1、AMSC N/A FSC 5985 INCH-POUND MIL-DTL-7879E 25 June 2013 SUPERSEDING MIL-DTL-7879D 31 January 2008DETAIL SPECIFICATION ANTENNA AT-141A/ARC This specification is approved for use by the Naval Air Systems Command and is available for use by all Departments and Agencies of the Department of Defense. 1.
2、SCOPE 1.1 Scope. This specification establishes the requirements for antenna type AT-141A/ARC which is streamlined blade, transmitting and receiving antenna used with airborne communication equipment operating over the frequency band of 225 to 400 Megahertz (MHz). The equipment covered by this speci
3、fication shall be of one type and shall consist of the following: Maj. Unit Type Designation Size (in) Max. Allow. Weight (lbs.) Applicable Paragraphs Antenna AT-141A/ARC 15 x 8.875 x 1.5 2.5 3.2 and 3.3 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in secti
4、ons 3 and 4 of this specification. This section does not include documents cited in other sections of this specification or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must mee
5、t all specified requirements documents cited in sections 3 and 4 of this specification, whether or not they are listed. 2.2 Government documents. 2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a part of this document to the extent specifie
6、d herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-T-152 - Treatment, Moisture and Fungus Resistant of Communications, Electronic and Associated Electrical Equipment. MIL-DTL-15024 - Plates, Ta
7、gs, and Bands for Identification of Equipment, General Specification for MIL-DTL-18307 - Nomenclature and Identification for Aeronautical Systems Including Joint Electronics Type Designated Systems and Associated Support Systems. MIL-PRF-39012 - Connectors, Coaxial, Radio Frequency General Specifica
8、tion for. Comments, suggestions or questions on this document should be addressed to DLA Land and Maritime, ATTN: VAT, Post Office Box 3990, Columbus, OH 43218-3990, or emailed to Tubesampsdla.mil. Since contact information can change, you may want to verify the currency of this address information
9、using the ASSIST Online database at https:/assist.dla.mil. INACTIVE FOR NEW DESIGN AFTER 31 JANUARY 2008 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-7879E 2 DEPARTMENT OF DEFENSE STANDARDS MIL-STD-810 - Environmental Engineering Considera
10、tions and Laboratory Tests. (Copies of these documents are available from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094 or from https:/assist.dla.mil.) 2.2.2 Other Government drawings. The following Government drawings form a part of this docum
11、ent to the extent specified herein. Unless otherwise specified, the issues are those cited in the solicitation. OTHER DRAWINGS 52A1D40-1 - Bureau of Aeronautics Drawing: Antenna AT-141A/ARC, Outline and Detail Drawing. (Inquiries to obtain this document should be directed to Commander, Naval Air Sys
12、tems Command Systems Standardization Division Code 4L8000B120-3 Highway 547 Lakehurst, NJ 08733-5100 or from dwight.tabitnavy.mil.) 2.3 Non-Government publications. The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of the docu
13、ments which are those cited in the solicitation or contract. AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) INTERNATIONAL ASTM-D295 - Standard Test Methods for Varnished Cotton Fabrics Used for Electrical Insulation. ASTM-D3955 - Standard Specification for Electrical Insulating Varnishes. (ASTM p
14、ublications are available through ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959 or from http:/www.astm.org.) IPC - ASSOCIATION CONNECTING ELECTRONICS INDUSTRIES IPC J-STD-004 - Soldering Fluxes Requirements For. IPC J-STD-005 - Soldering Pastes Requirements For. IPC J-S
15、TD-006 - Electronic Grade Solder Alloys And Fluxed And Non-Fluxed Solid Solders For Electronic Soldering Applications Requirements For. (Copies of these documents may be purchased from IPC - 3000 Lakeside Drive, Suite 309S Bannockburn, Illinois 60015-1249; Tel 847 615.7100; Fax 847 615.7105 or from
16、http:/www.ipc.org/.) SAE INTERNATIONAL (SAE) AEROSPACE MATERIALS SPECIFICATIONS (AMS) SAE-AMS-C-83231- Coatings, Polyurethane, Rain Erosion Resistant for Exterior Aircraft and Missile Plastic Parts. (Society of Automotive Engineers documents are available through SAE International, 400 Commonwealth
17、Drive, Warrendale, PA 15096-0001, or from http:/www.sae.org.) (Non- Government standards and other publications are normally available from the organizations which prepare or which distribute the documents. These documents may be available in or through libraries or other informational services) Pro
