MIL-W-38461C.pdf

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MIL-W-38461 C( USAF)

23 July 1982

SUPERSEDING

MIL-W-38461 B(USAF)

15 August 1972

MILITARY SPEC I FICAT ION

WEBBING, NYLON, AIRCRAFT ARRESTING

T h i s specification i s approved for use by the Department of the Air Force, and is avai lable for use by a l l Departments and Agencies of the Department of Defense.

1 . SCOPE

1.1 Scope. T h i s specification covers two types of nylon and one type of nylon/polyester webbing fo r use i n landbased a i r c r a f t arrest ing systems.

1.2 Classification. The webbing shall be of the following types, as specified (see 6.2). The types shall be for use w i t h the designated arrest ing systems.

Type I - BAK-l2/B32A Type I I - BAK-l3/F48A Type I I I - BAK-l3/F48A

(Center Pick)

2. APPLICABLE DOCUMENTS

2.1 Government documents.

Beneficial comments (recommendations, additions, delet ions) and any pertinent data which may be of use i n improving this document should be addressed t o the Air Force Wright Aeronautical Laboratories, MLSA, Wright-Patterson Air Force Base, Ohio 45433, by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing a t the end of this document or by le t te r .

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MIL-W-384bLC 17 97777Ob 0195748

MIL-W-38461 C( USAF)

2.1.1 Standard and drawings . Un1 ess otherwise speci f ied (see 6,2), t he fo l lowing standard and drawings o f the issue l i s t e d i n t h a t issue of the Department of Defense Index o f Speci f icat ions and Standards (DoDISS) spec i f ied i n the s o l i c i t a t i o n , form a p a r t o f t h i s s p e c i f i c a t i o n t o the extent spec i f ied herein.

STANDARDS

FEDERAL

FED-STD-191 T e x t i l e Test Methods

DRAW I NGS

E.W. B l i s s Company Sewing Requi rements , BAK-13 52-D-844, Revision A

E.W. B l i s s Company P-574

E.W. B l i s s Company P-311

Shipping Reel

Shi pp i ng Reel

(Copies of standards and drawings required by manufacturers i n con-nect ion w i t h a c q u i s i t i o n funct ions should be obtained from the contract ing a c t i v i t y o r as d i rected by the contract ing o f f i c e r . )

2.1.2 Other Government publ icat ions. The fol lowing other Government document forms a pa r t o f t h i s s p e c i f i c a t i o n t o the extent specif ied herein .

FEDERAL TRADE COMMISION

T e x t i l e Fiber Products I d e n t i f i c a t i o n Act, E f f e c t i v e March 3, 1960, (Copies may be obtained without charge from the Federal Trade Com-missions Washington, D.C. 20580.)

2.1.3 Order o f precedence.

t e x t o f t h i s spec i f i ca t i on and the references c i t e d herein, the t e x t

I n the event o f a c o n f l i c t between the o f t h i s spec i f i ca t i on s h a l l take precedence.

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MIL-W-38463C 17 7797706 0375747 b

MIL-W-38461 C(USAF)

3. REQUIREMENTS

3.1 Yarn. The yarn used shal l be a s follows: Types I and I I - 840 o r 1260 denier, b r i g h t , high-tenacity, l i g h t and heat r e s i s t an t polyamide prepared from hexamethylene diamine and adipic acid or i t s der ivat ives and have a min imum mel t t n g point of 4720 F (2440 C ) Type I I I Ground, Binder, and.Stu7fer - 1260 denier, bright, h igh -tenaci ty , 1 ight and heat r e s i s t an t polyamide prepared from hexamethylene diamine and adipic acid or i t s derivatives and have a minimum melting p o i n t of 472OF (244%). F i l l i n g 1000 or 1100 denier, polyester f i be r identified as polyethylene glycol terephthalate w i t h a m i n i m u m me t i n g p o i n t of 472OF (244OC).

