1、 The following commercial specification is adopted from the military document. Revision A includes all known accepted revisions, amendments, notices, and Department of Defense (DoD) engineering changes previously developed for this item. Revisions B and forward include changes adopted to reflect tec
2、hnology and design evolution. WEBBING, TEXTILE, ARAMID, TUBULAR The Parachute Industry Association makes this document available for use by Industry and Government organizations that wish to apply this specification to their products. 1. SCOPE 1.1 Scope. This specification covers woven Aramid tubula
3、r webbing of aircraft quality. 1.2 Classification. The webbing shall be of three types, as specified in TABLE I. 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in Sections 3 and 4 of this specification. This section does not include documents cited in other s
4、ections 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 specified requirements of the documents cited in Sections 3 and 4 of this specificati
5、on, whether or not they are listed. 2.2 Government publications. 2.2.1 Government publications. The following Government publication forms a part of this document. FEDERAL TRADE COMMISSION (FTC) 16 CFR 303 - Rules and Regulations Under the Textile Fiber Products Identification Act (Copies are availa
6、ble online at: www.ftc.gov or from the Federal Trade Commission, 600 Pennsylvania Avenue, N.W. Washington, DC 20580-0001. Electronic copies may also be obtained from www.access.gpo.gov/.) 2.3 Non-government publications. The following documents form a part of this document. PIA-W-38282C 21 September
7、 2015 Superseding PIA-W-38282B 01 December 2011 DISTRIBUTION STATEMENT: All Rights Reserved. No Part of this publication may be reproduced without prior written permission from Parachute Industry Association. Additional copies may be purchased on-line from PIA Specifications and Products at: . Copyr
8、ight Protected: Do Not Copy! PIA-W-38282C Page 2 of 10 AMERICAN SOCIETY FOR QUALITY (ASQ) ANSI/ASQ Z1.4 - Sampling Procedures and Tables for Inspection by Attributes (Application for copies should be addressed to the American Society for Quality, 600 North Plankinton Avenue, Milwaukee, WI 53203. Ele
9、ctronic copies may be obtained from www.asq.org. ) ASTM INTERNATIONAL (ASTM) ASTM D1423 - Standard Test Method for Twist in Yarns by Direct- Counting ASTM D1776 - Standard Practice for Conditioning and Testing Textiles ASTM D1907 - Standard Test Method for Linear Density of Yarn (Yarn Number) by the
10、 Skein Method ASTM D3774 - Standard Test Method for Width of Textile Fabric ASTM D3775 - Standard Test Method for Warp (End) and Filling (Pick) Count of Woven Fabrics ASTM D3776 - Standard Test Methods for Mass per Unit Area (Weight) of Woven Fabric (Application for copies should be addressed to the
11、 ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19426-2959. Electronic copies may be obtained from www.astm.org.) AMERICAN ASSOCIATION OF TEXTILE CHEMISTS AND COLORISTS (AATCC) AATCC 20 - Fiber Analysis: Qualitative (Application for copies should be addressed to AATCC National Head
12、quarters, P.O. Box 12215, Research Triangle Park, NC 27709-2215. Electronic copies may be obtained from www.aatcc.org.) PARACHUTE INDUSTRY ASSOCIATION PIA-TEST METHOD-4108 - STRENGTH AND ELONGATION, BREAKING; TEXTILE WEBBING, TAPE AND BRAIDED ITEMS (Electronic copies may be obtained from .) 2.4 Orde
13、r of precedence. Unless otherwise noted herein or in the contract, 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, supersedes applicable laws and regulations unless a specific
14、 exemption has been obtained. 3. REQUIREMENTS 3.1 First Article. When fist article is specified (see 6.1), a sample representative of the production quality shall be submitted for first article inspection in accordance with 4.2. Copyright Protected: Do Not Copy! PIA-W-38282C Page 3 of 10 3.2 Materia
15、ls. 3.2.1 Yarn. The yarn shall be a nonmelting, aromatic polyamide. The yarn shall not char at a temperature less than 675F, when tested as specified in 4.6. 3.2.2 Denier and Filament. The yarn shall be 200 15 denier and shall consist of 100 filaments. 3.2.3 Twist. The final ply of yarn shall be twi
16、sted so as to have a minimum of 2.5 tpi. 3.3 Construction and physical requirements. The finished webbing shall conform to TABLE I and 3.3.1 through 3.3.4. TABLE I Construction and physical requirements. Characteristic Type I Type II Type III Type IV Width, inches 9/16 1/16 3/4 1/16 1 1/16 3 3/16 1/
17、16 Thickness, inches (maximum) 0.080 0.095 0.120 0.045 Weight, oz./yd. (maximum) 0.65 1.1 1.75 1.85 Breaking strength, pounds, unaged (minimum) 1400 2300 4000 2250 Breaking strength, pounds, aged (percent of unaged) 85 85 85 85 Elongation, percent (minimum) 12.0 15.0 20.0 - Ends (minimum) 177 145 25
