PSpec_JSAM_SA_AUG_2017.pdf

WARNING – This document contains technical data whose export is restricted by the Arms

Export Control Act (Title 22, U.S.C., App Sec 2751 et seq.) or the Export Administrative Act of

1979, as amended (Title 50, U.S.C., App Sec 2401 et seq.) Violations of these export laws are subject to severe criminal penalties. Disseminate in accordance with the provisions of DOD

Directive 5230.25.

PRF EA-M-2380

CAGE Code: 81361

August 2017

PERFORMANCE SPECIFICATION FOR

MASK, CHEMICAL-BIOLOGICAL: PROTECTIVE M69

Prepared for:

Joint Project Manager Protection (JPM P)

Prepared by:

Joint Service Aircrew Mask Strategic Aircraft (JSAM SA)Team

50 Tech Parkway

Stafford, VA 22556

SUBMITTED BY: DATE:

Timothy R. Krakowski

JSAM SA System Engineer

APPROVED FOR USE AS

PRODUCT BASELINE BY: __ DATE:

Ryan Adams

Product Manager, JSAM SA

AMSC N/A FSC 4240

DISTRIBUTION STATEMENT X. Distribution authorized to U.S. Government agencies or private individuals or enterprises eligible to accept export-controlled technical data in accordance with DODD 5230.25, determination made 8 September 2009. Controlling DOD office is U.S. Army Edgewood Chemical Biological Center, ATTN: AMSRD-ECB-ENP-IP, 5183 Blackhawk Road, Aberdeen Proving Ground, MD 21010-5424.

EA-M-2380

1. SCOPE

This specification covers the performance requirements for one type of chemical-biological protective mask (see 6.1): M69 (also known as the Modified M53 and XM69). Key Performance

Parameters (KPPs) have been identified with an asterisk (*) and Key System Attributes (KSAs) have been identified with a plus (+) to aid in traceability of key requirements to the JSAM for Strategic

Aircraft Capability Production Document (CPD). Objective requirements have been identified with the following designation: {Objective}.

2. APPLICABLE DOCUMENTS

2.1 General.

The documents listed in this section are specified in sections 3 or 4 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 insure the completeness of this list, document users are cautioned that they must meet all specified requirements of documents cited in sections 3 or 4 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. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract.

DEPARTMENT OF DEFENSE SPECIFICATIONS

MIL-DTL-32102 Joint Service Lightweight Integrated Suit Technology (JSLIST) Coat and

Trouser, Chemical Protective; 3 Apr 2002

MIL-PRF-51560C Canister, Chemical-Biological Mask: C2A1, 20 Mar 2009

MIL-V-43511C Military Specification Visors, Flyer’s Helmet, Polycarbonate

DEPARTMENT OF DEFENSE STANDARDS

MIL-STD-130N Identification Marking of U.S. Military Property

MIL-STD-461F Requirements for the Control of Electromagnetic Interference

Characteristics of Subsystems and Equipment

MIL-STD-464C Electromagnetic Environmental Effects Requirements for System

MIL-STD-662F V50 Ballistic Test for Armor

MIL-STD-810G Environmental Engineering Considerations and Laboratory Tests

DEPARTMENT OF DEFENSE HANDBOOKS

MIL-HDBK-743A Anthropometry of U.S. Military Personnel

(Copies of these documents are available online at http://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 publications 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.

Air Standardization Coordinating Committee (ASCC) Air Standard 61/112/2B - Minimum

Physiological Requirements for Aircrew CBRN Protective Headgear; 3 Sep 1991

TOP 10-2-022 – Man-In-Simulant Test, Chemical vapor and Aerosol System-Level Testing of

Chemical/Biological

TOP 8-2-110 – Masks, Protective

TOP 8-2-501 – Permeation and Penetration Testing of Air-Permeable, Semi-Permeable and

Impermeable Materials with Chemical Agents

USAARL Report 96-1 – Assessment Methodology for Integration Helmet and Display Systems in

Rotary-Wing Aircraft, Jun 1996

T.O. 33D2-10-10-31 –Technical Manual Tester Oxygen Mask, Headset and Microphone Type

MQ 1

TO 33D2-10-10-51 – Technical Manual Oxygen Mask, Headset, Microphone, and EEU-2P

Goggles Tester Type MQ-1A

Scot Document 6112-510, Technical Manual Operational and Maintenance Instructions for

Oxygen Mask Test Unit

(Copies of this document are available from U.S. Army Edgewood Chemical Biological Center, ATTN:

RDCB-DEP-J, 5183 Blackhawk Road, Aberdeen Proving Ground, MD 21010-5424.)

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 solicitation or contract.

AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI)

S12.42 - Microphone in Real-Ear and Acoustic Test Fixture Methods for the Measurement of

Insertion Loss of Circumaural Hearing Protection Devices

Z 87.1 - Occupational and Educational Eye and Face Protection

ASTM INTERNATIONAL

D 1003 Haze and Luminous Transmittance of Transparent Plastics

D 1044 Standard Test Method for Resistance of Transparent Plastics to Surface

Abrasion

D 1171 Rubber Deterioration-Surface Ozone Cracking Outdoors or Chamber

(Triangular Specimens)

G63 Standard Guide for Evaluating Non-Metallic Materials for Oxygen Service

G94 Standard Guide for Evaluating Metals for Oxygen Service

E313 Standard Practice for Calculating Yellowness and Whiteness Indices from

Instrumentally Measured Color Coordinates

(Copies of this document are available from www.astm.org or ASTM International, 100 Barr Harbor

Drive, PO Box C700, West Conshohocken, PA 19428-2959 or http://ASTM.org.)

EUROPEAN COMMITTEE FOR STANDARDIZATION

EN 136 Respiratory protective devices - Full face masks - Requirements, testing, marking

SOCIETY OF AUTOMOTIVE ENGINEERS (SAE)

ARP 1176 Oxygen System and Component Cleaning and Packaging

2.4 Order of Precedence.

Unless otherwise noted herein or in the contract, in the event of a conflict between the text of this 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.

3. REQUIREMENTS

3.1 First Article.

Reserved for future requirement.

3.2 OPERATING REQUIREMENTS.

The mask shall provide the following functional, operational, and performance capabilities:

*3.2.1 Filters.

