1、= 770b 1784383 137 1 INCH-POUND I MIL-DTL-44033B 21 April 1995 SUPERSEDING MIL-L-44033A 25 October 1984 DETAIL SPECIFICATION LINES, MULTI-LOOP, CONCENTRIC This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification cover
2、s one type of concentric multi-loop lines fabricated of webbing and intended for use in airdrop operations. 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are needed to meet the requirements specified in sections 3, 4, and 5 of this specification. This section does not inc
3、lude documents 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 meet all requirements documents cited in sections 3, 4, and 5 of this
4、 specification, whether or not they are listed. Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be used in improving this document should be addressed to: U.S. Army Natick Research, Development, Engineering Center, Attn: SSCNC-UC, Natick, MA 01760-5017 by
5、 using the Standardization Document Improvement Proposal (DD form 1426) appearing at the end of this document or by letter. AMSC N/A FSC 1670 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without
6、 license from IHS-,-,-m 999990b 1984384 073 1 MIL-DTL-4 4 O 3 3B 2.2 Government documents, drawinss, and mblications. The following Government documents, drawings, and publications form a part of this document to the extent specified herein. Unless otherwise specified, the issues are those cited in
7、the solicitation. DRAWINGS U.S. ARMY NATICK RESEARCH, DEVELOPMENT, AND ENGINEERING CENTER 11-1-3164- Riser Extension Assembly 68F217- Line Multi Loop, Concentric Loop Type, Assembly of (Copies of drawings are available from the U.S. Army Natick Research, Development, and Engineering Center, Attn: SA
8、TNC-MI, Natick, MA, 01760-5017.) 2.3 Non-Government rmblications. The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of the documents which are DoD adopted are those listed in the issue of the DODISS cited in the solicitation.
9、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 MATERIALS (ASTM) ASTM D 3951 - Standard Practice for Commercial Packaging (Application for copies should be addressed to t
10、he American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103-1187.) 2.4 Order of precedence. In the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, superse
11、des applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 First Article. When specified (see 6.2), a sample shall be subjected to first article inspection in accordance with 4.2. 3.2 Samples. The color shade of webbing specified on the drawings shall matc
12、h the standard shade sample (see 6.3). 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-44033B 3.3 Materials. The materials used in the manufacture of the lines shall conform in all aspects to the requirements specified on the drawings and p
13、arts lists pertaining thereto, and as specified herein. Recovered materials shall be used to the maximum extent possible. 3.4 Construction. Construction shall conform to all aspects of the requirements specified on the drawings and as specified herein. Repairs to defective stitching shall be as spec
14、ified herein. Other repairs or rework shall not be performed on the lines. 3.4.1 Webbincr relaxation. All webbing used in the fabrication of loops shall be relaxed for a minimum of 48 hours prior to measuring for cutting. Relaxation of the webbing shall be accomplished by loosening the coiled rings
15、so there is a minimum of 1/4 inch space between the webbing coils of the roll. 3.4.2 Dimensions. Finished lengths and the number of loops for the lines shall be as specified in the contract (see 6.2). The cut length of the individual loops, after relaxation of the webbing rolls (see 3.4.1) and prior
16、 to splicing, shall be determined by the contractor and shall result in the finished length shown on the drawings. 3.4.3 Machine stitchinq. Ends of stitching shall be back stitched not less than 1/2 inch. Thread tension shall be maintained so there will be no loose stitching and the locks shall be e
17、mbedded into the materials sewn. All thread ends shall be trimmed so that they do not exceed 1/4 inch. 3.4.3.1 Automatic Stitchinq. Automatic sewing machines may be used to perform any of the stitch patterns provided the requirements for the stitch pattern, stitches per inch, size and type of thread
18、 are met; and at no less than two tying, overlapping or backstitches are used to secure the ends of the stitching. 3.4.3.2 Loose stitches. Looses stitches shall not be removed but shall be reinforced by adjacent stitching. 3.4.3.3 Tisht stitches. Tight stitches which occur on the sliding keeper only
