1、MIL-E-50796 33 m 999990b 0333208 7 I, MIL-E-50796 12 June 1973 MILITARY SPECIFICATION EXPANDING SHIELDED MILD DETONATING CORD ASSEMBLY This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 General.- This specification covers the general req
2、uirements for the design, development and preproduction testing of Expanding Shielded Mild Detonating Cord Assembly (ESMDC) to be utilized for aircrew escape systems. This assembly is used in separation systems to remove fastenings between two units and impart a thrust to separate these units withou
3、t contamination of the adj acent area. 2. APPLICABLE DOCUMENTS 2.1 The following documents of the issue in effect on the date for bids or request for proposal, form a part of this specification to the extent speci- fied herein. SPECIFICATIONS Federal QQ-A- 2 O O QQ-A-225 FED-STD-5 95 Mil it ary MIL-
4、C-554 1 MIL-H-6875 MIL-F-7179 MIL-S-7 742 Aluminum Alloy, Bar, Rod, Shapes, Tube and Wire, Extruded and Structural Shapes, General Specification for? Aluminum and Aluminum Alloy Bar, Rod, Wire or Special Shapes; Rolled Drawn or Cold Finished, General Specifica- tion for Colors Chemical Film and Chem
5、ical Film Material for Aluminum and Aluminum Alloys Inspec- tion, Penetrant, Method of Inspection Process, Magnetic Particle Heat Treatment of Steels (Aircraft Prac- tice Process for) Finishes and Coatings: General Specifi- cation for Protection of Aerospace Wea- pons Systems, Structures and Parts S
6、crew Threads, Standard Optimum Selected Series, General Specification for FSC 1377 THIS DOCUMENT CONTAINS 2.0 PAGES. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-E-507 9 6 MIL- 1-85 O0 MIL-A-8625 MIL-T-18303 MIL-P-22808 MIL-P-2 337 7 MIL-D-100
7、0 MIL-L-81352 STANDARDS Military MIL-STD-14 3 MIL- STD-3 3 1 MIL-STD-453 MIL-STD-7 94 MIL-STD-810 MIL-STD-831 MIL-STD-882 MIL- STD-8 89 MIL- STD-116 6 MIL-E-50796 13 U 7797706 0333207 7 m MIL-STD-1316 MS17983 Interchangeability and Replaceability of Component Parts for Aircraft and Missiles Anodic C
8、oatings, for Aluminum and Aluminum Alloys Test Procedures; Preproduction Accept- ance and Life for Aircraft Electronic Equipment , Format for Paint, Epoxy, Hydraulic Fluid Resistant Primer Coating, Epoxy Polyamide, Chemi- Drawings, Engineering and Associated Lists Lacquer: Acrylic (for Naval Weapons
9、) cal and Solvent Resistant Specifications and Standards, Order of Fuze and Fuze Components, Environmental Inspection, Radiographic Parts and Equipment, Procedure for Packaging and Packing of Environmental Test Methods Test Reports, Preparation of System Safety Program Dissimilar Metals Radiographic
10、 Testing Requirements for Solid Propellant Fuses, Navy, Design Criteria for Compass, 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 fr
11、om the procuring acti- vity or as directed by the contracting officer.) 2.2 Other Publications.- The following documents forms a part of this Unless otherwise indicated the specification to the extent specified herein. issue in effect on date of invitation for bids or request for proposal shall appl
12、y HANDBOOKS Military MIL-HDBK-5 Metallic Mgterials and Elements for Aerospace Vehicle Structures 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-E-5 07 96 ANA-438 WS 4660 WS-5003 Age Controls of Age Sensitive Elasto- Dipam Explosfve (U) Purchas
13、e Description HNS Explosive (U Purchase Description meric Items (Application for copies should be addressed to the American National Standards Institute (ANSI), 1430 Broadway, New York, N. Y. 10018. 3. REQUIREMENTS 3.1 Preproduction,- This specification makes provision for prepro- duction testing. 3
14、.2 Selection of Specification and Standards.- Specifications and Standards for necessary commodities and services not specified herein shall be selected in accordance with MIL-STD-143. 3.3 Materials.- All materials used in propellant formulation, hard- ware components, adhesives etc., should be in a
15、ccordance with existing govern- ment specifications. Use of materials not covered by existing Government specifications shall require prior approval by the cognizant design agency, 3.3.1 Metals.- Metals shall be of the corrosion resisting type or shall be suitably protected to resist corrosion in al
16、l the envronments re- quired by this specification, when in storage or during normal service life. Unless otherwise specified herein, physical properties of all metals shall meet the minimum requirements specified in MIL-HDBK-5. 3.3.1.1 Dissimilar Metals,- Dissimilar metals, as defined in MIL-STD- 8
17、89, shall not be used in contact with each other, where such contact is una- voidable, the parts shall be protected in accordance with MIL-F-7179. 3.3.1.2 Heat treatment,- Heat treatment of steel parts shall be in accordance with Specification MIL-H-6875. 3.3.1.3 Aluminum.- Where a high strength alu