The mask filters shall comply with MIL-PRF-51560 for the C2A1 canister.

3.2.2 Mask Requirements.

The mask shall meet the following operating requirements:

*3.2.2.1 Mask Chemical Biological (CB) Protection.

The mask system shall provide ocular, percutaneous, and respiratory protection against HD, GB, GD, and VX for a period of 12 hours {Objective, 24 hours}. The mask system shall provide chemical agent protection at the following 12-hour ocular and respiratory exposure levels: 0.13 CT for VX; 11.653 CT for HD; 1.30 CT for GB; and 0.65 CT for GD. {Objective, the mask system shall provide chemical agent protection at the following 24-hour ocular and respiratory exposure levels: 0.158 CT for VX;

11.653 CT for HD; 1.576 CT for GB; and 0.788 CT for GD.}

*3.2.2.2 Material Level CB Protection.

Materials which do not contribute to eye and respiratory protection shall provide protection equal to or greater than Joint Service Lightweight Integrated Suit Technology (JSLIST), ground crew garment material. See MIL-DTL-32102.

*3.2.2.3 CB Protection (Protection Factor).

The mask shall provide unblown oronasal and eye protection to the user population when worn with the equipment in Appendix D. The mask shall provide at least a 0.88 probability of achieving protection factors greater than 1,667, a 0.75 probability of achieving protection factors greater than 6,667, a 0.68 probability of achieving protection factors greater than 10,000 in accordance with Appendix A.

{Objective, the mask will provide at least a 0.88 probability with 90 percent confidence of achieving a protection factor of 50,000.}

3.2.2.4 Fit factor.

The mask shall provide a fit factor of 6,667:1 (minimum) to the joint service male and female aircrew population when worn with protective hood.

3.2.2.5 Breathing

3.2.2.5.1 Hypoxia Protection.

The mask shall integrate with the aircraft systems and aircrew flight equipment of the aircraft in

Appendix C and D, respectively, to provide hypoxia protection during flight operations (including emergency descent) up to an altitude of 40,000 threshold feet Mean Sea Level (MSL) or the service ceiling of the aircraft, whichever is lower. This requirement also applies to aircraft, which employ portable oxygen systems for flight above 10,000 feet MSL and for emergency/backup oxygen systems.

For aircraft that have service ceilings over 40,000 MSL, the mask shall provide hypoxia protection during emergency descents.

3.2.2.5.2 Breathing Resistance.

When operating without a regulator, or when operating with the CRU-103 regulator, the breathing resistance shall be as specified in Air Standard 61/112/2B, “Minimum Physiological Requirements for

Aircrew NBC Protective Headgear (All Aircraft Except High Performance and Rotary Wing Aircraft”.

ASCC Air Standard 61/112/2B

Table 1. Recommended Maximum Respiratory Impedance

(All Aircraft Except High Performance and Rotary Wing Aircraft)

SUGGESTED VALUES FOR THE MAXIMUM IMPEDANCE TO

RESPIRATION IMPOSED BY NBC PROTECTIVE ASSEMBLIES AT ALL

ALTITUDES FROM GROUND LEVEL TO 12,200 M (40,000 FEET)

Peak Inspiratory and

Expirator Flow

[litre (ATPD) sec-1 ]

Oronasal Compartment Pressures

[kPa (inch water gauge)]

Maximum

Swing1

Minimum

(gauge to ambient) Maximum2

NORMAL OPERATING MODES

0.5 0.50 (2.0) -0.48 (-1.9) +0.88 (+3.5)

1.5 0.85 (3.4) -0.90 (-3.6) +0.95 (+3.8)

2.5 1.75 (7.0) -1.65 (-6.6) +1.25 (+5.0)

FOLLOWING FAILURE OF PRIMARY SOURCE OF FORCED VENTILATION

0.5 0.75 (3.0) -0.55 (-2.2) +0.88 (+3.5)

1.5 1.60 (6.4) -1.00 (-4.0) +1.10 (+4.4)

1. The swing of oronasal compartment pressure is the difference between minimum and maximum pressures during the respiratory cycle.

2. Measured relative to ambient pressure.

When operating with Air Force regulators, such as the CRU-73 regulator, the breathing resistance shall be less than or equal to the resistance when those regulators are used with Aircrew Eye Respirator

Protective (AERP), MBU-19/P. {Objective, when operating with the CRU-73 regulator, the breathing resistance shall be as specified in Air Standard 61/112/2B, “Minimum Physiological Requirements for

Aircrew NBC Protective Headgear (All Aircraft Except High Performance and Rotary Wing Aircraft”.}

3.2.2.5.3 Decompression.

3.2.2.5.3.1 Oxygen Delivery

The mask shall deliver oxygen effectively after a decompression (from appropriate aircraft cabin pressure) at +1Gz up to an altitude of 40,000 feet MSL and a subsequent descent to 10,000 feet MSL at a peak rate of 10,000 feet per minute.

3.2.2.5.3.2 Pressure Spike

The decompression-derived pressure in the mask cavity shall not exceed 53.5 inches of water for 250 milliseconds during an unmanned 1 second decompression (from appropriate aircraft cabin pressure) to

40,000 feet MSL. The decompression-derived pressure in the mask cavity shall not exceed 24 inches of water during a manned 7 second decompression (from appropriate aircraft cabin pressure) to 40,000 feet

MSL.

3.2.2.6 Vision.

The mask shall meet the following vision requirements:

3.2.2.6.1 Field of View.

Provide a minimum of 80 percent overall, lateral field-of-view, and a minimum of 50 percent overlapping field-of-view compared to the barefaced condition when the eyes move laterally to their farthest point of rotation.

3.2.2.6.2 Shatter Resistance.

The lens of the mask shall resist shattering and experience no fractures or object penetration from impact.

3.2.2.6.3 Eye Protection.

The lens shall provide eye protection against ballistic hazards as specified in MIL-STD-662 (pass V0 test using 0.15 caliber, 5.8 grain, T37 shaped projectile at a velocity of 640-660 feet per second).

{Objective, the lens will pass the V0 test using the 0.22 caliber, 17.0 grain, T37 shaped projectile at a velocity of 550 to 560 feet per second.}

3.2.2.6.4 Light Transmission.

The lens of the mask shall provide a luminous transmittance of greater than or equal to 90 percent.