18、1 309 Picks per inch (minimum) 24 24 24 60 Ply (minimum) 4 8 8 4 3.3.1 Weave. The weave shall be tubular, plain, one up and one down. 3.3.2 Color. Unless otherwise specified (see 6.1) the color of the webbing shall be as specified in the procurement document. The color may be obtained by use of melt
19、 spun solution dyed yarn. 3.3.3 Visual shade matching. When evaluated in accordance with 4.9.3, the color of the finished webbing shall match the standard with sources simulating artificial daylight and shall be a good match to the standard under incandescent lamplight. 3.3.4 Length and put-up. Unle
20、ss otherwise specified (see 6.1) webbing shall be furnished on spools containing yardage as given below: Note: 1/ No piece shall be less than 20 yards in length. Type Yardage 1/ Number of pieces (maximum) I 425 10 5 II 260 10 3 III 160 10 2 IV 160 10 2 Copyright Protected: Do Not Copy! PIA-W-38282C
21、Page 4 of 10 3.4 Identification of product. Each spool shall have a label or tag marked with the following information and attached in such manner as to remain in place until all webbing has been removed from the spool. - WEBBING, TEXTILE, ARAMID, TUBULAR - Type, class and specification number - Wid
22、th - Gross yardage - Number of pieces - Name of contractor - Date of manufacture (month and year). 3.5 Fiber identification. Each spool of webbing shall be labeled, ticketed or invoiced for fiber content in accordance with the Textile Fiber Products Identification Act as per 16 CFR 303. 3.6 Workmans
23、hip. The finished webbing shall be clean, evenly woven and shall conform to the quality and grade of product established by this specification. The occurrence of defects shall not exceed the levels set by the applicable quality levels. 3.7 Date of manufacturer. When required by the procurement docum
24、ent, the textile manufacturer shall properly identify the age of the textile materials by placing a tag on the finished goods, or label on the containers, identifying the specification to which the material is manufactured, the lot number and the date of manufacture. The date of manufacture is defin
25、ed as the date (month and year) of the last manufacturing process that affects the physical characteristics of the material. 4. VERIFICATION 4.1 Classification of inspection. The inspection requirements specified herein are classified as follows: 1. First article inspection (see 4.2) 2. Conformance
26、inspection (see 4.3). 4.2 First article inspection. The first article, submitted in accordance with 3.1, shall be inspected as specified in 4.3 through 4.4 for compliance with design, construction, workmanship and dimensional requirements. 4.3 Conformance inspection. Conformance inspection shall inc
27、lude the examination of 4.6 and the tests in 4.7 through 4.9.2. Sampling for inspection shall be performed as specified in this document unless otherwise specified in the contract or order (see 6.1). 4.4 Responsibility for compliance. All items shall meet all requirements of Sections 3 through 5. Th
28、e inspection set forth in this specification shall become a part of the contractors overall inspection system or quality program. The absence of any inspection requirements in the specification shall not relieve the contractor of the responsibility of ensuring that all products or supplies, submitte
29、d to the Government for acceptance, comply with all requirements of the Copyright Protected: Do Not Copy! PIA-W-38282C Page 5 of 10 contract. Sampling in quality conformance does not authorize submission of known defective material, either indicated or actual, nor does it commit the Government to ac
30、cept defective material. 4.5 Certificate of Compliance. Where Certificates of Compliance are submitted with TABLE V, they shall contain verifiable actual test and inspection data. The Government reserves the right to inspect such items to determine the validity of the certification. 4.6 Component te
31、sting. In addition to the quality assurance provisions of the subsidiary specifications, component materials listed in TABLE II shall be tested for the specified characteristics in accordance with the referenced test methods. The sample size and acceptance number shall be as shown in TABLE IV. The s
32、ample unit shall be 1 cone, 1 tube or 1 spool. The lot shall be unacceptable if one or more units fail to meet any requirement specified. TABLE II Testing of components. Characteristic Requirement paragraph Number of determinations Test method Denier 3.2.2 3 ASTM D1907 1/ Ply TABLE I 1 Visual Twist
33、3.2.3 3 ASTM D1423 Carbonization 2/ 4.6.1 1 AATCC 20 Notes: 1/ Denier shall be calculated as follows and shall be reported to the nearest whole number: Denier = Weight in grams x 9840 Length in yards 2/ The suppliers Certificate of Compliance showing that the yarn identified in 6.2 was used may be s
