DRAFT_AB3-Spectacles-Ballistic-Performance_Specification.docx

PRODUCT SPECIFICATION

For Aircrew Laser Eye Protection (ALEP) Block 3 Daytime Spectacles

Prepared by:

AFLCMC/WNU

1981 Monahan Way Wright Patterson AFB, OH 45433

SPECIFICATION DOCUMENT NUMBER: PS-###

22 May 2018

APPROVED FOR USE BY: _____________________

DATE: XX May 2018

DISTRIBUTION STATEMENT D: Distribution authorized to Department of Defense (DoD) and United States (US) DoD contractor(s)s only (Administrative and Operational Use) (8 October 2011). Refer other requests for this document to AFLCMC/WNU, 1981 Monahan Way, Building 12, Wright-Patterson AFB, Ohio 45433.

WARNING – This document contains technical data whose export is restricted by the Arms Export Control Act (Title 22, U.S.C., Sec 2751 et seq.) Executive Order 12470. Violation of these export laws is subject to severe criminal penalties.

Contents

AFLCMC/WNU-##-ALEP PS####

Cage Code: ###### Date: 22 May 2018

AFLCMC/WNU-##-ALEP PS####

Cage Code: ###### Date: 22 May 2018 i ITAR Controlled Technical Data (IAW First Page) Competition Sensitive

ITAR Controlled Technical Data (IAW First Page) Competition Sensitive

SCOPE

This document addresses the product requirements for the Block 3 Aircrew Laser Eye Protection (ALEP) Daytime Spectacle(s). The ALEP spectacle(s) provide aircrew protection against laser devices/systems in combat and training situations while minimizing impact to visual performance. This product specification provides the performance requirements for ALEP Block 3 spectacles.

System Overview Air Force aircrews require an ALEP device for operations that balances requirements for laser eye protection, mission compatibility, and flight safety. The device(s) shall provide protection sufficient to prevent permanent eye damage and protection against the temporary effects of laser weapons/devices. Additionally, the device(s) shall be compatible with the life support equipment specified herein. All cockpit/cabin displays, lights, phosphors and external visual objects such as exterior aircraft lights and airfield lights shall be visible when ALEP is worn.

Spectacles are defined as eyewear that protects the wearer’s eyes from hazards and threats associated with light energy (Type I and Type II) and fragmentation (Type II only).

Classification ALEP Block 3 Daytime Spectacles will be designated into two types of eye protection.

APPLICABLE DOCUMENTS

General Documents identified in this section with an asterisk (*)are specified in either Sections 3 and/ or 4 of this specification. All other documents are for reference only and are utilized as guidance.

Government Documents Specifications, Standards, and Handbooks

* Classified Reference A, “ALEP Block 3 Protection Wavelengths and Optical Densities”, contains classified parameters Aircrew Laser Eye Protection (ALEP) Operational Requirements Document CAF (TAF 505-87-II-A) MIL-PRF-29580C, “Performance Specification, Spectacles, Aviator’s, Multiple Wavelenghth Laser Protective, EDU-5/P (With Case)” 17 September 1998 MIL-PRF-31013, “Performance Specification, Spectacles, Special Protective Eyewear Cylindrical System (SPECS)”, 25 April 1996 MIL-PRF-49506, “Performance Specification, Logistics Management Information”, 11 November 1996 MIL-PRF-32432A, “Performance Specification, Military Combat Eye Protection (MCEP) System”, 28 March 2017

* MIL-STD-130N w/Change 2, “Department of Defense Standard Practice Identification Marking of U.S. Military Property”, 16 November 2012* MIL-STD-662F, “V50 Ballistic Test for Armor”, 18 December 1997

* MIL-STD-810G w/Change 1, “Environmental Engineering Considerations and Laboratory Tests”, 15 April 2014 MIL-C-83409(1), Notice 3, “Coatings, Visor, Polycarbonate, Flying Helmet”, 3 August 1999 MIL-L-85762A, “Lighting, Aircraft, Interior, Night Vision Imaging System (NVIS) Compatible”, 26 August 1988

* MIL-DTL-43511D, “Visors, Flyer’s Helmet, Polycarbonate”, 12 October 2006 Other Government Documents, Drawings and Publications TRD 412A-07878-54104, “Visor, Multiple Wavelength Laser, Protective for Aircrew man’s Helmet”, Oct 1987 ITOP 4-2-805, Projectile Velocity and Time of Flight Measurements (U.S. Army Test and Evaluation Command) TOP 10-2-222, Ballistic Fragmentation Testing of Military Combat Eye Protection (MCEP) Systems (U.S. Army Test and Evaluation Command Test Operations Procedure) Non-Government Publications The following documents form 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 issues of the documents not listed in the DoDISS are the issues of the documents cited in the solicitation (see 6.2).