3.1.1 Ply and twist. The f ina l ply of yarn, as speci'fied i n Tab shall be twisted together i n one operation.

e I ,

3.2 Resin treatment.

3.2.1 Resin. The resin used t o t r e a t ' t h e webbing shall consist of polyvinyl butyral plast ic ized w i t h butyl r ic inolea te and applied by water dispersion. Fine carbon black shall be added t o the resin t o produce a uniform black color.

3.2.2 Extractable matter. The extractable matter from the resin treated webbing shall be from 3.1 t o 8.5 percent by weight, when tested a s specified i n 4.6.3.

3.3 Color. The color of the webbing, a f t e r resin treatment, be b l a c k .

3.4 Construction and physical properties. The finished Webb

conform t o the requirements o f Table I .

3.4.1 Sewed loops - type I I and I I I only.

shall ng sha l l

3.4.1.1 Breaking strength. The loops for Types I I and I I I webbing, one loop on each end, shall be sewed i n accordance w i t h E, \ . Bliss Company Drawing 52-D-844. Three (3) of f ive (5) t es t specimens thus prepared shall have a m i n i m u m breaking strength of not less than 110,000 pounds each and the other two test specimens shall have a min imum breaking strength of not l e s s than 100,000 pounds each.

3.4.1.2 The maximum w i d t h o f the sewed loop shall be no greater than 8-1/8 inches a t any p o i n t along the en t i r e l eng th of the loop.

Any ro l l not meeting this requirement i s not acceptable.

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MIL-W-38461C 17 W 9 7 9 7 7 0 6 0275750 2

MIL-W-38461 C (USAF)

3.5 Weave. The weave for Types I , I I , and I I I shall be as shown i n Figures 1 , 2 , and 3 respectively.

3.5.1 Edge wear markers. There shall be 2 yellow marker ends i n t he center of each selvage s tu f f e r as shown i n Figures 1 , 2, and 3.

The yellow marker shall be a 840/5 ply for types Ï and I I I and 840/7 ply for type I I . The marker yarns shal l be solution dyed nylon or yarn dyed polyester t o cable No. 65023, Color Association of United States , Incorporated, 200 Madison Avenue, New York, NY 1001 6.

3.6 Length of rol l . The length of roll shall be as specified by the procuring ac t iv i ty .

3.7 Fiber ident i f ica t ion . Each roll of webbing shal l be labeled, t icketed, or invoiced for f iber content i n accordance w i t h the Textile Fiber Products Ident i f icat ion Act, effect ive 3 March 1960.

3.8 St i f fness . The angle subtended by the ve r t i c l e distance drop of the end o f a 36 inch length of webbing when extended 16 inches beyond the edge of a horizontal surface shal l not be greater t h a n 35 degrees when tested i n accordance w i t h 4.6.4.

3.9 Workmanship. The finished webbing shal l be clean,. evenly woven, and shall conform t o the qual i ty and grade of product established by t h i s specification .

4. QUALITY ASSURANCE PROVISIONS

4.1 Responsibility for inspection. Unless otherwise specified i n the contract or purchase order, the contractor i s responsible for the performance of al 1 inspection requirements as specified herein.

Except as otherwise specified i n the contract o r purchase order, the contractor may use.his own or any other f a c i l i t i e s suitable for the performance of the inspection requirements specified herejn, unless disapproved by the Government. The Government reserves the r i g h t t o perform any of the inspections set forth i n the specification where such inspections a re deemed necessary t o assure supplies and services conform t o prescribed requirements.

4.2 Qual i t y conformance inspection. The qual i ty conformance inspection shal l consis t of the examinations and t e s t s specified herein. The manufacturer shall examine a l l webbing prior t o resin teatment for

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MIL-W-38461C(USAF)

c r i t i c a l defects and for overall clean1 iness to insure uniformity of resin application. Any contamination which may in te r fe re w i t h t he level of resin application shall be removed before processing.