3.2.2.6.5 Yellowness Index.

Yellowness of the lens shall initially be less than 5 and, after a 12 week long term storage test, less than 20 as determined by the Yellowness Index measured against a standard calibration plate.

3.2.2.6.6 Haze.

The lens of the mask shall provide a haze less than 3 percent.

3.2.2.6.7 Abrasion Resistance.

After being subjected to the tests in 4.5.1.15, the mask shall meet requirements of 3.2.2.6.6.

3.2.2.6.8 Prismatic Deviation.

The lens of the mask shall not have ± 0.18 diopters vertical prismatic deviation and the algebraic sum of the horizontal deviation between the two center points must not exceed +0.50 (base out) or -0.18

(base in) diopters. The algebraic difference of the horizontal deviation shall not exceed 0.18 (base in or base out) diopters.

3.2.2.6.9 Refractive Power.

The lens critical viewing area of the mask shall not exceed +/-0.125 diopters for spherical and cylindrical power in any meridian.

+ 3.2.2.6.10 Distortion.

The lenses (primary or outsert, if needed) shall have no distortion in the critical viewing area which would impact safety of flight, prevent emergency operations, cause the user to misinterpret visual information, nor cause discomfort to the user. {Objective, the lenses will meet section 3.5.5 of MIL-V-

43511C.}

3.2.2.6.11 Optical Correction.

Provide a means for optical correction without degrading protection or fit factors for corrective ranges of ±8 diopters.

3.2.2.6.12 Laser Protection.

Reserved for future requirement.

3.2.2.6.13 Fogging.

The mask shall prevent fog buildup on the mask optical surfaces that would impact aircrew’s ability to complete flight and ground operations without the use of a topical anti-fog compounds by the user.

3.2.2.6.14 Windblast.

The eye protection shall remain intact in all operational environments to include exposure to a windblast (on and off-axis) of 150 +/- 10 KEAS for 30 seconds.

3.2.2.7 Speech/Communications.

The mask shall provide an integrated microphone capability without voice distortion that will operate without breaking the seal of the mask. The mask shall integrate with the Intercommunication Unit

Model 6015-1 (or equivalent) Intercom Unit for high noise situations during Ground operations.

3.2.2.8 Drinking Capability.

The mask shall meet the following drinking capability requirements:

3.2.2.8.1 Liquid Intake and Protection.

Provide a drinking capability that does not reduce protection of the mask when coupled to the liquid source via a compatible adapter.

3.2.2.8.2 Liquid Intake Rate.

Provide for the intake of liquid at a rate of not less than 200 ml/min.

3.2.2. 9 Wearability and Comfort.

The mask shall be capable of being worn for up to 12 hours while performing their assigned aircrew duties without causing undue “hotspots” or other discomfort. Minimize wear and fatigue (i.e. hot spots, headaches, eye discomfort, and heat stress) with Appendix D equipment.

3.2.2.10 Buckle Pull.

The buckles on the mask shall withstand a minimum of 25 pounds of pull without separating from the mask.

3.2.2.11 Carbon Dioxide (CO2).

The mask inhaled carbon dioxide concentration shall be less than or equal to 1 percent while being worn.

3.2.2.12 Detectability.

The visual, infrared, and electromagnetic field detection of the mask shall be equivalent to or less than the M53 mask. The color of the mask shall be matte black.

3.2.2.13 Mask Leak Integrity.

3.2.2.13.1 Chemical and Biological Leakage.

The mask facepiece assembly leak rate shall not exceed 0.003% inward leakage when measured on the M14, JSMLT, ATI TDA-99M, ATI TDA-99B or equivalent mask leakage tester. Exhalation valve leakage shall not exceed 15 cubic centimeters per minute of air when a pressure differential of 1 inch of water is applied. Drink seat and drink train leakage shall be less than 0.5 milliliters per minute when a differential pressure of 6 inches of water is applied.

3.2.2.13.2 Pressure Breathing Leakage.

Mask shall meet the test requirements for preflight and period maintenance IAW the applicable tester manual for the Scot Oxygen Mask Tester (PN 6112300).

3.2.2.14 Water Survival.

3.2.2.14.1 Escape Devices.

The mask will facilitate usage of the SRU-42/P Helicopter Emergency Escape Device (HEED), HEED III, and SRU-40/P Helicopter Aircrew Breathing Devices (HABD); escape devices pertain to

CV-22.

3.2.2.14.2 Adverse Flotation.

The mask as worn on the aircrew will not cause adverse flotation characteristics (i.e. face down attitude) in water.

3.2.2.14.3 Passive Anti-Suffocation.

Reserved for a future requirement.

3.2.2.14.4 Active Anti-Suffocation.

The mask will provision for aircrew-activated anti-suffocation capability.

3.2.2.15 Sanitization.

The mask and accessories shall be easily cleaned and sanitized using service-approved procedures and substances without reducing protection or causing damage to mask components.

3.2.2.16 Crash Survivability.

The mask shall not degrade the crash protection properties (impact protection, dynamic retention) afforded by aircraft systems (e.g., impact-absorbing seats) and current aircrew flight equipment (e.g., helmets) in crashes which are deemed to be aircrew survivable.

3.2.2.17 Rescue

The mask shall not interfere with the use of Search and Rescue (SAR) equipment or procedures.

3.2.2.18 Head Supported Weight.

The weight of the head-supported mask components (mask assembly and hood) in the CB mode shall not exceed 2.00 pounds.

3.2.2.19 Aircraft Ingress / Egress.

The mask shall not inhibit rapid ingress into the aircraft and connection of life support equipment for aircraft identified in Appendix C. The mask shall not inhibit rapid, unassisted emergency egress for the aircraft identified in Appendix C. The mask shall not inhibit manual, unassisted bailout; parachute opening; or the proper performance of post-bailout procedures.

3.2.2.20 Body Supported Weight.

The total weight of the body-supported components shall not exceed 11 pounds.

3.2.2.21 Middle Ear Equalization.

The mask shall permit the wearer to perform one-handed middle-ear equalization without breaking

CB seal. This will be accomplished while wearing Mission Oriented Protective Posture (MOPP) IV gloves..

3.2.2.22 Filter Placement.

Reserved for a future requirement.

