1、MIL-I-b70B m 9999906 L94962L, 2T5 m Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commanding Officer, Naval Air Warfare Center Aircraft Division Lakehurst, Systems Requirements Department, Cod
2、e SR3, Lakehurst, NJ 08733-5100, by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) -appearing at the end of this document or by letter. 16 September 1993 SUP ERS ED I NG MIL-I-8670A(AS) 26 JUNE 1974 MILITARY SPECIFICATION INSTALLATION OF FIXED GUNS AND ASSOCIAT
3、ED EQUIPMENT IN NAVAL AIRCRAFT This specification is approved for use by the Naval Air Systems Command, Department of the Navy, and is available for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification establishes the minimum requirements for the i
4、nstallation of all types of fixed guns and associated equipment including ammunition feed and ejection systems in naval aircraft. Installation details such as mounting arrangements and fastening devices for the separate component equipments of the gun installations are contained on drawings or in ot
5、her publications specifically applicable to the various equipments. In addition to installation requirements, certain functional requirements for components of the installations are contained herein. Also contained herein are certain inspection and test procedures applicable to the installations cov
6、ered by this specification. This specification does not contain requirements for gun fire control equipment or gun boresight alignment. 1.2 Classification. Fixed gun installation are classified into the following two general types (see 6.2b): a. Wing instal 1 ations: Guns mounted in or on the wings.
7、 b. Fuselage installations: Guns mounted in the fuselage. 0 AMSC NIA FSC 1005 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. Licensed by Information Handling Servicesc 9* MIL-I-6706 99b Lqb25 333 MIL-I-8670B(AS) 2. APPLICABLE DOCUMENTS 2.1 Government documents. * 2
8、.1.1 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 listed in the issue of the Department of Defense Index of Specificati
9、ons and Standards (DODISS) and supplement thereto, cited in the solicitation (see 6.2). SPECIFICATIONS FEDERAL QQ-A-25015 QQ-A-2 5018 MI LI TARY MIL-S-5059 MIL-1-8671 MIL-0-8708 Aluminum Alloy Alclad 2024, Plate and Sheet Aluminum Alloy 5052, Plate and Sheet Steel, Corrosion-Resistant (18-8) Plate,
10、Sheet and Strip Installation of Droppable Stores and Associated Release Systems Demonstration: Aircraft Weapon Systems, General Specifications for (Unless otherwise indicated, copies of federal and military specifications, standards, and handbooks are available from the DODSSP - Customer Service, St
11、andardization Documents Order Desk. 700 Robbins Avenue. Building 4D, Philadelphia, PA 19111-5094.) * 2.1.2 Other Government documents, drawings, and public following other Government documents, drawings, and publicat this document to the extent specified herein. Unless otherw issues are those cited
12、in the solicitat.ion. PUBLICATIONS SD-24 General Wecification for tions. The ons form a part of se specified, the Design and Construction of Aircraft Weapons Systems (Application for copies should be addressed to the Commander, Naval Air Systems Command, Standardization Section, Code AIR-51122E, Arl
13、ington, VA 22243-5110 or DODSSP - Customer Service, Standardization Documents Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094,) 2 Licensed by Information Handling ServicesMIL-I-b70B m 0b L4b2b 078 m MIL-I-8670B(AS) NAVAL AIR SYSTEMS COMMAND TECHNICAL MANUALS NA-11-95M89-1 M8
14、9 Declutching Feeder O NA-11-95M197-1 M197 20MM Automatic Gun (Copies are available from the Naval Aviation Supply Office, Naval Publications and Forms Directory, Code 03443, 5801 Tabor Road, Philadelphia, PA 19120.) * 2.2 Non Government publications. The following document forms a part of this docu
15、ment to the extent specified herein. Unless otherwise specified, the issues of the document which are DoD adopted are those listed in the issue of the DODISS cited in the solicitation. Unless otherwise specified, the issues of the document not listed in the DODISS are the issues of the document cite
16、d in the solicitation (see 6.2). AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) ASTM B 168 Standard Specification for Nickel- Chromium-Iron Alloys. (Application for copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA. 19103-1137.) (Non-
17、Government standards and other publications are normally available from the organizations that prepare or distribute the documents. These documents also may be available in or through libraries or other informational services.) 0 * 2.3 Order of precedence. In the event of a conflict between the text
18、 of this specification 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 Materials. Materials used in fixed gun installations sh
