1、 Beneficial comments (recommendations, additions, deletions) and any pertinent data that may be of use in improving this document should be addres sed to: Natick Soldier Center ATTN: AMSSB - RAD - AD(N), Natick, MA 01760 - 5017, using the Standardization Document Improvement Proposal (DD Form 1426)
2、appearing at the end of this document or by letter. AMSC N/A FSC 1670 DISTRIBUTION STATEMENT A. Approve d for public release; distribution is unlimited. INCH - POUND MIL - DTL - 7567C 30 OCTOBER 2002 SUPERSEDING MIL - P - 7567B 28 March 1985 DETAIL SPECIFICATION PARACHUTES, PERSONNEL, DETAIL MANUFAC
3、TURING INSTRUCTIONS FOR This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers detail instructions relative to the dimensions, tolerances, repair procedures and other specific manufacturing instructions to be
4、 used in the assembly of personnel parachutes. The personnel parac hutes covered include the chest, seat, back, troop, training, rescue, integrated, maneuverable, and special purpose. 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are cited in sections 3 and 4 of this spec
5、ification. These lists do 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 these lists, document users are cautioned that they must meet all specified requireme
6、nts documents cited in sections 3 and 4 of this specification, whether or not they are listed. 2.2 Government documents. 2.2.1 Specifications and standards. The following specifications and standards form a part of this doc ument to the extent herein. Unless otherwise specified, the issues of these
7、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). S PECIFICATIONS DEPARTMENT OF DEFENS E Provided by IHSNot for ResaleNo reproduction or networking permitted without license
8、 from IHS-,-,-MIL - DTL - 7567C 2 MIL - DTL - 6645 - Parachutes, Personnel, General Specification for STANDARDS DEPARTMENT OF DEFENS E MIL - STD - 849 - Inspection Requirements, Definitions and Classification of Defects in Parachutes 2.3 Non - Government p ublications. The following documents form a
9、 part of this document to the extent specified herein. Unless otherwise specified, the issues of the documents that 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 th
10、e documents cited in the solicitation. AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) ASTM D 6193 Standard Practice for Stitches and Seams (Application for co pies should be addressed to the American Society for Testing and Materials, 100 Barr Harbor Drive, West Conshohocken, PA 19428 - 2959.) 2.
11、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 or specification sheets), the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and r
12、egulations unless a specific exemption has been obtained. 3. REQUIREMEN TS 3.1 First article. When specified, a sample shall be subjected to a first article inspection in accordance with 4.2. 3.2 Materials. Materials shall conform to the requirements of the applicable Technical Data Package (TDP) as
13、 specified in the proc urements documents. 3.3. Construction. Details of construction shall be in accordance with the applicable TDP and the additional requirements specified herein (see 3.4, 3.5 and 3.6). In the event of a conflict between construction details specified in the TDP and this specific
14、ation, the TDP shall govern. 3.3.1 Stitches and tolerances. 3.3.1.1 Stitching. Stitching shall conform to ASTM D 6193. Unless otherwise specified in the applicable TDP, the number of stitches per inch shall be as specified in Table I for the stitch type indicated. Table I. Thread size and stitches p
15、er inch Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL - DTL - 7567C 3 Thread Size Stitches per inch Zig Zag (Single Throw) type 304 Zig Zag (Single Throw) Type 308 B 7 to 11 12 to 16 8 to 12 E 7 to 11 12 to 14 7 to 10 F 7 to 11 12 to 14 7 to 10
16、 FF 6 to 9 - - 3 5 to 8 - - 5 4 to 6 - - 6 4 to 6 - - 3.3.1.2 Tolerances. Dimension tolerances, unless specifically called out differently in the TDP, shall be in accordance with Table II. Table II. Tolerances Dimension (inches) 1 / Tolerance ( + ) 1/16 1/32 in. More than 1/16 but less than 2 1/16 i
17、n. 2 or more, but less than 10 1/8 in. 10 or more, but less than 30 1/4 in. 30 or more, but less than 60 3/8 in. 60 or more 1/2 in. 1 / Tolerances are not cumulative. 3.4 Canopy. The canopy consists of the drag producing surface, suspension lines and connector links. The provisions specified in the
18、following subparagraphs also apply to the pilot chutes and drag (drogue) parachutes. 3.4.1 Cloth defects. The acceptability of cl oth used in the manufacture of the canopy shall be governed by the pertinent cloth specification unless waived by the procuring activity. During the spreading, cutting an