19、 shall be removed and the section shall be restitched. 3.4.3.4 Repairs of the 301 stitchinq. Repairs of type 301 stitching shall be as follows: 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-44033B a. When thread breaks, skipped stitches,
20、run-Offs, or bobbin runouts occur during sewing, the stitching shall be repaired by adjacent stitching with the stitches extending a minimum of 1 inch beyond the ends of the stitches being repaired. When making the above repairs, the ends of stitching are not required to be backstitched. b. Thread b
21、reaks, or two or more consecutive skipped or run- off stitches noted during inspection of the item (in-process or end item) shall be repaired by adjacent stitching. The stitching shall start a minimum of 1 inch in back of the defective area, and continue a minimum of 1 inch beyond the ends of the st
22、itching being repaired. When making the above repairs, the ends of stitching are not required to be backstitched. 3.5 Identification markinq. Using the marking medium specified on the drawing, all marking shall be of characters 1/2 inches in height. Markings shall be located near each end of the lin
23、e of one side, and shall be placed so that they will not be obscured by the keepers. No marking shall appear on splices or keepers. Identification shall be as follows: a. US b. Part No. c. Finished length for P/N of Drawing 68F217 only d. Date of manufacture e. Manufacturers name or code 3.6 Workman
24、ship. Concentric lines shall be uniform in quality and shall be free from irregularities or defects that could adversely affect performance or durability. 4. VERIFICATION 4.1 Classification of inspections. The inspection requirements specified herein are classified as follows: a. First article inspe
25、ction (see 4.2). b. Conformance inspection (see 4.3). 4.2 First article inspection. First article inspection shall be performed on one complete concentric line assembly when a first article sample is required (see 3.1). This inspection shall include the examinations of 4.4, 4.5 and 4.6. 4.3 Conforma
26、nce inspection. Conformance inspection shall include the examinations of 4.5 and 4.6. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-44033B 4.4 Examination. Each concentric line assembly shall be examined for compliance with the requiremen
27、ts specified in 3.2 though 3.5. This element of inspection shall encompass all visual examinations (see 4.5) and dimensional measurements (see 4.6). of one or more defects preventing or lessening maximum efficiency shall constitute cause for rejection of the lot. Noncompliance with any specified req
28、uirements or presence 4.5 End item visual examination. The end items shall be examined for the defects listed in Table I. any specified requirement shall constitute a defect. Noncompliance with TABLE I. End item visual examination Examine Defect Classification major minor Webbing Not specified type
29、or class 101 Color not as specified 201 seamed as specified 202 Ends not wax dipped or Hole, tear, or cut in material 102 Abrasion resulting in rupture of yarns, or in nap sufficient to obscure the identity of any yarns exceeding 10 percent of width or 1 inch in length 103 or torn 104 Edge frayed, b
30、eaded, corded, Two broken warp or fill yarns 203 More than two broken warp or fill yarns 105 Open Seams 1/2 inch or less More than 1/2 inch 204 106 Note: A seam shall be classified as open when one or more stitches joining a seam are broken or when two or more consecutive skipped or runoff stitches
31、occur. Run-of f (See Open Seams) Stitch type Wrong stitch type 107 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-44033B TABLE I. End item visual examination (contd) Examine Defect Classification major minor Stitch tension Loose resulting
32、in loose top or bobbin thread 205 puckering of webbing (applicable to sliding keepers only) 206 Excessively tight resulting in Stitches per inch One stitch per inch more than More than one stitch per inch One stitch per inch less than More than one stitch per inch maximum specified 207 more than max
33、imum specified 108 minimum specified less than minimum specified 109 208 NOTE: Variation in the number of stitches per inch caused by the operator speeding up machine to sew over heavy places, shall be classified as follows: (a) Within the major defect classification minor defect (b) Within the mino
