1、NILG-85L03B 10 = 779770b 0363755 9 U s-39-03 MIL-G-85 10% (AS ) 5 May 1982 SUPERSEDING MIL-G-85103A(AS) 15 May 1981 MILITARY SPECIFICATION GUN SYSTEM, 25 MM (AV-8) This specification is approved for use by Naval Air Systems Command, Department of the Navy, a-nd is available for use by all Department
2、s and Agencies of the Department of Defense. 1. SCOPE. 1.1 Scope. This specification establishes the performance, design, manu- facture, test, and acceptance requirements for the 25mm gun system, referred to herein as the gun system. .i 2. APPLICABLE DOCUMENTS. 2.1 Government documents. 2.1.1 Specif
3、ications, standards, and handbooks. Unless otherwise specified, the following specif ications, standards and handbooks of the issue listed in that issue of the Department of Defense Index of Specifications and Standards (DODISC) specified in the solicitation from a part of this specification to the
4、extent specified herein. .- Beneficial comnents (recommendations, additions, deletions).and any pertinent data which may be of use in improving this document. should be addressed to: Conananding Officer, Naval Air Engineering Center, Engineering Specifications and Standards Department (ESSD), Code 9
5、3, Lakehurst, NJ 08733, by using the self addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SPECIFICATIONS MILITARY MIL-T-152 MIL
6、-S-901 DOD-D-1000 MIL-B-5087 MIL-W-5088 MIL-E-5400 MIL-H-5440 MIL-P-5518 MIL-E-605 1 MIL-E-7080 MIL-1-8500 MIL-P-8564 MIL-1-8670 MIL-L-46000 MIL-W-81381 I MIL-G-5103B LO W 7777706 0363756 O -1 MIL-G-85103B(AS) MIL-H-83282 Treatment, Moisture- and Fungus-Resis tant of Communications, Electronic, and
7、Associated Electrical Equipment. Shock Tests, H.I. (High-Impact); Shipboard Machinery, Equipment and Systems, Requirements for. Drawings, Engineering and Associated Lists. Bonding, Electrical, and Lighting Protection for Aerospace Systems. Wiring, Aircraft, Selection and Installation of. Electronic
8、Equipment, Airborne, General Specifica- tion for. Hydraulic Systems, Aircraft, Types I and II Design Installation Requirements for. Pneumatic Systems, Aircraft; Design, Installation, and Data Requirements for. Electomagnetic Compatibility Requirements Systems, Electric Equipment, Aircraft , Selec ti
9、on and Installation of. Interchangeability and Replaceability of Component Parts for Aerospace Vehicles. Pneumatic System Components, Aeronautical, General Specification for. Installation of Fixed Guns and Associated Equipment in Naval Aircraft. Lubricant, Semi-Fluid (Aut,omatic Weapons). Wire, Elec
10、trical, Polyimide-Insulated, Copper or Copper Alloy. Hydraulic .Fluid, Fire Resistant Synthetic Hydro- carbon Base, Aircraft. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Department of The Army, Rock Island Arsenal (Code Indent 19204) AS 1201354
11、5 Production Spec2fica As 12013518 AS1201.3525 STANADS FEDERAL FED-STD-E28 .MILITILRY MIL-STD-109 MIL-129 MIL-STD-130 MIL-STD-143 MIL-STD-46 1 MIL-STD-462 “IL-STD-47 1 MIL-STD-;I 04 MIL-STD-721 MIL-STD-785 HIL-STDIO Mu-882 Ha-STD-1472 MIL-45 6 62 ion, Cartridg 25m, High Explosive Incendiary Tracer,
12、Self-destruct, M792. Product Specification, Cartridge, 25m, Target Practice Tracer, M793. Product Specification,. Cartridge, 25+, Armor Piercing Discarding Sabot Tracer, M791. Screw-Thread Standards for Federal Services. Quality Assurance Tem and Definitions. Marking for-Shipment and Storage. Identi
13、fication Markingof O.S. Military Property. Standards and Specifications, Order af Precedence for the Selection- of. Electromagnetic Emission and Susceptibility Requirements . for the Control of Electromagnetic Inter ference . Electromagnetic Interference Charactevistics, Measurement of . MaintainaEl
14、Sty Ver f icat ion/Demons tra t ion/Evalua tim. Airkraft Electric Power Characteristics. Definitions of Effectiveness Terms for Reliability, Maintainability, Human Factors, and Safety. Reliability. Program for Syatems and Equipment Development and Production. Environmental Test Methods. System Safet
15、y Program Requirements. Human Engineering Design Criteria for Military Systems,.Equipment and Facilities. +libratan System Requirements. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-G-85103B 10 W 9999906 0363758 4 ir MIL-G-85103B(AS) HANDBOO
16、KS MILITARY MIL-HDBK-5 Metallic Materials and Elements for Aerospace Vehicle Structures. MIL-HDBK-237A Electromagnetic Compatibility Management Guide for Platforms, Systems and Equipment. 2.1.2 Other Government documents, drawings, and publications. The following other Government documents, drawings
17、, and publications form a part of this specification to the extent specified herein. DOD 4145.26M pOD Contractors Safety Manual for Ammunition, IExplosives, and Related Dangerous Material. (Copies of specifications, standards, drawings, and publications required by contractors in connection with spe
