1、MIL-H-43 925D SUPERSEDING MIL-H-43 925C 30 September 1986 (See 6.7) 27 April 1988 MILITARY SPECIFICATION HELMET, FLYERS, PROTECTIVE, SPH-4 This specification is approved for use by all Departments and Agencies of the Department of Defense. 1, SCOPE 1.1 Scope. This document covers the SPH-4 flyers pr
2、otective helmet. * 1.2 Classification. The helmets shall be of the following sizes (see 6.2). Sizes: Sma Il Regular X-Large 2. APPLICABLE DOCUMENTS 2.1 Government documents. i * 2.1.1 Specifications, standards, and handbooks. The following specifi- cations, standards, and handbooks form a part of th
3、is specification to the extent specified herein. Unless otherwise specified, the issues of these documents shall be those listed in the issue of the Department of Defense Index of Specifications and Standards (DODISS) and supplement thereto, cited in the solicitation. SPECIFICATIONS FEDERAL L-P-378
4、- Plastic Sheet and Strip, Thin Gauge, Polyolefin DDD-L-2 O - Label: For Clothing, Equipage, and Tentage (General Use) AMSC NfA FSC 8415 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. Beneficial comments (recommendations, additions, deletions) and any pertinent dat
5、a which may be of use in improving this document should be addressed to: U.S. Army Natick Research, Development, and Engineering Center, Natick, MA 10760-5014 by using the sel-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by let ter.
6、Licensed by Information Handling ServicesMIL-H-LJ3925D BLJ W 9999906 0377087 T-h MIL-H-43925D PPP-B-636 - Boxes, Shipping, Fiberboard PPP-T-60 - Tape, Packaging, Waterproof PPP-T-76 - Tape, Pressure Sensitive Adhesive, Packaging/Paper (Far Carton Sealing) MIL I TARY MIL-P-116 - Preservation, Methods
7、 of MIL-L-35078 - Loads, Unit: Preparation of Semiperishable Subsistence Items; Clothing, Personal Equipment , and Equipage; General Specification For MIL-V-43511 - Visor, Flying Helmet, Po1.ycarbonate MIL-A-46106 - Adhesive-Sealants, Silicone, RTV, General Purpose MIL-H-49225 - Headset Microphone K
8、it MK 896A/AIC (Components of) STANDARDS MILITARY MIL-STD-105 - Sampling Procedures and Tables for Inspection by Attributes MIL-STD-129 - Marking for Shipment and Storage MIL-STD-147 - Palletized Unit Loads (Copies of specifications, standards, and handbooks required by contractors in connection wit
9、h specific acquisition functions should be obtained from the contracting activity or as directed by the contracting activity.) ff 2.1.2 Other Government documentsy drawings, and publications. The following other Government documents, drawings, and publications form a part of this specification to th
10、e extent specified herein. Unless otherwise specified, the issues shall be those in effect on the date of the solicitation. JOINT COMMITTEE ON PRINTING (JCP) PUBLICATIONS Government Paper Specification Standards (Copies may be obtained from the Superintendent of Documents, U.S. Government Printing O
11、ffice, Washington, DC 20402.) DRAWINGS U.S. ARMY NATICK RESEARCH, DEVELOPMENT, AND ENGINEERING CENTER 8-2-48 1 - Helmet, Flyers, Protective, SPH-4; Spacer, Visor 8-2-523 - Visor Lock Assembly 8-2-524 - Packaging of Helmets 8-2-800 - Helmet, Flyers, Protective, SPH-4 Assemblies Housing 2 Licensed by
12、Information Handling Services- MIL-H-Ll3725D 84 W 999770b 0397088 L 8-2-803 8-2-804 8-2-8 12 8-2-8 14 8-2-8 15 8-2-8 17 8-2-818 8-2-821 8-2-825 8-2-827 8-2-832 8-2-833 8-2-834 8-2-835 8-2-839 8-2-840 8-2-84 1 8-2-853 8-2-855 8-2-856 8-2-85 7 8-2-858 8-2-859 8-2-860 8-2-862 8-2-863 8-2-864 8-2-866 8-
13、2-897 MI L-H- 4 3 9 25D Shell, Small/Regular . Shell, X-Large Earcup Retainer Assembly Earcup Retention Cross Strap Assembly Chinstrap Assembly Post Slotted Post Clip Testing of Chinstrap (When Procured Separately) Pad Testing of Earcup Retainer Eyelet Chape Testing of Earcup Retainer (Wien Procured
14、 Separately) Hook Clip Body Pattern Ring Assembly Reinforcement Extens ion, Body Pad Assembly Body Slide Cushion Backing Retainer Spacer Cushion, Inner Cushion, Earpad Button, Earpad Ring, Connector Cover Earpad Suspension System, Form Fit (Copies of drawings, publications, and other Government docu
15、ments required by contractors in connection with specific acquisition functions should be obtained from the contracting activity or as directed by the contracting activity.) 2.2 Other publications. The following documents form a part of this document to the extent specified herein. Unless otherwise
