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 there
2、from, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2017 SAE International All rights reserved. No part of this p
3、ublication may 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
4、 (outside USA)Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/standards.sae.org/AS5944 AEROSPACESTANDARDAS5944 Issued 1999-04 Reaffirmed 2017-11 Slings, Aircraft, General Specif
5、ication For FSC 1730 RATIONALE AS5944 has been reaffirmed to comply with the SAE Five-Year Review policy. NOTICEThis document has been taken directly from U.S. Military Specification MIL-S-5944C and contains only minor editorial and format changes required to bring it into conformance with the publi
6、shing requirements of SAE technical standards. The initial release of this document is intended to replace MIL-S-5944C. Any part numbers established by the original specification remain unchanged.The original Military Specification was adopted as an SAE standard under the provisions of the SAE Techn
7、ical Standards Board (TSB) Rules and Regulations (TSB 001) pertaining to accelerated adoption of government specifications and standards. TSB rules provide for (a) the publication of portions of unrevised government specifications and standards without consensus voting at the SAE Committee level, an
8、d (b) the use of the existing government specification or standard format.Under Department of Defense policies and procedures, any qualification requirements and associated qualified products lists are mandatory for DOD contracts. Any requirement relating to qualified products lists (QPLs) has not b
9、een adopted by SAE and is not part of this SAE technical document.1. SCOPE:1.1 Scope:This specification covers the general requirements for aircraft slings used to lift and transport aircraft or aircraft components which may be bulky or fragile.1.2 Classification:The aircraft slings shall be classif
10、ied in Table I as follows;TABLE I. Classification of aircraft slings2. APPLICABLE DOCUMENTS:2.1 Government documents:2.1.1 Specifications, standards, and handbooks: The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise sp
11、ecified, the issues of these documents are those listed in the issue of the Department of Defense Index of Specifications and Standards (DODISS) and supplement thereto, cited in the solicitation (see 6.2).SPECIFICATIONSFEDERALV-T-295 Thread, NylonRR-C-271 Chains and Attachments, Welded and WeldlessR
12、R-W-410 Wire Rope and StrandCCC-C-419 Cloth Duck, Cotton, Unbleached, Plied-Yarns, Army and NumberedPPP-B-636 Box, Shipping, FiberboardSAE INTERNATIONAL AS5944 Page 2 of 30_ 2.1.1 (Continued):MILITARYMIL-P-116 Preservation, Methods ofMIL-W-4088 Webbing, Textile, Woven NylonMIL-W-5665 Webbing, Textil
13、e, Cotton WarpMIL-H-6875 Heat Treatment of Steels, Process forMIL-T-8879 Screw Threads, Controlled Radius Root with increased minor Diameter, General Specification forMIL-C-18375 Wire Rope, Flexible, Corrosion-resisting Nonmagnetic for Aircraft ControlMIL-W-27265 Webbing, Textile, Woven Nylon Impreg
14、natedMIL-M-46032 Fungus Resistant Treatment for Sandbags; Copper ProcessesMIL-W-83420 Wire Rope, Flexible For Aircraft ControlSTANDARDSFEDERALFED-STD-H28 Screw-Thread Standards for Federal ServicesFED-STD-595 ColorFED-STD-751 Stitches, Seams and StitchingsMILITARYDOD-STD-100 Engineering Drawing Prac
15、ticesMIL-STD-109 Quality Assurance Terms and DefinitionsMIL-STD-129 Marking for Shipment and StorageMIL-STD-130 Identification Marking of U.S. Military PropertyMIL-STD-209 Slinging and Tie Down Provisions for Lifting and Tying Down Military EquipmentMIL-STD-808 Finish, Protective and Codes for Finis
16、hing Schemes for Ground and Ground Support EquipmentMIL-STD-810 Environmental Test Methods and Engineering GuidelinesMIL-STD-831 Test Reports, Preparation ofMIL-STD-970 Standards and Specifications, Order of Preference for, the selection ofMIL-STD-1189 Standard Department of Defense Bar Code Symbolo
17、gyMIL-STD-1190 Minimum Guidelines for Level C Preservation, Packing, and MarkingMIL-STD-1367 Packaging, Handling, Storage and Transportability Program Requirements for Systems and EquipmentsMIL-STD-2073-2 Packaging Requirements CodesDOD-STD-2101 Classification of CharacteristicsMIL-STD-2175 Castings
