1、_SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising theref
2、rom, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2010 SAE International All rights reserved. No part of this publication ma
3、y be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-4970 (outside US
4、A) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/AS7974AAEROSPACESTANDARDAS7974 REV. A Issued 1998-01 Revised 2010-12Superseding AS7974 (R) Cabl
5、e Assemblies and Attachable Plugs, External Electrical Power, Aircraft,General Specification For RATIONALECompletely revised to remove government jargon, update specification references, align specification with sae ae-8 guidelines, incorporate amendment, and review for minor technical problems. 1.
6、SCOPE 1.1 Scope This specification applies to complete cable assemblies (using either molded on or attachable plugs) used to connect external electric power to aircraft and to attachable plugs used as replacement for plugs damaged in service. 1.2 Classification Each cable assembly or attachable plug
7、 (hereinafter referred to as item) shall be identified by the part number listed on the applicable detail specification sheet. The products under this specification shall be one of the following types: a. Attachable connector plugs: Molded rubber connector plugs with mechanically attachable crimp co
8、ntacts or splices. b. Cable assemblies: Assemblies consisting of integrally molded or attachable connector plugs (when specified) and other termination devices attached to single jacketed or banded cables 1.3 Air Force Applications 1.3.1 Integrally Molded Plugs for Original Equipment Cable assemblie
9、s that are procured for air force original equipment applications shall only be integrally molded cable assemblies. 1.3.2 Attachable Plugs for Replacement Air Force use of attachable plugs shall be limited to replacement of plugs damaged in service. Copyright SAE International Provided by IHS under
10、license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AS7974A Page 2 of 352. APPLICABLE DOCUMENTS The following publications form a part of this document to the extent specified herein. The latest issue of SAE publications shall apply. The applicable
11、issue of the other publications shall be the issue in effect on the date of the purchase order. In the event of conflict between the text of this document and references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regula
12、tions unless a specific exemption has been obtained. 2.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org.AMS-R-81828 Rubber, Chlorosulfonated Polyethylene Elasto
13、mer, Sheet and Molded Shapes, Ozone Resistant AS5756 Cable and Wire, Power, Electric, Portable AS7974/1 Connector, Plug, Aircraft External Power AS7974/2 Cable Assembly, External Power, Aircraft 115/200 Volt, 400 Hertz Power Distribution Flight Line (for A/E 24A-166A) AS7974/3 Connector, Plug, Attac
14、hable, External Electric Power, Aircraft, Single-Jacketed Cable Assemblies, 115/200 Volt, 400 Hertz AS7974/4 Cable Assembly, External Electric Power, Aircraft, Single-Jacketed 115/200 Volt, 400 Hertz AS7974/5 Cable Assembly, External Power, Aircraft 270 Volt, 400 Hertz, 90 KW Power Distribution Flig
15、ht Line AS81790 Connectors, Receptacle, External Electric Power, Aircraft AS20659 Terminal, Lug, Crimp Style, Copper, Uninsulated, Ring Tongue, Type I, Class 1 AS21378 Plugs and Cable Assemblies, External Power, Aircraft 230/400 Volt, 400 Hertz AMS-DTL-23053 Insulation Sleeving, Electrical, Heat Shr
16、inkable, General Specification For AS 24121 Wiring Harness, Single Point Refueling AS24122 Wiring Harness, External Power, 115 Volt AC, Single Phase AS24208 Cable and Plug Assembly, External Power, 115/200 Volts, 3 Phase, Single Point Refueling AS25019 Cable Assembly-Jet Starting Power AS25486 Conne
17、ctor, Plug, Attachable, external Electric Power, Aircraft, 115/200 Volt, 400 Hertz AS25487 Connector, Plug, Attachable External Electric Power, Aircraft 28 Volt DC, Jet Starting AS25488 Connector Plug, Attachable, External Power, Aircraft, 28 Volt DC Operating Power AS90328 Cable Assembly, External
18、Electric Power, Aircraft, 115/200 Volt, 400 Hertz AS90347 Cable Assembly, External Electric Power, Aircraft, 28 Volt DC Operating Power AS90362 Connector, Receptacle, External Power, Aircraft, 115/200 Volt, 400 Hertz Copyright SAE International Provided by IHS under license with SAENot for ResaleNo