3.2.2.23 Filter Mount.

The filter mounts shall be compatible with a NATO 40mm standard threading. The mask shall be compatible with the C2A1 canister.

3.2.2.24 Repetitive Mating.

Reserved for future requirement.

3.2.2.25 Stability.

The mask shall remain stable on the aircrew's head throughout the flight environments of the aircraft in Appendix C. The mask shall provide stability such that the aircrew has acceptable field of view and acceptable use of devices which require precise eye position.

3.2.2.26 Vomitus.

The mask shall allow clearance of vomitus from the mask {Objective, without violating CB integrity} such that safety of flight and mission accomplishment are not compromised.

3.2.2.27 Physiological Burden.

The mask shall cause no excessive physiological burden which would adversely affect mission completion.

3.2.2.28 Explosive Atmosphere.

All mask components shall operate in a flammable atmosphere without causing an explosion.

3.2.3 Protective Hood.

The mask shall include a protective hood that shall provide agent and particulate protection for the head and neck (shoulder line and above) consistent with other mask components. The protective hood shall provide secure interface with the mask and be compatible with the helmets and Aircrew Flight equipment in Appendix D without causing hot spots. The protective hood shall not influence protection factor criteria or fit factor using the JSMLT or M41. The protective hood shall minimize gathering and bunching when worn with a helmet and decrease bellowing effects that allow hazardous gas and vapor to become trapped under the hood. The protective hood shall minimize physiological burden on the wearer.

3.2.4 Carrier.

Provide a water-resistant carrier capable of containing at least the following items: Mask Assembly

(including the C2A1 canister, protective hood, microphone assembly, faceform, and optical correction assembly if issued), inline particulate filter, hose assembly, and any additional equipment or adapters required to interface with the Aircrew Flight equipment.

3.3 INTERFACE AND INTEROPERABILITY REQUIREMENTS.

The mask shall accommodate the following interfaces and interoperability requirements for the aircraft listed in Appendix C:

3.3.1 Operator Equipment.

The mask shall meet the following operator equipment interface requirements:

3.3.1.1. CB Garment Compatibility.

The mask shall be compatible with the CB garments in Appendix D.

3.3.1.2 Life Support Equipment.

3.3.1.2.1 Integration.

The mask shall be compatible with Aircrew Flight equipment in Appendix D.

3.3.1.2.2 Hearing Protection.

The mask when integrated with existing head-mounted personal/life support equipment in Appendix

D shall result in no more than a 3 decibels degradation of the measured one-third octave band hearing protection compared to the barefaced configuration.

3.3.1.3 Other Combat Equipment.

Be compatible with optical devices such as night vision goggles and the sighting systems to include:

binoculars and AN/AVS-9 aviator's night vision devices (NVD).

3.3.2 Mask Facepiece Sizes.

Provide a range of four mask sizes (XS,S,M,L) and five interchangeable nose cup sizes

(XS,S,M,L,XL) and two Valsalva devices (XS/S and M/L) determined by application of anthropometric data defining the smallest (2nd percentile female) through the largest (98th percentile male) personnel from the applicable user communities as described in MIL-HDBK-743.

3.3.3 Positive Pressure Regulators.

The mask shall filter and deliver aircraft regulator-supplied breathing gas in both pressure demand and positive pressure modes (Pressure Breathing for Altitude (PBA)). In some mission scenarios and emergencies, aircrews may employ a portable oxygen supply. In those instances, the mask shall integrate with portable oxygen systems and deliver filtered oxygen.

3.3.4 Communication System Integration.

The mask shall include a microphone that is compatible with the communication systems of the aircraft identified in Appendix C. The mask shall be compatible with the headsets identified in

Appendix D.

3.3.5 Control and Display Integration.

The mask shall permit effective aircrew use of the crew station/cabin controls and displays of the aircraft identified in Appendix C. This includes compatibility with all aircraft lighting (interior and exterior).

3.3.6 Donning.

Elements of the system required to complete head-eye respiratory-percutaneous CB protection shall be capable of being donned (unassisted) in 15 seconds or less {Objective, 9 seconds} by aircrew personnel during ground operations.

3.3.7 Doffing.

Elements capable of being doffed in flight must be able to be doffed by an unassisted aircrew member wearing flight gloves, CB protective gloves, and MOPP IV. All components of the system shall be capable of being doffed during decontamination processing with no transfer of contamination to the aircrew member, or to the personnel conducting the decontamination.

3.3.8 Compatibility with Crew Duties

The mask shall not interfere with the normal and emergency duties of the crewmembers for the aircraft identified in Appendix C.

3.4 SUPPORT AND OWNERSHIP REQUIREMENTS.

The mask shall possess the following life cycle ownership characteristics:

3.4.1 Reliability, Availability, and Maintainability (RAM).

M69 systems shall meet the requirements for system reliability, maintainability, and Availability when operating and performing the system functions.

3.4.1.1 Reliability.

Mission reliability is defined as the probability of successfully completing a mission of tm hours duration.

Aircrafts shall have a mission reliability [ R(tm) ] of 0.980 calculated as:

R(tm) = exp (-tm / MTBOMFhw)

Mission time is 12 hours (based on two missions). The M69’s Time Between Operational Mission

Failures (MTBOMF) for hardware (hw) is expected to be 792 hours.

3.4.1.2 Maintainability.

[1] All variants of the system shall have a Mean Corrective Maintenance Time (MCMT) of 30 minutes. MCMT includes all maintenance actions required to correct the malfunction, including preparation for test, troubleshooting, removal and replacement of components, repair, adjustment, functional test, etc. MCMT does not include maintenance or supply delays and elapsed time for preventive maintenance or fitting/sizing.

[2] All variants of the system shall have a Mean Preventive Maintenance Time (MPMT) of 60 minutes per 6 months. MPMT is defined as the total elapsed time (clock hours) to prevent malfunctions, including inspections, detections, or corrections of incipient failures either before they occur or before they develop into major defects, divided by the total number of preventive maintenance actions during a given period of time. MPMT does not include maintenance or supply delays or fitting/sizing.

[3] Initial fitting/sizing of all variants of the system shall not exceed 45 minutes.

[4] Unserviceable system components (other than batteries) that are uncontaminated shall not require special handling or disposal procedures.