34、ubmitted in lieu of test method. If a determination is made, the specimen shall be taken from the woven webbing. 4.6.1 Carbonization. 4.6.1.1 Apparatus. A suitable melting point apparatus meeting test method requirement shall be used to determine the carbonization point of the yarns. 4.6.1.2 Procedu
35、re. A sufficient number of fibers shall be removed from the yarn sample for observation of carbonization. The temperature at which the yarn begins to stiffen or char shall be considered the end point of the test. 4.7 End item inspection. 4.7.1 Yard-by-yard examination. The required yardage of each p
36、iece shall be inspected and visual defects classified as listed in TABLE III. The defects found shall be counted, regardless of their proximity to each other, except where two or more defects represent a single local condition of the webbing, in which case only the more serious defect shall be count
37、ed. A continuous defect shall be counted as one defect for each yard or fraction thereof in which it occurs. The lot size shall be expressed in yards. The sample unit shall be 1 linear yard. Acceptance sampling shall be determined by using Inspection Level II with an Acceptance Quality Limit (AQL) o
38、f 0.15 for major defects and 1.5 for total defects (major and minor Copyright Protected: Do Not Copy! PIA-W-38282C Page 6 of 10 combined). For critical defects, the lot shall be rejected when one or more critical defects are found in the sample size. The number of rolls from the sample yardage to be
39、 selected shall be in accordance with TABLE IV. The sample yardage shall be apportioned equally among the selected rolls. TABLE III Classification of defects. Defect Description Critical Major Minor Abrasion marks Resulting in rupture of yarns or in nap sufficient to obscure the identity of any yarn
40、 exceeding 10 percent of width or 1 inch in length 01 Broken or missing end 2 or more regardless of length or single end exceeding 6 inches in length. Single end under 6 inches but exceeding 1/4 inch 02 Broken or missing pick 2 or more regardless of extent 03 Coarse or light filling bar Resulting in
41、 a difference in stiffness of webbing and extending for more than 1/4 inch in the length direction 201 Resulting in noticeable 1/ difference in stiffness or thickness of webbing for 1/4 inch or less in the length direction 202 Crease or wrinkle Twisted or distorted. Will not lay flat upon applicatio
42、n of manual pressure 203 Cut, hole or tear Any cut, hole or tear 04 Drop-ply Clearly noticeable 1/ on more than 2 ends within same length and extending over 9 linear inches or more 05 Clearly noticeable 1/ on 1 or 2 ends within same length and extending over 9 linear inches or more 204 Edge beaded o
43、r corded Noticeable 1/ increase in edge thickness or edge 205 Edge folded or rolled (See crease or wrinkle defect) 206 Edge loopy Forming clearly noticeable 1/ filling loops or edge tied loosely to body of webbing for 9 linear inches or more 101 Edge loose (slack) Resulting in waviness, distortion i
44、n orientation of filling or looseness along edge 102 Edge-nicks or bumps Any nick or bump falling outside the width tolerance as specified or exceeding 1/4 inch in length 103 Edge cut, torn or frayed Any cut, torn or frayed edge, clearly noticeable 1/ rupture of yarn along edge 06 Edge tight Resulti
45、ng in noticeable 1/ tension along edge or pucker, waviness, bagginess or slackness that cannot be flattened by manual pressure 07 Fine or light filling bar, light place Clearly noticeable 1/ 104 Hitchback crack Clearly noticeable 1/opening between adjoining picks or tension area over part of the wid
46、th resulting in noticeable 1/ light and heavy places 207 Jerked-in filling, slough-off and slug More than twice the thickness of the normal yarn 208 Copyright Protected: Do Not Copy! PIA-W-38282C Page 7 of 10 TABLE III Classification of defects (contd). Defect Description Critical Major Minor Kinks
47、More than twice the thickness of the normal yarn 105 Knots More than 2 knots in any 9 linear inches Single knot with untrimmed ends extending more than 1/16 inch from surface 106 Slack end 2 or more in the same length, jerked in between picks or forming clearly noticeable 1/ loops on the surface 107
48、 Single jerked in between picks or forming clearly noticeable 1/ loops on the surface 209 Slub or slug, gout More than twice the thickness of the yarn (or ply if plied) 210 Smash Any smash 08 Spot, stain or streak Any clearly noticeable 1/ dirt, rust, grease, oil spot, stain or streak 211 Tight end
49、Clearly noticeable 1/ 108 Tight pick or tight filling Resulting in rolling of webbing (also see edge scalloped defect) 109 Wrong draw Extending for more than 9 inches 110 Note: 1/ The terms “clearly noticeable” and “noticeable” contained in defect descriptions shall be interpreted to mean clearly visible at normal inspection distance (approximately 3 feet). 4.7.2 Overall examination. Each defect listed below shall be counted no more than once in each spool examined. The sample uni