18、minum alloy is required, 7075-T73 202411 in accordance with Specification QQ-A-225 (wrought) and QQ-A-200 shall be used, 3.3.1.4 Magnesium and magnesium alloys.- Magnesium and magnesium alloys shall not be used, 3.3.1.5 Castings,- When used, castings for structural applications re- quire procuring a
19、ctivity approval prior to use. 3.3.2 Limited life items.- The use of materials and elements whose life is anticipated to be less than the required life of the assemblies shall not be used. 3.3.3 Reaction of materials.- Materials shall not be used which may produce and emit toxic, nauseating, or corr
20、osive products under the environ- 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-E-50796 13 9977906 0331211 7 mental conditions specified herein. of functioning in the fluids, vapors or gases specified herein, before, during and after exposure
21、 to all the environmental conditions specified herein. in addition, materials shall be capable 3.3.4 Non-metals.- When plastics, elastomeric and nonmetallic materials other than military approved articles are used, adequate proof of their suitability shall be submitted along with test articles submi
22、tted for evalua- tion testing. The use of these articles shall be with proper consideration of their resistance to air and hydraulic fluid (where applicable) including the special problems of dimensional stability, aging characteristics, moisture absorption, and thermal embrittlement. Liquids shall
23、not be used in final assembly unless approved by the pro- Age controls for elastomers shall be in accordance with ANA curing activity. Bulletin No. 438. 3.3.5 Fungus-proof materials.- Materials which are not nutrients for fungi shall be used to the greatest extent practicable. that are nutrients for
24、 fungi must be used, such materials shall be treated with a fungicidal agent. Where materials 3.3.6 Parts. 3.3.6.1 Inspection of metal parts.- All high stress steel parts shall be subjected to magnetic particle inspection in accordance with Specification MIL-1-6868 or a similar method. Titanium, alu
25、minum or nonmagnetic steel high stress parts shall be inspected in accordance with Specification MIL-1-6866 penetrant inspection. 3.3.7 Protective treatment.- All materials used which are not inherently corrosive resistant, shall be treated in accordance with Specification MIL-F- 7179 to resist any
26、corrosive effects resulting from the environmental condi- tions specified herein. Any protective coatings used shall not crack, chip, erode, scale with age or degrade the structural integrity of the materials used in construction of the assemblies when exposed to conditions specified herein. 3.3.7.1
27、 Aluminum.- All aluminum and aluminum alloys shall be anodized the absence of abrasive conditions, the anodize may be Type I coating where applicable. Repair or touch up shall be by application of chemical film in accordance with Specification MIL-C-5541. Grade B. 3.3.7.2 Priming and-painting,- In a
28、ddition to the surface treatments herein, all external surfaces of the assemblies shall be primed and painted as follows, except where such finish would impair proper function. (a) or MIL-P-22808. One coat of epoxy primer conforming to Specification MIL-P-23377 4 Provided by IHSNot for ResaleNo repr
29、oduction or networking permitted without license from IHS-,-,-MIL-E-50796 cb) One acrylic or epoxy topcoat conforming to Specification MIL-L- 81352. (c) Color in accordance with Specification FED-STD-595 and subject to procuring activity approval. 3.4 Design and construction. 3.4.1 Weight (Guarantee
30、d).- The guaranteed weight of the assemblies and the inert connectors shall be kept to a minimum consistent with the re- quirements of this specification. 3.4.2 Interchangeability.- All parts having the same manufacturers The drawing number requirements of MIL- part number shall be functionally and
31、dimensionally interchangeable as de- fined in Specification MIL-1-8500. D-70327 shall govern the changes in manufacturers part numbers. 3.4.3 Workmanship.- Workmanship shall be in accordance with high grade aircraft practice and of a quality to assure safety, proper operation, and service life, qual
32、ity control, Workmanship shall be inspected and certified by the contractor 3.4.4 Radiographic inspection, 3.4.4.1 X-ray inspection,- The assemblies shall be x-ray inspected along their straight length and ends only after forming, in accordance with MIL-STD-453. X-ray film shall be retained. The acc
33、ept/reject criteria to be used in the evaluation of the x-rays shall be coordinated between the contractor and the procuring activity and shall be approved prior to quali- f ication. 3.4.5 Residual magnetism.- All parts made of materials that are capable of retaining residual magnetism shall be dema