18、vided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-7879E 3 2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict between the text of this document and the references cited herein, the text of this doc
19、ument takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 Parts and materials. In the selection of parts and materials, fulfillment of major design objectives shall be the prime considerati
20、on. Materials and parts shall be used which meet or exceed the performance requirements of the respective standard specifications. Materials shall meet general requirements such as being nonflammable, fungus resistant and nontoxic and being capable of satisfying environmental conditions specified in
21、 MIL-STD-810. 3.1.1 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally preferable materials should be used to the maximum extent possible provided that the material meets or exceeds the operational and maintenance requirements, and promotes economic
22、ally advantageous life cycle costs. All components supplied shall be new and unused. 3.1.2 Design objectives. Minimum size and weight, simplicity of operation and improvement in performance and reliability of specific functions beyond the requirements of this specification are objectives in the desi
23、gn of the equipment specified herein. Materials, parts and processes shall foster reduction in size and weight and improvement in simplicity or performance. 3.1.3 Plating. Surface plating in accordance with accepted industry practices shall afford corrosion protection equal to or exceeding that of c
24、admium plating. Surface plating shall be used to insure electrical contact between brass and aluminum alloy metal. Cadmium plating shall not be used without technical justification to the acquiring activity that no other plating can meet performance requirements. 3.1.4 Soldering. Soldering materials
25、, fluxes, and procedures for soldering and cleaning shall be non-corrosive and consistent with Joint Industry Standards IPC J-STD-004, IPC J-STD-005 and IPC J-STD-006. Mechanical loads shall not be imposed on soldered connections. 3.1.5 Dielectric material. The dielectric material(s) used between th
26、e stub and the sleeve of the antenna shall be chosen so the antenna will best fulfill the requirements of this specification. If impregnated glass cloth is used in the construction of the antenna it shall be of suitable fine mesh and shall be impregnated with suitable polyester resin. 3.2 General de
27、sign requirements. 3.2.1 General. The antenna shall meet general design and performance requirements as follows: 3.2.2 Construction. The antenna shall have the airfoil mounting dimensions, and general features of construction as shown on Bureau of Aeronautics Drawing 52A1D40-1. The bottom portion of
28、 the antenna, which mates with the outer surface of the aircraft skin, shall be so designed as to permit essentially a high pressure electrical contact between the aircraft skin and the periphery of the base surface of the antenna, and at the same time allow for the use of a small moisture sealing g
29、asket within the periphery of the base, without interfering with the electrical contact with the skin. Best manufacturing practices shall be employed to secure the dielectric portion of the antenna to its upper and lower metal portions and to insure adequate structural strength of the antenna. The e
30、xternal dielectric surface shall be coated with a non-conducting, low loss dielectric material to prevent absorption of moisture or the formation of a film of moisture on the surface. In addition a Class I rain erosion coating shall be applied to the antenna in accordance with the requirements of sp
31、ecification SAE-AMS-C-83231. 3.2.3 Mechanical strength. The antenna shall be designed to withstand a uniformly distributed lateral ultimate design load of 9.5 pounds per square inch. 3.2.4 Mating surfaces. Electrically conducting mating surfaces shall be clean metal surfaces, free from grease, paint
32、 lacquer, anodizing or similar or similarly resistive film so as to insure negligible radio frequency impedance. Unless suitably protected against electrolytic corrosion, dissimilar metals shall not be used in intimate contact with each other or where water surface film may provide electrolytic cont
33、act. 3.2.5 RF connectors. The radio frequency (RF) connector included as part of the antenna shall be designed to accommodate plug M39012/1-0005, in accordance with MIL-PRF-39012. 3.2.6 Safety. All internally and externally threaded parts shall be made positively safe by the use of lock washers, loc
34、k nuts, or other suitable methods. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-7879E 4 3.2.7 Weight. The antenna shall be of the lightest practicable weight consistent with the other requirements of this specification. The installed weigh
