, the issues of these documents are those listed in the Stanrds (DODISS) and supplement thereto, cited in the solicitation (see 6.2). - issue of the Department of Defense Index of
4、 Specifications and Beneficial comments (recommendations, additions, deletions) ano any pertinent data which may be of use in improving this document, should be addressed to: Commander, U.S. Army ARDEC, ATTN: SMCAR-BAC-S, Picatinny Arsenal, New Jersey 07806-5000 by using the self-addressed Standardi
5、zation Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. AMSC N/A FSC 1005 DISTRIBUTION STATEMENT A. Approved .for public reiease; distribution is unlimited. O Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS
6、-,-,-MIL-G-71047 W 99999Ob 1856897 Vb7 SPECIFICATIONS MIL I TARY MIL-W-13855 MIL-F-14232 MIL-1-45607 MIL-W-63150 STANDARDS MILITARY MIL-STD-109 MIL-STD-130 MIL-STD-1949 MIL-G-71047 (AR) - Weapons: Small Arms and Aircraft Armament Subsystems, General Specification for - Parts, Equipment and Tools for
7、 Army Materiel, Packaging and Packing of - Inspection Equipment, Acquisition, Maintenance and Disposition of - Weapons and Support Material, Standard Quality Assurance Provisions for - Quality Assurance Terms and Definitions - Identification Marking of US Military - Inspection, Magnetic Particle Pro
8、perty (Unless otherwise indicated, copies of federal and military specifications, standards, and handbooks are available from the Standardization Documents Order Desk, Bldg. 4D, 700 Robbins Avenue, Philadelphia, PA 19111-5094.) 2.1.2 Other Government documents, drawinqs, 2nd publications. The follow
9、ing other Government documents, drawings, and publicatiox form a part of this document to the extent specified herein. Unless otherwise specified, the issues are those cited in the solicitation. DiIASiINGS (see 6.4) c. S. ARMY ARMAMENT RESEARCH, DEVELOPMENT AND ENGINEERING CENTER (ARDCC) PRODUCT AND
10、 PACKAGING DRAWINGS 12949648 - Machine Gun, Cal. 50, XM296 PS 12949648 - Packaging Data Sheet, Machine Gun, Cal .50, XM296 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-G-71047 = 9999906 L85b898 3T3 MIL-G-71047 (AR) INSPECTION EQUIPMENT DRAWING
11、S 5520627 - 6047008 - 7270150 or 6 5 11 O 5 3 8440920 - 8440929 - 11838715 - 12003958 or 5351211 - 12003959 or 5351213 and 5351214 - 12011845 - - Copper Compression Cylinder Holding Fixture Indicator Gage Assembly Weighing Gage Cylinder, Pressure Gage Fixture, Function Firing Boresight Kit Gage , He
12、adspace Gage, Timing Diagram, Targeting and Accuracy PUBLICATIONS TECHNICAL MANUAL TM 9-1090-214-23T - Armament Subsystem Helicopter, XM149, .50 Caliber Machine Gun XM296 (12.7mm) 2.75 Inch (70m) Rocket System with Missile System integration (Copies of other Government documents, drawings, and publi
13、cations required by contractors in connection with specific acquisition functions should be obtained from the contracting activity or as directed by the contracting activity.) 2.2 Order of precedence. In the event of a conflict between the text of this document and the references cited herein, the t
14、ext 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. When specified in the contract or purchase order (see 6.21, a sample shall be subjected to first arti
15、cle inspection in accordance with the technical provisions herein (see 4.3). Unless otherwise specified (see 6.21, the first article shall include the Pilot Pack (ses 5.1). 3.2 Materials, construction and desiqn. The machine gun components and assemblies shall conform to the material con- struction
16、and design requirements specified herein, on Drawing 12949648 and the applicSle part and assembly drawings, and in MIL-W-13855. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-G-710q7 D 999990b 1856899 23T MIL-G-71047 (AR) 3.2.1 Sear enqaqement