18、, Classification and Inspection ofMIL-STD-2219 Fusion welding for aerospace applicationsSAE INTERNATIONAL AS5944 Page 3 of 30_ 2.1.1 (Continued):MILITARY HANDBOOKSMIL-HDBK-300 Technical Information File of Support Equipment(Unless otherwise indicated, copies of federal and military specifications, s
19、tandards, and handbooks are available from the Standardization Documents Order Desk, Building 4D, 700 Robbins Avenue, Philadelphia, PA 19111-50942.1.2 Other government drawings: The following other Government drawings form a part of this document to the extent specified herein. Unless otherwise spec
20、ified, the issues are those cited in the solicitation.Air Force Drawings7545352 Requirements for Finishes, Protective, and Codes for San Antonio ALC Ground and Ground Support EquipmentNaval Air Systems Command Drawings4SE000726 Test/Inspection Certification Tag(Copies of drawings required by manufac
21、turers in connection with specific acquisition functions should be obtained from the contracting activity or as directed by the contracting officer.)2.2 Non-government publications:The following document(s) form a part of this document to the extent specified herein. Unless otherwise specified, the
22、issues of the documents which are DoD adopted are those listed in the issue of the DODISS cited in the solicitation. Unless otherwise specified, the issues of documents not listed in the DODISS are the issues of the documents cited in the solicitation (see 6.2).AMERICAN SOCIETY FOR TESTING AND MATER
23、IALS (ASTM)ASTM E 8 Tension testing of metallic material(Application for copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103-1137)(Non government standards and other publications are normally available from the organizations which pr
24、epare or which distribute the documents. These documents also may be available in or through libraries or other informational services.)SAE INTERNATIONAL AS5944 Page 4 of 30_ 2.3 Order of Precedence:In the event of a conflict between the text of this document and the references cited herein the text
25、 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 First article:When specified (see 6.4), a sample shall be subjected to first article inspection in accordance with 4.4.3
26、.2 Standardization of slings:Before a new sling is designed it shall be mandatory that MIL-HDBK-300 be reviewed to verify that an existing sling cannot be used.3.3 Selection of specification and standards:Specifications and standards for necessary commodities and services not specified herein shall
27、be selected in accordance with MIL-STD-970.3.4 Protective treatment for sling materials:Materials used in the construction of the slings shall be protected against deterioration when exposed to climatic and environmental conditions likely to occur during service. This protection against deterioratio
28、n shall be accomplished in a manner which will not prevent compliance with the performance requirements of this specification. Protective coatings that will crack, chip, or scale with age or extremes of climatic and environmental conditions shall not be used. All fabric and webbing used in the sling
29、s shall be treated in accordance with MIL-M-46032. Finishes and protective coatings on all metal surfaces of the slings shall be in accordance with MIL-STD-808 and for USAF slings Drawing 7545352.3.5 Standard steels:Steels complying with ASTM, AMS, Military, Federal or AISI standards shall be utiliz
30、ed in the design and fabrication of the slings and shall be corrosion resistant or treated to resist corrosion due to fuels, salt spray, or atmospheric conditions likely to be encountered during storage or normal service.3.5.1 Heat treatment: Heat treatment of steel materials shall be in accordance
31、with MIL-H-6875.SAE INTERNATIONAL AS5944 Page 5 of 30_ 3.5.2 Welding: Welding shall be accomplished and inspected in accordance with MIL-STD-2219 and shall only be accomplished by operators who are presently qualified.3.5.3 Castings: When used, castings shall be designed and classified in accordance
32、 with the requirements of MIL-STD-2175.3.5.4 Screw threads: Screw threads and threaded fasteners shall meet applicable requirements ofFED-STD-H28 except those threads that are designed for a critical application. These threads and “safety” critical threads shall be in accordance with MIL-T-8879.3.5.
