1、 Comments, suggestions, or questions on this document should be addressed to Natick Soldier Center, ATTN: AMSRD-NSC-AD-AD, J. Riley, Natick, MA 01760-5017 or emailed to john.rileynatick.army.mil Since contact information can change, you may want to verify the currency of this address information usi
2、ng the ASSIST Online database at http:/assist.daps.dla.mil AMSC N/A FSC 1670 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. MIL-DTL-43649D(GL) 25 April 2005 SUPERSEDING MIL-DTL-43649C(GL) 25 June 1997 DETAIL SPECIFICATION PARACHUTES, CARGO, 12, 26, AND 34 FOOT DIAM
3、ETER This specification is approved for use by the Natick Soldier Center, Department of the Army, and is available for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers the requirements for three cargo parachute assemblies and the separat
4、e components thereof. 1.2 Classification. 1.2.1 Size. The cargo parachutes consist of the following sizes as specified (see 6.2). Size - 12-foot diameter Size - 26-foot diameter Size - 34-foot diameter 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are cited in sections 3,
5、 4 and 5 of this specification. This section does not include documents cited 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 a
6、ll specified requirements documents cited in sections 3, 4, and 5 of this specification, whether or not they are listed. INCH-POUND Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-43649D(GL) 2 2.2 Government documents. 2.2.1 Specifications an
7、d standards. The following specifications and standards form a part of this document to the extent herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract FEDERAL SPECIFICATIONS V-T-295 - Thread, Nylon (Copies of these documents are available
8、 online at http:/assist.daps.dla.mil/quicksearch/ or www.dodssp.daps.mil or from the standardization order desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094) 2.2.2 Drawings. The following other Government drawings form a part of this document to the extent specified herein. Unless o
9、therwise specified, the issues are those cited in the solicitation or contract. DRAWINGS NATICK SOLDIER CENTER 11-1-216 - Parachute, Cargo, Ringslot, 12 Ft. Diameter 11-1-217 - Canopy Assembly; 12 Ft. Dia. Ringslot Cargo Parachute 11-1-218 - Deployment Bag; 12 Ft. Diameter Cargo Parachute 11-1-219 -
10、 Static Line; Cargo Parachute 11-1-507 - Canopy Details 11-1-508 - Riser; Cargo Parachute 11-1-509 - Panels, Canopy 11-1-555 - Parachute, Cargo, Ringslot, 26 Ft. Diameter 11-1-556 - Canopy Assembly; 26 Ft. Diameter Ringslot Cargo Parachute 11-1-557 - Canopy Details 11-1-558 - Canopy Sections 11-1-55
11、9 - Riser; Cargo Parachute 11-1-560 - Panels, Canopy 11-1-578 - Parachute, Cargo, 34 Ft. Nominal Diameter, Cotton, Bi-Conical, Annular Ring, 500 Lb Capacity 11-1-579 - Canopy Assembly; 34 Ft. Diameter Bi-Conical, G-14 Cargo Parachute 11-1-580 - Canopy Details and Sections 11-1-581 - Riser, 34 Ft. Di
12、ameter Bi-conical Cargo Parachute 11-1-3954 - Deployment Bag Assembly; 26 Ft. HV Parachute 11-1-3955 - Body Assembly 11-1-3956 - Flap, Assembly 11-1-3960 - Loop Assembly 51D6553 - Pack, Cargo Parachute Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
13、MIL-DTL-43649D(GL) 3 61D2459 - Drogue, Parachute Static Line (Copies of these documents are available from the Natick Soldier Center, ATTN: AMSRD-NSC-AD-AD CONFIGURATION MANAGER, Natick, MA 01760-5017.) 2.3 Non-Government publications. The following documents form a part of this document to the exte
14、nt specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation. AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM ASTM D 737 - Test Method for Air Permeability of Textile Fabrics ASTM D 6193 - Standard Practice for Stitches and Seams (Copies of thes
15、e documents are available from the American Society for Testing and Materials, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.) 2.4 Order of precedence. In the event of a conflict between the text of this document and the references cited herein (except for related associated specifications
16、 or specification sheets), 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 First article. When specified (see 6.2), a sample shall be subjected to a first arti
17、cle inspection in accordance with 4.2. 3.2 Materials. Materials shall conform to the requirements of the applicable Technical Data Package (TDP), to subsidiary specifications and standards applicable thereto and as specified herein. 3.2.1 Recycled, recovered, or environmentally preferable materials.
