1、MIL-L-50794 22 January 1973 MILITARY SPECIFICATION LINEAR SHAPED CHARGE ASSEMBLY This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 This specification covers the general requirements for the design, development and preproduction testing
2、of Linear Shaped Charge (LSC) Assem- blies to be utilized for Aircrew Escape Systems. A shaped-Charge Assembly conists of a length of linear shaped charge supported by a housing (re- tainer) two booster tips (one at each end), and such fittings as are needed for attaching to other explosive assembli
3、es. 2. APPLICABLE DOCUMENTS 2.1 The following documents of the issue in effect on the date of in- vitations for bids or request for proposal, form a part of this specification to the extent specified herein. t SPEC IF ICATIONS Mi 1 it ary MIL-C-5541 MIL-1-6866 MIL-1-6868 MIL-F-7179 MIL-S-7742 MIL-1-
4、8500 MIL-A- 862 5 MIL-1-8950 MIL-T-18303 MIL-A-22771 Chemical Film and Chemical Film Material Inspection, Penetrant, Method of Inspection Process, Magnetic Particle Finishes and Coatings: General Speci- fication for Protection of Aerospace Weapons Systems, Structures and Parts Screw Threads, Standar
5、d Optimum Selected Series, General Specification for Interchangeability and Replaceability of Component Parts for Aircraft and Miss iles Anodic Coatings, for Aluminum and Aluminum Alloys Inspection, Ultrasonic, Wrough Metals, Process For Test Procedures; Preproduction Acceptance and Life for Aircraf
6、t Electronic Equip- ment, Format for for Aluminum and Aluminum Alloys Aluminum Alloy Forgings, Heat Treated FSC 1377 Obtained From GLOBAL ENGINEERING DOCUMENTS 2625 So.Hickory St. Santa Ana CA 92707 1 (714)540-9870: (213)624-1216: (i00)8%-7179 Provided by IHSNot for ResaleNo reproduction or networki
7、ng permitted without license from IHS-,-,-_ MIL-L-50774 13 W 77777Ob OY3V353 5 W P Jc MIL-L - 50 7 94 i STANDARDS Mi li t ary Mi L-STD- 130 MIL-STD-143 MIL-STD-331 MIL-STD-453 MIL-S TD- 7 9 4 MIL-STD-810 MIL-STD-889 MIL-S TD-116 6 MIL-STD-1316 lis 17 983 Identification Marking of Military Property S
8、pecifications and Standards, Order of Fuze and Fuze Components, Environmental Inspection, Radiographic Parts and Equipment, Procedure for Packaging and Packing of Environmental Test Methods Dissimilar Metals Radiographic Testing Requirements for Solid Propellant Fuzes, Navy, Design Criteria for Comp
9、ass, Magnetic, Pilots Standby Precedence for the Selection of and Performance Tests For (Copies of specifications and standards required by suppliers in connection with specific procurement function should be obtained from the procuring acti- vity or as directed by the contracting officer.) 2.2 Othe
10、r Publications. The following documents forms a part of this specification to the extent specified herein. Unless otherwise indicated the issue in effect on date of invitation or bids or request for proposal shall apply 6 STANDARDS Navy WS 4660 DIPAM Explosive (U) Purchase Description WS 5003 HNS Ex
11、plosive (U) Purchase Description Industry B46.1 Surface Texture (Application for copies should be addressed to the American National Standards Inbititute (ANSI), 1430 Broadway, New York, N. Y. 3. REQUIREMENT 10018). 3.1 Preproduction. This specification makes provision for preproduction testing . 3.