19、d manufacturing process, components having material defects or damages that are class ified as defects in the applicable cloth specification shall be removed from production and replaced with non - defective components. Cloth damage during seam ripping shall be cause for total rejection of the damag
20、ed section. No imperfection that requires darning shall be allowed in a gore before seam joining. 3.4.1.1 Canopy damage during construction. The maximum number of darns permitted in the main drag producing surface shall not exceed three darns per canopy, and one darn per gore, unless otherwise speci
21、fied. The maximum number of darns permitted for the drag producing surface of a pilot and drag (drogue) parachute shall not exceed one per canopy. Darns are not allowed for stretch fabric panels. Damaged or stretch fabric panels must be patched or replaced. 3.4.2 Dimensions after cutting. The dimens
22、ions of the gore sections after cutting will not be required to duplicate the measurements in the applicable TDP because the latter dimensions are intended for the pattern only. Variation in the finis hed width of cloth due to humidity or Provided by IHSNot for ResaleNo reproduction or networking pe
23、rmitted without license from IHS-,-,-MIL - DTL - 7567C 4 relaxation of tension after cutting and variation of measurement from the top to the bottom of the lay after cutting shall be recognized. 3.4.3 Seams and hems. Unless otherwise specified herein, tight gores, poorly folded seams resulting in ra
24、gged edges, cloth edges not caught in stitching, doubling over of cloth on the inside of the seam, and pleats in folding of seams shall not be permitted. The cross seam may contain sewing, folding, or material defects not detri mental to strength when the defects occur for a distance not to exceed 1
25、 inch from the ends of the seam after the main gore seam is formed. Seams and hems shall comply with MIL - STD - 849. They shall be flat and smooth and no exposed raw edges of the canopy cloth shall be permitted. 3.4.3.1 Pleating. Pleating of cloth at the vent or skirt hems in excess of 1/8 inch mea
26、sured along the inside edge of the hem and one pleat per gore shall be removed and repaired. For this purpose, a pleat shall be considered to be a fold in the cloth, caught by the inside row of stitching extending into the uppermost section. Pleats and tucks shall not be permitted in the main or the
27、 cross seams. 3.4.3.2 Overfolds and underfolds (main seam). Underfolds in the main seams ( four needle seams) shall be caught with three rows of stitching by at least 1/16 inch. The main seam overfolds shall not extend into the center channel, except that seams caught with only two rows of stitching
28、 1 inch from the inside of the top and the bot tom hems or within 1 inches above and below the centerline of the end of the cross seams as it crosses the third row of stitching inside the main seam will be acceptable. 3.4.3.3 Skirt hem. In forming the skirt hem of the canopy, not more than two pie c
29、es of webbing shall be used. If two pieces are used, the length of the shorter piece shall be sufficient to cross at least four gores, and the splice stitch pattern shall be the same as that which normally joins a single piece of webbing for this particu lar application. 3.4.3.4 Suspension lines. Su
30、spension lines crossing the vent shall be in proper rotation order and twisting of a line at the vent opening which kinks when relaxed shall not be acceptable. A maximum twist of 180 degrees will be permitte d in the suspension line between the skirt and the intermediate zigzag stitching above. The
31、twist shall be determined by pulling the suspension line while approximately 5 pounds of tension are applied between the vent and the suspension - line reinforcement at the skirt and while holding the suspension - line reinforcement and observing for rotation of the intermediate zigzag stitching. Th
32、e variation in length of the longest and the shortest vent line of the parachute shall not exceed inch. The distance fr om the top of the vent hem to the bottom of the skirt hem of the longest and the shortest suspension lines of the parachute, measured after installation and under 5 pounds of tensi
33、on, shall not vary more than 2 inches. The distance from the skirt hem to t he connector links of the longest and the shortest suspension lines of the parachute, measured after installation and under 5 pounds of tension, shall not vary more than 2 inches. 3.4.3.4.1 Threading. In threading the suspen
34、sion line or the reinforcin g webbing through the main seams, the threading needle shall be started with two layers of cloth above and two layers of cloth below the needle. Normal care shall be exercised to minimize deviation of the threading Provided by IHSNot for ResaleNo reproduction or networkin