18、cific procurement functions should be obtained from the procuring activity or as directed by the contracting officer.) 2.2 Other publications. The following documents(s) form a part of this specification to the extent specified herein. The issues of the documents which are indicated as DoD adopted s
19、hall be the issue listed in the current DoDISS and the supplement thereto, if applicable. AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) ASTM E 380-76 Metric Practice Guide. (ANSI 2210.1-1976) (Application for copies should be addressed to the American Society for Testing and Materials, 1916 Race
20、 Street, Philadelphia, PA. 19103.) General Electric Company (Code Ident 05606) A10220 Prime Item Development Specification for Cartridge, 25n11, PGU-20/U (API). (Application for copies should be addressed to the General Electric Company Armament Systems Department, Lake Side Avenue, Burlington, VT 0
21、5402.) J 2.3 Order of precedence. In the event of a conflict between the test of this .specification and the references cited herein, the text of this specification shall take precedence. 3 . REQUIREMENTS. 3.1 Item description. The gun system is a double-ended percussion fired 25 millimeter (mu) aut
22、omatic gun system intended for mounting on the AV-8 aircraft. The gun system consists of a gun Pak mounted on the port side of the fuselage, and ammunition storage and handling pak mounted on the starboard side of the fuselage, and an ammunition crossover unit with chuting and conveyor to transfer 4
23、 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-G-BSL03B LO W 7777906 0363757 b m MIL-G-85103B(AS) ammunition from the ammunition pak to the gun transfer unit in the gun Pak. The gun system is remotely fired by pilot cockpit controls. Major comp
24、onents of the gun system consists of a 25mm gun, gun system drive unit and speed control, ammunition handling system, electrical controls, blast suppressor and structures and fairings. The drive power for the gun system shall utilize engine bleed air. 3.1.1 Gun system functional diagram. The gun sys
25、tem breakdown structure and functional flow block diagram are shown in Figures 1 and 2. 3.1.2 The gun system shall be installed on the integrated into the AV-8 aircraft. The major components shall interface mechanically, functionally, and electrically with each other and with the air- craft in accor
26、dance with the requirements specified herein and in other referenced documents. Gun system interface definition. . 3.1.2.1 Aircraft interface definition. The gun systeni.shal1 be installed on an integrated with the aircraft in accordance with the apKl.icable requirements of MIL-1-8670. The ammunitio
27、n Pak and the gun pak shall mount to the aircraft by means of gun pak attach points. 3.1.2.2 Electrical interface definition. The gun system shall accept, be controlled by, and provide the electrical signals as follows: a. Master arm. The master arm function shall activate the gun control unit. With
28、out this signal, the gun system shall not respond to any control signal. b. Gun select. be replaced in a ready-to-fire condition. The gun select function signal shall cause the gun system to C. Trigger. The trigger function shall cause the gun system to fire. Removal of the trigger signal shall caus
29、e the gun to cease fire and reverse clear. d. Unclear gun signal The system shall provide a signal to the aircraft to indicate that the gun did not clear after firing a burst. e. Rounds remaining. The gun system shall provide a signal to actuate the appropriate counter in the cockpit to indicate She
30、 number of rounds remaining to be fired within - +20 rounds. All control functions shall be 28 volts direct current Vdc nominal. The arm function shall be not greater than 5 ampers (A)maximum. The full firing current shall be not greater than 15 A total. 3.1.2.3 Ammunition interface. The gun system
31、shall accept, store, handle, and fire, without adjustment, Standard Service Class 25mm ammunition as follows (see 3.7.4.1): a. b. M793, Target Practice - Traced (TP-TI, AS12013518. C. XM794, hnnmy Ammunition. M792, High Explosive Incendiary - Trace (HEI-T), AS12013545. 5 Provided by IHSNot for Resal
32、eNo reproduction or networking permitted without license from IHS-,-,-_ RIL-G-85103B LO m 7779706 0363760 2 I- I Q) L c, O L c u r 3 O U Y tu W L m 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-n I- a, r- I I I I I a I 1 I I EI w -4 c 7 I Provide
33、d by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-G-85103B 10 m 0b 0363762 b Il d. PGU-20/U9 Armor Piercing Incendiary (API), A10220. e. M791, Armor Piercing - Discarding Sabot - Traced (APDS-T), AS12013525. The gun shall be capable of handling and firing