12、2 Section of Specification and Standards. Specifications and Standards for necessary commodities and services not specified herein shall be selected in accordance with MIL-STD-143. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-L-50774 13 W 77
13、77906 0434354 7 = MIL-L- 50 794 3.3 Material . All materials used in propellant formulation, hardware components, adhesives, etc. shall be in accordance with existing Government specifications. Use of materials not covered by existing Government speci- fications shall require prior approval by the c
14、ognizant design agency. 3.3.1 Dissiuilar metals. Dissimilar metals , as defined in MIL-STD.889 shall not be used In contact with each other. the parts shall be protected in accordance with MIL-F-7179. Where such contact is unavoidable, 3.3.2 Aluminum. The following requirements shall apply. a. Where
15、 a high strength aluminum alloy is required, 7075-T73 in accordance with specification MIL-A-22771, shall be used. (Not for fittings/ connector) b. Ultrasonic inspection requirements for aluminum alloy products shall be in accordance with MIL-1-8950. . 3.3.3 Magnesium and Magnesium Alloys, 3.3.4 Cas
16、tings. The use of castings for structural applications require Magnesium alloys shall not be used. procuring activity approval prior to use. 3.3.5 Fungus proof materials. Materials which are not nutrients for fungi shall be used to the greatest extent practicable. are nutrients for fungi must be use
17、d, such materials shall be treated with a fungicidal agent. Where materials that 3.4 Design linear shaped charge assemblies or connect some functional device directly to the end of a shaped-charge assembly, The assembly shall be sealed to prevent moisture penetration into the area of the Linear Shap
18、ed Charge (LSC) apex prior to functioning. 3.11 Sealing. 3.12 Structural Integrity. When fired under any combination of the en- vironments specified herein, the assembly shall exhibit sufficient structural integrity to prevent backblast or shrapnel from being generated in a manner that might create
19、a personnel hazard within the cockpit area with all internal explosive charges increased 25% over the maximum loading tolerance. d 3.13 Threads. All threads shall be in accordance with Specification MIL- S-7742. 3.14 Junction Fittings. The assemblies shall incorporate junction fittings having thread
20、ed ports to receive the initiating SMDC or LSC. These threaded ports shall be capable of withstanding installation of 90 in-lb. torque in accordance with the following schedule: 3/8-24-UNF-3A THD. 7/16-20-UNF-3A THD. 1/2-20-UNF-3A THD. 5/8-18-UNF-3A THD. Those fittings shall remain intact in port ar
21、eas after firing of the shaped charge. 3.15 Lockwiring. Wherever LSC fittings have lockwire provisions the junction fittings should have lockwire provisions. preferable for LSC assemblies. Self-locking nuts are .4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license f
22、rom IHS-,-,-MIL-L-50794 3 . 16 Exp los ive. 3.16.1 Linear Shaped Charge (LSC) The assembly shall incorporate Linear Shaped Charge (LSC) as the explosive cutting medium. Composition of the LSC shall include an explosive core of hexanitrostilbene (HNS-II), or chemical compound dipicramide (DIPAM Grade
23、 A) in accordance with WS4660 Grade A, contained within an aluminum sheath. The HNS shall fully satisfy the requirements of WS5003 and MIL-STD-1316. 3.16.2 Standoff. The LSC shall be contained within a flexible housing strip whose dimensions are such that, when the face of the housing strip is in co
24、ntact with the surface to be cut, the LSC is positioned at its optimum standoff dis tance. 3.16.3 Output. The explosive output of the LSC shall be sufficient to meet the detailed requirements. 3.17 Explosive transfer. The contractor shall submit details of inter- face alignment for all discontinuous
25、 points of the LSC assembly. Detonation transfer will be subjected to analysis and approval by the procuring agency. 3.18 Inspection - Methods. 3.18.1 General. Any voids, cracks, discontinuities, construction defects, misalignment, or the absence of a component part discovered by any of the in- spec
26、tion techniques described in this section shall be cause for rejection. 3.18.2 Radiopraphic. 3.18.2.1 X-Ray Inspection. All assemblies containing explosive inter- faces shall be radiographically inspected in accordance with Standard MIL- STD-453 in order to confirm the presence, alignment, density,
27、proper posi- tioning and integrity of all explosive components. 3.18.2.2 Neutron Radiographic Inspection. The assemblies shall be neutron ray inspected along their full length prior to forming. reject criteria to be used in the evaluation of the radiographs shall be coordinated between the contracto
28、r and the procuring activity and shall be approved prior to qualification. minimum of 7 years. The accept1 Radiographic film shall be retained for a 3.18.3 Surface. Each component shall be inspected for surface and sub-surface discontinuities. Where appropriate a magnetic particle inspec- tion shall
29、 be performed in accordance with MIL-I-6868B or a similar method. For non-ferrous metals, a penetrant method of inspection shall be performed in accordance with MIL-1-6866. 3.18.4 Leakage Requirements. The assemblies shall be sealed to prevent penetration by water, moisture, and dust with a maximum
30、leakage rate of 1 x std cc/sec of air at- a pressure differential of 1 0.1 atmosphere. All gases 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-L-50774 13 W 7777qOb 0434357 2 W f *- MIL-L-50794 produced by actuation shall be contained to prec