19、reproduction or networking permitted without license from IHS-,-,-SAE AS7974A Page 3 of 352.2 ASTM Publications Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org.ASTM D 1149 Rubber Deterioration-Surface Ozone Cr
20、acking in a Chamber ASTM D 5118 Standard Practice for Fabrication of Fiberboard Shipping Boxes ASTM D 1630-83 Standard Test Method for Rubber Property-Abrasion Resistance (NBS Abrader) ASTM D 1974 Standard Method for Closing, Sealing, and Reinforcing Fiberboard Shipping Containers 2.3 ASQ Publicatio
21、ns Available from American Society for Quality, 600 North Plankinton Avenue, Milwaukee, WI 53203, Tel: 800-248-1946 (United States or Canada) or +1-414-272-8575 (International), www.asq.org.ASQC Z1.4 Sampling Procedures and Tables for Inspection by Attributes 2.4 National Conference Of Standards Lab
22、oratories (NCSL) Publications National Conference of Standards Laboratories, 2995 Wilderness Place, Suite 107, Boulder, CO 80301-5404, Tel: 303-440-3339, www.ncsli.org.NCSL Z540-1 General Requirements for Calibration Laboratories and Measuring and Test Equipment 2.5 U.S. Government Publications Avai
23、lable from the Document Automation and Production Service (DAPS), Building 4/D, 700 Robbins Avenue, Philadelphia, PA 19111-5094, Tel: 215-697-6257, http:/assist.daps.dla.mil/quicksearch/.A-A-3174 Plastic Sheet, Polyolefin A-A-1898 Cushioning Material, Cellulosic, Packaging MIL-STD-5624 Turbine Fuel,
24、 Aviation, Grades JP-4 and JP-5 MIL-DTL-83133 Turbine Fuels, Aviation, Kerosene Types, NATO F-34(JP-8), NATO F-35, and JP-8 + 100 MIL-STD-202 Test Methods for Electronic and Electrical Component PartsMIL-PFR-6855 Rubber, Synthetic, Sheets, Strips, Molded or Extruded Shapes, General Specification for
25、 MIL-STD-2073- 1 Standard Practice for Military Packaging. MIL-PRF-23699 Lubricating Oil, Aircraft Turbine Engines, Synthetic Base MIL-STD-129 Military Marking for Shipment and Storage MIL-STD-130 Identification Marking of U.S. Military Property SD-6 Provisions Governing Qualification Copyright SAE
26、International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AS7974A Page 4 of 352.6 Order of Precedence In the event of a conflict between the text of this document and the references cited herein (except for related asso
27、ciated detail specifications,) 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 Specification Sheets The individual item requirements shall be as specified here
28、in and in accordance with the applicable specification sheets. In the event of any conflict between requirements of this specification and the specification sheets, the latter shall govern. 3.2 Qualification (see 4.7 and 7.4): Products furnished under the specification shall be products that are qua
29、lified for listing in the applicable qualified products list (QPL) at the time set for the opening of government bids or commercial purchase orders. 3.3 Cable Assembly Materials (see 5.1.1) 3.3.1 Plug Materials The plugs shall be fabricated from chlorosulfonated polyethylene rubber conforming to AMS
30、-R-81828, or synthetic rubber conforming to MIL-PFR-6855, Class 2, Grade 60. The plug body material shall have an abrasion resistance index of at least 75 percent of the Standard reference compound when tested in accordance with ASTM D 1630-83. The depth of the abrasion shall be specified in Table 1
31、. Equivalent materials shall be approved by the qualifying activity and shall meet the test requirements of this specification. TABLE 1 - DEPTH OF REQUIRED ABRASION RESISTANCE Part of plug Min. thickness (inches) Front end 0.100 Widest side-within one inch of front end 0.15 Remainder of sides 0.100
32、3.3.2 Socket Contact Materials The small socket contacts shall be tellurium copper, leaded copper, or brass, with a minimum of 0.0002 inch of silver plate. The large socket contacts shall be tellurium copper or leaded copper or equal with a minimum of 0.0002 inch of silver plate. The conductivity of
33、 the alloys used for the large socket contacts shall be a minimum of 90 percent of the International Annealed Copper Standard (IACS). 3.3.3 Band Material The bands shall be of a nonmetallic material having an abrasion resistance index of at least 75 percent of the Standard reference compound when te
34、sted in accordance with ASTM D 1630-83. 3.3.4 Wire and Cable MaterialThe wire and cable used in the cable assemblies shall be an ozone-resistant material that is qualified under AS5756. 3.4 Cable Assemblies Design and Construction (see 3.1 and 5.1.2) Unless otherwise specified, cable assemblies and
