1、flIL-DTL-87l174A 777770b 2075578 307 W 9 I INCH-POW I MIL-DTL-87 174AoJSAF) 30 October 1998 SUPERSEDING 25 October 1983 MIL-H-87 174QJSA.F) DETAIL SPECIFICATION HELMET, FLYERS HGU-55P This specification is approved for use by the Department of the Air Force and is available for use by aii Department
2、s and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers the requirements for the HGU-55P flyers helmet. 1.2 Classification. The helmets are provided in the following sizes as specified (see 6.2). Medium Large M L Extra Large XL 2. APPLICABLE DOCUMENTS 2.1 specifica
3、tion. 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 ail specified requirements
4、documents cited in sections 3 and 4 of this specification, weather or not they are listed. General. The documents listed in this section are specified in sections 3 and 4 of this 2.2 Government documents. 2.2,l handbooks form a part of this document to the extent specified herein. Unless otherwise s
5、pecified, the issues of these 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). Specifications, standards. and handbooks. The following specifications, standards, and Benefi
6、cial comments (recommendations, additions, deletions) and any pertinent data that may be of use in improving this document should be addressed to: Technology Buckles - 1 Bar7Type I - 2 Bar, Type 2 2.3 Non-Government publications. The following document(s) form a part of this document to the extent s
7、pecified 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 issues of the documents not listed in the DoDISS are the issues of the documents cited in the solicita
8、tion (see 6.2). AMENCAN NATIONAL STANDARDS INSTITUTE, WC. (ANSI) ANSI Z90.1 Headgear Protective for Motor Vehicular Users Specifications for. (Application for copies should be addressed to the American National Standards Institute, 1 1 West 42nd St. New York, NY 10036.) 3 Provided by IHSNot for Resa
9、leNo reproduction or networking permitted without license from IHS-,-,-flIL-DTL-87174A W 9999906 20755BL 9TL W r MIL-DTL-87 174A(USAF) 2.4 references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a speci
10、fic exemption has been obtained. Order of precedence. In the event of a conflict between the text of this document and the 3. REQUIREMENTS. 3.1 that are authorized by the qualieng activity for listing on the applicable qualified products list before contract award (see 4.3 and 6.4). Oualification. T
11、he HGU-55P helmets furnished under this specification shall be products 3.2 shall comply with the requirements of specifications referenced on the applicable drawings and as specified herein. Materials. The materials used in the fabrication and assembly of the helmet components 3.2.1 Recvcled, recov
12、ered. or environmentally preferable materials. Recycled, recovered, or environmentally preferable materials should be used to the maximum extent possible, provided that the materials meet or exceed the operational and maintenance requirements and promote economically advantageous life cycle cost. 3.
13、2.2 m. The shell shall be a fiberglass cloth and epoxy resin laminate in accordance with MIL-P-2542 1 , Type I, Class 1, laminate cloth base number 18 1 or 18 1-1 50. The shell shall be comprised of 5 plies of reinforcing material that overlap at the centerline. The shell shall be a semi- void-free
14、laminate and shall contain no defects which exceed those defined under 3.6 of MIL-P- 9400. The molded shell shall conform in shape, contour and thickness to 81D5332 for the size medium; 81D5333 for the size large; and 81D5334 for the size extra-large. The thickness ofthe shell shall be within a rang
15、e of 0.035 to 0.050 inch, except that a maximum thickness of 0.095 inch shall be permitted in the area of the laminate where reinforcing material is overlapped. 3.2.3 Fastener pile fabric. The fastener pile fabric used for earcup retention shall be in accordance with Drawing 79B4695. 3.2.4 Edgeroll.