34、gnetized sufficiently to prevent component malfunction due to accumulation of magnetic contaminants. 3.4.6 Installation requirements. The production assembly configura- tions shall correspond to the inert masters furnished by the procuring activity. 3.4.7 Sealing requirements.- The assemblies shall
35、be sealed to prevent All gases penetration by water, moisture, and dust with a maximum leakage rate of 1 x std cc/sec of air at a pressure differential of i+ 0.1 atmosphere. produced by actuation shall be contained to preclude deleterious effects on aircraft systems and occupants. 3.4.8 Threads.- Al
36、l threads shall be in accordance with Specification MIL-S-7742, 3.4.9 End fitting strength.- The end fitting joint between the outer ferrule and the stainless steel tubing shall be capable of withstanding a tensile load of 1000 lbs. minimum applied at a rate of 8 4 2 pounds per second. The specimen
37、need not function after the test. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-E-3 O 7 9 6 3.4.10 Structures, 3.4.10.1 Structural integrity.- The ESMDC assembly shall be constructed such that the portion of the assembly, external of the ESMDC
38、port, remains in- tact without rupturing, splitting, cracking or disengaging from the end fittings and without emitting shrapnel when fired in the “as installed“ condition at +350“F after being stabilized at this temperature for one hour. This assembly is required to meet the aforementioned when fir
39、ed with the end tips or boosters confined in blind ports having a free volume of not greater than 0.03 cubic inches * 3.4.11 Detonating cord charge.-: The detonating cord (DC) charge shall be the chemical compound hexanitrostilbene (HNS-II) Grade A in accordance with Publication WS5003 or chemical c
40、ompound Dipic Ramide (Dipam Grade A) in accordance with WS4660 and shall meet the sensitivity requirements of MIL-STD- 1316, The minimum detonating velocity, moisture content, and core loading toler- ance of the DC shall be determined by the contractor and acceptable values agreed upon by the procur
41、ing activity and contractor prior to the beginning of preproduction testing. specified in 3.5 and the reliability requirements specified herein“. The DC charge shall meet the performance requirements 3.4.12 Explosive transfer.- Designs of interface alignroents for all discontinuous points of the ass
42、embly shall be subject to analysis and approval by the procuring agency, MIL-E-50796 13 W 9999906 0331213 0 0 3.4.13 Explosive cord sheath.- The explosive cord shall consist of an explosive cor e.g., oscillograph, oscilloscope, or magnetic - - tape. Transducers may be any state-of-the-art type; e.g.
43、, piezo-electric, strain gage, variable reluctance, capacitive, or potentiometer. However, accuracy of all test apparatus shall conform to the requirements of MIL-STD-810. Documented calibration records will be maintained and be available for inspec- tion by the cognizant design agency. 4.4 Test met
44、hods. 4.4.1 Component inspection.- Each part of the assembly shall be 100 percent inspected for conformance in the applicable drawing. 4.4.2 Examination of product,- Examination of the assemblies shall be made to detect visible defects and to determine that the assemblies meet the finish, and markin
45、g requirements and that they conform to the applicable draw- ing. 10 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-E-5 07 96 4.4.3 Leak detection.- All assemblies shall pass a dry gas leak test. Assemblies which exhibit a leak rate in excess of
46、 10-5 per second of air at a pressure differential of 1 - -k 0.1 atmosphere shall be considered defective. 4.4.4 Demagnetization test.- The assembly shall be checked for residual magnetism in an area free of local magnetic effects by placing the device 6 inches from a pilots standby compass, type MS
47、17983 or equivalent, in a north- south horizontal position with the compass placed in an east-west heading as shown in Figure 1. The assembly shall be placed at the same height from the floor as the compass in a longitudinal direction along its entire length. This procedure shall be repeated for eve
48、ry 90 degrees rotation of the device. The assembly shall not deflect the compass more than three degrees. 4.4.5 X-ray inspection.- The assemblies shall be x-ray inspected along their straight length and ends only after forming, in accordance with Standard MIL-STD-453. The accept/reject criteria to b
49、e used in the evaluation of the x-ray shall be coordinated between the contractor and the procuring activity prior to commencement of production. 4.5 Preproduction tests.- Preproduction tests shall be made on equip- ments representative of the production equipments to be supplied under the contract. Prepraduction tests shall be accomplished under the approved test procedure of 4.7. NOTE: When preproduction tests are to be -de on equipments manufactured i