35、plugs shall be design and constructed as follows: Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AS7974A Page 5 of 353.4.1 Dimensions Physical dimensions shall be as specified on the applicable
36、detail specification and herein (see 3.1). 3.4.1.1 Banding Location Bundled cable shall be banded at intervals not to exceed 24 inches.3.4.1.2 Wire and Cable The cable insulation shall be continuous between plug body and termination lugs with a maximum separation between insulation and lug barrel of
37、 1/4 inch. Additionally, a minimum length of 2 inches of properly sized shrinkable insulation sleeve in accordance with AMS-DTL-23053 shall be installed to symmetrically cover the insulation gap.3.4.1.3 Plug Socket Location No part of any socket, nor any part which is electrically connected to any s
38、ocket, shall be within 0.100 inch of the front end of the plug. Each large socket shall be in contact with its mating pin when the end of the pin has been inserted into the plug 0.500 inch from the surface of the front end of the plug. 3.4.2 Stripping Insulation When wires are stripped, for cables c
39、omposed of less than or equal to 100 strands, not more than one strand shall be nicked or cut through. For all cables composed of more than 100 strands, no more than 1 percent of the strands shall be nicked or cut through when stripping the conductor insulation. 3.4.3 Terminals Lug terminals shall c
40、onform to AS20659, or as specified on the applicable detail specification, and shall be crimped with the proper dies listed on AS20659 or equivalent as approved by the qualifying activity (see 6.4). Terminals and wire shall be free of foreign material. Soldered joints is not be permitted. 3.4.4 Cabl
41、e Assembly Plugs As required by the cable assembly part number (see 3.1), the cable assembly plug may be either molded to, or mechanically attached to, the cable bundle. 3.4.5 Attachable Plugs An attachable plug shall be attachable to any cable conforming to the requirements detailed on the applicab
42、le standard for that plug. The plug shall be attachable by the use of commercial standard tools. Socket contacts shall be provided with crimp type barrel ends with diameters as specified on the applicable SAE standard (see 3.1). When attached, the cable and new plug shall meet all applicable require
43、ments of this specification. 3.4.6 Structural Integrity (see 5.1.3) Each plug shall be so constructed that if the widest sides of the plug within 1 inch of the original front end are ground away to a depth of 0.125 inch, no part of the plug will fail or become loose and the plug will meet all the pe
44、rformance requirements of this specification. 3.4.7 Identification Marking3.4.7.1 Cable Assemblies with Control Leads Color Cable assemblies that utilize control leads shall have contact E crimped to the white colored lead wire and contact F crimped to the black colored lead wire. Copyright SAE Inte
45、rnational Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AS7974A Page 6 of 353.4.7.2 Socket Identification Socket identification shall be clearly and durably marked adjacent to each socket on the side or end as shown on th
46、e applicable detail specification sheet. 3.4.7.3 Cable Lug Terminal Identification The lug terminal identification shown on the detail specification sheet shall be clearly and durably marked on both sides of sleeve which shall be shrunk or cemented onto the insulation of the wire within 6 inches of
47、the lug terminal. Each wire shall be electrically connected to the corresponding marked plug socket. Control leads, when specified, shall be from 2 to 6 inches longer than the power leads. 3.4.7.4 Cable Assemblies Marking Location Marking of cable assemblies shall be on a band or sleeve around all w
48、ires and located between any two clamping bands except the three nearest to the plug and the three nearest to the terminals. 3.4.7.5 Attachable Plugs Marking (Type and Location) Marking of attachable plugs shall be 3/16 inch minimum block style depressed characters located on the wide face of the plug body. Marking shall be readable when the cable entry end of the plug is facing downward. 3.4.7.6 Item Package Identification (see 6.) Each item shall be marked as follows for identification in accordance with MIL-STD-130: AS Part NumberManufacturers Part Number Manufacturers Name or Trademar