19、all be of the highest quality suitable for the purpose. The materials shall be in accordance with applicable government specifications. materials shall be made in accordance with requirements of SD-24, or the applicable aircraft detail specification. Selection and substitution of 3.1.1 Materials for
20、 ammunition boxes and chutes. Materials used in the construction of ammunition boxes, feed chutes and ejection chutes shall be in accordance with the following specifications, listed in order of preference: QQ-A-250/5: ASTM B 168: MIL-S-5059: QQ-A-250/8: For boxes only For boxes and eject For boxes;
21、 feed and For boxes and eject on chutes only ejection chutes on chutes only 3 Licensed by Information Handling ServicesI 9. MIL-I-8670B m 9999906 1949627 TO4 3.1.2 Materials for blast tubes. Materials used in the construction of blast tubes shall be resistant to corrosion caused by hot gun gases (se
22、e 3.13.3). O 3.2 Required guns and ammunition feed and ejection systems. The number and type of guns and Government-furni shed or contractor-furni shed equipment to be installed in any particular model aircraft shall be as specified in the applicable aircraft detail specification. 3.2.1 Contractor-f
23、urnished equipment. All parts and equipment necessary for the proper operation of the gun and ammunition feed and ejection system(s1, which are not specified in the aircraft detail specification as Government-furnished, shall be furnished and installed by the contractor as required. Installation of
24、contractor-furnished parts and equipment shall be subject to Naval Air Systems Command approval. proposed by the contractor will be considered by the Naval Air Systems Command, but shall not be installed in lieu of specified Government-furnished or approved-type contractor-furni shed equipment, unle
25、ss specifi cal ly approved by the Naval Air Systems Command. Use of new-type equipment 3.3 Required ammunition loads. The gun installations in the aircraft shall urovide for accommodation of the full ammunition load for each gun. Unlessotherwise specified in the applicable aircraft detail Specificat
26、ion, a full load shall consist of a sufficient number of rounds to permit a total of 9.0 seconds minimum firing time at the normal rate of fire of the gun. The ammunition load shall be contained in as few boxes, or drums, as necessary. Although one container for each gun is preferable, the type and
27、number of containers installed for each gun shall be in accordance with the aircraft detail specification. utilized for containing a portion of the full load, but, if so used, the feed chutes must be designed with separate convenient access for loading the ammunition which is in excess of the box ca
28、pacity. The capacity of the ammunition feed chutes may be 3.4 Location of guns. Guns shall be so located that the distance between the guns and the line-of-sight shall be a minimum consistent with aircraft design, with location requirements for other adjacent equipments and with satisfactory operati
29、on of the guns and gun firing control equipment in the aircraft. The location of the guns shall be such that the recoil and blast forces produced by firing will cause no damage to the aircraft structure, instruments, and equipment in the aircraft and will cause no impairment to the operation of the
30、power plant or other aircraft components. shall be given to the location of the guns with respect to electronic equipment; maximum separation shall be maintained between gun supporting structure and electronic equipment supporting structure to prevent malfunction of the electronic equipment due to g
31、un firing vibration. When more than one gun is installed at a station, each gun shall be located as close as practicable to the adjacent gun; the distance between guns to be a minimum consistent with accessibility requirements (see 3.17). Guns shall be so located with respect to the center of gravit
32、y of the aircraft such that the yawing and pitching moments Special attention more than 2 mils he gun firing caused by firing a 4-second burst from all guns do nt reduce deflection of the mean point of contact (MPI) at 800 yards. electrical controls such as relays, power, and supplies shall sufficie
33、ntly remote from the guns to prevent accidental tripp resulting from gun firing vibration. For alignment, see 3.8. be located ng or malfunction 4 Licensed by Information Handling ServicesMIL-I-Bb70B 99999Ob l1949b2 940 = MIL-I-8670B(AS) 3.4.1 Location with respect to propeller disks. Guns shall be l
34、ocated so that in any of the required positions of boresight alignment (see 3.8) clearance as required in 3.16.1 is allowed between the line-of-fire of each gun and the propel ler di sk(s). 3.4.2 Muzzle location. The location of gun muzzles in the fuselage or wings shal be in accordance with the air
