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 by DoD and Ind
2、ustry to reflect technology and design evolution. CORD, ELASTIC, EXERCISER AND SHOCK ABSORBER, FOR AERONAUTICAL USE 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
3、Scope. This specification covers the requirements for three types of elastic shock absorbing and exerciser cord for aeronautical use. 1.2 Classification. 1.2.1 Type Designation. The elastic cord shall be furnished in the following types, as specified (see 6.1): Type I - Straight cord with double bra
4、ided cover (shock absorbing) Type II - Endless ring (Bungee) with double braided cover (shock absorbing) Type III - Straight cord with single braided cover (exerciser cord). 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in Sections 3 and 4 of this specificat
5、ion. This section does not include documents cited in other sections of this specification nor is it 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 require
6、ments of the documents cited in Sections 3 and 4 of this specification, 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. PIA-C-5651C 29 June 2015 Superseding PIA-C-5651B 19 June 2013 DISTRI
7、BUTION 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: . Copyright Protected: Do Not Copy!PIA-C-5651C Page 2 of 13 F
8、EDERAL TRADE COMMISSION (FTC) 16CFR 303 - Rules and Regulations under the Textile Fiber Products Identification Act (Copies are available 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 w
9、ww.access.gpo.gov/ .) 2.3 Non-government publications. The following documents form a part of this document. AMERICAN ASSOCIATION OF TEXTILE CHEMISTS AMD COLORISTS (AATCC) AATCC 20A - Fiber Analysis: Quantitative AATCC 81 - pH of Water-Extract from Wet Processed Textiles (Application for copies shou
10、ld be addressed to AATCC National Headquarters, P.O. Box 12215, Research Triangle Park, NC 27709-2215. Electronic copies may be obtained from www.aatcc.org .) ASTM INTERNATIONAL (ASTM) ASTM D276 - Standard Test Method for Identification of Fibers in Textiles ASTM D1776 - Standard Practice for Condit
11、ioning and Testing Textiles (Application for copies should be addressed to the ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959. Electronic copies may be obtained from www.astm.org .) AMERICAN SOCIETY FOR QUALITY (ASQ) ANSI/ASQ Z1.4 - Sampling Procedures and Tables for Ins
12、pection by Attributes (Copies are available online at: www.asq.org or from the American Society for Quality, 600 North Plankinton Avenue, Milwaukee, WI 53203.) PARACHUTE INDUSTRY ASSOCIATION (PIA) PIA-TEST METHOD-6004 - LENGTH PER UNIT WEIGHT; CORDAGE PIA-TEST METHOD-6016 - STRENGTH AND ELONGATION O
13、F CORDAGE; NON-SPLICED METHOD (Electronic copies may be obtained from .) 2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict between the text of this specification and the references cited herein, the text of this specification shall take precedence
14、. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. Copyright Protected: Do Not Copy!PIA-C-5651C Page 3 of 13 3. REQUIREMENTS 3.1 First article. When specified (see 6.1), samples shall be subjected to first article inspection
15、 in accordance with 4.3. 3.2 Materials. 3.2.1 Strands. The strands shall be made from natural, synthetic, or a mixture thereof of synthetic natural rubber compound, having such qualities that when encased in a braided cover (Types I and II double braided, Type III single braided), the finished cord
16、shall conform to the requirements specified herein. Reclaimed rubber shall not be used. 3.2.2 Yarns. The yarns for the braid shall be spun from a good grade and staple of cotton that shall be free of imperfections and impurities. 3.3 Design and construction. The elastic shock absorber cord (Types I
17、and II) and the elastic exerciser cord (Type III) shall be composed of multiple strands tightly encased within a double layer of cotton braid for Types I and II and a single layer of cotton braid for Type III. 3.3.1 Strands. The strands shall be continuous throughout the length of the cord and, in a
18、 given cord, shall be of uniform size and configuration. Strands shall be thoroughly treated with soapstone or talc to prevent them from adhering to each other in the finished cord. 3.3.2 Braid. All cord shall be braided with a sufficient number of ends that, when the cord is elongated 100 percent,