4.3 Yard-by-yard examination. The sample size shall be examined on both sides prior t o the resin treatment and visual defects c las-s i f i ed as l i s t ed i n Table I I . A l l defects found shall be counted regardless of their proximity one t o another, except when two or more defects represent a single local condition of the webbing, i n which case only.the more serious defect shall be counted. A con-tinuous defect shall be counted a s one defect for each warp-wise yard or f ract ion thereof i n which i t occurs. .The sample u n i t fo r this examination shall be one l inear yard. The l o t s ize shall be expressed i n units of one l inear yard. There sha l l be no more than f ive tapes i n any one lo t . The sample s ize sha l l be i n accordance w i t h inspection level I I I of MIL-STD-105. The acceptable quali ty level (AQL) shall be 1.0 defects per hundred l inear yards for major defects, and 2.5 defects per hundred yards for total (major p l u s minor) defects. The l o t shall be unacceptable i f one or more c r i t i c a l defects appear i n the sample. For any c lear ly v is ib le defect not described i n Table I I a . c l a s s i f i ca t ion sha l l be made by the contractor according t o the severity of the defect and sha l l be subject t o .approval by the Government.

4.4 Examination for compliance w i t h Textile Fiber Products Identi-f icat ion Act. Each ro l l of the webbing s h a l l be examined for con-formance t o the Textile Fiber Products Identification Act.

4.5 Test conditions. A producer may elect t o conduct physical tesging gnder other than standard laboratory conditions of 70 2 2OF (21 t 17 C ) and 65 + 2 percent re la t ive humidity. However, the Government reserves-the r i g h t t o specify testing conditions i n cases of dispute or whenever deemed necessary to assure conformance to physical requirements.

4.6 Testing of the end item.

FED STD 191, wherever applicable, as l i s t ed i n Table I I I , 4.6.1,

4.6.2 and 4.6.3 sha l l be followed. Conformance for w i d t h and thick-ness shall be based on a single determination.

sample of webbing-to conform t o the requirements of section 3 shall be cause for rejection of the r o l l .

The methods of tes t ing specified i n

Failure of any t

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MIL-W-3ôLlb1C 17 m 9 ï î ï ï O b 0175757 5 m

MIL-W-38461 C( USAF)

TABLE I I . Classification of defects.

Description Cri t ical Major Minor Defects . .

Abrasion marks

Broken or miss-i n g p i c k

Broken or miss-i n g end(s)

Resulting i n broken filaments greater than 1 inch i n any direction and t o the degree suff ic ient t o obscure the ident i ty of an i n d i v i d u a l yarn.

Resulting i n broken filaments 1 inch or l e s s i n any direction and t o the degree suff ic ient t o obscure the ident i ty of an individual yarn.

Occurring separately or i n combination for two or more adjacent picks on the same side of the webbing.

Occurring separately or i n combination two or more picks not adjacent i n 1 l inear yard on the same side o f webbing.

Single pick regardless of frequency.

Two or more adjacent ends exceeding 6 inches i n length or single end exceeding 12 inches i n length.

Two or more adjacent ends l e s s t h a n 6 inches bu t longer than 3 inches i n length or a single end less than 12 inches b u t longer t h a n 6 inches i n l e n g t h .

Two or more adjacent ends l e s s than 3 inches i n length b u t exceeding 1 inch o r a single end less t h a n 6 inches bu t exceeding 1 inch.

X

X

X

X

X

X

X

X

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MIL-W-384bLC 17 979990b O195758 7 1

MI L-W-38461 C( USAF)

TABLE I I . Classification of defects. - Continued.

Defects Description Cri t ica l Major Minor

Coarse or 1 i g h t f i l l i n g bar

C u t , hole ( m i n i m u m of 1/8 inch away from edge)

Edge loopy

Resulting i n v i s ib le d i f fe r -ence i n thickness of webbing extending for more t h a n 1/2 inch i n the length direction over more than 50% of the w i d t h .

Resulting i n v i s ib le d i f fe r -ences in thickness of webbing extending for more than 1/4 inch bu t l e s s than 1/2 inch i n the l e n g t h direction over more t h a n 50% of w i d t h .

Resulting i n v i s ib le d i f fe r -ences i n thickness of webbing extending less than 1/4 inch i n the length direction over more than 25% of the w i d t h .

Resulting i n exposure o f s tuf fe r yarns.

