1、AA-C-57LH rn 999997 OL559b7 T9L rn AA-571H September 20, 1993 SUPERSEDING AA-57 1G December 16, 1982 FEDERAL SPECIFICATION m, FOLDING This spscification is approved by the Conmissioner, Federal Supply Service, General Services Administration, for the use of all Federal agencies. 1. SCOPE 1.1 Scow. T
2、his specification covers the requirements for one type of aluninum frame folding cot (see 6.1 and 6.4). 2. APPLICABLE lmcmmws 2.1 Government documents. Unless otherwise specified, the following documents of the issue in effect on date of invitation for bids or request for proposal form a part of thi
3、s specification to the extent specified herein. O Federal Specification: A-A-203 - Paper, Kraft, Untreated Federal S-: FED-STD-123 - Marking for Shipnent (Civil Agencies) FED-STD-751 - Stitches, Seams and Stitchings (Activities outside the Federal Government my obtain copies of Federal specification
4、s, standards, and comnercial item descriptions as outlined under General Information in the Index of Federal Specifications, Standards and Beneficial cmnts (recomnendations, additions, deletions) and any pertinent data which may be used in improving this document should be addressed to: Center, Nati
5、ck, MA 01760-5017, by using the Standardization Document inprovernent Proposal (DD Form 1426) appearing at the end of this document or by letter. U.S. Army Natick Research, Developnent, and Engineering AMSC N/A FSC 7105 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited
6、. O Licensed by Information Handling ServicesAA-C-573H = 9999974 0355968 928 = AA-57 1H Cormiercial Item Descriptions. supplements as issued, is for sale on a subscription basis by the The Index, which includes cumulative bimonthly Superintendent of Documents, U.S. Government Printing Office; Washin
7、gton, Dc 20402. ) (Single copies of this specification, and other Federal specifications and cormiercial item descriptions required by activities outside the Federal Government for bidding purposes are available without charge fran General Services Administration Wisiness Service Centers in Boston,
8、MA; New York, NY; Philadelphia, PA; Washington, DC; Atlanta, GA; Chicago, IL; Kansas City, Ei1D; Fort Worth, TX; Houston, TX; Denver, (JO; San Francisco, CA; IAS Angeles, CA; and Seattle, WA.) (Federal Government activities may obtain copies of Federal standnrdi zation documente, standardc, and carn
9、iercial item descriptions, and the Index of Federal Specifications, fm established distribution points in their agencies.) Militarv Standards: MIL-STD-105 - Sampling Procedures and Tables for Inspection by Attributes MIL-SID-129 - Marking for Shipnt and Storage MIL-STD-147 - Palletized Unit Lnads (C
10、opies of Military specifications and standards required by contractors in connection with specific procurenient functions should be obtained fran the procruring activity or as directed by the contracting activity.) 2,1.2 Other Government doniments, drawinus, and publications. The following other Gov
11、ernment documents, drawings, and publications form a part of this document to the extent specified herein. Unless otherwise specified, the issues are those citai in the solicitation. DRAWINGS U.S. AFWY NATICK RESE“, DEWEZDPME“, AND ENGINEERING CEiVJXR 2-5-65 - Cot Folding; Methd of Folding for Shipn
12、ent 2-5-72 - Cot, Folding; Assembly Canplete (Copies of drawings are available from the U.S. Army Natick Research, Developrient, and Engineering Center, Al“: SAW-UXT, Natick, MA 01760-5017.) 2.2 Other publications. The following documents form a part of this specification to the extent specified her
13、ein. identified, the issue in effect on date of invitation for bids or request for proposal shall apply. Unless a specific issue is # 2 Licensed by Information Handling ServicesAA-C-573H 9999974 0355969 864 AA-C-57 lH American Society for Testincr and Materials (ZWMl B 633 - Electrodeposited Coating
14、s of Zinc on Iron and Steel D 3950 - Strapping, Plastic (and Seals) D 3951 - Standard Practice for Cmrcial Packaging D 3953 - Strapping, Flat Steel and Seals (Application for copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103-1187.)