19、the braid shall be tight and prevent dirt from entering between the individual yarns of the braid. The minimum number of ends in the braid for all cords shall be as specified in TABLE I. 3.3.2.1 Type I braid. The Type I cord shall be double braided from natural color cotton ply yarns. The outer brai
20、d shall consist of glazed (polished) yarns and the inner braid shall consist of soft finished yarns. 3.3.2.2 Type II braid. Type II bungee ring cord shall be double braided from natural color cotton ply yarns. The inner and outer braid shall be fabricated from glazed yarns. 3.3.2.3 Type III braid. T
21、ype III cord shall be a single cotton braid consisting of ply yarns of a colorfast color specified by the acquisition activity (see 6.1). 3.4 Size and tolerance. 3.4.1 Diameters. The elastic cord shall be furnished in the diameters specified in TABLE I. The tolerances, as applicable, shall be as fol
22、lows: Types I and II: +.047, -0 inch (+0.119, -0 cm) Type III: +.031, -0 inch (+0.079, -0 cm). 3.4.2 Lengths. Unless otherwise specified (see 6.1), the cord lengths shall be as specified in TABLE II. Copyright Protected: Do Not Copy!PIA-C-5651C Page 4 of 13 3.5 Physical properties. The physical prop
23、erties of the cords shall conform to TABLE III. Type II bungee ring cord shall meet all the requirements for Type I cord in addition to those for Type II. 3.6 Age limitation. Elastic cord furnished under this specification shall be not more than six (6) months old from date of manufacture to date of
24、 delivery (see 6.1). TABLE I Number of ends in braid. Size, outside dimension (O.D.) of finished cord, Number of ends inch (centimeters) Inner braid Outer braid TYPE I: .250 (.635) 16 24 .375 (.953) 24 48 .500 (1.27) 32 72 .625 (1.59) 48 72 .750 (1.91) 60 96 TYPE II: .250 (.635) 32 32 .375 (.953) 48
25、 48 .437 (1.11) 48 48 .500 (1.27) 48 48 .562 (1.43) 48 48 .625 (1.59) 48 48 .687 (1.75) 48 48 .750 (1.91) 64 64 .812 (2.06) 64 64 TYPE III: .125 (.32) 32 .187 (.476) 32 .312 (.794) 32 TABLE II Cord lengths, spools, and reels 1/. Cord size, diameter, inch (centimeters) Length, feet (metres) (5 percen
26、t) 2/.250(.635), .375(.953), .500 (1.27) 500 (150) .187(.474), .312(.792), .625 (1.588) 250 ( 75) .750 (1.905) 200 ( 60) Notes: 1/ Cord acquired in lengths not exceeding 50 feet (15 m) shall be furnished as coils. 2/Short lengths may be furnished; however, no individual length shall be less than 50
27、feet (15 m). (THIS SPACE HAS BEEN LEFT INTENTIONALLY BLANK) Copyright Protected: Do Not Copy!PIA-C-5651C Page 5 of 13 TABLE III Physical properties. Characteristic Requirements Type I Type III Diameter in inches (centimeters) .250 (.635) .375 (.953) .500 (1.27) .625 (1.59) .750 (1.91) .125 (.32) .18
28、7 (.476) .312 (.794) Weight: lbs/100 ft. kg/30m 2.4 5.5 9.0 14 22 1.85 1.3 3.1 1.1 2.5 4.0 6.3 9.8 .84 .58 1.4 Tensile properties, load: At 50 percent elongation: lbs. 8-12 30-60 80-120 100-180 200-350 1-2.5 2-6 5-10 kg. 3.6-5.5 13.6- 27.2 36.3- 54.5 45-82 91-159 .45-1.2 .91 -2.7 2.3-4.5 At 75percen
29、t elongation: lbs. kg. 10-18 50-100 110-190 160-250 300-450 1.9-3.4 4-8 6-12 4.5-8.2 23-45 50-86 73-113 136-204 .86-1.5 1.8-3.6 2.7-5.4 At 100 percent elongation: lbs. kg. 16-28 90-150 175-250 250-350 400-650 2.4-4.5 6-10 8-15 1.3-12.7 41-68 79-113 113-159 182-295 1.1-2.0 2.7-4.5 3.6-6.8 At 125 perc
30、ent elongation: lbs. kg. - - - - - 2.9-5.4 8-12 10-18 - - - - - 1.3-2.4 3.6-5.4 4.5-8.2 Breaking strength min.: lbs. kg. 120 300 400 500 1000 30 45 75 54.5 136 193 227 454 13.6 20.5 34 Ultimate elongation: Percent minimum 140 140 140 140 120 200 200 200 Drift, percent, maximum 20 20 20 20 20 10 10 1
31、0 Set, percent, maximum 10 10 10 10 10 5 5 5 Low temperature set, percent, maximum 10 10 10 10 10 5 5 5 Flex, cycles, minimum 5 x 10 4/5 x10 4/5x10 4/5x10 4/1x10 4/3.5x10 4/3.5x10 4/3.5x10 4/Low temperature exposure load, percent change from initial maximum +50 +50 +50 +50 +50 +12 +12 +12 After heat
32、 aging, percent change from initial value: Load at 100 percent elongation -35 to +20 -40 to +20 -40 to +20 -45 to +20 -50 to +20 -30 to +20 -30 to +20 -30 to +20 Breaking strength maximum -40 -40 -40 -40 -40 -20 -20 -20 Ultimate elongation, maximum -30 -20 -20 -20 -20 -20 -20 -20 Flex, cycles, minim
33、um 5 x 103/5 x 103/5 x 103/5 x 103/2 x 103/9 x 103/9x103/10x103/Copyright Protected: Do Not Copy!PIA-C-5651C Page 6 of 13 TABLE III Physical properties (contd.). Characteristic Requirements Type II Diameter in inches (centimeters) .250 (.635) .375 (.953) .438 (1.11) .500 (1.27) .562 (1.43) .625 (1.5