17、. The cocking lever, when operated by hand, shall retract the firing pin exchange assembly sufficiently to insure engagement of the hook of the extension to the hook of the sear. 3.2.2 Firins pin protrusion. The firing pin protrusion shall not be less than 0.072 inch and not be more than 0.079 inch
18、when measured from the breech face. 3.2.3 Headspace. Each machine gun shall be capable of being adjusted for proper headspace. With the bolt retracted until the barrel extension and the trunnion block are separated approximately 1/16 inch, the distance between the rear face of the barrel and the fac
19、e of the bolt shall not be more than 0.206 inch and not be less than 0.202 inch. NOTE: This adjustment is essential for proper weapon function and must be maintained during all firin5 schedules. 3.2.4 Timina. After having been adjusted for headspace, each machine gun must then be timed. The firing p
20、in shall not release upon actuation of the triggering mechanism when the gap between the barrel extension and the trunnion block exceeds 0.116 inch. However, at some point in the interval when the gap between the barrel extension and the trunnior! block is not more than 0.116 inch and not less than
21、0.020 inch, the firing pin shall release upon actuation of the triggering mechanism. NOTE: This setting must also be maintained during subsequent firing schedules. 3.3 Phvsical characteristics. 3.3.1 Weiuht. The machine gun without any type of flash or blast suppressor attachment on the barrel shall
22、 not weigh more than 65 lbs. 3.3.2 Dimension. The machine gun without any type of flash or blast suppressor attachment on the barrel shcll not exceed 57.00 inches in length, 4.00 inches in width, and 6.75 inches in height. 3.4 Performance characteristics. 3.4.1 Firins pin release. The firing pin sha
23、ll be released by a load not exceeding 38 pounds applied to the sear slide and by a load not exceeding 26 pounds applied to the sear. Testing shall be as specified in 4.5.5. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-G-71047 m 9Ob 1856900
24、Bi81 6 MIL-G-71047 (AR) 3.4.2 Firinq pin indent. The firing pin indent within the range of 0.017 to 0.023 inch and shall not center more than one-half the diameter of the indent. shall be as specified in 4.5.6. O shall be be of Testing 3.4.3 Hiqh pressure resistance. The machine gun shall be capable
25、 of withstanding the firing of one round of Gover.nment standard .50 caliber, M1 high pressure test cartridge. Parts shall be free of cracks, seams or other injurious defects after proof firing. The barrel assembly, barrel extension assembly, bolt subassembly and receiver assembly, of machine guns,
26、after satisfactorily meeting this requirement, shall be proof marked as specified on the appropriate drawings. specified in 4.5.7. 3.4.4 Functioninq. The machine gun shall function without malfunctions attributable to the weapon, and without evidence of unser-Jiceable parts. Testing shall be as spec
27、ified in 4.5.8. 3.4.5 Belt pull. The machine gun shall be capable of functioning while a 20 pound free hanging weight is attached to the ammunition belt. Testing shall be as specified in 4.5.9. Testing shall be as 3.4.6 Cvclic rate of fire. The machine guns shall maintain an average rate of fire of
28、700 to 800 shots per minute. shall be as specified in 4.5.10. aligned with the center of the target of Drawing 12011845, the .center of impact of each 50 round burst shall be within an 8.0 inch diameter circle as shown on the drawing and 80% of the shots shall groyp within or cut the edge of that 8.