15、 (Technical society and technical association specifications and standards are generally available for references from libraries. distributed amng technical groups and using Federal agencies.) They are also 2.3 Order of precedence. In the event of a conflict betmn the text of this document and the r
16、eferences cited herein, the text of this specification shaU take precedence. Nothing in this specification, however, shall supersede applicable laws and regulations unless a specific exqtion has been obtained. 3. REQUI- 3.1 First article. When specified (see 6.2) a sample shall be subjected to first
17、 article inspection (see 6.3) in accordance with 4.3. 3.2 Materials. Materials shall conform to the requirements specified herein and the subsidiary documents applicable thereto. definitely specified shall be of the quality normally used by the mufacturer for the frame and cover, provided the end it
18、em ccmplies with all provisions of this specification. It is encouraged that rxycled material be used when practical as long as it meets the requirements of this specification. Materials not 3.2.1 Haxiware, miscellaneous. Bolts, nuts and washers shall be steel, cmrcial quality, of the size and type
19、shown on the drawings. Rivets shall be Steel, cmrcial quality, semitubular or solid type, except the rivet used on the strap shall be brass of cormiercial quality, tubular, flathead, with brass cap. All steel miscellaneouc hardware shall have a corrosion- resisting plating in accordance with manufac
20、turers carniercial practice. rivets shall be of sufficient length to provide a mi- of 1/8 inch for peening or rolling, as applicable. Blind rivets shall be aluminum, cormier- cial type, 3/16-inch bociy, 5/8-inch head, break stem, large flange (see 6.6). The 3.3 Construction. The construction of the
21、cots shall conform in all respects to Drawing 2-5-72 and all subsidiary drawings pertaining thereto, and as specified herein. At the option of the contractor, covers shall be 3 Licensed by Information Handling ServicesAA-C-57LH 9999974 0355970 5136 , t AA-571H fabricated fran either cotton duck or f
22、ran nylon duck. The cots shall be capable of being assembled, disassembled and cmpctly folded as intended without causing damage to any ccmponent. 3.3.1 Stitches, seams and stitchinq. Stitching shall conform to stitch type 301 of FED-STD-751, with 8 to 10 stitches per inch. 3.3.1.1 Autanatic stitchi
23、nq. Autanatic stitching machines may be used to perform any of the required stitch patterns provided the requirements for the stitch pattern, stitches per inch, and size and type of thread are met; and at least three or more tying, overlapping or back stitches are used to secure the ends of stitchin
24、g. 3.3.1.2 TVw 301 stitchinq. Ends of all stitching shall be backstitched or overstitched not less than 1 inch except where ends are turned under or caught in other seams and stitching. Thread tensions shall be maintained so that there will be no loose stitching resulting in loose bobbin or top thre
25、ad or excessively tight stitching resulting in puckering of the materials sewn. The lock shall be imbedded in the materials seed. 3.3.1.2.1 Repairs of tvpe 301 stitchinq. Repairs of type 301 stitching shall be as foll: a. When thread breaks or bobbin run-outs occur during stitching, the stitching sh
26、all be repaired by restarting the stitching a minimum of one inch (1/2 inch for box-x stitching) back of the end of the stitching. I/ b. Thread breaks, or two or more consecutive skipped or run-off stitches noted duringinspection of the item (in-process or end item) shall be repaired by overstitchin
27、g. inch in back of the defxtive area (1/2 inch on box-x stitching), and continue over the defective area and continue a minimum of one inch (1/2 inch on box-x stitching) beyond the defective area onto the existing stitching. Inose or excessively tight stitching shall be repaired by removing the defe
28、ctive stitching, without aging the materials, and restitching in the required mer. A/ The stitching shall start a minimum of one - i/ When making the above repairs, the ends of the stitching are not required to be backstitched. 3.3.2 Settinu of rivet=. 3.3.2.1 Tubular rivets and cam. All rivets shal
29、l be securely and neatly set with a rivet cap and without causing damage to the wehbing. punched in the straps to receive blind rivets that attach the strap to the alurninum frame shall be smaller than the outside diamter of the rivet body so that the rivet naist be forced through the hole in the st
30、rap. Holes 4 Licensed by Information Handling ServicesAA-C-573H 9799974 0355973 412 AA-C-571H 3.3.2.2 Solid or tubular rivets without caps. Ail rivets shall be properly driven with heads flush against steel stampings. rivets shall be peened without burrs or sharp edges. rivets shall be firmly clinch
31、ed with even metal distribution. The ends of solid The ends of tubular 3.3.3 Steel stampinqs. The steel stampings (Ls, Ss and Ts) shall be securely riveted or bolted as shown on the applicable drawings and the flanges of the stampings shall be pressed down and fitted tightly against the adjacent par
32、ts. 3.3.4 Pluq, end. End plugs shall be riveted, pinned or cemented into the bottom of the legs and both ends of the end rails to prevent renioval. adhesive, when used, shall be such, as recmnded by the adhesive manufacturer for adherence of plastic to aluminum alloy. The 3.4 Finish. 3.4.1 Aluminum