34、9) .687 (1.75) .750 (1.91) .812 (2.06) Load at 100 percent elongation: lbs. kg. 32-56 180-300 260-400 350-500 425-600 500-700 650-850 800-1300 1100-1500 14.5-25.4 82-136 118-182 159-227 193-272 227-318 295-386 363-590 499-681 TABLE IV Dimension sample size and acceptance number. Lot size, feet ( met
35、ers) 1/Sample size cores, coils, or spools 2/Maximum number of defects acceptable in sample Up to 1,300 (up to 400) 3 0 1,301 to 3,200 (401 to 980) 5 0 3,201 to 8,000 (981 to 2,440) 7 0 8,001 to 22,000 (2,441 to 6, 700 ) 10 0 22,001 to 110,000 (6,701 to 33,500) 15 1 110,001 and over (33,501 and over
36、) 25 1 Notes: 1/Metric conversions are not exact. 2/When a lot contains fewer than 3 rolls, coils, or spools, the entire lot shall be the sample. TABLE V Visual examination. Examination Defect Major Minor Marker threads Not correct color code or showing more than 6 months of age X 1/Cord strands Not
37、 stranded X Strands adhere to each other X Cover Abrasion marks resulting in a weak spot X Broken or missing yarn Two or more contiguous regardless of length X Knot, clearly visible 2/X Spot or stain, clearly visible 2/X Does not adhere tightly to the cord X Float multiple X Notes: 1/Any spool or co
38、il indicated overage by marker end examination shall be removed and replaced with another sample. When corrected, this examination shall not be scored as a defect. 2/Observed at normal inspection distance (approximately 3 feet (1 m). Copyright Protected: Do Not Copy!PIA-C-5651C Page 7 of 13 TABLE VI
39、 Quality conformance physical property inspection. Property Requirement Test paragraph Number of determinations per unit of product 1/Weight per 100 feet (30 m), maximum TABLE III 4.6.1.3 1/ Load in lbs: 2/50 percent elongation TABLE III 4.6.2 3 3/75 percent elongation TABLE III 4.6.2 3 100 percent
40、elongation TABLE III 4.6.2 3 125 percent elongation TABLE III 4.6.2 3 Breaking strength, lbs., minimum TABLE III 4.6.2 3 Ultimate elongation percent, minimum TABLE III 4.6.2 3 Notes: 1/Reporting of test results shall be as specified in the applicable test paragraph and 4.5.2. 2/Load in pounds (lbs.)
41、 shall be determined dependent on type applicability (see TABLE III). 3/The specimens for 50 percent elongation shall be used to determine the remaining properties specified in 4.6.2. 3.6.1 Date of manufacture (see 6.1). When required by the procurement document, the textile manufacture shall proper
42、ly 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 defined as the date (month and year) of the last
43、manufacturing process that affects the physical characteristics of the material. 3.7 Product identification. The elastic cord shall be identified as to type and date of manufacture by using dyed yarns as part of the outer braid. Type I cords shall be identified by two dyed ends indicating year of ma
44、nufacture (see 3.7.1.1) and a third indicating quarter of the year manufactured (see 3.7.1.2). Type III cord shall utilize three dyed ends for the year (see 3.7.1.1) and a fourth dyed end for the quarter of manufacture (see 3.7.1.2). The identification ends shall be separated by one or two natural c
45、olor or olive drab dyed ends. 3.7.1 Identification yarn colors. 3.7.1.1 Year of manufacture. The following colorfast identification yarn colors shall be used to distinguish the year of manufacture: 2015 - Black 2016 - Green 2017 - Red 2018 - Blue 2019 - Yellow For succeeding years, this cycle shall
46、be repeated. 3.7.1.2 Quarter of the year manufactured. The following colors shall be used to distinguish the quarter of year manufactured: Copyright Protected: Do Not Copy!PIA-C-5651C Page 8 of 13 January through March - Red April through June - Blue July through September - Green October through De
47、cember - Yellow 3.8 Workmanship. The end item shall conform to the quality of the product established by this specification and the occurrence of defects shall not exceed the applicable quality limits. 4. VERIFICATION 4.1 Responsibility for inspection. Unless otherwise specified in the contract or p
48、urchase order, the contractor is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specified in the contract or purchase order, the contractor may use his own or any other facilities suitable for the performance of the inspection requirements spe
49、cified herein, unless disapproved by the Government. The Government reserves the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. 4.2 Classification of inspection. The inspection requirements specified herein are classified as follows: a. First article inspection (see 4.3) b. Conformance inspection (see 4.4). 4.3 First article inspectio