16、 The leather used in the edgeroll shd be sheepskin in accordance with KK-L-254, Type A, Class 1, Subclass A. The foam core used in the edgeroll shall be polyurethane foam (see 6.8). The density shall be 3.5 to 5.0 pounds per cubic foot. The adhesive used in the installation of the edgeroll shall be
17、consistent with Class 2,3, or 5, Neutral Form A or B of MIL-A-5540 (see 6.8). The thread used in the installation of the edgeroll shall be unbleached or white color, and the size and type consistent with A-A-52094. 3.2.5 Energv Absorbing Liner. The energy absorbing liner shall be fabricated fiom exp
18、andable polystyrene plastic foam having a density of 2 - 2.5 pounds per cubic foot (see 6.8). The inner surface (concave side) of the liner shall be coated with white shellac or water thinned white latex coating which will not collapse, soften, or visibly affect the foam structure and which will for
19、m a base for adhesion of the fastener tapes to the liner. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-flIL-DTL-87174A 999990b 2075582 838 W I MIL-D“L-S7174A(USAF) 3.3 with Drawing 81D5330, the subsidiary drawings listed below and their detail d
20、rawings, and the requirements specified herein. Desian and construction. The helmet and its components shall be constructed in accordance DRAWINGS COMPONENTS 79B4695 SOC4782 SOC4784 81B5370 81D5332 81D5333 81D5334 81D5335 Pile Fastener Ear Section Chin Strap, Subassembly Nape Strap, Subassembly, Uni
21、versal Lens Stop Device Helmet Shell, Medium Helmet Shell, Large Heimet Shell, X-Large Patterns. Edgeroll 3.3.1 Visor hardware. The flanged nuts with washers shall be instailed in the visor mounting holes as shown on Drawing 68H274. 3.4 Performance. 3.4.1 Shell finish adhesion. The shell finish coat
22、ing shall adhere to the shell during normal use. 3.4.2 Heat exposure. The helmet assembly shall not change in weight by more than 1 percent, nor shall there be a change in distance between the shell center reference dimples greater than 0.25 inch. No other changes affecting appearance or serviceabil
23、ity and no visible distortion of the components shall take place as a result of the heat exposure of up to 160 -t 27 T. 3.4.3 Penetration resistance. The helmet shell shall withstand an impact of a pointed, 16-ounce steel bob freely dropped from a height of 10 feet. The bob shall have a point having
24、 a maximum radius of 0.015 inches. Penetration shall be less than 0.25 inches when measured from outside the helmet shell. 3.4.4 Impact protection. When an impact of 35 foot-pounds energy is applied to the helmet assembly, acceleration experienced by the headform shall not exceed 150g for more than
25、6 milliseconds, 200g for 3 milliseconds, or 400g. 3.4.5 Windblast protection. The complete helmet assembly shall not loosen or tear away fiom the headform or break during windblast of 450 tr 20 kt. 3.4.6 Fastener tape bond. All fastener tapes shall remain bonded to the liner over at least 75% of the
26、ir total area when tested as specified in 3.2.5 3.5 helmet acquisition (see 6.2), the listed components shaU meet the requirements specified herein and shall compose a complete assembly. Components used with the HGU-5 5/P helmet. When procured as part of the HGU-5 5/P i 5 Provided by IHSNot for Resa
27、leNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-87174A = 999990b 2075583 774 = MIL-DTL-87174A(JS) Thread Size 1 2 3.5.1 Buckles and thread. Buckles shall be a 2-bar design, 0.75 inches wide, and constructed of brass. See Drawing 4-1-54. The buckles shall have a black c
28、hemical finish applied in accordance with established commercial practices (see 6.8). The thread shall be nylon, size 1, black, general purpose, twisted multiple cord (ply) construction, bonded or unbonded with a soft finish. Each of the individual yams shall be twisted initially with not less than
29、6.0 turns per inch (tpi), and in the opposite direction to the final twist. The final plied twist shall be not less than 6.0 tpi. The thread size parameters shall be in accordance with table I. Final Nominal Breaking Elongation Twist Tex Length per force percent Ply (t.p.i.) Number pound (yards) min
30、imum maximum (gknl) pounds * 3 6.0 68 - 76 5,801 - 8,700 9 26 2 or 3 7.0 46 8,701 - 13,000 6 26 TABLE I. Thread Sizes. 3.5.2 Visors. 3.5.2.1 Visor lens coating. The visor lens shall be polycarbonate with optical characteristics in accordance with ME-V-43 5 1 1. The visor lens shall be coated on the
31、fiont and rear surfaces with an abrasion resistant coating in accordance with m-C-83409. 3.5.2.2 Visor assemblv, lightweight (Clear - MBU-l2/P Trim). The lightweight visor assembly (Clear - Mi3U 12/P Trim) shall be in accordance with Drawing 8 1D5 189-3. 3.5.2.3 Visor assemblv. lightweight Neutral G
32、rav - MBU-l2/P Trim). The lightweight visor assembly (Neutral Gray - MBU-12F Trim) shall be in accordance with Drawing 8 1D5 189-4. 3.5.3 Headset assembly. The H-154NAl C headset assembly shall be in accordance with Air Force Drawing 7136036 except that the color of the earcup, earseal, and earcup i
