1、 INCH-POUND MIL-DTL-44117B 21 October 2011 SUPERSEDING MIL-H-44117A 22 December 1986 MILITARY SPECIFICATION HELMET, COMBAT VEHICLE CREWMAN, BALLISTIC SHELL, (DH-132B) This specification is approved for use by all Departments and Agencies of the Department of Defense (DoD). 1. SCOPE 1.1 Scope. This d
2、ocument covers the requirements for the DH-132B combat vehicle crewmans (CVC) helmet consisting of a ballistic shell and an inner helmet with attached microphone headset (see 6.9). 1.2 Classification. The helmet will be available in the following sizes as specified (see 6.2). 1.2.1 Complete Helmet A
3、ssembly (see Drawing 8-2-600) 1.2.1.1 Sizes. Small - Small inner helmet with Medium shell Medium - Medium inner helmet with Medium shell Large - Large inner helmet with Large shell 1.2.2 Individual subassemblies. When needed individual subassemblies will be available as replacement parts as specifie
4、d below (see 6.2). Outer Helmet Assembly - (see Drawing 8-2-601) Inner Helmet Assembly (liner minus pads) - (see Drawing 8-2-602-3) Inner Helmet Assembly (liner with pads) - (see Drawing 8-2-618) Attachment Tab Assembly - (see Drawing 8-2-604) Comments, suggestions, or questions on this document sho
5、uld be addressed to Attn: DLA Troop Support Standardization Team, 700 Robbins Avenue, Philadelphia, PA 19111-5096. Since contact information can change, you may want to verify the currency of the address information using Acquisition Streamlining and Standardization Information System (ASSIST) onlin
6、e database https:/assist.daps.dla.mil/ AMSC N/A FSC 8470 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-44117B 2 Buckle Assembly (also comes with inner helmet assembly) - (see Drawing 8-2-605) Chin Strap Pad Assembly (comes with inner helmet
7、 assembly) - (see Drawing 8-2-611) Chinstrap Assembly - (see Drawing 8-2-603) Pads (also comes with inner helmet assembly) - (see Drawing 8-2-618) Earcup seals (see Contracting Activity) 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in Sections 3, 4 or 5 of
8、this specification. This section does 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 this list, document users are cautioned that they must meet all specified
9、 requirements of documents cited in Sections 3, 4 and 5 of this specification whether or not they are listed. 2.2 Government documents. 2.2.1 Specifications, Standards and Handbooks. The following specifications, standards and handbooks form a part of this document to the extent specified herein. Un
10、less otherwise specified, the issues of these documents are those listed in the solicitation or contract. FEDERAL STANDARDS FED-STD-595/34094 Camouflage Green 483 DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-DTL-32075 - Label: For Clothing, Equipage, and Tentage (General Use) MIL-DTL-44050 - Cloth, Ball
11、istic, Aramid MIL-DTL-46593 - Projectile, Calibers .22, .30, .50 and 20MM Fragment-Simulating MIL-DTL-64159 - Camouflage Coating, Water Dispersible Aliphatic Polyurethane, Chemical Agent Resistant DEPARTMENT OF DEFENSE STANDARDS MIL-STD-662 - V50 Ballistic Test for Armor (Copies of these documents a
12、re available online at https:/assist.daps.dla.mil/quicksearch/ or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) 2.2.2 Other Government documents, drawings, and publications. The following other Government documents, drawings, and publica
13、tions form a part of this document to the extent specified herein. Unless otherwise specified, the issues are those cited in the solicitation or contract. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-44117B 3 DRAWINGS U.S. ARMY RESEARCH, D
14、EVELOPMENT, AND ENGINEERING CENTER 8-2-57 CVC Helmet,Wiring Diagram, Test Set 8-2-600 CVC Helmet, DH-132B Assembly (includes 8-2-601 this shall be accomplished before finishing. There shall be no delamination of the shell material greater than 0.125 inch as a result of the drilling operation. 3.6.2
15、Stitching. All stitching be in accordance with ASTM D 6193 and shall be as specified in Drawing 8-2-602 and as specified in 3.6.3, 3.6.4, 3.6.5, and 3.6.6. 3.6.3 Type 301 stitching. Unless otherwise specified, ends of all stitching shall be backstitched or overstitched 1/2 inch minimum, except where