American Society for Quality Control (ASQC) ASQC-Z1.4 - Procedures, Sampling and Tables for Inspection by Attributes (DoD adopted) (Application for copies should be addressed to the American Society for Quality Control, 611 East Wisconsin Avenue, P.O. Box 3005, Milwaukee, WI 53201-3005)

American Society for Testing and Materials (ASTM)

* ASTM-D1003-13 - Standard Test Method for Haze and Luminous Transmittance of Transparent Plastics, (DoD adopted), 2013 ASTM-D1044-13 - Standard Test Method for Resistance of Transparent Plastics to Surface Abrasion, 2013

* ASTM-D3359-17 – Standard Test Methods for Measuring Adhesion by Tape Test, 2017 ASTM-D3935-15 - Standard Specification for Polycarbonate (PC) Unfilled and Reinforced Material, (DoD adopted), 2015 ASTM- D4060-14 – Standard Test Method for Abrasion Resistance of Organic Coatings by the Taber Abraser, 2014

American National Standard (ANSI) ANSI Z80.1-2015 – American National Standard for Ophthalmics – Prescription Ophthalmic Lenses, 2015 ANSI Z80.3-2015 – American National Standard for Ophthalmics – Nonprescription Sunglasses and Fashion Eyewear Requirements, 2015 ANSI Z87.1-2015 – American National Standard for Occupational and Education Eye and Face Protection, 2015 ANSI Z136.1-2014 – American National Standard for Safe Use of Lasers, 2014 ANSI Z136.72008 – American National Standard for Testing and Labeling of Laser Protective Equipment, 2008 Order of Precedence In the event of a conflict between this requirements document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.

List of Acronyms

SYSTEM REQUIREMENTS

This document provides system requirements for the ALEP Block 3 daytime devices. Requirements were derived from the ALEP Operational Requirements Document (ORD) CAF (TAF 505-87)-II-A and ALEP Block 3 Requirements Memo. A cross-reference between these documents and verification methodology is contained in Table 4-2.

Qualification Testing Development Test & Evaluation (DT&E) Qualification DT&E shall be conducted by the contractor to verify that ALEP Block 3 Daytime Spectacle(s) meet the performance requirements.

First Article Testing (FAT) A minimum of 15 Low Rate Initial Production (LRIP) Block 3 Aircrew Laser Eye Protection (ALEP) devices shall be subjected to first article testing in accordance with Section 4.1.1 and Table 4-3.

Production Acceptance Testing (PAT) LRIP and Full Rate Production (FRP) Block 3 Aircrew Laser Eye Protection (ALEP) devices shall be subjected to production acceptance testing in accordance with Section 4.1.1 and Table 4-4.

Materials The contractor shall select materials IAW the policies/regulations of the Berry Amendment and the materials shall meet the operational and environmental requirements specified herein.

Design Carrying Case A carrying case shall be provided with each ALEP daytime device(s). The case shall provide enough impact resistance to preclude damage to the device under normal storage and operational handling conditions. The inside surface shall be sufficiently smooth to prevent lens scratches. The case shall also contain a cleaning cloth that does not scratch the lens or degrade the filter performance. Marking shall be in accordance with 3.12.2. Verification paragraph is 4.3.1.

Physical Coverage The ALEP daytime device shall provide maximum physical coverage in front of and around the eye in all directions and the coverage shall extend to the “temporal” canthus as specified below for 95% of aircrew members at a 90% level of confidence . The canthus is defined as the corner of the eye where the upper and lower eyelids meet.

-- Objective: No coverage gap between the canthus and the temporal lens edge when the canthus is observed from 90 degrees off the forward look direction for 95% of aircrew members at a 90% level of confidence.

-- Threshold: Coverage gap shall be 9mm or less between the canthus and the temporal lens edge when the canthus is observed from 90 degrees off the forward look direction for 95% of aircrew members at a 90% level of confidence.

ALEP Spectacle Architecture The ALEP Block 3 Daytime Spectacles, Type I and Type II, arefor use on the MDS provided in Section 6.6.

Performance Characteristics Laser Protection (Optical Density) Note: Also refer to Classified Reference A, “ALEP Block 3 Protection Wavelengths and Optical Densities”.

The ALEP device(s) shall protect the eye from damage against L5, L1-L, L1-M, R1, R2, R3 laser wavelength regions at Optical Densities (OD) specified in the Classified Reference A, “ALEP Block 3 Protection Wavelengths and Optical Densities.” The OD requirements shall be met at the system level for all laser incident angles for foveocentric viewing conditions up to eye movements of 30 deg. Beyond 30 deg the OD requirements shall be met for the pupillocentric direct and deviated geometry.

Note: The System level includes the laser exposure geometry, the lens-frame as-worn geometry, and the eye geometry including pupil size (4mm for daytime conditions) and retinal locus of exposure.

