1、MIL-S-LSBLSC L3 999990b 0300Li73 3 W MIL- S- 19819C (OS) 25 January 1974 Superseding 14 June 1967 MIL-S-l9819B(OS) MILITARY SPECIFICATION SWITCH, FIRING, MARK 8 MODS O AND 1 (INERTIA) (For Exploder Mechanism Mark 19 Series) This specification has been approved by the Naval Ordnance Systems Command,
2、Department of the Navy 1. SCOPE 1.1 Scope. This specification states the requirements for the procure- ment of Firing Switches Mk 8 Mod O (LD 291401) and Mk 8 Mod 1 (LD 480486), which are inertia-operated electric switches having normally open contacts. The switches function on target impact to comp
3、lete a firing circuit. 1.2 Classification. The firing switch described in this specification shall be of one class and one grade but of the following types (see 3.1): Type 1 - Firing Switch Mk 8 Mod O Type II - Firing Switch Mk 8 Mod 1 2. APPLICABLE DOCUMENTS 2.1 The following documents of the issue
4、 in effect on date of invitation for bids or request for proposals form a part of this specification to the extent specified herein. SPECIFICATIONS Federal PPP-B-58 5 Boxes , Wood, Wirebound PPP-B-591 Boxes , Fiberboard, Wood Cleated PPP-B-601 Boxes , Wood, Cleated-Plywood THIS DOCUMENT CONTAINS!.PA
5、GES Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-LSLSC 13 W 979790b 0300474 5 PPP-B-621 Boxes, Wood, Nailed and Lock Corner PPP-B- 636 Boxes, Fiber Mi 1 i tary MIL-P- 116 Preservation, Methods of MIL-E-17555 Electronic and Electrical Equipme
6、nt and Associated Repair Parts, Prepara- tion for delivery of MIL-T-18404 Torpedoes, Environmental Requirements, General Specification for STfLNDARD S Mil i tary MIL-STD-I05 Sampling Procedures and Table for Inspection by Attributes MIL-STD-129 Marking for Shipment and Storage Naval Ordnance Systems
7、 Command LD 291401 LD 480486 Dwg 1277873 Dwg 1277875 Dwg 1472663 Dwg 1472712 2 I. . ; Firing Switch Mark 8 Mod O (Inertia) and all parts and subassemblies listed thereon Firing Switch Mark 8 Mod 1 (Inertia) and all parts and subassemblies listed thereon Firing Switch Subassembly Weigh t As s emb 1 y
8、 Switch Base Assembly Switch Base Assembly Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-1781qC 13 97797Ob O300475 7 MIL-S-19819C (OS) PUBLICATIONS Naval Ordnance Systems Command OR- 11 OS 6341 -ovelopment of Packaging, Handling, Storage and
9、Transportation Systems for Weapons Miscellaneous General Design Require- ments (Copies of specifications, standards, drawings, and publications required by contractors in connection with specific procurement functions should be obtained from the procuring activity or as directed by the contracting o
10、f- ficer.) 3. REQUIREPENTS 3.1 Description. Firing Switches Mk 8 Mod O and Mk 8 Mod 1 shall be inertia-operated, ball-type electric switches with normally open contacts. The switches shall consist of a ball weight assembly and terminal assembly encased in a hermetically sealed metallic shell. One co
11、ntact pin shall be connected internally to the ball weight, and the other contact pin shall be grounded to the shell. The contact pins shall plug into an electrical recep- tacle at the base of the cavity there the switch is installed. The Mod O and Mod 1 switches have identical working parts and dif
12、fer only in one re- spect: The Mod O has an external plastic housing which encases the metallic shell; the Mod 1 has no housing external to the shell. 3.2 General requirements 3.2.1 Preproduction samples. Unless otherwise specified in the contract or order , preproduction samples of the firing switc
13、h shall be manufactured using the methods and procedures proposed for the production. The sample will be tested as specified in Section 4 herein and is for the purpose of determining, prior to production, that the contractors production methods are capable of yielding items that comply with the tech
14、nical requirements of the contract. 3.2.2 Naterials. Unless otherwise specified in the contract, requisition, or order, all materials and purchased parts entering into the final assembly of the firing switch shall conform strictly to the detailed requirements in- dicated on the drawings and specific
15、ations listed in LD 291401 or LD 480486. 3.2.3 Ion, and dimensions. Finishes, coating, construction, and dimensions for the firing switch shall be strictly in 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-HIL- S- 19819C (OS) accordance with the a
16、pplicable drawings, specifications, and publications listed in LD 291401 or LD 480486. 3.2.4 Moisture, fungus, and corrosion. The firing switch shall be ren- dered moisture, fungus, and corrosion resistant as required by OS 6341 and in accordance with detail requirements specified in the drawings an