35、craft detail specification. The muzzles of the guns shall be displaced a sufficient distance from adjacent radomes or antenna to prevent fatigue failure of the radome or antenna from gun blast. Th s will requlre consideration of gun blast pressure patterns under static and dynamic firing conditions
36、up to the maximum Mach number of the airplane. Available gun blast information will be furnished by the Naval Air Systems Command upon request. lhe gun muzzles shall be adequately located with respect to jet engine air intakes to prevent, to the maximum extent possible, the entrance of gun muzzle ga
37、s into the engine air intake. In meeting this requirement, consideration must be given to the air flow around the engine air intake and the gun muzzles during firing under dynamic flight conditions up to the maximum Mach number and maximum altitude of the aircraft. 3.4.2.1 Location of muzzles in win
38、gs. In wing gun installations, the muzzles shall emerge at points on the wing on the forward extremity of the leading edge as is compat 3.4.2.2 of th wingor as near to it-on the underside of the leading edge ble with satisfactory aircraft and gun performance. Location of muzzles in fuselaqe. Fixed g
39、uns installed in the fuselage sha 1 be properly located so that the adverse effect of gun flash and gun smoke on the pilots vision is minimized. The muzzles shall emerge at a point below the horizontal plane which passes through the foremost point of the nose of the aircraft with the aircraft in lev
40、el flight attitude. 3.4.2.3 Location of guns with respect to other weapons. The guns shall be so located that there will be no mutual interference between the trajectories of the gun projectiles and rockets or other weapons fired or released from the aircraft within the minimum target range determin
41、ed by the armament control system. 3.4.2.4 Location of guns in jet aircraft. In jet aircraft the guns shall be so located as not to cause engine flame out or compressibility stall during or immediately after firing. Should this not be practicable, other means shall be provided to prevent the above e
42、ngine malfunction. 3.5 Location of ammunition containers and feed chutes. Ammunition boxes, drums, and their respective feed chutes shall be so located and installed as to provide a rapid, uninterrupted movement of ammunition to the gun feed mechanism. Installation shall be such that maximum “g“ loa
43、ds in the vertical plane do not interfere with the passage of the ammunition to the feed mechanism (see 3.14). 3.6 Strength requirements for gun installations. Adequate strength shall be provided in the gun mounts, attaching fittings, brackets, supporting members and carry-through structures consist
44、ent with the strength of the aircraft structure for all combinations of translational and rotational velocities and accelerations for which the aircraft detail specification requires that the aircraft be designed. The design-u1 timate and design-yield factors of safety shall be as specified in the a
45、ircraft detail specification. The strength of the 5 Licensed by Information Handling ServicesMIL-I-8biOB 9999906 1949629 883 m d gun mounts and supporting structure shall be adequate to withstand all loads imposed upon them by the reaction forces which occur when the guns are fired singly and simult
46、aneously during under “g“ loads specified in 3.14. The design loads must be carried from the trunnion and distributed into the primary aircraft structure in a manner which will prevent local distortion and fatigue failures. The installation shall be constructed to withstand firing, (without defects
47、resulting) of 30,000 rounds (minimum) from each gun in bursts of 100 rounds minimum per gun from all guns fired simultaneously with cooling periods of minimum duration between bursts as required to prevent overheating of guns. 3.6.1 Gun reaction forces. Fore and aft reaction forces shall be consider
48、ed to act along the barrel centerline of the guns. The value of the average reaction forces considered shall be in accordance with the applicable gun drawings and gun manuals (see 6.3). The natural period of vibration of the gun mounts and supporting structure shall be sufficiently different from th
49、e fundamental and harmonic periods of vibration of the guns to avoid resultant detrimental effects to the mounts, the guns or to the aircraft equipment during firing (see 3.4). 3.6.2 Fabrication of qun mounts and supportinq structure. The gun mounts shall have no loosely fitted Darts or linkages which will cause imriact as the mount or parts thereof change position in response to the forces applied by the gun during firing. be used in the fabrication of gun mounts and supports. Welded assemblies shall be subjected to 100 percent inspection. Clamps shall not be used for