Optical Performance The luminous transmission values included in this section shall be defined for the ALEP Daytime Spectacle(s).

Photopic Luminous Transmittance (PLT) The Photopic Luminous Transmittance with CIE Illuminant D65 (PLT D65) shall be greater than or equal to 10% and less than or equal to 20%.

The P43 luminous transmittance using Daytime Spectacles shall be greater than or equal to 50% of the PLT D65.

Photopic Luminous Transmission of Color Displays The head-up and head-down color displays PLT requirements are specified as ratios to the PLT D65 illuminant in Table 3-1.

Table 3-1 PLT D65 Ratios

**Legacy and LCD display primaries will be provided by the government as a Dynamic Link Library (DLL) and include head-up, head-down, and helmet mounted displays.

**P43 HUD shall be a separate performance metric**

Ultraviolet (UV) Transmittanc The mean UV transmittance shall be 0.1% or less over the range of 200 to 400nm.

Photopic Luminous Reflectance Luminous (back) reflectance shall be 4.5% threshold and 2% objective.

E94 Color Balance The ALEP device shall have an average E94 exterior scene shall be equal to or less than 8 Just-Noticable Difference (JND) with an objective of equal to or less than 5 JND.

The ALEP device shall have an average E94 for displays shall be equal to or less than 10 JND with an objective of equal to or less than 7 JND.

* The exterior scene and display spectral libraries will be provided by the government. The exterior scene library consists of spectral reflectance data from urban, woodland, littoral, and desert environments as well as runway lighting and exterior aircraft lighting. The government supplied display library consists of extensive set of in cockpit spectral measurements of relevant Mission-Design Series (MDS). These shall be provided in a DLL for each specific LEP configuration.

Visual Compatibility

AN/AVS-9 (V) Night Vision Goggles (NVGs) and the Panoramic Night Vision Goggles (PNVG) Not Applicable for Daytime Only Variant.

Aircraft Compatibility/Integration The ALEP daytime spectacle device(s) shall be visually compatible with aircraft internal cockpit, cabin lighting and displays, aircraft canopies and windscreens, head-up displays (HUDs), maps and other printed materials or exterior aircraft lights and airfield lights. The ALEP Block 3 devices shall also be compatible with detection/recognition/identification/tracking of targets, terrain colors, visibility of geographic formations, and performance of normal aircrew duties for the aircraft identified in Section 6.6. The design of the ALEP Block 3 device shall minimize the attenuation and color shift of the cockpit displays, lighting and instruments.

Optical Quality Prismatic Deviation Prismatic Deviation in the forward looking position should meet the specifications of the ANSI/ISEA Z87.1-2015, American National Standard, Occupational and Educational, Personal Eye and Face Protection Devices. These specifications are described below and tested in accordance with 4.4.4.1.

Vertical Prismatic Deviation Vertical Prismatic Deviation shall be no more than 0.50 prism diopters. Vertical imbalance should be no more than 0.25 prism diopters.

Horizontal Prismatic Deviation Horizontal Prismatic Deviation shall be no more than 0.50 diopters. The horizontal prismatic imbalance shall be no more than 0.25 prism diopters BASE IN imbalance and no more than 0.50 prism diopters BASE OUT imbalance between the left and right eye viewing angles.

Refractive Power The spherical refractive power shall be no greater than +/- 0.125D in each ALEP Block 3 device. The refractive power in the vertical or horizontal meridians shall be less than +/- 0.125D. The refractive power for the horizontal and vertical meridians (difference) shall be less than 0.125D.

Distortion The ALEP Block 3 device shall conform to one of the five acceptable fringe patterns (1 through 5) as depicted in Figure 2, Vision Distortion Standards of MIL-DTL-43511D.

Haze Haze shall be less than 3% (Threshold). Haze shall be less than 1% (Objective).

Durability Coating Adhesion Before and after humidity exposure, the visor shall show no unacceptable degradation in coating when tested in accordance with 4.4.5.1.

Abrasion Resistance Haze shall be no more than four percent (4%) after being subjected to the abrasion test in accordance with 4.4.5.2. Also, the decrease in luminous transmission shall be no more than four percentage points below its baseline.

Impact Resistance The ALEP Block 3 daytime lenses shall be shatterproof.

Corrosion Resistance There shall be no evidence of corrosion on any of the ALEP Block 3 daytime device surfaces after being subjected to a 5% (by weight) +/- 1% salt fog concentrated solution.

Heat Resistance There shall be no visible signs of blistering, discoloration, or degredation of the ALEP Block 3 device after being subjected to the non-operational high temperature test (71C/160F).

Ductility There shall be no visible cracks across the ALEP spectacle frame’s temple piece after being bent 45.

Adhesion of Plating (If applicable) No detachment of the plating coating shall be possible by probing with a sharp instrument after repeatedly bending the spectacle temple through an angle of 180.