Clearly v is ib le on more t h a n two ends and extending over 9 l inear inches or more, Forming loops greater than 1/8 Inch diameter w i t h i n 1/4 inch of the edge for 2 l inear inches or more.

Forming loops greater than 1/8 inch in diameter w i t h i n 1/4 inch of the edge for more than 1 /2 inch b u t l ess t h a n 2 l inear i ne hes.

X

X

X

X

X

X

X

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MIL-W-384bLC 17 7777706 0175757 7

TABLE I I . Classif icat ion of defects. - Continued.

Defects Description Critical Major Minor

Edge cut, torn or frayed

F1 oats or skips

Jerked i n , f i 11 i n g , slough-off, slug

K i n ks

Knots

Mi spick, double p ck

Complete separation of two X or more yarns w i t h i n 1/8 inch of the edge.

Complete separation of one yarn w i t h i n 1/8 inch of the edge.

Multiple, 1/2 i n c h or more i n combined warp and f i l l i n g direct ion or single f l o a t or s k i p over more than 1 inch.

Multiple, l e s s than 1/2 inch i n combined warp or f i l l i n g direct ions o r s ingle f l o a t or s k i p over more than l / 2 inch, b u t not exceeding 1 inch, i f i n warp, or more than 1/4 inch o f the w i d t h , b u t not exceeding 1 inch, i f i n f i l l i n g .

A c lear ly v is ib le loop of f i l l i n g pulled i n a t edges.

More than three i n any 9 l i nea r inches.

More than one k n o t i n any 5 1 i near i nc hes.

Two or more across f u l l w i d t h .

Single across the f u l l w i d t h .

X

X

X

X

X

X

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MIL-W-38461C 37 m 977990b 0395760 5 m

TABLE I I . Classification of defects. - Continued.

Defects Description Cri t ical Major Minor

Slack end Two or more for a m i n i m u m of o f 1/2 inch i n l e n g t h when the tape i s l a i d f l a t and w i t h o u t loop d is tor t ion w i t h the i n -ser t ion of a 1/8 i n c h diameter rod.

Single for a minimum of 1 inch i n length when the tape i s la id f l a t and without loop d is tor t ion w i t h the insertion of a 1/8 inch diameter rod.

Slub or slag More t h a n twice the thickness of the yarn (or ply, if pl ied) .

X

Smash Any smash. X

Wrong draw Extending fo r more than 9 inches. X

X

X

NOTE:

any time before resin treatment. A properly done repair i s n o t a defect unless i t can s t i l l be seen and c l a s s i f i ed , Cri t ical defects shall not be repaired.

4.6.1 Component and material inspection. Components and materials shall be tested i n accordance w i t h a l l the requirements of referenced speci-f ica t ions , drawings and standards unless otherwise excluded, amended modif ied or qualified i n t h i s specification or applicable purchase documents.

s id ia ry specif icat ions, component materials l i s t e d i n Table I I I shall be tested for the charac te r i s t ics specified and i n accordance w i t h the referenced tes t methods of FED STD 191. The l o t s ize shall be expressed i n pounds, and the sample u n i t shall be 500 yards of the nylon yarn.

The l o t shall be unacceptable if one or more units f a i l t o meet any requirement specified.

values u t i l i zed i n expressing the f inal result.

be as follows:

The contractor may repair a l l major and minor defects l i s ted

In addition t o the qual i ty assurance provisions of the sub-

All t e s t reports shall contain the individual The sample s i z e shall

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WIL-W-38461C 17 = 7797706 0175761 7 W

Lot s i ze (pounds) Sample size

800 or less 2 801 up t o and including 22,000 3 22,001 and over 5

4.6.2 Breaking strength - types I , I I , I I I .

4.6.2.1 Sampling. A 30-fOOt sample shall be taken from the lead end of the f i rs t roll of the resin treated webbing.

lengths shal l have a 30-foot sample taken from the las t end.

roll l e n g t h and corresponding 30-foot sample shall have the same number and shal l be numbered consecutively. Three ten-foot specimens sha l l be cut from each 30-foot sample.