17、d speci- fications listed in LD 291401 or LD 480486. 3.2.5 Marking. Marking of assemblies, subassemblies, and parts shall be .in accordance with the applicable drawings listed in LD 291401 or LD 480486. 3.2.6 ConflictinP requirements. In the event of conflict between the documents referenced herein
18、and the contents of this specification, the con- tents of this speciication shall apply. 3.3 -Definitions. The environmental requirements of this specification are defined in MIL-T-18404. 3.4 Performance requirements and product characteriskics. The firing switch shall meet the following performance
19、 requirements and product char- acteristics: 3.4.1 Ball staking. After the ball is staked in position during the as- sembly of the weight base, the ball shall resist, without perceptible rota- tion, a 2.5 inch-pound torque applied in either direction about the axis of the shaft. 3.4.2 Pigtail wire s
20、ecurement. The pigtail wire, as secured in the weight base by the bushing, shall withstand without loosening or separating from the base a 1-pound pull applied along the axis of the weight base. 3.4.3 Airtightness. The firing switch subassembly, Drawing 1277873, shall not leak air when the external
21、air pressure is reduced to 15 inches of mer- cury. 3.4.4 Sensitivity. When the firing switch is accelerated in such a direc- tion that the ball is urged along the main axis toward the nose cap, the switch shall not close with an applied acceleration up to 5.0 gravity units, shall close instantaneous
22、ly before the applied acceleration -reaches 8.0 gravity units, and shall reach a state of steady closure before the applied acceleration reaches 8.5 gravity units. Instantaneous closure shall be con- sidered obtained when a pip is observed on the oscilloscope during testing as specified in 4.4.4.4.3
23、. Steady closure shall be considered obtained when a straight line (with possible hash due to equipment circuitry) is ob- served on the same oscilloscope screen. When the switch is accelerated in a direction perpendicular to the main axis, it shall not close with an ap- plied acceleration up to 3.5
24、gravity units, shall close instantaneously 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-29LSC 13 m 9979906 0300q77 O m MIL-S-I9819C(OS) before the applied acceleration reaches 6.0 gravity units, and shall reach a state of steady closure be
25、fore the applied acceleration reaches 6.5 grav- ity units. 3.4.5 Contact resistance. The contact resistance of the switch during steady closure shall be not more than 0.5 ohm, as measured between the two terminals of the switch. 3.4.6 Dielectric strength. When the firing is in the normally open con-
26、 dition, the insulation resistance, as measured between the terminals of the switch, shall be not less than 10 megohms under an applied potential of 500 volts direct current (dc). 3.4.7 Operating. The firing switch shall have an operating life of not less than 100 complete cycles as defined in 4.3.5
27、.1. 3.4.8 Pressure,(Type I only). The Type I firing switch assembly shall withstand a pressure of 750 psig, applied to the outer face of the firing switch, without breaking, deforming, or showing evidence of leakage through the housing. 3.5 Environmental requirements. The firing switch shall meet th
28、e other applicable requirements of this specification after or while being subjected to environmental conditions defined below, when tested as specified in Sec- tion 4. 3.5.1 Vibration 3.5.1.1 Vibration;ting or ready condition. The firing switch, less pack or packaging and rigidly self-mounted on a
29、vibration device as specified in 4.3.1.1, shall be capable of withstanding vibrations of 3gs over the frequency range of 10 to 100 Hz in each of three mutually perpendi- cular planes for time periods and temperatures as specified in 4.3.1.1. Thereafter, the switch shall show no damage and shall be c
30、apable of meeting all the performance requirements and product characteristics of this speci- f ication. 3.5.1.2 Vibration; operating condition. The firing switch, self-mounted on a vibration device as specified in 4.3.1.2, shall be capable of with- standing vibrations of lg over the frequency range
31、 of 20 to 150 Hz in each of three mutually perpendicular directions for time periods and temperatures as specified in 4.3.1.2. Thereafter, the switch shall show no damage and shall be capable of meeting all the performance requirements and product characteristics of this specification. 5 Provided by
32、 IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-LSBLSC 13 SSSSSOb 0300Y78 2 W MIL- S - 1981 9C (OS) 3.5.1.3 Vibration; transportation. The firing switch, after being sub- jected to the tests specified in 4.3.1.3, shall show no damage and shall meet all th
33、e performance requirements and product characteristics of this specification. 3.5.2 Sh.ock 3.5.2.1 Shock; ready condition. The firing switch, self-mounted on a shock testing device as specified in 4.3.2.1, shall be capable of with- standing a shock of 150g peak magnitude, of not less than 8 ms pulse