Accommodation and Fit Aircrew Population Accommodation The ALEP daytime spectacle device(s) shall fit 95% of all aircrew members at a 90% level of confidence.

ALEP Fitting Criteria The ALEP spectacle shall be adjustable around the head, ears and nasal area to fit 95% of all aircrew members at a 90% level of confidence.

Fitting time Fitting time shall be no more than twenty (20) minutes.

Donning and Doffing The donning and doffing of the ALEP Block 3 device shall not require the removal of the helmet from the head.

Environmental Solar Radiation & Laser Saturation Solar Radiation The ALEP daytime device(s) shall meet the requirements for optical density, luminous transmittance and haze (paragraphs 3.4.1, 3.4.2.1, 3.4.4.4) and have no delamination of lenses or coatings after exposure to solar radiation at 1120 W/m2 for 100 hours (threshold) with an objective of 200 hours.

**Ballistics testing to occur on the Daytime Ballistic Spectacles after 100hrs** (To check any degradation in the frame due to solar exposure) Laser Saturation Transitory or permanent radiation-induced changes in the optical density or transmittance shall not reduce the level of protection below the optical densities specified in Classified Reference A, “ALEP Block 3 Protection Wavelengths and Optical Densities”.

High Temperature Operational High Temperature The ALEP daytime device(s) shall meet the requirements for optical density and luminous transmittance during and after exposure and shall meet the requirements for haze (paragraphs 3.4.1, 3.4.2.1, 3.4.4.4) and have no delamination of lenses or coatings after exposure to five cycles of the th operational high temperature test procedure in MIL-STD-810G, paragraph 4.5.3 Procedure II – Operations, tailored for a maximum temperature of 52C (125F).

Non-Operational High Temperature The ALEP daytime device(s) shall meet the requirements for optical density, luminous transmittance and haze (paragraphs 3.4.1, 3.4.2.1, 3.4.4.4), remain structurally intact, and have no delamination of lenses or coatings after exposure to five cycles of the operational high temperature test procedure in MIL-STD-810G, paragraph 4.5.2 Procedure I – Storage, tailored for a maximum temperature of 71C (160F).

Low Temperature Operational Low Temperature The ALEP daytime device(s) shall meet the requirements for optical density and luminous transmittance during and after exposure and shall meet the requirements for haze (paragraphs 3.4.1, 3.4.2.1, 3.4.4.4) and have no delamination of lenses or coatings after exposure to -20C (-4F) with an objective of -32C (-25F).

Non-Operational Low Temperature The ALEP daytime device(s) shall meet the requirements for optical density, luminous transmittance and haze (paragraphs 3.4.1, 3.4.2.1, 3.4.4.4), remain structurally intact, and have no delamination of lenses or coatings after exposure to -54C (-65F).

Temperature Shock The ALEP daytime device(s) shall meet the requirements for optical density, luminous transmittance and haze (paragraphs 3.4.1, 3.4.2.1, 3.4.4.4), remain structurally intact, and have no delamination of lenses or coatings after exposure to sudden changes in temperature between -20C (-4F) to +52C (+125F).

Humidity The ALEP daytime device(s) shall meet the requirements for optical density, luminous transmittance and haze (paragraphs 3.4.1, 3.4.2.1, 3.4.4.4) and have no delamination of lenses or coatings after exposure to five cycles of the humidity test procedure in MIL-STD-810G, Figure 507.5-1 tailored for a maximum temperature of 52C (125F).

Aircraft Lubricants The ALEP daytime device(s) shall meet the requirements for optical density, luminous transmittance and haze (paragraphs 3.4.1, 3.4.2.1, and 3.4.4.4) and have no delamination of lenses or coatings after exposure for a period as specified.

Significant Contact Tests The ALEP Block 3 device shall withstand significant contact with the following:

· Jet fuel grade JP-8 jet fuel (MIL-T-83133)

· Hydraulic fluid (specified in MIL-PRF-83282 and MIL-H-5606) Following contact with each of the above fluids for 24 hours, the device shall meet the requirements for optical density, luminous transmittance and haze (3.4.1, 3.4.2.1 and 3.4.4.4) and have no delamination after cleaning of the contacted surface.

Occational Contact Tests The ALEP Block 3 device shall withstand occasional contact with the following:

· Cleaners: soap in water

· Water

· Electronic equipment coolant polyalphaolefin (PAO), MIL-PRF-87252, and NATO equivalents.

· Fire extinguishing agent: Sodium Bicarbonate

· Deicing fluids including full strength ethylene glycol/urea (AMS 1435), propylene glycol (AMS-1424), isopropyl alcohol (TT-I-735), or NATO equivalent deicing Following contact with each of the above fluids for 4 hours, the device shall meet the requirements for optical density, luminous transmittance and haze (3.4.1, 3.4.2.1 and 3.4.4.4) and have no delamination after cleaning of the contacted surface.