16、specified, the issues of the documents which are DOD adopted shall be those listed in the issues of the DODISS specified in the solicitation. Unless otherwise specified, the issues of documents not listed in the DODISS shall be the issues of the nongovernment documents which are current on the date
17、of the solicitation. AMERICAN NATIONAL STANDARDS INSTITUTE, INC. S12.6/ASA 55 - Method For Measurement of the Real-Ear Attenuation of Hearing Protectors Z90.lb-1979 - Specification for Protective Headgear for Vehicular Users (Application for copies should be addressed to the American National Standa
18、rds Institute, Inc., 1430 Broadway, New York, NY 10018.) 3 Licensed by Information Handling Services-_- - _._ MIL-H-43725D 84 777770b 0377087 3 9 AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) D 3951 - Standard Practice for Commercial Packaging (Application for copies should be addressed to the A
19、merican Society for (Nongovernment standards and other publications are normally available from the organizations which prepare or which distribute the documents. documents also may be available in or through libraries or other informational services. ) Testing and Materials, 1916 Race Street, Phila
20、delphia, PA 191O3.1 These 2.3 Order of precedence, 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. Nothing in this specification, however, shall supersede applicable laws and regulations unless a
21、 specific exemption has been obtained. 3, REQUIREMENTS 3.1 First article. When specified in the contract or purchase order, a sample shall be subjected to first article inspection (see 4.3, 6.2, and 6.4). 3.2 Samples. 3.2.1 Guide-samples. Samples, of the helmet or components, when furnished, are sol
22、ely for guidance and information to the contrector (see 6.3). Variation - from the document may appear in the samples, in which case the document shall govern 3.2.2 Standard color samples. Unless otherwise specified, standard samples for color shall apply (see 6.3). 3.3 Materials and components. Mat
23、erials and components shall be as specified on the applicable drawings and as specified herein (see 6.6). For materials or components for which it is stated “or equal“, if the contractor proposes to use an item considered to be equal to the material or component specified, prior to its use the contr
24、actor shall furnish a sample o the material or component, with supporting data to the contracting officer for subsequent evaluation by the responsible military agency. functional equivalence and design compatibility of the item proposed to be used. The supporting data required shall prove the 3.3.1
25、Adhesives. The adhesives shall be applied to the helmet components in a manner that will not degrade the liners or affect the finish of any helmet component. 3.3.1.1 Rubber edging. The adhesive for bonding the rubber edging of the helmet shall meet the bonding requirements specified in 3.5.3 and 3.5
26、.4. 4 Licensed by Information Handling ServicesMI L-H-439 25D 3.3.2 Instruction manual. An instruction manual shall be furnished by the contractor with each helmet. The manual shall be placed into the suspension of the completed helmet. The printing, collation, folding, and stitching of the manual s
27、hall be in accordance with the standsrd sample (see 6.3). shall be antique white book paper conforming to JCP-A-100, 140 pound weight basis 25 by 38 inches per 1000 sheets (see 4.4.1.1). white offset book paper conforming to JCP-A-60, 120 pound weight basis 25 by 38 inches per 1000 sheets (see 4.4.1
28、.1). Each helmet shall have a permanent type idenii- a The cover The text paper shall be I I 3.3.3 Identification label. fication label applied in a permanent manner to the interior surface of the helmet shell located to the rear of the right ear cavity adjacent to the cut out in the helmet liner. T
29、he label shall be white, approximately 1 by 2 inches in size and the characters shall be black, 3/32 inch high minimum. The label shall have the following information: I? I= I o Nomenclature Size Stock No. Contract No. Lot No. Contractor Name 3.3.3.1 Identification labels and markings on components.
