1、- HIL-S-44022B 84 7777906 0432323 7 m - . r Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: U.S. Army Natick Research, Development, and Engineering Center, Natick, MA 01760-5014 by using the sel
2、f-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. I INCH-POUND f MIL-S-44022B 19 January 1990 SUPERSEDING MIL-S-44022A 29 May 1980 MILITARY SPECIFICATION STRAP, RETENTION, PARACHUTISTS HELMET This specification is approved or
3、 use by all Departments and Agencies of the Department of Defense. 1.2 Scope. This specification covers a parachutists helmet retention strap of one type and class. 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications, standards, and handbooks. The following specifications, standar
4、ds, and handbooks form a part of this document to the extent specified herein. 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). Unless otherwise specified, the issues of th
5、ese . DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. I_ -. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- = _I-_c- - MIL-S-44022B 4 999990b 0432324 9 W MIL-S-44022B MI LI TARY MIL-L-35078 - -oads, Unit: Preparatio
6、n of Semiperishable Subsistence Items; Clothing, Personal Equipment and Equipage; General Specification For MIL-P-44081 - Pad, Parachutists Helmet MIL-H-44099 - Helmet, Ground Troops and Parachutists STANDARDS MILITARY MIL-STD-105 - Sampling Procedures and Tables for Inspection by Attributes MIL-STD
7、-129 - Marking for Shipment and Storage MIL-STD-147 - Palletized Unit Loads MIL-STD-731 - Quality of Wood Members for Containers and Pallets (Unless otherwise indicated, copies of federal and military specifications, standards, and handbooks are available from the Standardization Documents Order Des
8、k, Bldg. 4D, 700 Robbins Avenue, Philadelphia, PA 19111-5094.) 2,1.2 Other Government documents, drawings, and publications. The following other Government documents, drawings, and publications form a part of this document to the extent specified herein. Unless otherwise specified, the issues are th
9、ose cited in the solicitation. e DRAWING U.S. ARMY NATICK RESEARCH, DEVELOPMENT, AND ENGINEERING CENTER 8-2-663 - Strap, Retention, Parachutists Helmet (Copies of drawings are available from the U.S, Army Natick Research, Development, and Engineering Center, ATTN: STRNC-EMSS, Natick, MA 01760-5014.)
10、 2.2 Non-Government publications. The following document forms a part of this document to the extent Specified herein. Unless otherwise specified, the issues of the documents which are DOD adopted are those listed in the issue of the DODISS cited in the solicitation, Unless otherwise specified, the
11、issues of documents not listed in the DODISS are the issues of the documents cited in the solicitation (see 6.2). AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) D 3951 - Standard Practice for Commercial Packaging (Application for copies should be addressed to the American Society for Testing and
12、Materials, 1916 Race Street, Philadelphia, PA 19103-1187.) 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-44022B 4 M 9999906 0412325 O - (Non-Government standards and other publications are normally available from the organizations that prep
13、are or distribute the documents. also may be available in or through libraries orsother informational services,) document and the references cited herein, the text of this document takes precedence. regulations unless a specific exemption has been obtained. These documents 2.3 Order of precedence. I
14、n the event of a conflict between the text of this Nothing in this document, however, supersedes applicable laws and 3. REQUIREMENTS 3.1 First Article. When specified (see 6.2), a sample shall be subjected to first article inspection (see 6.3), in accordance with 4.3. 3.2 Samples. Samples, when furn
15、ished, are solely for guidance and infor- mation to the contractor (see 6.4). appear in the sample in which case this specification shall govern, Variations from this specification may 3.3 Materials and components. Materials and components shall be as specified on Drawing 8-2-663. practical as long
16、as it meets the requirements of this specification. Replacement screw for parachutists helmet. pad (MIL-P-44081) and the retention strap into the ground troops - parachu- tists helmet (MIL-H-44099) the following screw is required: It is encouraged that recycled material be used when 3,3,1 To install
17、 the foam impact 8-32, 5/8 inch long, slotted, truss head, steel machine screw, finish: class 3, Type II, OD dull luster per w-P-416. 015470B or equal. Continental Scew Co. Part No. This screw plus a printed paper label (see 3.3.2.1 and 3.3.2.2) shall be 3.3.2 Labels, placed in a polyethylene bag (s
18、ee f11.1). The label paper shall be made of white commercial quality writing or printing paper having a minimum ba.sis weight of 20 pounds (17 by 22/500). 3.3.2.1 Instruction label. The paper label with legible and durable black marking (approximately 1/8-inch) shall read as follows : REPLACEMENT SC