*3.4.1.3 Availability.

Operational Availability (AO) will be 0.94 {Objective, 0.99}. AO will be based on the formula:

AO = Operation Uptime / (Operation Uptime + Operation Downtime)

Uptime is defined as mask being available for immediate use to perform the designated mission for 12 hours minimum. Downtime is defined as mask not being available due to Maintenance Checks and

Service (PMCS) repair, waiting for repair parts, and maintenance repair.

3.4.2 General Safety.

Be electrically, physically, and mechanically safe to store, transport, operate, and maintain, and present no extraordinary health hazard to operator or support personnel in the intended environment throughout the product life cycle.

3.4.2.1 Flammability.

Be fire resistant, not melt, and be self-extinguishing within 5 seconds when subjected to open flames at 800° ± 50°C.

3.4.2.2 Toxic Safety.

Be constructed of non-toxic materials that would not harm the eyes, skin, and respiratory tracts of wearers, and shall not produce or off-gas harmful fumes or vapor, nor hazardous waste (applies to disposal of uncontaminated masks only) to protect against contact, inhalation/ingestion, and material breakdown toxicity.

3.4.2.3 Electrical Safety.

Present no shock hazard to personnel who must work in close proximity to exposed electrical circuitry.

3.4.2.4 Oxygen Compatibility

Materials shall be compatible with oxygen-enriched atmospheres up to 100% oxygen.

3.4.2.5 Tools, Support and Equipment

To the maximum extent possible, the mask shall be maintained using existing Department of Defense tools and support/test equipment.

3.4.3 Long Term Storage.

The mask shall meet the requirements of this specification after being stored in its packaged configuration for a period of not less than 10 years in all climatic types from -39°C to +52°C.

3.4.4 Marking.

Part marking shall conform to MIL-STD-130 or the alternate marking described below. The serial number and lot number of each mask shall be etched into the filter mount in both a two-dimensional bar code and human readable format. Alternate part marking:

The Lot Number shall be 10 characters long using the following format: AVOYYWWTZZ where

AVO=manufacturer code, YY=year of assembly, WW=workweek (01-52), T=mask size (X, S, M, or L), and ZZ=engineering code (00-99) (e.g., AVO0837M03).

The Serial Number shall be 13 digits long using the following format: YYWWDNNNNRRRR where

YY=year of assembly, WW=workweek, D=work day (Sunday = 1), NNNN=serial counter (0000-9999) and RRRR=the engineering "R" code that defines the pack out configuration (R000-R999) (e.g., 084530087R109). The two-dimensional bar code shall consist of CAGE code, serial number and lot number.

3.4.5 Unit Pack Size.

The mask unit pack shall not exceed 12 X 12 X 9.5 inches.

3.5 ENVIRONMENTAL REQUIREMENTS.

The mask shall operate under the following environmental conditions without loss of performance or physical deterioration:

3.5.1 Operating Temperature.

Temperatures ranging from -32°C to +49°C.

3.5.2. Humidity.

Relative humidity ranging from 5 to 100 percent.

3.5.3 Dust and Sand.

Blowing dust sand.

3.5.4 Salt Fog.

After exposure to salt fog environment.

3.5.5 Ozone.

After exposure to ozone.

3.5.6. Shock.

Deleted

3.5.7 Hazardous Environments

3.5.7.1 Contaminants.

After exposure to Battlefield Contaminants and Petroleum, Oils and Lubricants.

3.5.7.2 Stowage.

After exposure to stowage in an unventilated container.

3.5.8 Rough Handling.

After exposure to rough handling.

3.5.9 Temperature Shock.

After exposure to rapid changes in ambient temperatures at a minimum rate of 10°C per minute over the temperature ranges of -32°C to +49°C.

3.5.10 Rain.

After exposure to the effects of blowing rain.

3.5.11 Altitude.

From Mean Sea Level to 40,000 feet.

3.5.12 Solar Radiation.

After exposure to solar radiation at a rate of 355 BTU/ft²/hr at 49°C for 10, 24-hour cycles.

3.5.13 Electromagnetic Interference (EMI).

The communication-electronic subsystems and associated interfaces of the mask and accessories shall conform to the performance requirements for CS 114 (Curve 5), CS115, CS116, RS101, RS105 and

RS103 of MIL-STD-461F for all applications. If the mask contains actively powered circuitry, it shall also comply with RE101 and RE102.

3.5.14 Electrostatic and Electromagnetic Pulse.

The mask and accessories shall comply with MIL-STD-464C, including Electromagnetic Pulse

(EMP) and Electrostatic Discharge (ESD), when used in any platforms listed within Appendix C. The mask shall not be susceptible to or be a source of electrostatic discharge.

4. VERIFICATION

4.1 Methods of Verification.

Methods used to accomplish verification include:

(a) Analysis - An element of verification that utilizes established technical or mathematical models or simulations, algorithms, charts, graphs, circuit diagrams, or other scientific principles and procedures to provide evidence that stated requirements were met.

(b) Demonstration - An element of verification that involves the actual operation of an item to provide evidence that the required functions were accomplished under specific scenarios. The items may be instrumented and performance monitored.

(c) Examination - An element of verification that is generally nondestructive and typically includes the use of sight, hearing, smell, touch, and taste; simple physical manipulations; and mechanical and electrical gauging and measurement.

(d) Test - An element of verification that determines by technical means the properties or functional capabilities of items and involves the application of established scientific principles and procedures.

4.1.2 Verification Alternatives.

The manufacturer may propose alternative test methods, techniques, or testing equipment, including the application of statistical process control, tool control, or cost-effective sampling procedures, to verify product performance. Under no circumstances shall an application of these alternatives violate or circumvent the original intent to verify the specified characteristic of interest. See the contract for any approved alternatives that may replace any verification specifically required or referenced in or by this specification.

TABLE III. Inspection / Verification Requirements

Legend: A – Analysis E – Examination T – Test D – Demonstration N/A – Not applicable

Requirement Verification Method

Req. Par. # Title A E T D Ver. Par.