18、 Recycled, recovered, or environmentally preferable materials should be used to the maximum extent possible provided that the material meets or exceeds the operational requirements , and promotes economically advantageous life cycle costs. 3.3 Construction. Details of construction shall be in accord
19、ance with the TDP and the additional requirements as specified herein. 3.3.1 Stitching. All stitching shall be in accordance with ASTM D 6193. Broken threads, skipped and missing stitches occurring in type 301 or 401 stitching shall be overstitched not less than 1 inch past the ends of the defect. B
20、roken threads and skipped stitches occurring in type 308 stitching shall be overstitched not less than three stitches past the ends of the defect. Except where otherwise specified, ends of all type 301 or 401 stitching shall be backstitched not less than inch, unless ends are turned under in a hem o
21、r held down by other stitching. Thread tensions shall be maintained so that loose stitching does not occur and the lock will be imbedded Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-43649D(GL) 4 in the materials sewed. Thread ends shall be
22、 trimmed throughout. Runoffs shall be restitched to conform to the specified stitch pattern. 3.3.1.1 Stitching, automatic machinery. Automatic sewing machines may be used for sewing stitch patterns provided that the size of the pattern, the thread size, and the number of stitches per inch specified
23、in the detail specification are maintained. A minimum of three tie-in, overlapping or back stitches shall be used to secure the ends. 3.3.1.2 Darns. Holes, cuts, or tears in the canopy, deployment bag or pack cloths shall be darned with thread, types I, II or III, class A, size A, color Camouflage G
24、reen 483 of V-T-295. Damaged areas of the cloth which can be darned shall not exceed inch in diameter for holes (except drill holes) and inch in length for cuts or tears in any direction. Fourteen darns are allowed per canopy, four per deployment bag, and four per pack. 3.3.2 Canopy Permeability. Th
25、e air permeability of the cloth of the completed canopy shall not exceed the specified lower limit by more than 10 percent nor the specified upper limit by more than 10 percent when tested in accordance with 4.6.1. 3.3.3 Canopy patching. One sewn patch is allowed per canopy. The maximum damaged area
26、 that can be patched is an area 7 inches by 7 inches. The patch shall be located no closer than 1 inch from a radial seam, edge reinforcement, or lower lateral band. The patch shall be square or rectangular in shape and conform to the patching procedure in 3.3.4. 3.3.4 Patching procedure. a. Place t
27、he repairable item on a repair table, smooth the fabric around the damaged area, and secure the item to the table with pushpins. Do not pin the damaged area. b. Using an authorized marking aid of contrasting color, mark a square or rectangle around the area to be patched and insure that one side of
28、the marked square or rectangle is parallel to the warp or filling of the fabric. c. Cut the damaged area fabric along the lines made in (b) above. Further cut the fabric diagonally at each corner to allow a inch foldback in the raw edges. d. Make a inch foldback on each raw edge. Pin and baste each
29、foldback to complete the prepared hole. e. Using the same type material as in the original construction, mark and cut a patch 2-1/2 inches wider and longer than the inside measurements of the prepared hole. Insure that the patch material is marked and cut along the warp or filling of the fabric. f.