Salt Fog Resistance The ALEP daytime device(s) shall meet the requirements for optical density, luminous transmittance, haze and corrosion resistance (paragraphs 3.4.1, 3.4.2.1, 3.4.4.4 and 3.4.5.4) and have no delamination of lenses or coatings after exposure to a 5%, by weight, +/- 1% salt fog concentrated solution.

Acceleration The ALEP daytime device(s) shall meet the requirements for optical density, luminous transmittance and haze (paragraphs 3.4.1, 3.4.2.1, 3.4.4.4) and have no delamination of lenses or coatings after exposure to the acceleration profiles for aircraft identified in Table 513.5-I, MIL-STD-810G.

Ballistic Fragmentation Characteristics The Daytime Ballistic Spectacles (Type II) shall provide ballistics fragmentation protection. Eyewear shall be sufficiently durable to remain intact (i.e., all components required for protection and proper retention of the eyewear remain attached: upon/after impact. Items shall be tested both with and without prescription lenses for initial approval of the design.

Type II – Ballistic Spectacles Type II ALEP Block 3 Daytime Ballistic Spectacle lenses shall provide ballistic protection IAW section 4.5.9.4.

Physical Performance Attributes Prescription Eyewear Compatibility The ALEP spectacle shall be visually and physically compatible with approved aircrew contact lenses and offer prescription capability in the range of +/- 4 diopters of sphere and –2 diopters of cylinder. Field of regard through the prescription lenses should be sufficient to support normal aircrew tasks that may require optical correction, including looking around/beneath the Helmet Mounted Displays (HMD).

Field of View (FOV) The ALEP Block 3 device(s) shall provide adequate FOV in the cockpit/cabin in order for the aircrew member to perform normal aircrew tasks for missions in all configurations.

Physical Fit Compatibility with Aircrew Flight Equipment (AFE) The ALEP device shall be fit compatible with the HGU-55/P Helmet (including clear visor only), Lightweight HGU-55/P Helmet (including clear visor only), HGU-56/P helmet (including clear visor only), MBU-12/P, MBU-20/P and MBU-20A/P Oxygen Masks and MBU-19P Aircrew Eye Respiratory Protection (AERP). The ALEP device shall minimize hot spots/pressure point that degrade performance on 95% of aircrew.

The ALEP Block 3 device(s) shall be fit compatible with HMD including an oxygen mask (including Chemical, Biological, Radiation and Nuclear (CBRN) assemblies). The ALEP device(s) shall minimize hot spots/pressure points that degrade performance on 95% of aircrew.

Physical Fit Compatibility with Earcups The donning or doffing of the ALEP Block 3 device(s) shall not cause the earcup function to degrade below its specified performance.

Reliability ALEP Physical Assembly The ALEP Block 3 device(s) physical assembly (e.g. frame, lenses, and screws) shall meet the intent of reliability by successfully satisfying the durability and environmental requirements in paragraphs 3.4.5 and 3.5.

Laser Protection Service Life The ALEP device(s) shall have a service life of required laser protection for at least five years when it is operated in its intended operational environment.

Storage Life The ALEP device(s) shall maintain its required laser protection for at least five years when stored under normal climate controlled storage conditions.

Maintainability Mean Corrective Maintenance Time (MCMT) The MCMT shall be twenty (20) minutes or less.

Mean Preventive Maintenance Time (MPMT) The MPMT shall be sixty (60) minutes or less.

Mobility The ALEP daytime device(s) shall be deployable using mobility stowage requirements used for current aircrew laser eye protection and ocular devices.

Safety The ALEP daytime device(s) shall have no sharp edges, points, or projections that would cause injury during handling, emergency egress, bailout or ejection. All device and carrying case parts shall be securely attached to prevent “foreign object debris” (FOD) in the cockpit/cabin.

Workmanship Defects in the Viewing Surface There shall be no noticeable cosmetic defects (distortions, abrasion, roughness, scratch, discoloration, etc.), or non-uniformity in the central viewing area (+/- 30 degrees from forward-look) of the device. Only one noticeable defect is acceptable on the viewing surface if it is outside the central viewing area. Appendix A provides a list of defects (Table A-1).

ALEP Block 3 Spectacle Frame Defects There shall be no mechanical damage or warping in any region of the ALEP frame.

Identification of Product Device Marking Each device shall be clearly marked with “ALEP Block 3” to distinguish its protection capability. Each device shall be clearly marked with a part number, serial number, and Item Unique Identification (IUID) that is machine-readable in accordance with MIL-STD-130N for tracking and accountability purposes.

Markings on the device shall not cause them to be classified. For spectacles, the frame size shall be specified along with the marking. If an eye-centered filter approach is used, the inter-pupillary distance (IPD) or frame size (as appropriate) shall be specified along with the marking.