3.2 OPERATING REQUIREMENTS N/A N/A N/A N/A 4.5.1

3.2.1 Filters X X 4.5.1.1

3.2.2 Mask Requirements N/A N/A N/A N/A

3.2.2.1 Mask CB Protection X 4.5.1.2

3.2.2.2 Material Level CB Protection X 4.5.1.3

3.2.2.3 CB Protection (Protection Factor) X 4.5.1.4

3.2.2.4 Fit Factor X X 4.5.1.5

3.2.2.5 Breathing N/A N/A N/A N/A

3.2.2.5.1 Hypoxia Protection X X 4.5.1.6

3.2.2.5.2 Breathing Resistance X 4.5.1.7

3.2.2.5.3 Decompression N/A N/A N/A N/A

3.2.2.5.3.1 Oxygen Delivery X 4.5.1.8

3.2.2.5.3.2 Pressure Spike X 4.5.1.8

3.2.2.6 Vision N/A N/A N/A N/A

3.2.2.6.1 Field of View X 4.5.1.9

3.2.2.6.2 Shatter Resistance X 4.5.1.10

3.2.2.6.3 Eye Protection X 4.5.1.11

3.2.2.6.4 Light Transmission X 4.5.1.12

3.2.2.6.5 Yellowness index X 4.5.1.13

3.2.2.6.6 Haze X 4.5.1.14

3.2.2.6.7 Abrasion Resistance X 4.5.1.15

3.2.2.6.8 Prismatic deviation X 4.5.1.16

3.2.2.6.9 Refractive power X 4.5.1.17

3.2.2.6.10 Distortion X X 4.5.1.18

3.2.2.6.11 Optical Correction X 4.5.1.19

Req. Par. # Title A E T D Ver. Par.

3.2.2.6.12 Laser Protection NA NA NA NA 4.5.1.20

3.2.2.6.13 Fogging X 4.5.1.21

3.2.2.6.14 Wind Blast X 4.5.1.22

3.2.2.7 Speech/Communications X X 4.5.1.23

3.2.2.8 Drinking Capability N/A N/A N/A N/A

3.2.2.8.1 Liquid Intake and Protection X X 4.5.1.24

3.2.2.8.2 Liquid Intake Rate X 4.5.1.25

3.2.2.9 Wearability and Comfort X 4.5.1.26

3.2.2.10 Buckle Pull X 4.5.1.27

3.2.2.11 CO2 Content X 4.5.1.28

3.2.2.12 Detectability X X 4.5.1.29

3.2.2.13 Mask Leak Integrity N/A N/A N/A N/A

3.2.2.13.1 Chemical and Biological Leakage X 4.5.1.30

3.2.2.13.2 Pressure Breathing Leakage X 4.5.1.31

3.2.2.14 Water Survival N/A N/A N/A N/A

3.2.2.14.1 Escape Devices X X 4.5.1.32

3.2.2.14.2 Adverse Flotation X X 4.5.1.32

3.2.2.14.3 Passive Anti-Suffocation 4.5.1.32

3.2.2.14.4 Active Anti-Suffocation X X 4.5.1.32

3.2.2.15 Sanitization X X 4.5.1.33

3.2.2.16 Crash Survivability X 4.5.1.34

3.2.2.17 Rescue X 4.5.1.35

3.2.2.18 Head Supported Weight X 4.5.1.36

3.2.2.19 Aircraft Ingress/Egress X 4.5.1.37

3.2.2.20 Body Supported Weight X 4.5.1.38

3.2.2.21 Middle Ear Equalization X X 4.5.1.4

4.5.1.8

4.5.1.39

3.2.2.22 Filter Placement 4.5.1.40

3.2.3.23 Filter Mount X 4.5.1.41

3.2.2.24 Repetitive Mating NA NA NA NA 4.5.1.42

3.2.2.25 Stability X 4.5.1.43

3.2.2.26 Vomitus X X 4.5.1.44

3.2.2.27 Physiological Burden X 4.5.1.45

3.2.2.28 Explosive Atmospheres X 4.5.1.46

3.2.3 Protective Hood X X 4.5.2.1

3.2.4 Carrier X X 4.5.1.48

3.3 INTERFACE AND INTEROPERABILITY REQUIREMENTS

3.3.1 Operator Equipment N/A N/A N/A N/A

3.3.1.1 CB Garment Compatibility X X 4.5.2.1

3.3.1.2 Life Support Equipment N/A N/A N/A N/A

3.3.1.2.1 Integration X 4.5.2.2

3.3.1.2.2 Hearing Protection X 4.5.2.3

3.3.1.3 Other Combat Equipment X 4.5.2.4

3.3.2 Mask Facepiece Sizes X X 4.5.2.5

Req. Par. # Title A E T D Ver. Par.

3.3.3 Positive Pressure Regulators X 4.5.2.6

3.3.4 Communication System Integration X 4.5.2.7

3.3.5 Control and Display Integration X 4.5.2.8

3.3.6 Donning X 4.5.2.9

3.3.7 Doffing X 4.5.2.10

3.3.8 Compatibility with Crew Duties X 4.5.2.11

3.4 SUPPORT AND OWNERSHIP REQUIREMENTS

3.4.1.1 Reliability X 4.5.3.1.1

3.4.1.2 Maintainability X 4.5.3.1.2

3.4.1.3 Availability X 4.5.3.1.3

3.4.2 General Safety X 4.5.3.2

3.4.2.1 Flammability X 4.5.3.3

3.4.2.2 Toxic Safety X 4.5.3.4

3.4.2.3 Electrical Safety X 4.5.3.5

3.4.2.4 Oxygen Compatibility X 4.5.3.6

3.4.2.5 Tools, Support and Test Equipment X 4.5.3.7

3.4.3 Long term storage X 4.5.3.8

3.4.4 Marking X 4.5.3.9

3.4.5 Unit Pack Size X 4.5.3.10

3.5 ENVIRONMENTAL REQUIREMENTS

3.5.1 Operating Temperature X 4.5.4.1

3.5.2 Humidity X 4.5.4.2

3.5.3 Sand & Dust X 4.5.4.3

3.5.4 Salt Fog X 4.5.4.4

3.5.5 Ozone X 4.5.4.5

3.5.6 Shock X 4.5.4.6

3.5.7 Environmental Hazards NA NA NA

3.5.7.1 Contaminants X 4.5.4.7.1

3.5.7.2 Stowage X 4.5.4.7.2

3.5.8 Rough Handling X 4.5.4.8

3.5.9 Temperature Shock X 4.5.4.9

3.5.10 Rain X 4.5.4.10

3.5.11 Altitude X X 4.5.4.11

3.5.12 Solar Radiation X 4.5.4.12

3.5.13 Electromagnetic Interference X 4.5.4.13

3.5.14 Electrostatic and Electromagnetic

Pulse

X 4.5.4.14

4.2 Classification of Inspections.

The inspection requirements specified herein are classified as follows:

(a) First article inspection (see 4.3)

(b) Conformance inspection (see 4.4)

4.3 First Article Inspection.

4.3.1 Sample.

Reserved.