16、 ends are turned under in a hem or held down by other stitching. Thread tension shall be maintained so that there will be no loose stitching resulting in loose bobbin or top thread, or no excessively tight stitching resulting in puckering of the sewn materials. The bottom and top thread interlock sh
17、all be embedded in the sewn materials. 3.6.3.1 Repairs of type 301 stitching. Repairs of type 301 stitching shall be as follows: a. When a thread break or bobbin run-out occurs during sewing, the stitching shall be repaired by restarting the stitching a minimum of 1/2 inch back from the end of the s
18、titching. 1/ b. Any thread break, 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 1/2 inch in back of the defective area, continue over the defective area,
19、and continue a minimum of 1/2 inch beyond the defective area onto the existing stitching. Loose or excessively tight stitching shall be repaired by removing the defective stitching, without damaging the materials, and re-stitching in the required manner.1/ 1/ When making the above repairs, the ends
20、of the stitching are not required to be backstitched. 3.6.4 Bartacking. Unless otherwise specified, bartacks, if used, shall be 3/4 (1/16) inch long, 1/8 (1/32) inch wide, and contain 42 stitches per bartack. Bartacking shall be free of thread breaks and loose stitching. 3.6.5 Automatic stitching. A
21、utomatic 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 secure the ends of the stitching. 3
22、.6.6 Thread ends. All thread ends shall be trimmed to a length of not more than 1/4 inch. 3.6.7 Setting of snap fasteners. On all textile and leather components, the holes punched before inserting the male or female part of the snap fasteners shall be smaller than the outside diameter of the fastene
23、r barrel so that the barrel must be forced through the hole. The fasteners Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-44117B 12 shall be securely clinched without cutting the adjacent material, and no more than two splits shall occur in
24、the button on the eyelet barrel. 3.6.8 Finish of hardware. Hardware components specified to be finished black on the applicable drawings shall be uniformly coated and free from flaking. 3.6.9 Finish of helmet shell and attachment of edge beading. 3.6.9.1 Outside surface preparation. Prior to attachm
25、ent of edge beading and application of protective coating, all permissible surface gaps and pits on the outside surface of the helmet shell shall be filled with epoxy resin composition to provide a smooth and continuous surface. Cutting and filling of blisters of any size shall not be permitted. The
26、 outside surface of the shell shall be prepared for coating as required in order to meet the performance requirements specified in 3.7.7. If abrasion is included in surface preparation, abrading to the point where the aramid cloth fibers become visibly cut and raised shall be prohibited and dust fro
27、m the abrading operation shall be completely removed before application of the coating. The prepared surface shall not be allowed to become contaminated by oil, grease, dust or other foreign matter prior to coating. 3.6.9.2 Attachment of edge beading. The edge beading shall be attached to the helmet
28、 shell as specified on Drawing 8-2-601 and 8-2-607. The beading shall be attached after the outside surface of the helmet shell has been prepared for finishing as specified in 3.6.9.1. 3.6.9.3 Coating of helmet shell outer surface. Following the surface preparation specified in 3.6.9.1 and attachmen
29、t of edge beading specified in 3.6.9.2, the coating specified in 3.5.3 shall be applied to the outside surface of the helmet shell. The coating shall completely and uniformly cover the shell surface. A second coat of the same coating containing the texturing aggregate specified in 3.5.4 shall be app
30、lied uniformly on the outside surface of the helmet shell. The coating shall not be applied to the edge beading. The finishing equipment shall be capable of applying the texturing aggregate coating mixture without settling of the texturing aggregate, clogging of nozzle or lines, or other condition t
31、hat would produce a non-uniform appearance. 3.6.10 Earcups. Seals shall be replaceable and manufactured from polyurethane film. 3.7 Performance 3.7.1 Ballistic resistance. The V50 ballistic limit for each helmet shell shall be not less than 2,150 feet per second when tested as specified in 4.4.5. 3.