Carrying Case The front flap of the carrying case shall display the nomenclature of the ALEP device, manufacturer’s identification number, part number and contract number information. A caution notice shall be placed in the unit package with the carrying case. The device and all associated subcomponents must fit securely within the carrying case.

Visual Examination When visually examined, the device and protective container shall be free of defects as specified in Table 4.5 and Appendix A-1.

VERIFICATION

The contractor shall be responsible for verifying all qualification testing requirements using the verification methods specified in Table 4-1. During LRIP/ FRP, the contractor is only responsible for verifying requirements in Tables 4-2 and 4-3 for Qualification Testing and Production Acceptance Testing, respectively. Test procedures and verification methods for contractor testing require review and approval by the government.

Qualification Testing Qualification and Production Acceptance Testing The contractor shall conduct qualification and production acceptance testing for the ALEP daytime device(s) and satisfy all threshold requirements as specified in Table 4-2 and Table 4-3. Qualification testing shall verify system performance. The contractor shall provide a qualification plan subject to approval by the buyer. Production acceptance tests shall be conducted IAW the buyer approved Acceptance Test Procedure (ATP) by the contractor to assess the performance of the ALEP daytime device(s) and the effectiveness of the manufacturing and production process.

Table 4-1 Verification Methods

Table 4-2 Contractor Qualification Test (CQT) Matrix Requirement Paragraph Verification Requirement Verification Method Type

Table 4-3 First Article Testing

Inspection Requirement Paragraph Verification Paragraph Spectacle Type

Laser Protection Optical Performance

Luminous Transmission Luminous Reflectance Ultraviolet (UV) Transmittance Luminous Reflectance E94 Color Balance

Vertical Prismatic Deviation Horizontal Prismatic Deviation Refractive Power Distortion Haze

Coating Adhesion Abrasion Resistance Impact Resistance Solar Radiation Laser Saturation

Operational High Temperature Operational Low Temperature Temperature Shock Humidity

Ballistic Fragmentation Protection*

Safety Workmanship Identification of Product Visual Examination 3.4.1 3.4.2

3.4.2.1 3.4.2.2 3.4.2.3 3.4.2.4 3.4.2.5

3.4.4.1.1 3.4.4.1.2 3.4.4.2 3.4.4.3 3.4.4.4

3.4.5.1 3.4.4.2 3.4.4.3 3.4.4.4 3.4.4.5

3.5.2.1 3.5.3.1 3.5.4 3.5.5

3.5.9

3.10 3.11 3.12 3.13 4.4.1 4.4.2

4.4.2.1 4.4.2.2 4.4.2.3 4.4.2.4 4.4.2.5

4.4.4.1.1 4.4.4.1.2 4.4.4.2 4.4.4.3 4.4.4.4

4.4.5.1 4.4.5.2 4.4.5.3 4.4.4.4 4.4.4.5

4.5.2.1 4.5.3.1 4.5.4 4.5.5

4.5.9

4.10 4.11 4.12 4.13

I & II

I & II

I & II

I & II

I & II

I & II

I & II

I & II

I & II

I & II

I & II

I & II

I & II

I & II

I & II

I & II

I & II

I & II

I & II

I & II

I & II

II

I & II

I & II

I & II

*Note--This is the last test to be performed on a Type II Spectacle during First Article Testing

Table 4-4 Production Acceptance Testing

Inspection Requirement Paragraph Verification Paragraph Spectacle Type

Laser Protection

Luminous Transmission Luminous Reflectance E94 Color Balance

Vertical Prismatic Deviation Horizontal Prismatic Deviation Refractive Power Haze

Ballistic Fragmentation Protection*

Safety Workmanship Identification of Product Visual Examination 3.4.1

3.4.2.1 3.4.2.2 3.4.2.3

3.4.4.1.1 3.4.4.1.2 3.4.4.2 3.4.4.4

3.5.9

3.10 3.11 3.12 3.13 4.4.1

4.4.2.1 4.4.2.2 4.4.2.3

4.4.4.1.1 4.4.4.1.2 4.4.4.2 4.4.4.4

4.5.9

4.10 4.11 4.12 4.13

I & II

I & II

I & II

I & II

I & II

I & II

I & II

I & II

II

I & II

I & II

*Note—This test is to be performed periodically on a Type II Spectacle during production, but since it is a destructive test it is only used to prove continuing reliability of the process.

Table 4-5 Defects for Visual Examination of the ALEP daytime device(s)

Lens

Frame

Construction and workmanship

Carrying container

Cleaning Cloth

Markings:

Frame

Carrying Container

Caution Notice

Any material imperfections that adversely affect the level of protection or the visual properties.

Identification or size information missing, if required.

Component missing or damaged. Any burr or sharp edge that may cause injury. Any loose parts that may become FOD.

