1、MIL-B-444 18 (a) 28 June 1991 MILITARY SPECIFICATION Bo(Tr wAL;L, FABRIC ASSEMELIES, STANDARDIZED ImEmATED CmMAND F)sr SYSTEM (SIBS) This specification is approved for use by the Natick Research, Developnent, and Engineering Center, Department of the Anrty, and is available for use by all Department
2、s and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers five types of bootwalls. 1.2 Classification. The boot wall shall be of the following types and classes as specified (see 6.2). Type1 - SIBS, M577 Tracked Cannand Post Boot Wall Type II - SIBS, Rigid Wall Shelt
3、er (W) Boot Wall Type III - SIBS, M1037, S250/G Boot Wall Type IV - SIBS, M1037, S250E Boot Wall Typev - SIBS, M998, M1038 Troop - Cargo Carrier Boot Wall Class 1 - Green Class 2 - Desert tan 2. APPLICABLE IxnmEms 2.1 Govenmient do. F -. *. - , 2. -_ .s I. *. 3 Provided by IHSNot for ResaleNo reprod
4、uction or networking permitted without license from IHS-,-,-3.2.1 Alternate conpsonents. Components offered as equivalent to components specified hereinafter and on the referenced drawings as a specific manufacturers part or model number or equal, shall be functionally equal to the manufacturers mod
5、el number identified, and of equal or better quality. The incorporation and inclusion of such a component in the design of the specified end product shall not require modification or change to any other specified component, and shall not reduce ease of maintenance to it or any other components, unle
6、ss such modification or change is specially approved by the contracting officer. if none is required, prior to comnencing production, the contractor shall suhnit for the contracting officers approval, a list identifying each component, together with proof that each listed component carplies with req
7、uirements specified above. require a sample of the proposed substitution. Approval of the subitteci listing, together with the necessary supporting data, authorizes carmiencement of manufacture but does not relieve the contractor of responsibility that these components perform in accordance with spe
8、cified requirements when incorporated into the end product. Prior to the manufacture of the first article, or The contracting officer, at his option, my 3.3 Desiqn and construction. 3.3.1 Boot Wall tm. 3.3.1.1 Type I. The design and construction for the type I boot wall shall conform to Drawing 5-4-
9、7484 and all subsidiary drawings and parts lists and as specified herein. 3.3.1.2 Type II. The design and construction for the type II boot wall shall conform to Drawing 5-4-8183 and all subsidiary drawings and parts lists and as specified herein. 3.3.1.3 Type III. The design and construction for th
10、e type III boot wall shall conform to Drawing 5-4-7409 and all subsidiary drawings and parts lists and as specified herein. 3.3.1.4 Type IV. The design and construction for the typ N boot wall shall conform to Drawing 5-4-8213 and all subsidiary drawings and parts lists and as specified herein. 3.3.
11、1.5 TVpe V. The design and construction for the type V boot wall shall conform to Drawing 5-4-8456 and all Subsidiary drawings and parts lists and as specified herein. 3.3.2 Fusinu of ends of synthetic cord, minu and tam. All ends of synthetic cord, webbing and tape shall be fused. the cord, webbing
12、, and tape ends shall be capable of providing sufficient heat to provide a smooth edge with the cut ends of the cord, webbing and tape yarns all fused together. acccmplished prior to being asstabled for stitching. The apparatus used to fuse Fusing of the cord, wewing and tape shall be 4 Provided by
13、IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- I MIL-B-44418 83 9999906 0472843 4 I MIL-B-44418 (a) i 3.3.3 Stitchinu, machine. 3.3.3.1 Type s of stitchinq. All stitch types, except bartacking, shall conform to FED-SIP751 as follows: For all stitching except -
14、 Type 301, 5 to 7 stitches per inch zig-zag stitching and stitching indicated by “ZV1 on drawings For stitching indicated - Type 401, 5 to 7 stitches per inch - Chain portion of stitching shall not appear on by “Z“ on drawings outside of tent or cover For bartacking - Bartack, length as specified on
15、 drawings 1/8 inch in width (bight) and shall be free of thread breaks and loose-stitching 3.3.3.2 Wead breaks. Thread breaks in stitching shall be overstitched not less than 1 inch at each break on stitch type 301; and not less than 1-1/2 inches at each break on stitch type 401. shall be overstitch
16、ed with stitch type 301. inspection shall be repaired by overstitching the existing stitching starting from a distance of 1 inch beyond the break, across the defective area, to a distance of 1 inch beyorid the break. required to be backstitched. Thread breaks, in type 401 Thread breaks noted during