34、 dura- tion, and approximating a one-half sine wave pulse. shall show no damage and shall be capable of meeting all the performance requirements and product characteristics of this specification. Thereafter, the switch 3.5.2.2 Shock: transportation, storage, and handlinq. The firing switch, after be
35、ing subjected to the test specified in 4.3.2.2, shall show no damage and shall meet all the performance requirements and product characteristics of this specification. 3.5.3 Acceleration. The firing switch, mounted securely on an accelera- tion device as specified in 4.3.3, shall be capable of withs
36、tanding an ac- celeration of 15gs applied for not less than 0.2 second. Thereafter, the switch shall show no damage and shall be capable of meeting all the perform- ance requirements and product characteristics of this specification. 3.5.4 Temperature and humidity 3.5.4.1 Transportation and storage
37、condition. The firing switch, packaged and packed as defined in Section 5, shall be capable of withstanding trans- portation and storage temperatures and humidities between minus 65 degrees F and plus 160 degrees F for a period of 28 days, as specified in 4.3.4.1. Thereafter, the switch, less pack o
38、r packaging, shall show no corrosion or damage and shall be capable of meeting all the performance requirements and product characteristics of this specification. 3.5.4.2 High and low temperature operation. The firing switch, less pack and packaging and mounted as specified in 4.3.4.2, shall be capa
39、ble of with- standing temperatures over the range of minus 40 degrees F to plus 130 degrees F, as specified in 4.3.4.2. At the conclusion of the test, and while still at the test temperature, the switch shall show no corrosion or damage and shall be capable of meeting all the performance requirement
40、s and product character- istics of this specification. 3.6 Cleanup. Prior to and after final assembly, all components shall be thoroughly cleaned of loose, spattered, or excess solder, metal chips, and other foreign matter. 6 Provided by IHSNot for ResaleNo reproduction or networking permitted witho
41、ut license from IHS-,-,-MIL-S-19819C (OS) 3.7 Workmanship. The firing switch, including all parts and accessories, shall be constructed and finished in a manner to ensure compliance with all requirements of this specification. neatness and thoroughness of soldering, wiring, marking of parts and as-
42、semblies, plating, staking, and freedom of parts from burrs and sharp edges. The standards of workmanship exhibited in any approved preproduction sample, subject to any qualification stated in the Governments notice of approval, shall be determinative of the requirements of the contract relative to
43、work- manship insofar as not specifically covered by applicable specifications. Particular attention shall be paid to 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the con- tract or purchase order, the supplier is responsible for the performance of
44、all inspection requirements as specified herein. Except as otherwise speci- fied in the contract or order, the supplier may use his om or any other facilities suitable for the performance of the inspection requirements speci- fied herein, unless disapproved by the Government. The Government reserves
45、 the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. 4.1.1 Classification of inspections. Inspection of the firing switches shall be classified as follows: (a) Prepr
46、oduction inspection (paragraph 4.3) (b) Quality conformance inspection (paragraph 4.4) (c) Periodic production inspection (paragraph 4.3) 4.2 Sampling 4.2.1 Preproduction sample. A preproduction sample of five firing switches manufactured in accordance with 3.2.1 shall be subjected to the preproduct
47、ion tests detailed in 4.3 at an activity designated by the procuring activity. Acceptance of the preproduction sample shall be based on no defects in the sample. approval of the preproduction sample, shall be at the suppliers risk. Further production of the switches by the supplier, prior to the 4.2
48、.2 Periodic production sampling. Periodic production samples shall be randomly selected from units that have satisfactorily passed the quality conformance inspections of 4.4. These samples shall be subjected to the tests of 4.3 at an activity designated by the procuring activity. production sampling
49、 shall be as foiiows: Periodic 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL- S- 19819C (OS) Step 1, Upon initiation of production randomly select one unit from each group of 10 units. compliance of samples selected from 3 consecutive groups, shift to Step 2. Upon satisfactory Step 2, Randomly select one unit from each group of 25 units. Upon satisfactory compliance of samples sele