35、t of the antenna shall not exceed 2.5 pounds. Installed weight shall include the complete antenna assembly with nameplate and receptacle, but shall not include cabling, external to the antenna, plugs, mounting nuts or bolts, or any mounting bracket or fastening device which is not an integral part o
36、f the antenna assembly. 3.2.8 Tropics adaptation. Antennas covered by this specification shall be adapted for tropical environments in accordance with MIL-T-152, ASTM-D3955 and ASTM-D295. 3.2.9 Interchangeability (see 6.5). Interchangeability shall be measured against a model, manufacturing drawings
37、 or other technical information as provided for that purpose. 3.2.10 Collection of liquids. The antenna shall be designed and constructed such that when mounted vertically either on the top or on the bottom surface of an aircraft structure no water or other liquids can collect in any portion of the
38、antenna that could ultimately result in failure or deterioration of performance of the antenna or rupture due to freezing. 3.3 Performance requirements. 3.3.1 Performance. The antenna shall be so designed that when mounted in the center of a large horizontal ground plane it shall provide vertically
39、polarized radiation of essentially uniform intensity over 360 degrees of azimuth. The antenna shall satisfy the performance requirements which are outlined in Section 4 when subjected to the following tests: a. Mechanical stress test b. Insulation test c. Radiation test d. Voltage standing save rati
40、o (VSWR) 3.4 Identification of product. 3.4.1 Nameplates and nomenclature. Nameplate and nomenclature approval and assignment shall be granted by acquiring activity only upon compliance with the applicable requirements of MIL-DTL-18307 and MIL-DTL-15024. 3.4.2 Use of AN or MIL designations. AN or MI
41、L designations shall not be applied to a product except for preproduction test samples, nor referred to in correspondence, sales material or otherwise, until notification has been received from acquiring activity, that the product has been approved. When the antenna is procured by a prime contractor
42、 through subcontract, purchase order, or otherwise (not including Government furnished) the prime contractor shall be responsible for compliance with the requirements of paragraph 3.4.1 and approval, when granted, will extend only to that one antenna source or to that one prime antenna contract. 3.5
43、 Pure tin. The use of pure tin, as an underplate or final finish, is prohibited both internally and externally. Tin content of antenna components and of solder shall not exceed 97 percent, by mass. Tin shall be alloyed with a minimum 3 percent lead, by mass (see 6.6) 3.6 Workmanship. All details of
44、workmanship shall be in accordance with the best manufacturing practice for high-quality electronic equipment. Particular attention shall be given to neatness and thoroughness in the making of parts, plating, soldering, and finishing. 4. VERIFICATION. 4.1 Classification of inspections. The inspectio
45、n requirements specified herein are classified as follows: a. Contractor tests. Contractor tests are those tests conducted by the contractor on an antenna to determine that the antenna complies to the best of his knowledge and belief with all applicable requirements. b. Preproduction tests. Preprodu
46、ction tests are conducted by the acquiring activity, after the award of the contract, on samples which are representative of the production antennas to determine that the antennas meet all the requirements of this specification. Provided by IHSNot for ResaleNo reproduction or networking permitted wi
47、thout license from IHS-,-,-MIL-DTL-7879E 5 c. Inspection tests. Inspection tests are those tests accomplished on the antennas submitted for acceptance under the contract. 4.2 Contractor tests. The contractor shall conduct tests on one or more sample antennas as necessary to determine that the design
48、 of the antennas as proposed by the contractor will meet the requirements of this specification. Contractor tests shall be conducted in accordance with the approved preproduction test procedure. The data obtained by the contractor in conducting these tests shall be included with the design data subm
49、itted with the preproduction test antennas. The acquiring activity shall be advised when tests are to be conducted so designated Government representatives may witness or supervise the test when desired. Portions of the preproduction tests which duplicate the contractor tests may be omitted with acquiring activity approval; however, tests may be repeated when deemed necessary. Contractors lacking laboratory facilitie