29、0 inch diamecer circle at range of 1,000 inches. in 4.5.11. 3.4.8 Endurance. The machine gun shall be capable of firing an endurance schedule of 10,000 rounds of M33 ball cartridges, using M9 links, without substitution of any components and without malfunctions in excess of the limits shown in Tabl
30、e I. Testing shall be as specified in 4.5.12. Testing 3.4.7 Tarqetinq and accuracv. With the boresight reticle Testing shall be as specified 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-G-71047 = Ob L85b901 718 MIL-G-71047 (AR) TABLE I. Malf
31、unctions and unserviceable comDonents (see Notes). /j Malfunctions (attributable to gun) Extruder primer Failure to eject Failure to extract (cartridge case from chamber) Failure to extract (cartridge from feed belt) Failure to feed (bullet striking face of barrel) Failure to feed (insufficient reco
32、il) Hangfire (noticeable) (See 4.5.3.12) Misfire caused by light blow (See 4.5.3.12) Pierced primer Uncontrolled fire All other malfunctions: If correctable by recharging If not correctable by recharging NOTE : Number permitted in the 10,000 round endurance test 1 1 1 1 2 1 O 2 1 O 3 1 When malfunct
33、ions (within the allowances of Table I) are traceable to particular components, it is permissible to replace such comgments and record them as unserviceable, subject to limitations of Table I. When it is definitely established by the inspector that previously recorded malfunctions are attributable t
34、o an unserviceable component, such malfunctions shall not be counted against the machine gun being tested, provided that they occurred not more than 200 rounds prior to replacement of the unserviceable component. However, such malfunctions shall remain recorded and properly identified. Provided by I
35、HSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-G-71047 = 0b LB5b02 654 MIL-G-71047 (AR) TABLE I. Malfunctions and unserviceable components (see Notes). (continued) Unserviceable components Accelerator Back plate Barrel extension Barrel support Belt feed pawl
36、 Belt feed slide Bolt Breech lock cam Cocking lever Cover pin - Driving springs (inner and outer) Ejector Extractor Extractor cam Firing pin Firing pin spring Sear Set back of recoil plate in face of bolt (in excess of .O002 inch) Side, top, or bottom plates (receiver assembly) All other unserviceab
37、le components (different) Number permitted in the 10,000 round endurance tetz O O O O O O O O O O O 1 O O 1 O 1 O O 2 NOTE : No unserviceable components shall be allowed within the first 5,000 rounds. 7. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-
38、,-MIL-G-3L047 999990b b85b903 590 = MIL-G-71047 (AR) 3.4.8.1 Barrel erosion. The barrel assembly shall be capable of firing a 10,000 round endurance schedule without experiencing a muzzle velocity drop of more than 200 feet per second. Testing shall be as specified in 4.5.13. 3.5 Interchanseabilitv.
39、 Unless otherwise specified on the drawings, all parts shall be interchangeable. (In manual assembly operations, there shall be no objections to preferential assembly of part provided that all parts are dimensionally acceptable.) Testing shall be as specified in 4.5.14. 3.6 Markinq. Each machine gun
40、 and each component thereof for which markings are prescribed, shall be clearly marked in accordance with the drawings and MIL-STD-130. Each machine gun shall be identified by a serial number assigned by the procuring activity (see 6.1). 3.7 Workmanship. Workmanship shall be in accordance with MIL-W
41、-13855. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase order, the contractor is responsible for the performance of all inspection requirements (examinations and tests) as specified herein. Except as otherwise specified in the
42、 contract or purchase order, the contractor may use his own or any other facilities suitable for the performance of the inspection requirements s;.ecified herein, - unless disapproved by the Government. The Government reserves the right to perform any of the inspections set forth in this specificati
43、on where such inspections are deemed necessary to ensure supplies and services conform to prescribed requirements. 4.1.1 ResDonsibilitv for compliance. A11 items shall meet all requirements of Sections 3 and 5. The inspection set forth in this specification shall become a part of the contractors ove
44、rall inspection system or quality program. The absence of any inspection requirements in the specification shall not relieve the contractor of the responsibility of ensuring that all products or supplies submitted to the Government for acceptance comply with all requirements of the contract. Samplin
45、g inspection, as part of inanufacturing operations, is an acceptable practice to ascertain conformance to requirements, however, this does not authorize submission of known defective material, either indicated or actual, nor ooes it commit the Government to accept defective material. 8 Provided by I
46、HSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-G-71047 m Ob Li3567174 427 m MIL-G-71047 (AR) 4.1.2 General provisions. Unless otherwise specified 0 herein, the provisions of MIL-W-63150 apply and form a part of this specification. Reference shall be made to
47、MIL-STD-109 to define quality assurance terms used herein. 4.2 Classification of inspections. The inspecticn requirements specified herein are classified as follows: a. First article inspection (see 4.3). b. Quality conformance inspection (see 4.4). 4.3 First article inspection. 4.3.1 Submission. Th
48、e contractor shall submit a first article sample as designated by the Contracting Officer for evaluation in accordance with provisions of 4.3.2. article sample shall consist of the assemblies, components and test specimens listed below in the quantities indicated. The first Name - Machine Gun, Cal .
49、50 Drawinq uanti ty 12949648 15 4.3.2 InsDections to be Derformed. As determined by the Government, the first article assemblies, components and test specimens may be subjected to any or all of the examinations and . tests specified in Table II and be inspected for compliance with any or all requirements of the applicable drawings. 4.3.3 Rejection. If any assembly, component or t