17、The ends of repair stitching are not 3.3.3.3 Stitchinu ends. The ends of type 301 stitching shall be overstitched not less than 1 inch except where ends are turned under in a han or held dawn by other stitching. autkiatically on stitch patterns such as box, box with cross-stitch, “W1 stitching or st
18、raight line tacking, at least three tying, overlapping, or back stitches shall be used to secure the ends of stitching. 3.3.3.4 skim stitches. TM or more consecutively skipped stitches occurring in types 301 stitching shall be overstitched not less than 1 inch. Any skipped stitches in type 401 stitc
19、hing shall be overstitched not less than 1-1/2 inches. Skipped stitches in 401 stitching shall be overstitched with type 301 stitching. Skipped stitches noted during inspection shall be repaired as specified for thread breaks. (See 3.3.3.2). Where 301 stitching is performed 3.3.3.5 Wrication of thre
20、ad. The addition of any lubrication to the polyester sewing thread prior to or during the sewing operations is prohibited. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MI-B-444 18 (GL) 3.3.3.6 Automatic stitching. Autanatic stitching mchines may
21、 be used to perfom any of the required stitch pattern provided the requirements of the stitch pattern, stitches per inch, size and typ of thread are met, and at least three or more tying, overlapping or backstitches are used to secure the ends of the stitching. 3.3.3.7 Thread ends. All thread ends t
22、hat are visible on the finished item shall be trhned to a length of not mre than 1/2 inch. 3.3.3.8 Stitchina marq ins. unless otherwise specified, all stitch margins shall be 1/8 inch +1/16 -0 inch. 3.3.4 Eblicinq of cloth. There shall be no splicing of fabric. The number of panel seams shall not ex
23、ceed the requirements specified on the applicable drawings. 3.3.5 Settinq of qrwmie ts. smaller than the outside-diamter of the gromnet barrel so that the barrel must be forced through the hole. without cutting the materials. water through the stitching on the boot wall assemblies when they are test
24、ed as specified in 4.5.1. thread has been utilized and that no lubrication has been added to the polyester thread prior to or during the sewing operation. as a result of failure of the cup test and when authorized by the contracting officer, shall be performed by treating me exposed stitching on the
25、 wall assembly with seam sealant specified in 3.3.7. the boot walls shall be treat4 with Keriyon Corkuner FYaiucts K-Kote Seam Sealer-J (clear) #83-234C or equal (see 6.4): The requikements for infrared reflection does not apply to seam sealant. The fabric surface shall be cleaned so that it is free
26、 of dirt and moisture prior to application of seam sealant. cover an are 1/2- inch wide on each side and on top of all stitching. There shall be no mog:than a 10-inl leakage af water through the seam when tested Holes punched to receive the gromiiets shall be The gromnets shall be secureiy clinched
27、3.3.6 Wickinq of sewinq thread (cup test). There shall be no wicking of The cup test is intended to insure that non-wicking Repairs required 3.3.7 Leakaqe of sealed searris, All exposed stitching on the exterior of Sealant shall be applied with a brush or roller, and swll evenly ed in4.5.2. -. 3.3.8
28、 Seam strenqth. 3.3.9 %mirs to boot walls. The strength of the seams shall be 80 percent of the fabric strength when tested as specified in 4.5.3. No mre thanone repair to holes, cuts, tears or burn through resulting from the heat sealing operation shall“ be allowed. inch in diameter or length shall
29、 be performed as follows: -A . , Repairs on holes, cuts, tears or burn through not more than one f t Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-B-444L8 83 I 9499906 0492845 8 E MIL-B-444 18 (a) a. Repairs shall be accmplished by the applica
30、tion of cemented patches. Cemented patches shall be large enough to overlap the damaged area with a margin of at least 3/4 inch on all-sides, using cement per Minnesota Mining and Manufacturing 847 or equal (see 6.5). b. For repairs of bsini-through on panel lap seanis, the width of the patch shall
31、be such that the overlap on each side of the kmn-through shall be equal to the width of the seam. c. Patches shall be applied to the top side of the assemblies and the patched area shall be SpILoOth, i .e., with the torn or cut edged smly and canpletely sealed and corners shall have a radius. 3.4 Ma
32、rkind. Ml markings and labels shall confonnto DDD-L-O. 3.4.1 E Except as otherwise specified in the-contract or -hase order, the . - -* .- The Governmnt reserves the right to perfonn any of the 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-4.1.1
33、Responsibility for compliance. All item shall met all requirements of section 3 and 5. specification shall -om a part of the contractors overall inspection system or quality program. specification shall not relieve the contractor of the responsibility of ensuring that all products or supplies sutmit