19、REW FOR PARACHUTISTS HELMET INSTRUCTIONS REPLACEMENT SCREW FOR PARACHUTISTS HELMET TO INSTALL THE FOAM IMPACT PAD AND THE RETENTION STRAP INTO THE GROUND TROOPS PARACHUTIST HELMET. THE ENCLOSED 5/8-INCH LONG SCREW IS REQUIRED, -3 Provided by IHSNot for ResaleNo reproduction or networking permitted w
20、ithout license from IHS-,-,-MIL-S-44022B 3.3.2.2 Identification marking for the retention strap. The paper label with legible and durable black marking (approximately 1/4-inch) shall contain the following information: Item Description Contract Number Stock Number Suppliers Name 3.3.2.3 Combined inst
21、ruction and identification paper label. A combined instruction and identification paper label may be substituted with the information specified in 3.3.2.1 and 3.3.2.2, 3.4 Construction. The construction shall conform in all respects to Drawing 8-2-663 and as specified herein. 3.4.1 Stitching. All st
22、itching shall be as specified on Drawing 8-2-663 and as specified herein. 3.4.2 Thread tension. Thread tension shall be maintained so that there will. be no loose stitching resulting in loose bobbin or top thread, or excessively tight stitching resulting in puckering of the materials sewn. The lock
23、shall be embedded in the materials sewn. 3.4.3 Repairs of type 301 stitching, Repairs of type 301 stitching shall be as follows: a. When thread breaks or bobbin run-outs occur during sewing, the stitching shall be repaired by restarting the stitching a minimum of 1 inch behind the end of the stitchi
24、ng. - 1/ b. Thread breaks or two or more consecutive skipped or run-off stitches noted during inspection of the item (in-process or end item) shall be repaired by overstitching. The stitching shall start a minimum of 1 inch before the defective area and continue a minimum of 1 inch beyond the defect
25、ive area onto the existing stitching. by removing the defective stitching, without damaging the materials, and restitching in the required manner. Loose or excessively tight stitching shall be repaired L/ 1/ When making the above repairs, the end of the stitching is not required to be backstitched.
26、I 3.4.4 Automatic stitching, Automatic stitching machines may be used to perform any of the required stitch patterns provided the requirements for the stitch pattern, stitches per inch, size, and type of thread are met, and at least three or more tying, overlapping, or back stitches are used to secu
27、re the ends of stitching. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-44022B 3.4.5 Thread ends. All threads ends shall be trimmed to a length of not more than 1/4 inch. 3.4.6 Lubrication of thread. The addition of any lubricant to the pol
28、yester sewing thread prior to or during the sewing operation is prohibited. 3.4.7 Fusing of ends of synthetic webbing. All ends of synthetic webbing shall be fused as specified on Drawing 8-2-663. The apparatus used to fuse the webbing ends shall be capable of providing sufficient heat to provide a
29、smooth edge, The cut ends of the webbing yarns shall be fused together. Fusing of the ends shall be accomplished prior to being assembled for stitching. 3.4.8 Setting of grommet. The hole for setting the grommet in the synthetic webbing shall be prepunched and shall be smaller than the outside diame
30、ter of the grommet barrel. so that the barrel must be forced through the hole, The grommet shall be securely clinched without cutting the adjacent material, There shall be no more than two splits in the grommet barrel. 3.4.9 Replacement of defective components. During the spreading, cutting, and man
31、ufacturing process, components having material defects or damages that are classified as defect in 4.4.2 shall be removed from production and replaced with non-defective and properly matched components, 3.5 Workmanship. The finished retention strap shall conform to the quality of product established
32、 by this specification. 4, QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase order, the contractor is responsible for the performance of all inspection requirements (examinations and tests) as specified herein. Except as otherwise
33、specified in the contract or purchase order, the contractor may rise his own or any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government. The Government reserves the right to perform any of the inspections set forth in th
34、is specification where such inspections are deemed necessary to ensure , supplies and services conform to prescribed requirements. 4.1.1 Responsibility for compliance. All items shall meet all requirements of sections 3 and 5, The inspection set forth in this specification shall become a part of the
35、 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 submitted to the Government for acceptance comply with all requirements af the c
36、ontract. Sampling inspection, as part of manufacturing operations, is an acceptable practice to ascertain conformance to requirements, however, this does not authorize submission of known defective material, either indicated or actual, nor does it commit the Government to accept defective material.