35、g permitted without license from IHS-,-,-MIL - DTL - 7567C 5 needle from the middle position of the c loth layers in canopies fabricated from nylon cloth that is heavier than 1.1 ounces or canopies utilizing two - needle main - seam construction. In canopies fabricated from nylon cloth that is 1.1 o
36、unces or lighter, and not of the two - needle main -construction , the suspension line shall be positioned in the center of the four layers of cloth, and suspension lines threaded out of position shall be removed and properly rethreaded. 3.4.3.4.2 Protruding core ends. Core ends protruding through t
37、he outer casing sl eeve and carrier ends protruding from the surface of coreless line as a result of manufacturing overlaps shall be trimmed flush with the surface of the casing with the cord in a relaxed condition. 3.4.3.5 Replacement of vent and suspension lines. No mor e than 2 continuous suspens
38、ion lines nor more than 4 individual vent or suspension lines may be replaced per canopy. With the exception of vent and suspension line replacement, no more than 4 stitch formations per canopy, which includes the connector link s, may be completely removed and replaced. 3.4.4 Stitching. The stitchi
39、ng shall lie smoothly on the cloth without looping. The tension of bobbin and needle thread shall be equal. The thread lock of stitching in the main the cross seams shall lie close to the surface of the cloth. (All other sewing performed on hems and suspension lines is through material of sufficient
40、 thickness so that the thread lock will lie below the surface.) Multiple - needle machines shall be adjusted to provide the same tension from each needle. Basting thread, if used, need not be removed, providing that size B or lighter nylon thread is used and that the thread is concealed within the h
41、em or seam. The basting thread shall not restrict the channel of the main seam. 3.4.5 St itching defects and repairs. A stitching repair shall be considered to be all the overlapping and the stitching required to correct stitching that is not in accordance with applicable drawings. 3.4.5.1 Improper
42、tension. Stitching with improper tension, that is, too tight or too loose, shall be removed and replaced, as specified in 3.4.5.6, with stitching of proper tension. (Tension shall be determined by a firm pull with the hands along the line of stitching. If the tension is too tight, the stitching will
43、 break or appear tight to the point of breaking. If the tension is too loose, the stitching will appear as a series of loops.) 3.4.5.2 Run - offs. Run - offs onto a single cloth or beyond the seams or hem margins shall be removed and replaced as speci fied in 3.4.5.6. 3.4.5.3 Kinks. Kinks (sometimes
44、 called “knotty thread”) may occasionally be encountered. Stitching containing kinks that are closer to each other than 2 inches shall be reinforced as specified in 3.4.5.5. 3.4.5.4 Splices. The stitch ing splices shall be either superimposed stitching or adjacent stitching that is placed a maximum
45、of 1/16 inch, but within the minus tolerance specified for the seam margins, from the stitching which is being spliced. The stitching splices shall overlap 2 to 4 inches. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL - DTL - 7567C 6 3.4.5.5 Rei
46、nforcement stitching. Reinforcement stitching shall lie adjacent to, or superimpose, the stitching being reinforced but shall not exceed the minus tolerance specified for the seam margins. Reinforcement stitching shall reasonab ly match the length and the tension of the stitches being reinforced, an
47、d the stitching shall overlap the ends of the defective stitching 1 inch each end. 3.4.5.6 Replacement of stitching. Repairs that require the replacement of single rows of stitchi ng may be made using a single - needle machine. Repairs that require the replacement of both rows of double - needle sti
48、tching shall be made using a double - needle machine. Repairs that require the replacement of triple rows of stitching may be made using eit her a single - needle machine or a four - needle machine from which one needle has been removed. Ends of replacement stitching shall overlap the ends of the st
49、itching being replaced 2 inches at each end. 3.4.5.7 Holes and linear cuts or tears. Holes not ex ceeding inch diameter and linear tears or cuts up to inch length may be darned. The darned area of holes shall extend 3/8 inch beyond the edge of the hole on all sides and shall be either a round or rectangular pattern. the darned area of linear tear s and cuts shall form a rectangular pattern extending inch beyond each side and each end o