4.6.2.2 Apparatus. The test grips for h o l d i n g the specimen shall be so designed tha t webbing f a i l u r e will not occur w i t h i n the g r i p .

The no-load r a t e of Jaw separation shall be 4 t o 8 inches per minute.

4.6.2.3 Sewed loops - type I I and I I I . Five specimens of type I I or I I I webbing shall be taken from the f irst production roll and loops formed i n accordance w i t h the sewing pattern of E.W. Bliss Company Drawing 52-D-844. The sewed loops shall be tested on a suf f ic ien t h i g h enough load capaclty machine so that the webbing rated breaking strength is not a t the extreme machine limits.

4.6.3 Extractable matter. The extractable matter, inclusive of the resin deposit , shall be determined on one (1) specimen of approximately 10 grams of the webbing. The sample, a f t e r separation of the warp and f i l l i n g yarns, shall beodrieg t o co[jstant geight i n a weighing bot t le a t a temperature of 220 5 8 F (104 4 . 5 C ) . The specimen shall then be placed i n a Soxhlet apparatus and a f t e r a 6-hour extraction w i t h methyl-ethyl-ketone, the f i n a l weight of the extracted sample shall be obtained by repeating the constant weight drying conditions as specified above. The percent of extractable matter shall be calculated as follows:

Continuous roll Each

Loss i n Wei h t on extraction Percent extractable matter = Original dr$ weight on sample

4.6.4 S t i f fness t e s t . A 36 inch length of webbing shall be precondi-tioned by placing the webbing on a horizontal surface and placing su f f i c i ee t weight on the webbing t o remove any long i tud ina l curvature a t 70-75 F and 65-70 percent RH, Immediately after the preconditioning period under the same atmospheric conditions the sample shall be extended 16 inches beyond the edge of the horizontal surface. The webbing sha l l be suf f ic ien t ly weighted t o keep i t f l a t on the horizontal surface. A t the end of a 4-hour period measurements shall be made t o determine the d rop angle.

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MIL-W-38461C 17 7777706 0175762 7

MIL-W-38461 C ( USAF)

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Table I I I footnotes (continued).

- 5/ For any visual w i d t h variation a w i d t h determination may be made a t t h a t location even though this 'may no t occur a t the specified 40 foo t l inear interval .

- 6/ Contractor's cer t i f ica t ion based on count of ends i n loom creel or beams i s acceptable i n l ieu of visual count from a webbing sample.

- 7/ Contractor's cer t i f ica t ion based on Ply and Turns/in. produced i n the yarn throwing process i's acceptable i n l i eu of visual and physical testing o f the y a h from the webbing sample.

5. PACKAGING

5.1 Packaging, packing and marking. Unless otherwise specified each roll shall be wound and enclosed for s h i p p i n g on wooden reel i n accor-dance with E.W. Bliss Company Drawing P-574 or P-311,

5.1.1 Special marking. One of the following special markings shall appear on' the interior and the ex ter ior of the s h i p p i n g containers.

Webbing , rîylon , Aircraf t Arresting , BAK-lUB32A.

Webbing, Nylon, Aircraf t Arresting, BAK-l.3/F48A.

6. NOTES

6.1 arres t i n g systems BAK-l2/B32A and BAK-l3/F48A.

6.2 d.-. Ordering data. Acqufs4 t ion documents shoul d speci f.y:

Intended use. The webbing i s intended for use i n landbased a i r c r a f t

a. Title, number and date o f this specif icat ion.

b. Type.

c. Quantity ( r a l l c ) .

d. Length of roll.

e , Manufacturer's identi 'fication.

f . Packaging and packing requirements (see 5.1 ) .

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7-

MIL-W-38461C 37 m 7777706 0335765 4

MIL-W-38461 C (USAF)

6 . 3 For access to a representative sample o f webbing, address the procuring activity issuing the invitation for bids.

Custodnan :

Air Force - 20

Review activity:

Air Force - 99

Preparing activity :

Air Force - 20

Project Number:

171 O-F037

*US. GOVERNMENT PRINTING OFFICE: 1912-505-022/1889 ,

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