30、Center the patch material over the prepared hole and insure the warp or filling of the patch material matches the warp or filling of the fabric being patched. Pin the patched material in position. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-D
31、TL-43649D(GL) 5 g. Make a inch fold under on each edge of the patch material and baste the patch to the prepared area. h. Remove the pushpins securing the item to the repair table and secure the patch by machine stitching, using the applicable details in figure 1. The stitching should be accomplishe
32、d with thread that is contrasting in color to the fabric. Thread shall be V-T-295, size E nylon, types I, II or III, class A. The stitching shall be type 301, using 7 to 11 stitches per inch in accordance with ASTM D 6193. Backstitch ends of stitching inch minimum or overlap the ends of stitching 2
33、inches minimum or 4 inches maximum. 3.4 Workmanship. The workmanship shall conform to the quality of product established by this specification. 4. VERIFICATION 4.1 Classification of Inspections. The inspection requirements specified herein are classified as follows: a. First article inspection (see
34、4.2). b. Conformance inspection (see 4.3). 4.2 First article inspection. First article inspection shall be performed on one complete parachute assembly, when a first article sample is specified (see 3.1). This inspection shall include the tests and examinations of 4.3.1, 4.3.2, 4.4, 4.5 and 4.6. Any
35、 defect or nonconformance shall be cause for rejection of the first article. 4.3 Conformance inspection. Conformance inspections shall include the examinations of 4.3.1, 4.3.2, 4.4., 4.5 and 4.6. Sampling plans and acceptance/rejection criteria for 4.4, 4.5 and 4.6 shall be as specified in the contr
36、act or purchase order. Parachute assemblies which fail the acceptance criteria shall be cause for rejection of the lot. 4.3.1 Component and material inspection. Components and materials shall be inspected in accordance with all of the requirements of referenced documents unless otherwise excluded, a
37、mended, modified, or qualified in this specification or applicable purchase document. 4.3.2 In-process inspection. Inspection of subassemblies shall be made to ascertain that construction details and dimensional requirements, which cannot be examined in the finished product, are in accordance with s
38、pecified requirements. The Government reserves the right to exclude from consideration of acceptance any material or service for which in-process inspection has indicated nonconformance. 4.4 End item visual examination. The end items shall be examined for the defects listed in the applicable tables
39、of 1 thru V. Any nonconformance to the TDP shall be classified as a defect. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-43649D(GL) 6 TABLE I. Canopy Visual Defects Classification Defect Major Minor Cloth, webbing and tape: Any hole in clo
40、th (except drill holes): inch diameter or less 201 More than inch diameter 101 Color not as specified 202 Not specified type or class 102 Cut or tear in cloth: y inch or less 203 More than y inch 103 Smash 104 Multiple floats 105 Grease or oil stain over sq. inch 106 Grease or oil stain(s) less than
41、 y sq. inch area: Not more than 5 per gore or 15 per canopy 204 More than 5 per gore or 15 per canopy 107 Embedded crease or wrinkle in excess of y inch width 108 Darns, over 14 per canopy 109 Patches: More than one per canopy 110 Patch size exceeding 7 inches by 7 inches 111 Location not as specifi
42、ed 112 Shape not as specified 113 Procedure, not as specified in 3.3.4 114 Cord and thread: Not specified type or size as applicable 115 Color not as specified 205 Vent Construction: Vent reinforcement overlap, does not span two main seams 116 Vent reinforcement band, improper assembly 117 Provided
43、by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-43649D(GL) 7 TABLE I. Canopy Visual Defects (Contd) Classification Defect Major Minor Vent line length (across vent) not as specified: Less than inch 206 inch or more 118 Twisted vent line: More than 360
44、 207 More than 360, causing kinks in line 119 Gore width at vent, measured C/L to C/L on adjacent radial seams, not as specified: Less than inch 208 inch or more 120 Slot width, not as specified: Less than inch 209 inch or more 121 Skirt reinforcement band improperly assembled 122 Under fold (raw ed
45、ge) skirt hem 123 NOTE: When a raw edge is the result of over folding the edge extending more than y inch but less than 1 inch, the raw edge may be trimmed and will not be scored as a defect. If the condition extends more than 1 inch from the inside edge of the skirt hem, the stitching will be remov
46、ed and the hem refolded and restitched. Tucks, wherein section of gore fabric is caught in stitching of hem 124 Suspension lines crossed 125 Cut, frayed, or damaged suspension or vent lines 126 Suspension line length, not as specified: Less than inch 210 inch or more 127 Provided by IHSNot for Resal
47、eNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-43649D(GL) 8 TABLE I. Canopy Visual Defects (Contd) Classification Defect Major Minor Suspension line twisted: More than 360 211 More than 360, causing kinks 128 Stitches and stitching: Wrong type 129 Two or more stitches
48、per inch less than specified 130 Two or more stitches per inch more than specified 212 Broken, skipped or missing stitches not overstitched as specified 131 Open seam 132 NOTE: A seam shall be classified as open when one or more stitches joining a seam are broken or where two or more skipped stitche
49、s occur. Repairs of open seams will not be scored as defects. Stitches and stitching (contd): Wrong type seam 133 Missing or incomplete stitch pattern 134 Runoff not restitched in accordance with specified pattern 213 Zigzag stitching not sewn through suspension lines 135 Tension loose, resulting in loose top or bobbin thread, or tight tension, resulting in tightness or puckeri