34、 this round. Amnunition in the gun shall be smoothly accelerated and decelerated to reduce handling loads, and to increase durability and reliability. 3.1.3 Major components list. The gun system shall consist of, but not be limited to, the components shown in Figure 1. 3.1.4 Government-furnished pro
35、perty (GFP). The following GFP shall be furnished to support contractor testing, as specified in the contract or the purchase order (see 6.2). a. Standard Service Class 25mm ammunition. b. Stalidard Service Class 25mm links. C. Such other materials as may be required, the procurement of which, would
36、 be more expedient if furnished by the Government. 3.2 Characteristics. 3.2.1 Performance. 3.2.1.1 Electrical power. The gun system shall maintain performance as specified herein when supplied with 28 Vdc (nominal) 15 A (maximum) electrical power in accordance with MIL-STD-704 for Category B equipme
37、nt. 3.2.1.2 Dispersion and accuracy. When installed on a restrained AV-8 air- craft or when installed on-a ground firing test stand, the gun system shall place 80 percent minimum of all fired projectiles in 178m (7.0 inches) diameter circle at a range of 25.4 meters (m) (l-,OOO inches) for dispersio
38、n. Data taken during test firing shall be used to determine the location limits of the center of the 80 percent group in relation to the true boresight point for accuracy (see 6.3.1). 3.2.1.2.1 Gun subsystem dispersion. The gun subsystem shall place 80 per- cent minimum of all fired projectiles in a
39、 127mm (5.0 inch) diameter circle at a range of 25.4 m (1,000 inches) for dispersion. Data taken during test firing shall be used to determine the location limits of the center of the 80 percent group in relation to the true boresight point for accuracy (see 6.3.1). 3.2.1.3 Firing rates. The gun sys
40、tem shall be capable .of firing 3,600 rounds per minute. The steady state firing rate shall remain within the limits of 3,400 to 4,000 rounds per minute. The gun system shall fire a minimum of 45 rounds in 1.0 second after application of the trigger on signal. The time between successive bursts, whi
41、ch is the time measured for the last round fired of the previous burst of the first round fired or the succeeding burst, shall be kept to a minimum and shall not exceed 0.8 second. 3.2.1.4 Clearing. The gun eystem shall incorporate positive clearing The cleared gun shall not have any portion of a li
42、ve round in safety features. 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-G-85103B 10 m 7777906 03637b3 9 I the firing barrel chamber or in the firing barrel bolt assembly. The gun system shall automatically clear after each firing burst. Ho
43、wever, the ability of the gun to fire a subsequent burst shall not be delayed until the clearing cycle is complete. The 45 rounds fired in the first second requirement may not be met in this mode. Live rounds shall not be ejected to achieve clearing. The gun, as a component of the gun system shall b
44、e capable of reverse rotational clearing. The gun system, after loading, shall be in a safe cleared condition. 3.2.1.5 Burst firing schedule. The gun system normal burst firing schedule, defined as a burst cycle, shall consist of a continuous burst of at least 1 second, followed by 5 minutes of stat
45、ic ambient cooling. The burst cycle is repeated until the ccnplement of ammunition is exhausted. 3.2.1.6 Extended burst firing. The gun system shall be capable of firing a minimum of 300 rounds of ammunition in a single burst without destructive damage to the gun system or surrounding structure. 3.2
46、.1.7 Recoil forces. The gun system shall reduce recoil forces to a minimum level compatible with the existing aircraft gun Pak attachment pointa. Gun pak recoil forces shall be reacted into the aircraft through the forward pak mounted lugs at station 318.88. 3.2.1.8 Muzzle blast pressure. There shal
47、l be no evidence of structural damage to the aircraft fuselage due to muzzle blast when the gun pak is installed on the aircraft. Muzzle blast pressure may be reduced by a muzzle device . attached to the gun barrels, or built into the gun pak nose structure of a combination of the two methods. The m
48、uzzle blast reduction devices shall cause the muzzle gas force vector to pass through the nominal aircraft center of gravit y. 3.2.1.9 Gun system performance envelope. The gun system shall perform as specified herein when subjected to the AV-8 flight strength envelope of Figure 3. The gun shall oper
49、ate when supplied by aircraft engine bleed air from the engines eighth stage bleed port at pressures and temperatures shown in Figure 4. The gun system shall perform as specified herein whenever bleed air pressure at the engine port equals or exceeds 60 pounds per square inch gage and a minimum of 5.0 cubic feet per second, 3.2.1.10 Bleed air power. 3 . 2.2 Physical characteris
