1、 INCH POUND MIL-DTL-43511D 12 October 2006 SUPERCEDING MIL-V-4351C 16 July 190 DETAIL SPECIFICATION VISORS, FLYERS HELMET, POLYCARBONATE This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers general and perf
2、ormance requirements for curved polycarbonate flyers helmet visors worn by aircrew personnel. 1.2 Classification. The visors will be of the following classes as specified (see 6.2). Class 1 - Clear Class 2 - Neutral Gray Class 3 - Neutral Gray Gradient (Air Force) 2. APPLICABLE DOCUMENTS 2.1 General
3、. The documents listed in this section are specified in sections 3, 4, or 5 of 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 completene
4、ss of this list, document users are cautioned that they must meet all specified requirements documents cited in sections 3, 4, or 5 of this specification, whether or not they are listed. Comments, suggestions, or questions on this document should be addressed to the Commander, Defense Supply Center
5、Philadelphia, ATTN: DSCP-FQSE, 700 Robbins Avenue, Philadelphia, PA 19111-5092 or e-mailed to Kathleen.Gulliferdla.mil. Since contract information can change, you may want to verify the currency of this address information using the ASSIST Online database at http:/assist.daps.dla.mil. AMSC N/A FSC 8
6、415 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-43511D 2 2.2 Government documents. 2.2.1 Specifications, standards, and handbooks. The following specificati
7、ons, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract (see 6.2). DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-E-12397 Eraser, Rubber-Pumice (for Testing Coated O
8、ptical Elements) DEPARTMENT OF DEFENSE STANDARDS MIL-STD-662 V50Ballistic Test For Armor MIL-STD-810 Environmental Engineering Considerations and Laboratory Tests (Copies of these documents are available online at http:/assist.daps.dla.mil or from the Standardization Documents Order Desk, 700 Robbin
9、s Avenue, Building 4D, Philadelphia, PA 19111-5094.) 2.2.2 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 of these documen
10、ts are those cited in the solicitation or contract. DRAWING 7680606 Tester, Abrasion, Optical Coating 2.3 Non-Government publications. The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the
11、 solicitation or contract (see 6.2). AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI) ANSI Z87.1 Occupational and Educational Personal Eye And Face Protection Devices (Copies of this document are available from www.ansi.org or the American National Standards Institute, 25 West 43rd St., 4thFloor, New Yo
12、rk, NY 10036.) ASTM International ASTM F 735 Standard Test Method for Abrasion Resistance of Transparent Plastics and Coatings Using the Oscillating Sand Method ASTM D 1003 Standard Test Method for Haze and Luminous Transmittance of Transparent Plastics Provided by IHSNot for ResaleNo reproduction o
13、r networking permitted without license from IHS-,-,-MIL-DTL-43511D 3 ASTM D 1044 Standard Test Method for Resistance of Transparent Plastics to Surface Abrasion ASTM D 3935 Standard Specification for Polycarbonate (PC) Unfilled and Reinforced Materal ASTM D 3359 Standard Test Method for Measuring Ad
14、hesion by Tape Test (Copies of these documents are available from www.astm.org or the ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.) AMERICAN SOCIETY FOR QUALITY ANSI/ASQ Z1.4 Sampling Procedures and Tables For Inspection by Attributes (DoD adopted) (Copies of this doc
15、ument are available from www.asq.org or the American Society for Quality, 600North Plankinton Ave., Milwaukee, WI 53203-2914 or www.ansi.org or the American National Standards Institute, 25 West 43rd St., 4thFloor, New York, NY 10036.) INTERNATIONAL COMMISSION ON ILLUMINATION (CIE) CIE 1924 Standard
16、 (Copies of these documents are available from www.cie-usnc.org or the CIE/USA Publications Office, c/o TLA-Lighting Consultants, Inc., 7 Pond St., Salem, MA 01970.) 2.4 Order of precedence. In the event of a conflict between the text of this document and the references cited herein (except for rela
17、ted specification sheets), the text of this document takes precedence. Nothing in this document however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 First article. When specified (see 6.2), a sample shall be subjected to first article
18、 inspection in accordance with 4.2. 3.2 Design and dimensions. The design and dimensions of the visor shall be as specified in the end item specification, drawing or contract as applicable. 3.3 Materials and components. Unless otherwise specified in the end item specification, drawing, or contract a
19、s applicable, the visor shall be fabricated from bisphenol type polycarbonate plastic molding material conforming to ASTM D 3935. All other material and components used in the construction of the visor shall be as specified in the end item specification, drawing, or contract, as applicable. 3.3.1 Re