4.3.2 Inspection Procedure.

Reserved.

4.3.3 Acceptance Criteria.

Reserved.

4.4 Conformance Inspection.

Conformance inspection shall include those inspections from Table III required in the contract (see

6.2). Failure of any assembly, device, component, or test specimen to meet any of the requirements in this specification shall be cause for rejection of the production lot represented.

4.5 Inspection Methods.

4.5.1 OPERATING REQUIREMENTS VERIFICATION.

The following shall be performed to verify conformance to the operating requirements:

4.5.1.1 Filters.

Mask filters shall be verified per MIL-PRF-51560.

4.5.1.2 Mask CB Protection.

Testing shall be conducted by a Government approved source. The following system level tests shall be conducted:

Simulant Agent Resistant Test Manikin (SMARTMAN) – conducted in accordance with

Appendix B.

4.5.1.3 Material Level CB Protection.

Test in accordance with dual flow AVLAG or equivalent swatch testing in TOP 8-2-501. GD, GB, HD and VX liquid shall be the chemical agents applied to each swatch at a loading of 10 gm/m².

4.5.1.4 CB Protection (Protection Factor).

Testing shall be performed using a corn oil aerosol or equivalent. The test chamber aerosol concentration shall be between 20 and 40 mg/m3 with a Mass Median Aerodynamic Diameter of 0.4 -

0.6 microns. The geometric standard deviation shall be less than 2.0. The test chamber shall be capable of maintaining spatial uniformity within +/- 5 percent in the vicinity of the respirator being tested. The challenge aerosol concentration shall not vary as a function of time more than +/- 10 percent over the duration of a single test (approximately 15 minutes). The full test procedures can be found in Appendix

A.

Testing will be performed, using expertly donned equipment, in the following equipment configurations:

(1) Mask and protective hood only

(2) Mask, protective hood, service operational configuration including flight helmet (reference

Appendix D) and optical devices (AV-9 night vision goggles as applicable)..

4.5.1.5 Fit Factor.

Analysis by similarity and/or testing shall be conducted using the Joint Service Mask Leakage Tester

(JSMLT) or M41 (PATS).

4.5.1.6 Hypoxia Protection.

Demonstration and testing of the mask shall be conducted in the altitude chamber to a maximum altitude of 40,000 feet MSL. Prior to manned testing, unmanned testing shall be conducted in a manner and under conditions necessary to assure the safety of test subjects and test personnel.

4.5.1.7 Breathing Resistance.

Mask breathing resistance shall be tested with the CRU-103/P and CRU-73/A regulators up to the service ceiling of the aircraft.

4.5.1.8 Decompression

Testing shall be conducted using an unmanned test fixture for 1 second decompression testing.

Testing shall be conducted using manned human subjects for 7 second decompression testing. Data shall be recorded during the decompression and the subsequent descent. The mask shall first be tested using a head form with simulated lungs or breathing simulator. Following the decompression, the mask will be evaluated to ensure that oxygen is being delivered at the pressure and concentration appropriate for the post-decompression cabin altitude; that inner ear equalization can be performed effectively

(singled handed with gloves); that demist is being provided adequately to permit safety of flight; and that there is no visible damage to the mask that would compromise CB protection.

4.5.1.9 Field of View.

Measurements shall be taken using a Haag-Streit Perimeter or equivalent. The target stimulus will be a high contrast, 1 mm diameter circle of white light which is projected on a hemisphere at a distance of

33 cm from the test subject’s eye. The stimulus luminance shall be greater than 50 footlamberts against a background luminance of 0.25 footlamberts or less. Meridional measurements will be made monocularly for the left and right eyes at 15 degree intervals. Overlapping field-of-view shall be obtained from overlapping areas of the left and right eyes. Fixation points on the mask shall be placed along the primary lines of sight of the subjects to assist in retaining alignment during the measurements and to match the test participant’s Interpupilary Distances (IPD).

4.5.1.10 Shatter Resistance.

Mask lens shall be tested for impact resistance in accordance with ANSI Z87.1 using a 25.3 mm steel ball dropped from a height of 127 cm onto the convex side of the lens. Testing shall be conducted in the as-worn position.

4.5.1.11 Eye Protection.

The test shall be a V0 test conducted in accordance with MIL-STD-662 using a 0.15 caliber, 5.8 grain, T37 shaped projectile. The projectile velocity shall be between 640 to 660 feet per second, inclusive. {Objective, the lens will pass the V0 test using the 0.22 caliber, 17.0 grain, T37 shaped projectile at a velocity of 550 to 560 feet per second.} The facepiece assembly shall be mounted on an

Alderson 50th percentile male headform in the as-worn position. The witness sheet conforming to the witness plate for transparent armor in MIL-STD-662 shall be mounted within two inches of the eyelens behind the area of impact. The sample shall be hit once at normal incidence within a 1-inch diameter of a point centered over the eye (32 mm horizontally from the centerline of the facepiece assembly). The sample shall be considered a failure if witness sheet is punctured or if the sample is cracked.

4.5.1.12 Light Transmission.

Light transmission shall be measured for photopic transmittance using a Photo Research Photometer, Model 1980, and a gamma scientific standard lamp, Model RS-10.

4.5.1.13 Yellowness Index.

Measure the Yellowness Index (YI) of the eyelens in accordance with ASTM E313, using equation 1.

4.5.1.14 Haze.

Measure haze using a spectrophotometer in accordance with ASTM D 1003, Procedure B.

4.5.1.15 Abrasion Resistance.

Mask lenses shall be tested for abrasion in accordance with ASTM D1044 using a CS-10F wheel at

50 revolutions and 500 gram weight. Test of haze in accordance with 4.5.1.14 after abrasion.