Container missing. Any component missing or damaged that would diminish protection to contents or reduce impact resistance. Smooth interior surfaces to prevent lens scratches.

Missing – not included in carrying container.

Missing, misspelled, illegible, or incorrect.

Missing, misspelled, illegible, or incorrect.

Missing – not included in carrying case.

Materials Verification The contractor shall verify all materials are IAW the policies/regulations of the Berry Amendment and that the materials meet the operational and environmental requirements specified herein.

Design Verification Carrying Container A carrying container shall be provided with each ALEP Block 3 device. The container shall provide enough impact resistance to preclude damage to the device under normal storage and operational handling conditions. The inside surface and cleaning cloth shall be sufficiently smooth to prevent lens scratches and degradation of device performance.

Physical Coverage Spectacle physical coverage verification shall consist of measuring the gap (if it exists) between the subject’s temporal canthus and the temporal edge of the lens when observed from 90 degrees off the forward look direction. The measurement will be recorded in millimeters and shall satisfy 95% of aircrew members evaluated. The canthus is defined as the corner of the eye where the upper and lower eyelids meet.

ALEP Spectacle Frame The ALEP spectacle will be inspected to verify that the spectacle assembly uses the TBD frame and its sizes as specified in 3.3.3.

Performance Characteristics Verification Verification for qualification and production acceptance testing shall be accomplished by inspection, analysis, demonstration, similarity, and/or test as stated in section 4.1 and specified in Tables 4-3 (Qualification) and 4-4 (Production Acceptance). Verification methodologies using industry standards and practices are also acceptable with buyer approval.

Laser Protection (Optical Density) The ALEP daytime device(s) optical density (OD) requirement 3.4.1 will be verified using the testing procedures described in Classified Reference A, “ALEP Protection Wavelengths and Optical Densities”.

Optical Performance Photopic Luminous Transmittance (PLT).

The photopic luminous transmittance (transmittance for the light adapted eye) is calculated by using the standard photopic luminous efficiency V () values as published by CIE. Use CIE illuminant D65 for the spectral power distribution function E (). These values can be easily obtained from the CIE web page. The ALEP daytime device(s) shall meet the requirements specified in 3.4.2.1. The PLT is then calculated using the equation below:

T () = Spectral transmittance of the ALEP lens at V () = Photopic spectral luminous efficiency function based on the CIE (1931) standard observer as a function of E (-D65) = Spectral power distribution of standard illuminant D65 (source) E(-HMD) = Spectral power distribution of HMD (P43 or RGB) E(-P43) = Spectral power distribution of P43 = Wavelength interval

The ALEP PLT D65 requirement as specified in 3.4.2.1.2 shall be calculated by analysis using the ALEP Block 3 device with the minimum PLT D65 measured from each qualification and production acceptance test.

Photopic Luminous Transmission of Color Displays The PLT D65 ratios will be calculated using a government provided DLL (Dynamic Linked Library) to include both color cockpit and HMDs to verify the requirements in Section 3.4.2.2.

Ultraviolet (UV) Transmittance The ultraviolet transmittance shall be measured by a spectrophotometer that has the capability of measuring optical densities of 3.0 or greater in the 200-400 nm portion of the spectrum. The spectrophotometer scan shall be used to compute the transmittance as described below or a summation with wavelength intervals of 5 nm or less may be used for the computation. The mean UV transmittance is calculated as follows:

Photopic Luminous Reflectance The photopic luminous reflectance (PLR) is calculated by using the standard photopic luminous efficiency V () values as published by CIE. Use CIE illuminant D65 for the spectral power distribution function E (). These values can be easily obtained from the CIE web page. R() is the spectral reflectance power distribution of light reflected off the back surface of the lens. The ALEP Block 3 device shall meet the luminous reflectance requirements specified in 3.4.2.2. The PLR is then calculated using the equation below:

R() = Spectral reflectance power distribution of the ALEP lens at V () = Photopic spectral luminous efficiency function based on the CIE (1931) standard observer as a function of E(-D65)= Spectral power distribution of standard illuminant D65 (source) = Wavelength interval E94 Color Balance E94 is a CIE recommendation to evaluate color differences as a function of differences in lightness (L), hue (H), and chroma (C) (CIE Technical Report 166-1995, Industrial Color-Difference Evaluation). It is a closer representation of color differences than distances in CIE L*a*b* uniform color space. The formula is shown below:

SL, SC and SH are standard correction weighting factors for lightness, chroma and hue recommended by CIE. CIE also recommend kL, kC and kH are always 1.0 except for very special lighting cases. These values will default to 1.0 for ALEP computations.

The ALEP Block 3 device E94 requirements as specified in 3.4.2.4 shall be calculated by analysis using the ALEP Block 3 device with the maximum E94 from each qualification and production acceptance test.