33、alloy frame. Ends shall be cut clean and be free of sharp The rims of all holes shall be free of sharp or rough edges. or rough edges. 3.4.2 Platinq. All steel stampings (Ls, Ss and Ts) shall be zinc plated in accordance with type I, service condition 3 (SC3) of ASIM B 633. 3.5 Markinas for identifi
34、cation. 3.5.1 Frame and cover. The identification mking shall be as specified O on the applicable drawing. 3.6 Workmanchip. Cloth camponents shall be clean and free of holes, cuts, Thread tension tears, or cloth defects such as multiple floats or broken or missing yams. Webbing and tapes shall conta
35、in no frayed or scalloped edges. shall be maintained so that there will be no loose stitching and seam allmances shall be maintained with seams properly sewec so that no runoffs, twists, pleats or open seams shall result. Care shall be taken in sewing so that there shall be no needle chews. All thre
36、ad ends shall be trirmied to 1/4 inch or less. Blind rivets shall be securely and neatly set. canpnents shall be free of burrs, sharp edges and corroded areas, and shall not be broken, malformed, or dented. to the quality of product established by this specification and the occur- rence of defects s
37、hall not exceed the applicable acceptable quality levels. Metal The finished product shall also conform 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase order, the contractor is responsible for the performance of all inspection
38、 requir-ements (examinations and tests) as specified herein. 5 Licensed by Information Handling ServicesAA-C-57LH = 9999974 0355972 359 AA-C-571H Except as otherwise specified in the contract or purchase order, the contractor may use his own or any other facilities suitable for the perfor- mance of
39、the inspection requirements specified herein, unless disapproved by the Government. inspections set forth in this specification where such inspections are deemed necessary to ensure supplies and services conform to prescribed requirements. requirements of sections 3 and 5. specification shall becm a
40、 part of the contractors overall inspection system or quality program. specification shall not relieve the contractor of the responsibility of ensuring that all prcducts or supplies suhitted to the Gov-nt for acceptance comply with all requirements of the contract. inspection, as part of manufacturi
41、ng operations, is an acceptable practice to ascertain conformance to requirements, however, this does not authorize suhnission of known defective material, either indicated or actual, nor does it cdt the Government to accept defective material. The Government reserves the right to perform any of the
42、 4.1.1 Resmnsibilitv for ccmliance. All item shall meet all The inspection set forth in this The absence of any inspection requirements in the Sampling 4.1.2 Responsibility for dimensional requ irements. Unless othemise specified in the contract or purchase order, the contractor is responsible for e
43、nsuring that all specified dimensions have been met. when dimensions cannot be examined on the end item, inspection shall be made at any point, or at all points in the manufacturing process necessaxyto ensure compliance with all dimensional requirements. 4.2 Classification for inspections. The inspe
44、ction requirements specified herein are classified as follows: a. b. First article inspection (see 4.3). Quality conformance inspection (see 4.4). 4.3 First article inspection. when a first article is required (see 3.1 and 6.2), it shall be examined for the defects specified in 4.4.3 and 4.4.4. Any
45、nonconformance shall be cause for rejection of the first article. 4.4 pua litv conformance inspection. Unless otherwise specified, sampling for inspection shall be perfonried in accordance with MIL-sI13-105. 4.4.1 Component and material inspection. In accordance with 4.1, canpnents and materials sha
46、ll be subjected in accordance with all the requirements of referenced documents Unless otherwise excluded, amended, mdified, or qualified in this specification or applicable purchase document. 4.4.2 In-process inspection. Inspection shall be made to determine that the following are as specified: 6 L
47、icensed by Information Handling Servicesi AA-C-571H m 9999974 0155973 295 m AA-C-57 1H a. b. c. Holes punched to receive blind rivets (see 3.3.2.1). Setting of solid or tubular rivets (see 3.3.2.2). Setting of end plugs in bottan of legs and end rails of cots (see 3.3.4). Whenever nonconforniance is
48、 noted, correction shall be made to the item affected and the process. from production. Parts which cannot be corrected shall be rmved 4.4.3 End item visual examination. The end items shall be examined for The inspection level shall be II the defects listed in table I. cots. and the acceptable quali
49、ty level (AQL), expressed in terms of defects per hundred units, shall be 6.5 for major defects and 15 for total (major and minor canbined) defects. The lot size shall be expressed in units of The sample unit shall be one cot. TABLE I. End item visual defects Examine Defect Classification Major Minor Fabric Any hole, except drill holes, cut, or tear Woken or missing yarn, or open place clearly visible at nom1 inspection distance (approximately 3 feet) Shade bar Tape and webbings Not firmly and tightly woven; edges Multiple f hats Any cut, hole, tear, or smash Abrasion mark, s