30、, When specified on the applicable drawings, components shall have identification labels or mark- ings, as applicable. Unless otherwise specified on the applicable drawing, the identification label for textile components shall conform to type IV, class 5 of DDD-L-20, except the lot number shall be i
31、ncluded in the label contents. For components other than textile, the identification label or marking shall be as specified on the applicable drawing. s: 3.4 Design and construction. The design and construction of the helmet shall be as specified herein, and as shown on Drawing 8-2-800 and all subsi
32、diary drawings and parts lists pertaining thereto. 3.4.1 Stitching. All stitching shall be as specified on the applicable drawings 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 ex
33、cessively tight stitching resulting in puckering of the materials sewn. The lock shall be embedded in the materials sewn. 3.3.3 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 repa
34、ired by restarting the stitching a minimum of 1/2 inch back of the end of tne stitching. L/ 5 Licensed by Information Handling Services- - flIL-H-93925D 84 W 9999906 0397093 I a MI L-H-439 25D b. Any thread break or two or more consecutive skipped or runoff stitches noted during inspection of the it
35、em (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, and continue a minimum of l/Z inch beyond the defective area onto the existing stitching. excessively tight stitching shall
36、 be repaired by removing the defective stitching, without damaging the materials, and restitching in the required manner. L/ - i/ Loose or When making the above repairs, the ends of the stitching are not required to be backstitched, 3.4.4 Automatic stitching. Automatic machines may be used to perfor
37、m 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. 3.4.5 Thread ends. All thread ends shall be trimmed
38、 to a length of not more than 1/4 inch. 3.4.6 Setting of eyelets and grommets. A hole shall be prepunched to receive the eyelet and grommet. The hole shall be smaller than the outside diameter of the eyelet or grommet barrel so that the barrel must be forced through the hole. The eyelets and grommet
39、s installed in the chinstrap and earcup retainer shall meet the performance requirements specified in 3.5,9, 3.5.10, and 3.5.11. The hole shall not be punched in the setting operation with the eyelet or grommet barrel. The eyelets and grommets shall be securely clinched without splitting and in a ma
40、nner that will prevent rotation of the eyelets and grommets freely within the webbing, detachment of the eyelets and grommets from the webbing, or cutting of the adjacent material (see 3.5.9 and 3.5.10). The minimum inside diameter of the eyelet hole after clinching shall be as specified on the appl
41、icable drawing. Unless otherwise specified, the washer may be on either side of the components on which installed. e 3.4.7 Setting of snap fasteners. A hole shall be prepunched to receive the button and eyelet components of the snap fasteners. The hole shall be smaller than the outside diameter of t
42、he button and eyelet barrels so that the barrel must be forced through the hole. The hole shall not be punched in the setting operation with the button or eyelet barrel. The fasteners shall be securely clinched without cutting the adjacent materials, such that the ends of the barrels of the button a
43、nd eyelet components are completely rolled back (see 3.5.9 and 3.5.10). 3.4.8 Fusing of ends of nylon webbing. Unless otherwise specified, all ends of nylon webbing shall be fused. The apparatus used to fuse the webbing ends shall be capable of providing sufficient heat to provide a smooth edge with
44、 the cut ends of the webbing yarns all fused together. Fusing of the webbing ends shall be accomplished prior to being assembled for stitching. 6 e Licensed by Information Handling ServicesMI L-H-439 25D I I ! 3.4.9 Dipping of ends of elastic webbing. All ends of elastic webbing shall be dipped in a
45、 melted mixture of 50 percent beeswax and 50 percent paraffin to a depth of 3/16 f 1/16 inch, - -b 20F. Temperature of the melted mixture shall be 180 The dipped ends shall have a smooth and even appearance. 3.4.10 Finish. 3.4.10.1 Hardware. Hardware components specified to be finished black on the
46、applicable drawings shall be uniformly coated and free from flaking. +: 3.4.10.2 Helmet shell, The entire exterior surface of the helmet shell shall be coated with the coating specified on Drawing 8-2-800. either air-dried or force-dried prior to attachment of rubber edging and screws. The dried fin
47、ish shall be uniform in color and luster over the entire exterior surface of the shell. The final finish shall be free of sags, runs, wrinkles, blistering, or other defects either of improper application or of cure of the coating. The coat-ing shall be 3.4.11 Assembly of helmet, The helmet and helme
48、t components shall be assembled as specified on the applicable drawings and as specified below. The contractor is not required to follow the assembly instructions in the exact sequence shown. 3.4.11.1 Visor assembly. The front edge of the visor housing shall not project below the lower bound edge of
49、 the helmet. and the housing shall be sufficient to enable the visor to be raised and lowered without touching the housing except at the left and right edges 3/4 inch maximum from edges of visor, used The space between the visor If interface does occur, the specified spacers shall be 3.4.11.2 Communications assembly. a, b. Insert female connector into connector retainer clip with bottom edge Use headset microphone kit, MK 896A/AIC of MIL-H-49225 connector even with bottom edge of retainer clip. Clinch prongs on retainer clip securely around connector. plate and mountin