34、r defect classification - no defect Thread breaks, Not adjacent stitched as specified 209 skipped stitches, or runoffs NOTE: Thread breaks or two or more consecutive skipped or runoff stitches not adjacent stitched classified as open seams. Ends of stitching Not secured as specified Rows of stitchin
35、g Any row of stitching missing, except on 72 continuous lines and six point stitch patterns stitching one row more or less than specified On 72 continuous lines of shall be 210 110 111 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-c MIL-DTL-44033
36、B TABLE I. End item visual examination (contd) Examine Defect Classification major minor On six point stitch pattern, more or less than one row specified per individual stitch pattern 112 Components and Assembly Sliding Keeper Fixed Keeper Splices Buff er Any component part omitted or not as specifi
37、ed or required operation omitted (unless otherwise classified herein) 113 Any component misplaced or not assembled as specified 114 Needle chew Any darn, splice or other unauthorized repair 115 211 Not specified size or type 116 Sliding keeper not completely Stitch pattern on overlap of dipped in me
38、lted wax mixture 2 12 keepers not in location shown on Drawing 68F217 in relation to top or bottom loops 213 omitted 117 One or both sliding keepers Not specified size or type 118 Not assembled as specified 2 14 One or more fixed keepers omitted 119 Not spaced alternately as Not joined parallel as M
39、ore than two splices per specified 215 specified 120 loop 121 Not specified size or type 122 Not assembled as specified 216 One or both buffers omitted 123 Not longitudinally stitched to loop 124 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- - 9
40、99990b 1984390 377 i MIL-DTL-44033B TABLE I. End item visual examination (contd) Examine Defect Classification major minor Cleanness Dirt, grease, oil or foreign matter clearly noticeable 217 Identification Missing, incomplete, not legible, marking improper location or size 218 Wrong color 219 4.6 E
41、nd item dimensional examination. The end items shall be examined for conformance to the dimensions specified on the drawings. Only those dimensions that can be evaluated without damaging or disassembling the end items shall be examined. Any dimension not within the specified tolerance shall be class
42、ified as a defect. 5. PACKAGING 5.1 Preservation and packinq. Packaging requirements shall be as specified in the contract or order (see 6.2). 5.2 Markinq. Unless otherwise specified (see 6.2), marking shall be in accordance with ASTM D 3951. 6. NOTES (This section contains information of a general
43、or explanatory nature that may be helpful, but is not mandatory.) 6.1 Intended use. The items are intended for use in the rigging, extraction and delivery of cargo and equipment from military aircraft in flight. 6.2 Acquisition requirements. Acquisition documents should specify the following: a. Tit
44、le, number, and date of this specification. b. Issue of DODISS to be cited in the solicitation, and if required, the specific issue of individual documents referenced (see 2.2) . c. Stock number. d. When a first article is required (see 3.1). e. Finished length and number of loops (3.4.2). 8 Provide
45、d by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-44033B 6.3 Sample. For access to government furnished property (see 3.2) address the contracting activity issuing the invitation for bids or request for proposal. 6.4 International standardization asre
46、ement. Design provisions of this document are the subject of international standardization agreements NATO STANAG No.3469 (Edition No. 2) and ASCC AIR STD 44/153. When amendment, revision, or cancellation of this document is proposed which will affect or violate the international agreement concerned
47、, the preparing activity will take appropriate reconciliation action though international standardization channels including Departmental Standardization Offices, if required. 6.5 Subject term (kev word) listinq. Air delivery Parachute Extraction Rigging 6.6 Chanses from previous issue. Marginal not
48、ations are not used in this revision to identify changes with respect to the previous issue due to the extensiveness of the changes. Custodians: Army - GL Navy - AS Air Force - 99 Preparing activity: Army - GL (Project 1670-0825) Review activities: Army - AV Navy - MC Air Force - 82 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