Visual Compatibility The following tests will specifically verify requirements in paragraphs 3.4.3. Test subjects will be given a comprehensive questionnaire and asked to rate the device after performing the tests. Testing will assess the effects of the device on visual performance.

Operational aircraft or an equivalent system (using representative cockpits/cabins with production hardware controls and displays) shall be used to verify display compatibility of the ALEP Block 3 device. Test subjects shall be experienced pilots that have knowledge and experience with the MDS under evaluation.

The device shall demonstrate visual compatibility with the MDS under evaluation Pilots simulating normal duties, including scanning outside the aircraft and scanning all cockpit/cabin displays, shall be accomplished. Pilots will complete a survey to determine whether the ALEP Block 3 device is compatible with the MDS.

The test subjects will be fitted with the ALEP Block 3 device and a test evaluator shall orally present a survey questionnaire to the subjects. This will allow the subjects to respond to the evaluation and give ratings while still wearing the Block 3 device and viewing the displays being evaluated.

In addition to the cockpit/cabin displays, the subjects will be asked to evaluate the effect of the Block 3 device on viewing through the canopy. Exterior aircraft lights and airfield lights will be assessed for visual compatibility. The test evaluator will record the responses to the questionnaire. During the assessment, the test subjects will be prompted to comment freely on any aspects of the Block 3 device. The test evaluator will record these comments.

Visual compatibility with cockpit/cabin interior lighting and displays, aircraft canopy, maps and other printed materials, exterior aircraft lights, airfield lights, detection/recognition/identification/tracking of targets, terrain colors, visibility of geographic formations, and performance of normal pilot duties shall be assessed on a scale from 1 to 6 with 6 being very satisfactory, and 1 being very unsatisfactory. Responses shall be gathered and recorded by a test evaluator with the use of a questionnaire. An average response of 4.0 or higher shall be deemed a success.

Optical Quality Prismatic Deviation Vertical Prismatic Deviation The ALEP Daytime device(s) shall be tested for prismatic vertical deviation and for vertical imbalance. Base up prism shall be designated positive (+) and base down prism shall be designated negative (-). The vertical prismatic imbalance shall be calculated by determining the algebraic difference between the amount of prism at the design eye-point relative to the right eye and the amount of prism at the design eye-point relative to the left eye. Prismatic vertical deviation and vertical imbalance shall meet the requirements specified in 3.4.4.1.1. Measurements shall be made in the "as worn" forward look condition for both eyes.

Horizontal Prismatic Deviation The ALEP Daytime device(s) shall be tested for horizontal prismatic deviation, BASE IN imbalance and BASE OUT imbalance. BASE OUT prism shall be designated positive (+) and BASE IN prism shall be designated negative (-). The prismatic horizontal imbalance shall be calculated by determining the algebraic sum between the amount of prism at the design eye-point relative to the right eye and the amount of prism at the design eye-point relative to the left eye. Prismatic horizontal deviation, BASE IN imbalance and BASE OUT imbalance shall meet the requirements specified in 3.4.4.1.2. Measurements shall be made in the "as worn" forward look condition for both eyes.

Refractive Power The ALEP daytime device(s) shall be tested for refractive power using the method described in MIL-DTL-43511D and shall meet the requirements specified in 3.4.4.2. Measurements shall be made in the “as worn” forward look condition.

Distortion The ALEP Block 3 devices shall be measured in the “as worn” forward look condition for distortion using the distortion tester procedure in Mil-DTL-43511D. The double pass method of measuring distortion defined in MIL-DTL-43511D is unsatisfactory in testing most ALEP Block 3 devices. This method requires light to pass through the ALEP twice, reducing the contrast to the point that accurate measurements can’t be made. If this is the case, use the Single Pass Optical Distortion test procedure (modified version of Double Pass method). The pattern is compared to the acceptable fringe patterns (fringe patterns 1 through 5) shown in Figure 2 in MIL-DTL-43511D. Fringe patterns 6 through 9 in Figure 2 are unacceptable. Distortion in the ALEP lenses must conform to one of the acceptable fringe patterns (fringe patterns 1 through 5) as depicted in Figure 2, Vision Distortion standards, MIL-DTL-43511D.

Haze The haze shall be determined in accordance with ASTM-D1003-92.

Durability Coating Adhesion The optical surfaces shall be subjected to tape test method B as defined in ASTM D3359-83. The adhesion test shall be performed on the front and rear surface of the optical surfaces. The tested areas shall be closely examined with <5% coating removal and classification of 4B or better in accordance with ASTM D3359 and Appendix B Figure B-1. The ALEP Block 3 devices and coating shall remain intact after being subjected to the coating adhesion test and meet the requirements in paragraph 3.4.5.1. Suggested sources of tapes are located in 6.3.2.

Abrasion Resistance The areas of the optical surfaces where the abrasion test is to be performed shall be identified.