33、nserts shall be black. 3.5.4 Absorbent lier. The absorbent liner shall be in accordance with Drawing 703 60. The fabric used in the construction of the absorbent liner shaU be preshrunk prior to cutting and stitcbing, shall be knitted simplex, Type I, and shall be gray. The thread used in the constr
34、uction of the absorbent liner shall be size 2, nylon, general purpose twisted multiple cord (ply) construction, unbonded with a soft fish. Each of the individual yarns shall be twisted initially with not less than 7.0 t.p.i., and in the opposite direction to the final twist. The final plied twist sh
35、all be not less than 7.0 t.p.i. The thread size parameters shail be in accordance with table I. 3.5.5 Retainer iack. The retainer jack shall be in accordance with Drawing 60B4278. 3.5.6 Pad set. fittings, earcup. The pad set, fittings, and earcup shd be in accordance with Drawing 64A2217-4. 6 Provid
36、ed by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-flIL-DTL-7174A W 7979906 2075584 600 t MIL-DTL-S7174A(USAF) 3 S.7 Bayonet receiver kit. The bayonet receiver kit shall be in accordance with Drawing 82A5614-10. 3.5.8 Lens bag. The lens bag shall be in accord
37、ance with Drawing 79B4402. 3.5.9 Visor lens cover. The visor lens cover shall be in accordance with drawing 82C5701. 3.6 holes cleanly punched or drilled at the required locations. All flash shall be removed. The exterior surface shall be cleaned and smooth. The edge shall be sanded to remove sharp
38、surfaces. The exterior surface shall be primed and then coated with a polyurethane paint in accordance with MIL- PRF-85285 that will meet the adhesion requirements when tested in accordance with 4.5.5. After drying, the paint finish shall be smooth. Finish and color. The molded shell shall be trimme
39、d to the specified edge contour and all 3.6.1 Molded shell. The color of the molded shell shall be gray conforming to 3623 1 of FED-STD-595. 3.6.2 Leather. The leather used in the edgeroll shail be lusterless gray conforming to 26132 of FED-STD-595. 3.7 accordance with the contract (see 6.2). Identi
40、fication of product. Each helmet assembly and components shall be identified in 3 .S Weight. The weight of the complete helmet assembly, consisting of the painted shell, thick leather edgeroll, buffer leather, lens stop devices, fastener pile fabric and snap fasteners (for visor lens attachment), sh
41、all not exceed 1.05 lbs. (475 grams) for size medium, 1.18 lbs. (535 grams) for size large and 1.27 lbs. (575 grams) for size extra large. 3.9 accordance with commonly accepted industrial workmanship standards. Workmanship. All components, parts, and equipment shall be constructed and assembled in 4
42、. VERIFICATION 4.1 follows: Classification of inmection. The testing requirements specified herein are classified as a. Qualification inspection (see 4.3) b. Qudity conformance inspection (see 4.4) 4.2 Inspection conditions. 4.2.1 Atmosuheric conditions. Unless otherwise specified in the individual
43、test, all tests shal be performed .at ambient pressure, at a temperature of 77 OF f 14.5 OF, and at a relative humidity of 70% or less. 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-87174A ob 2075585 547 4.2.2 Items required for windblast
44、 test. The following items are required in conducting the windblast test: a. Mask, Oxygen MBU-12F (MIL-M-87163) b. c. d. e. Headform (see 6.7) Bayonet Receiver Kit (Drawing 82A5614-10) Visor Assembly, Lightweight, MBU-12F (Drawing 8 1D5 189) Thermal Plastic Liner (TPL), PN 84D683 8 4.3 Qualification
45、 inspection. 4.3.1 production equipment and shall be identified with the manufacturers part number and such other information as required by applicable drawings. Qualification test samples. The qualification test samples shall be representative of the 4.3.1.1 HGU-55F helmet assemblies. Unless otherw
46、ise modified by the contract or by the procuring activity (see 6.2), qualification test samples shall be as follows: a. Sample A: (1) (2) (3) One chin strap assembly with installation hardware (Drawing 80C4782). One nape strap assembly with installation hardware (Drawing 80C4784). One molded shell o
47、f each size, trimmed and drilled, painted, and without edgeroll (Drawings 81D5332, 81D5333, and 81D5334). b. Sample B: Two helmet assemblies of each size specified on the contract or purchase order that are completely finished and assembled in accordance with this specification and Drawing 81D5330.
48、c. Sample C: Two helmet assemblies of each size specified on the contract or purchase order that are completely finished and assembled in accordance with this specification and Drawing 81D5330. d. Sample D: Four HGU-55/P helmet assemblies that are completely assembled in accordance with this specifi
49、cation and Drawing 81D5330. The size of these helmets may be medium or large depending upon the size of the windblast test headform required in the conduct of the test. e. Sample E: Two HGU-55P helmet assemblies that are completely assembled in accordance with this specification and Drawing 81D5330. f Sample F: Two HGU-55/P helmet assemblies that are completely assembled in accordance with this specification and Drawing 81D5330. . g. Sample G: Two HGU-55/P helmet assemblies of e