32、7.2 Impact resistance. The helmet assembly shall not transmit an impact energy impulse to a standard head form accelerometer in excess of 75 g-force when tested as specified in 4.4.5. 3.7.3 Sound attenuation. The helmet assembly shall meet the minimum acoustical attenuation values listed in Table I
33、when tested as specified in 4.4.5. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-44117B 13 TABLE I. Sound attenuation Octave band center frequency (Hz) Real ear attenuation (dB) 125 14 250 16 500 21 1,000 23 2,000 28 3,150 35 4,000 35 6,300
34、 35 8,000 30 3.7.4 Adhesion of the shell edge beading before aging. The edge beading shall remain firmly bonded to the shell when tested as specified in 4.4.5. Unbonded areas up to a total of two inches in length are acceptable, providing no individual unbonded area is more than 1/2 inch in length a
35、nd 1/8 inch in width. There shall be a minimum distance of 1/2 inch between any two unbonded areas. 3.7.5 Adhesion of the shell edge beading after aging. When tested as specified in 4.4.5, the edge beading shall not peel back more than 1/4 inch from the helmet shell. 3.7.6 Communication equipment op
36、eration. When communication equipment (headset-microphone assembly) is specified in the contract or solicitation, it shall function satisfactorily after installation in the helmet, when tested as specified in 4.4.5. 3.7.7 Water immersion. The coating on the outside surface of the helmet shell shall
37、show no evidence of softening, peeling, or blistering when tested as specified in 4.4.5. 3.8 Repairs. Except as otherwise specified herein, repairs to the helmet assembly shall not be permitted. 3.9 Replacement of defective components. During the spreading, cutting, and manufacturing process, textil
38、e and leather components having material defects or damages that are classified as defects in 4.4.2.4, 4.4.2.5 and 4.4.3 shall be removed from production and replaced with nondefective components. 3.10 Workmanship. The finished helmet assembly shall conform to the quality of product established by t
39、his specification. The occurrence of defects shall not exceed the acceptable quality limits as specified in the contract and/or order, except where otherwise indicated (see 6.2). 4. VERIFICATION 4.1 Classification of inspections. The inspection requirements specified herein are classified as follows
40、: a. First article inspection (see 4.2). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-44117B 14 b. Conformance inspection (see 4.3). 4.2 First article inspection. A first article inspection shall be performed on the item (completed helmet
41、assembly or subassembly) as specified in the procurement document (see 6.2). The first article inspection shall be unacceptable if the requirements in Table II are not met. TABLE II. First article inspection Inspection Requirement Verification Visual examination (completed helmet assembly as noted)
42、3.2, 3.3.2, 3.5.3, 3.5.6.1, 3.5.6.2, 3.5.6.3, 3.5.6.4, 3.6.2, 3.6.3, 3.6.4, 3.6.6, 3.6.8, 3.6.10, 3.8, 3.9, hole locations 2/; hole diameters, peripheral contour 3/; and inside, height dimensions 4/ conform to the dimensional requirements specified on Drawing 8-2-830. Any of these dimensions exceedi
43、ng the specified tolerance shall be classified as a defect 5/. The lot shall be expressed in units of helmet shells of Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-44117B 17 one size only. The sample unit shall be one helmet shell after dr
44、illing of holes (without edge beading). The inspection level shall be in the contract (see 6.2). 1/ The thickness of the helmet shell shall be measured to the nearest 0.001 inch at five different locations. One measurement shall be taken at the approximate top center of the helmet and the other four
45、 measurements shall be taken in the approximate center of each of the four quadrants not less than 3-1/2 inches from the top center. All five measurements shall be averaged. If the averaged thickness is not within tolerance, it shall be scored as a defect. 2/ Reference Drawing 8-2-830. Chord dimensi
46、ons between holes, taken from the inside of the helmet shell, shall be checked and any failure to conform to any of the dimensions specified on Drawing 8-2-830 shall be scored as a defect. Dividers should be used in measuring the chord distance from the bottom of the holes to the bottom of the holes
47、 involved. 3/ The peripheral contour dimensions shall be checked by measuring the inside length of the helmet between the points at 0 and at 180 as shown on Drawing 8-2-830. The inside width shall be measured between the points at 90 and 270 as shown on Drawing 8-2-830. Any failure to conform to any
48、 of the dimensions specified on Drawing 8-2-830 shall be scored as a defect. 4/ If all ten benchmarks appear on the helmet shell, the measurement of the height dimension is not necessary. 5/ Reference Drawings 8-2-658 pimple, or blister Any evidence of cracking Seriously affecting appearance or serv
49、iceability. Not seriously affecting appearance or serviceability Any evidence of dry spot, any area of non-resin flow or other molding deficiency Seriously affecting appearance or serviceability. Not seriously affecting appearance or serviceability Any cloth gap, any pit except those specified as permissible (see 3.6.1.1.1, 3.6.1.1.2, and 3.6.1.2) A