37、5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-44022B 4.1.2 Responsibility for dimensional requirements. Unless otherwise specified in the contract or purchase order, the contractor is responsible for ensuring that all specified dimensions h
38、ave been met. When dimensions cannot be examined on the end item, inspection shall be made at any point, or at all points in the manufacturing process necessary to ensure compliance with all dimensional requirements, 4.2 Classification of inspections. The inspection requirements specified herein are
39、 classified as follows: a. First article inspection (see 4.3) b. Quality conformance inspection (see 4.4) 4.3 First article inspection, When a first article is required (see 3,1 and 6,2), it shall be examined for the defects specified in 4.4.2 and 4.4.3. 4.4 Quality conformance inspection. Unless ot
40、herwise specified, sampling for inspection shall be performed in accordance with MIL-STD-105. 4.4.1 Component and material inspection, In accordance with 4.1, components and materials shall be inspected in accordance with all the requirements of referenced documents unless otherwise excluded, amende
41、d, modified, or qualified in this specification or applicable purchase document. 4.4.2 In-process inspection, Inspection shall be made of the following operations or assemblies to establish conformance with specific requirements. Whenever nonconformance is noted, correction shall be made to the item
42、s affected and to the operation. Items which cannot be corrected shall be removed from production. a. There shall be no lubrication of polyester thread prior to or during sewing Operations (see 3.4.6). b. Holes punched to receive grommets are in compliance with 3.4.8, 4.4.3 End item visual examinati
43、on. The end items shall be examined for the defects listed in table I. The lot size shall be expressed in units of retention straps. The sample unit shall be one retention strap. The inspection level shall be II and the acceptable quality level (AQL), expressed in terms of defects per hundred units
44、shall be 1.5 for major defects and 6.5 for total (major and minor combined) defects. TABLE I. End item visual defects Classification Examine Defect Major Minor Webbing Any hole, cut, or tear Not firmly or tightly woven: edge fr-ayed or scalloped 6 101 20 1 Provided by IHSNot for ResaleNo reproductio
45、n or networking permitted without license from IHS-,-,-MIL-S-44022B TABLE I. End item visual defects (contd) Classification Examine Defect Major Minor Webbing (cont d) Any end of nylon webbing not fused or not fused as specif ied Fastener tape Grommet Seams and stitchings: Open seams O Stitch type S
46、titch tension titches per Any hole, cut, or tear Hooks flattened, broken or missing impairing function Clinched loosely, permitting either component to rotate freely Clinched excessively tight, cutting adjacent material Washer omitted More than two splits in grommet barrel Incorrect size Up to and i
47、ncluding 1/2 inch More than 1/2 inch NOTE: A seam shall be classified as an open seam when one or more stitches joining a seam are broken, or when two or more consecutive skipped or runoff stitches occur. Incorrect stitch type Loose tension, resulting in a loose top or bobbin thread Excessively tigh
48、t tension, resulting in puckering of ma ter ia 1 inch One stitch less than minimum specified minimum specified of maximum specified Two or more stitches less than One or more stitches in excess 7 202 102 103 104 105 106 203 107 204 108 103 205 206 207 110 208 Provided by IHSNot for ResaleNo reproduc
49、tion or networking permitted without license from IHS-,-,-TABLE I. End item visual defects (contd) Classification Exam in e Defect Major Minor Stitching ends Not secured as specified 209 Thread breaks, Thread breaks, or two or more skipped stitches or runoffs stitches overstitched less consecutive skipped or runoff than 1 inch in each direction beyond the defective stitching are NOTE: Thread breaks, or two or more consec