31、lude deleterious effects on aircraft syet 5F Normal Ground None 90% maximum 3.22.2 Service Conditions. The assembly shall operate under the following environmental service conditions or combination of these conditions as speci- fied hereinc 3.22.3 Temperature. The assembly shall be capable of satisf
32、actory opera- tion during and after prolonged exposure to the following temperatures. (a) Storage (b) Service (c) Peak -80“ to +lGOF -65F to +350“F 400F for periods of five minutes 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- . MIL-L-50774 13 3
33、777706 0434358 4 MIL-L- 50 794 3.22.4 a. 3.22.4.1 Forty-Foot Drop. The assemblies shall not initiate and shall be safe to handle and dispose of when dropped from a height of 40 feet. assemblies are not required to operate after being exposed to this condition. The 3.22.4.2 Six-Foot Drop. The assembl
34、ies shall not detonate and shall be capable of satisfactory operation after being subjected to the test specified in 4.5.1.3. 3.22.5 High Temperature. The assemblies shall be capable of withstand- ing the temperatures as specified in 4.5.1.2.8 and shall meet the design per- formance requirements whe
35、n test fired. 3.22.6 Auto Detonation. This is a safety test designed to assure that the system will not be initiated by thermal exposure. ducted a8 specified in para. 4.5.1.2.6. This test shall be con- 3.22 . 7 High temperature exposure (12 hours) . The maximum temperature (within 2S0F) shall be est
36、ablished to which LSC may be exposed for 12 hours and function within design performance requirements when fired after cooling to 70F. exposure test as specified in 4.5.1.2.7. The maximum temperature shall be determined by the high temperature 3.22.8 Temperature-shock/humidity/altitute. The assembli
37、es shall be capable of withstanding temperature shock/humidity/altitude cycling as speci- fied in 4.5.1.2.1 and shall subsequently meet the design performance re- quirements when test fired. 3.22.9 Vibration. The assemblies shall not fire when subjected to After subjection to such vibration, the vib
38、ration as specified in 4.5.1.2.2. assemblies shall meet the design performance requirements when test fired. 3.22.10 - Shock. The assemblies shall be capable of withstanding shock conditions with peak amplitudes of 20 g for a duration of 11 ms as specified in 4.5.1.2.5 and shall subsequently meet th
39、e design performance requirements when test fired. 3.22.11 Dust. The assemblies shall be capable of withstanding exposure - to dust-laden atmosphere as specified in 4.5.1.2.4 and shall subsequently meet the design performance requirements when test fired. 3.22.12 Submerged firing. The assembly shall
40、 shall be capable of firing while immersed in water and at a pressure of 60 psig. 3.23 Product marking. Each assembly shall be clearly and permanently identified with the LSC designation, identifying number, lot number, loading date (month and year), and manufacturers identification symbol. 7 Provid
41、ed by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-L-50774 13 W 977770b OLl34357 b z R MIL-L-50794 Y I - 3.24 Foolproofness. The assemblies shall be designed to prevent incorrect assembly and installation. 3.25 aedness. The LSC shall withstand ordinary ha
42、ndling and manipulation by unskilled personnel throughout the course of shipping, in- spection, installation and service. 3.26 Performance Reliability. The assemblies must meet all per formance requirements at a reliability of not less than 99.9 percent at a con- fidence level of 90% over the temper
43、ature range of -65F to +350F. 3.27 Inadvertent fire probability. The inadvertent fire probability of the LSC shall be zero under any environmental conditios specified herein. Any evidence that the LSC could fire prematurely shall be cause for rejection of the design. ignition of any explosives in th
44、e LSC. An inadvertent firing is defined as an involuntary, or premature 3.28 Life Requirements. The LSC shall have a total life eight years minimum including at least 5 years of service life. During this time, the LSC shall not suffer deterioration or loss of performance beyond the limits speci- fie
45、d herein, 3.29 Storage Life. Storage life is defined as that period during which LSC are stored in their original factory-sealed storage container, and begins with the date of manufacture. Under these conditions the temperature will not exceed the limits of -80F to +160F. being stored in any attitud
46、e. The LSC shall be capable of 3.30 Service Life. Service life is defined as the period of time beginning when the LSC storage container is unsealed and opened, whether the LSC is installed or not. During this period the LSC may experience any com- bination of environmental conditions specified here
47、in. 3.31 Performance. 3.31.1 General. cient to completely sever an 0.063 inch thickness of 2024-T81 aluminum. Each assembly shall provide an explosive .output suffi- 3.31.2 Initiation. The assembly shall be capable of being initiated by the donor SMDC. Each assembly shall contain two separate points
48、 of initiation. 3.32 Development testing. Development tests are conducted to provide data to be used in the design or in support of the design of a specific component or subsystem. Development tests .may be used to determine operating character- istics under off-design conditions. Stress to failure
49、development tests shall be conducted to provide failure mode characteristics for verification of analysis and determination of strength and operating margins of safety. It is 8 c Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-L-50774 13 7777706 0434360 2 9 MIL-L-50794 required that development tests be run on the LSC under simulated thermal en- vironment to assure the desi