33、5 Standard parts: Standard parts (MS, AN, or NAS) shall be used wherever they are suitable for the purpose, and shall be identified on the drawing by their part numbers. Commercial utility parts such as screws, bolts, nuts, cotter pins, et cetera, may be used provided they possess suitable propertie
34、s and are replaceable by the standard parts (MS, AN, or NAS) without alteration, and provided the corresponding standard part numbers are referenced in the parts list as acceptable alternates and, if practicable, on the contractors drawings. In the event there is no suitable corresponding standard p
35、art in effect on date of invitation for bids, commercial parts may be used provided they conform to all requirements of this specification.3.6 Fabric webbing:All fabric type materials used in the slings structure shall conform to CCC-C-419. All webbing straps used shall conform to MIL-W-5665 or MIL-
36、W-4088. The fabric or webbing shall be constructed to prevent undue fraying of the edges and at attachment points. All ends or termination of nylon thread or webbing shall be secured by heat-searing.3.6.1 Fabric threads: The threads used in the termination or assembly of the webbing shall be nylon t
37、hread in accordance with V-T-295 which is the preferred material. The thread size and class shall be determined by the design requirements.3.7 Part numbering of interchangeable parts:All parts having the same manufacturers part number shall be functionally and dimensionally interchangeable. The item
38、 identification and part number requirements of DOD-STD-100 shall govern the manufacturers part numbers and changes thereto.3.8 Design and construction:The slings shall be designed to support the specified aircraft or component part being hoisted and shall not interfere with or contact the part bein
39、g hoisted at areas other than points of attachment. Unless otherwise specified, the design shall include a provision of adjustment for varying center of gravity locations of the hoisted items for improved stability during hoisting and limited transportation. The dimensions of slings shall be kept to
40、 a minimum consistent with design requirements. For aircraft hoisting slings, the maximum vertical height of the sling hoist attachment shall not exceed 24 feet or as otherwise specified when the aircraft is hoisted just clear of the ground with gears down.SAE INTERNATIONAL AS5944 Page 6 of 30_ 3.8.
41、1 Rated load: The rated load shall be the maximum load for which the slings are designed to handle. The term rated load or capacity is the same as the Safe Working Load (SWL). Those terms or loads shall not include the factor of safety and are the loads or forces applied under actual working conditi
42、ons. The rated load is the maximum permissible applied load.3.8.2 Design requirements: The design of the slings shall eliminate all unnecessary weight and shall reflect a constant effort toward weight-strength optimization. The stress level, under load condition, at any point in the structure shall
43、be limited to a level that provides a safety factor of 3 against permanent deformation. When dynamic factors induce loads that exceed 1.5 times the rated load, the stress level at any point in the structure shall be limited to a level that provides a safety factor of 2 against permanent deformation
44、induced by dynamic loads. Bolts, rivets, pins and all other attachment devices shall be designed to include a safety factor of 5 based on ultimate strength. The design of steel cables and fabric straps shall include a safety factor of 5 based on the breaking strength of the cable or strap. The sling
45、 assembly shall be capable of withstanding a static proof load of 200 percent of the rated load. In addition, fabric straps or webbing designed for use as bellyband slings shall be of sufficient width and softness to provide an even distribution of the load to the straps to prevent the straps from d
46、amaging the thin skinned surfaces. For those slings used for transporting cargo below a helicopter the frontal area of this cargo shall be calculated in accordance with Appendix A of MIL-STD-209. The maximum shipping weight and sling length shall also be calculated in accordance with MIL-STD-209.3.8
47、.3 Safety: The slings shall be so constructed and assembled as to withstand all conditions of service use without loss or loosening of parts, permanent deformation or loss of serviceability. The slings shall be designed to provide for servicing and use by personnel wearing heavy gloves, mittens, bulky clothing and chemical defense ensembles. Hazards that cannot be eliminated or controlled through design selection shall be controlled to an acceptable level through use of fixed, automatic, or other protective safety design features or devices. A proof