20、cycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally preferable materials should be used to the maximum extent possible provided that the material meets or exceeds the operational and maintenance requirements, and promotes economically advantageous life
21、 cycle costs. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-43511D 4 3.4 Areas of vision. Unless otherwise specified, the visor shall have three areas of vision which are identified as: outside the area of vision (no optical requirement), n
22、on-critical area of vision, and critical area of vision. The center point for the right and left optics shall be identified as point “C”. The location of point “C” and the location and size of the three areas of the visor identified above shall be as specified in the end item specification, drawing,
23、 or contract as applicable. The critical area is approximately a 50 degree radius field of view from the primary line of sight intercept point on the visor for the designed right and left eye locations. The areas within 1 mm (1/16“) of the edges of the visor are non-critical areas. Regions that rest
24、 against the helmet shell are outside the area of vision. Figure 1 shows a typical layout of a visor and is intended to serve as a guide only for use by Government agencies to develop their detailed requirements. Unless otherwise specified in the end item specification, drawing, or contract as appli
25、cable, the numbered circles within the critical areas are designated as points of choice for prismatic and distortion tests. Points bearing the same number, for example 5R and 5L, shall be compared with each other, except points 2R and 2L (outermost points on left and right sides of visor) shall be
26、compared with point 3 (center point of visor) when measuring refractive power or prismatic deviations. 3.5 Performance. 3.5.1 Prismatic deviation. Prismatic deviation stated herein includes the inherent prismatic power resulting from nonparallel surfaces of the material and dissimilar curvature betw
27、een the critical areas. The vertical and horizontal prismatic deviations shall be tested as specified in 4.3.5. 3.5.1.1 Vertical prismatic deviation. The vertical prismatic deviation through point “C” for the left and right eyes shall be no more than 0.18 prism diopters. The vertical prism along any
28、 individual line of sight through the critical area shall not exceed 0.25 prism diopters. 3.5.1.2 Horizontal prismatic deviation. The horizontal prismatic deviation through point “C” for the left and right eyes shall be no more than 0.18 prism diopters BASE IN and no more than 0.25 diopters BASE OUT
29、. The horizontal prism along any individual line of sight through the critical area shall not exceed 0.25 prism diopters. 3.5.2 Refractive power. The refractive power shall not exceed plus or minus 0.125 diopters at point “C” and at all other points of choice for the left and right optics, when test
30、ed as specified in 4.3.5. 3.5.3 Luminous transmittance (see 6.5) 3.5.3.1 Class 1 visor. The luminous transmittance of class 1 visor shall be not less than 85 percent throughout the critical area when tested as specified in 4.3.5. 3.5.3.2 Class 2 visor. The luminous transmittance of class 2 visor sha
31、ll be within 12 to 18 percent when measured at point “C”, left and right optics. The total visible transmittance of the visor shall not vary more than 3.0 percentage points. Tests shall be as specified in 4.3.5. 3.5.4 Optical density. 3.5.4.1 Class 3 visor. The optical density (OD) of the class 3 vi
32、sor shall be between 0.83 and 0.60 OD when measured at point “C” left and right optics. The OD at any point in a horizontal meridian of a given visor shall not vary by more than 0.1 OD from other points on the same meridian. The class 3 visor shall consist of a class 1 visor with a gradient tint, da
33、rker at the top, conforming to an OD gradient of 0.4 OD/inch + 0.06 OD when measured at point “C” to a Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-43511D 5 vertical distance of 1-inch above or below point “C”. The resultant gradient shall
34、 be smooth and uniform when tested as specified in 4.3.5. 3.5.5 Optical distortion of critical areas. The optical distortion within the critical vision areas shall conform to the acceptable standards shown on figure 2 when tested as specified in 4.3.5. 3.5.6 Haze. The haze value of the visor shall n
35、ot exceed 2.0 percent when tested as specified in 4.3.5. 3.5.7 Ultraviolet transmittance. The erythemal ultraviolet transmittance shall not be more than 1.00 percent, when computed as the average spectral transmittance at wavelengths of 290, 300, 310, and 320 nm when tested as specified in 4.3.5. 3.