34、ted to the Cbvernwnt for acceptance comply with all requirements of the contractr inspection, as part of manufacturing operations, is an acceptable practice to ascertain confonnance to requirement;s, hariirever, this does not authorize sutmission of laiawn defective material, either iradicateci or a
35、ctual, nor does it cdt the Government to accept defective material. The inspection set forth in tkis The absence of any insmion requirements in the Sampling 4.1.2 Responsibilitv for dimensional recm iremeritS. Unless otherwise specified in the contract or purchase order, the contractor is responsibl
36、e for ensuring that all specified dimensions have been met. When dimencions cannot be examined on the end item, inspection shall be made at any pint or at all points in the manufacturing process necessary to ensure ampliance with all dimensional requiranents. 4.2 Classification of inswions. The insm
37、ion requirements specified herein are classified as follaws: a. b. First article inspection (see 4.3) Quality conformance inspection (see 4.4) 4.3 First article insmxtion. 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 and shall
38、be tested as specified in 4.4.5. any test shall be cause for rejection of-the first article. for inspection shall be performed in acconiance with MIL-SiD-105. Any nonconformance or failure of 4.4 pua litv conformance inseion. Unless othemise specified, sanpling 4.4.1 CarOJo nent and material inspect
39、ion. In accordance with 4.1, cmnents and materials shall be inspected in accordairice with all the requirements of referenced d0cUment;s unless otherwise excluded, amended, modified, or qualified in this specification or applicable purchase do=urrurnt. 4.4.2 In-mmcess examination. Examination shall
40、be made of the follawing “here shall be no lubrication of polyester thread prior to or during fabrication operations to establish conformance with specified requiremen ts. a. the sewing operations for canpliance with 3.3.3.5. b. Holes punched to receive grannets are in cqliance with 3.3.5, 8 Provide
41、d by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NIL-B-44418 83 O 9999906 0492847 1 0 - , MIL-B-44418(GL) c. Heat sealing operation shall be monitored. A sample seam specimen of sufficient size to conduct testing in accordance with 3.3.7 shall be produced ea
42、ch time the heat sealing equipnent is started and every 300 linear feet of sealed seam there after. Whenever nonconformance is noted, correction shall be made to the items affected and to the process. affected shall be removed from the process. When correction cannot be made the item 4.4.3 End item
43、visual examinatin. The end item units shall be examined for the defects listed in table I. of bootwalls. shall be II. defects per hundred units, shall be 4.0 for major defects and 10 for major and minor A combined and 40 for total (major, minor A and minor B combined) defects. The lot size shall be
44、expressed in units The sample unit shall be one boot wall. The inspection level The acceptable quality level (AQL), expressed in tem of. TABLE I. End item visual defects Classification Examine Defect Major Minor AB Tape, webbing, i.e., cutting cloth: Insecurely clinched; i.e., gramnets or washers be
45、cane disengaged: Gramet set with baniel inserted from top of webbing instead of bottom Roll of a gramet contains more than three scores (splits) Any cut or break: - on eave guy line - eye splice omitted Eye splice not as specified Free end not finished as specified Open seam on stitch type 301: - fo
46、r mre than 1/4 inch but not mre than 1 inch - for mm than 1 inch A seam shall be classified as open when one or mre stitches joining a seam are broken, or when one or mre skipped or run-off stitches occur, On double stitched seams, a seam shall be classified as open when either one or both sides of
47、a seam are open. 10 304 105 305 205 106 107 306 307 206 207 308 309 310 208 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-B-44418 83 W 9999906 0492849 5 IL1 MIL-B-44418 (a) h TABLE I. End item visual defects (contd) Classification e Examine De
48、fect Major Minor Seams and stitching (contd) NOTE: IWIE: Heat sealed seams Box stitching Bartacking Fabric edges caught in stitching: - more than 1 inch but not more than 3 inches - more than 3 inches Thread breaks: - overstitched less than 1-1/2 inches on stitch type 401 - overstitched less than 1
49、inch on stitch type 301 Thread breaks not overstitched shall be classified as opn seams. Needle chews resulting in cut, tear or hole (see cut, tear or hole) Skipped stitches: - overstitched less than 1-1/2 inches on stitch type 401 - overstitched less than 1 inch on stitch type 301 (when two or more skipped stitches occur consecutively) Skipped stitches not overstitched shall be classified as open