36、5.8 Neutrality of class 2 and 3 visors. The spectral transmittance (see 6.6) of the class 2 visor may vary with wavelengths between 430 and 730 nm, the average percentage deviation within nine spectral bands shall be less than 12 when tested as specified in 4.3.5. The spectral distribution curve sha
37、ll show a reasonable even distribution throughout the visible spectrum to insure that color distortion will not be excessive. The neutrality of the class 3 visor shall conform to the requirements specified for the class 2 visor except that the average percentage deviation shall be less than 20 when
38、tested as specified in 4.3.5. 3.5.9 Chromaticity of class 2 and 3 visors. The chromaticity coordinates x and y of the classes 2 and 3 visors shall be within the limits indicated on figure 3 when computed as described in 4.3.5. 3.5.10 Ballistic resistance. The ballistic resistance of the lenses shall
39、 be such that they will pass a V0test using a 0.22 caliber, 17.0 + 0.5 grain, T37 shaped projectile at a velocity of 550 to 560 feet per second when tested as specified in 4.3.5. 3.5.11 Abrasion resistant coating . After being subjected to the abrasion tests specified in 4.3.5 , the increase in haze
40、 shall not exceed 2 percent and the decrease in transmittance shall not exceed 2 percent. 3.5.12 Bayer abrasion resistance. After being subject to the Bayer abrasion test the Bayer ratio shall exceed a value of 4.0 or higher as specified in 4.3.5. 3.5.13 Coating adhesion. Before and after humidity e
41、xposure, the visor shall show no loss of coating when tested in accordance with 4.3.5. 3.5.14 Weathering resistance. The coated visors shall show no yellowing or other changes, nor show loss of coating when tested as specified in 4.3.5. 3.5.15 Chemical resistance. When tested in accordance with 4.3.
42、5 the visor shall not increase more than 2% for transmittance and haze. 3.6 Workmanship. The visors shall be free from all defects which would affect proper functioning in service. The visors shall conform to the quality and grade of product established by this specification. 4. VERIFICATION 4.1 Cla
43、ssification of inspections. The inspection requirements specified herein are classified as follows: a. First article inspection (see 4.2) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-43511D 6 b. Conformance inspection (see 4.3) 4.2 First a
44、rticle inspection. When a first article is required (see 3.1), it shall be examined as specified in 4.3.3 and 4.3.4 and tested for the characteristics specified in 4.3.5. Any nonconformance shall be cause for the rejection of the first article. The number of units to be inspected shall be specified
45、in the contract. 4.3 Conformance inspection. Unless otherwise specified, sampling for inspection shall be performed in accordance with ASQ-Z1.4. Items shall be examined as specified in 4.3.3 and 4.3.4 and tested for the characteristics specified in 4.3.5. 4.3.1 Inspection lots. For purposes of sampl
46、ing, a lot shall consist of visors produced from a single batch of resin during one continuous injection molding operation. Any shutdown of the molding operation shall be considered as the termination of that operation and lot. 4.3.2 Component and material inspection. Components and materials shall
47、be inspected in accordance with all the requirements of referenced documents unless otherwise excluded, amended, modified, or qualified in this specification or applicable purchase document. 4.3.3 End item visual examination. The end item shall be examined for the defects listed in Table I. The lot
48、size shall be expressed in units of visors. The sample unit shall be one visor. TABLE I. End item visual defects Examine Defect Classification Critical Major Minor Appearance Pit, bubble, scratch, foreign matter, void, inclusions or blister: - Critical area of vision 1 - Non-critical area of vision
49、101 - Area outside area of vision 201 Cloudiness: - Critical area of vision 2 - Non-critical area of vision 102 Crack, hole, chip, or break: - Any area 3 - Evidence of warpage 4 Visible striae or waviness: - Critical area of vision 5 - Non-critical area of vision 103 Surface abraded, dulled, or not smooth: - Critical area of vision 6 - Non-critical area of vision 104 Provided by IHSNot for ResaleNo r