4.5.1.16 Prismatic Deviation.

Measure prismatic deviation in accordance with ANSI Z87.1. Measurements of the horizontal and vertical deviation shall be made at the center points. Testing shall be conducted in the as-worn position.

4.5.1.17 Refractive Power.

The refractive power shall be measured using a lensometer or focimeter which is calibrated in units of 0.01 diopter or smaller and has a maximum range of +\- 0.30 diopter or larger. The mask shall be positioned in the focimeter approximately as worn and measurements taken as the left and right center points. Testing shall be conducted in the as-worn position.

4.5.1.18 Distortion.

Distortion shall be evaluated by subjective visual inspection through an Ann Arbor 60-line optical tester or equivalent. Optical distortion of the CVA, as defined in EA-M-10003A, of the test sample shall be determined by inserting the sample into the Ann Arbor test apparatus specified in Figure 1, with the inside surface of the sample closest to the inspector (sample inspected as worn). Samples shall be inspected through a 90 degree rotation, relative to the striped pattern. Visual results are to be compared to the distortion samples in Figure 2.

A = The distance that results in 14 to 16 stripes visible through the eye piece without a test sample loaded.

B = 115 mm The distance from the center of the sample lens being inspected back to the center of the magnifying lens.

4.5.1.19 Optical Correction.

Verify conformance by demonstration.

4.5.1.20 Laser Protection.

Reserved.

4.5.1.21 Fogging.

Resistance to fogging shall be demonstrated during evaluations in a controlled environment involving human subjects where lens fogging may occur. During the field trial, resistance to fogging shall be demonstrated under ambient, uncontrolled conditions. Laboratory and field demonstration will be conducted over a range of temperatures (-32°C to +52°C).

4.5.1.22 Windblast.

The mask shall be evaluated during windblast testing as applicable to aircraft listed in Appendix C.

The eye protection portion of the mask shall be exposed to a windblast velocity of 150 +/- 10 KEAS.

4.5.1.23 Speech/Communications.

Verify conformance by demonstration of electrical compatibility and field trial (Appendix E). Verify the integrity of the mask seal for speech during protection factor testing.

4.5.1.24 Liquid Intake and Protection.

Protection while drinking shall be assessed during Protection Factor testing and/or during field trial

(Appendix E).

FIGURE 2. Optical Distortion Standards - Continued

4.5.1.25 Liquid Intake Rate.

Verify conformance by demonstration.

4.5.1.26 Wearability and Comfort.

Verify conformance by demonstration and field trial (Appendix E).

4.5.1.27 Buckle Pull.

Straps with the buckles will be cut off of the faceblank. An Instron 1125 machine and data processor or equivalent will be used for the test. Hydropneumatic flat-faced grips will be used to load and hold the straps. The buckle will be placed in the upper jaw, and the rubber end will be placed in the lower jaw.

The Instron will separate the two ends at a rate of 20 inches per minute. The force in pounds that it takes to pull the buckle out of the rubber will be recorded.

4.5.1.28 CO2 Content.

Carbon dioxide (CO2) content of inhaled air will be assessed using a breathing simulator and a dummy headform. The unmanned test set-up will be a modified version of the carbon dioxide test procedures utilized in EN136. A respirator will be fitted securely to a Sheffield dummy head. Air will be supplied to the headform using a breathing pump adjusted to deliver a 2.0 L tidal breath at a rate of

25 breaths/min (minute volume of 50 L/min) with the exhaled air supplied with a carbon dioxide (CO2) content of 5% by volume. The CO2 supplied to the exhaled air pathway will be controlled using a flowmeter, a compensating bag, and a non-return valve. Carbon dioxide content of the inhaled air will be measured during the inhalation cycle of the breathing simulator from a 100 ml sample taken from the mouth opening of the headform. Approximately four minutes of inhaled CO2 content sampling will be recorded on-line for each mask after a constant CO2 content in the inhaled air is reached.

4.5.1.29 Detectability.

Verify conformance by visual examination and demonstration.

4.5.1.30 Chemical and Biological Leakage.

Test the facepiece assembly, minus head harness and using adapters (bungs) to seal the outlet valve assembly and filter mount, on the M14, JSMLT, ATI TDA-99M, ATI TDA-99B or equivalent mask leakage tester. Conduct mask leakage test. Exhalation valve leakage and drink train leakage shall be measured using the JSMLT, ATI TDA-99M, ATI TDA-99B or equivalent mask leakage tester with the appropriate adapter.

4.5.1.31 Pressure Breathing Leakage

Verification shall be accomplished by test with each size mask properly fitted to a test subject. With the test participant holding his/her breath, the required pressure shall be applied within the mask.

Outboard leakage flow shall be measured while maintaining the pressure, and shall not exceed the specified leakage.

4.5.1.32 Water Survival.

Water survival capabilities shall be evaluated using water of capacity to submerge individual and aircrew equipment. Water survival testing shall verify that the mask does not cause adverse flotation characteristics (i.e. face down attitude) in water and the mask allows proper use of water survival equipment techniques and rescue procedure.

4.5.1.33 Sanitization.

Ease of cleaning/sanitization shall be evaluated during the field trial. Cleaning shall be accomplished by aircrew flight equipment personnel as appropriate for each aircraft type. Sanitization shall be performed in accordance with the technical manual. After cleaning, the mask will be visually inspected for damage and tested for leakage using the test procedure in section 4.5.1.30.

4.5.1.34 Crash Survivability.

Crash survivability shall be assessed using the test methodology in USAARL Report 96-1.

4.5.1.35 Rescue.

Compatibility with aircrew SAR procedures and equipment, to include visibility of, and access to, SAR equipment shall be evaluated during the field trial (Appendix E).

4.5.1.36 Head Supported Weight.

The head supported weight shall be measured to 0.1 lb accuracy. This measurement includes the hood and mask only.

4.5.1.37 Aircraft Ingress/Egress.

Suitability for rapid, ingress into the aircraft and connection of life support equipment for aircraft in

Appendix C shall be evaluated during the field trial (Appendix E). Suitability for ground and water emergency egress procedures for the aircraft from Appendix C shall be assessed during the field trial

(Appendix E) to ensure non-interference.

4.5.1.38 Body Supported Weight.

Weight shall be measured to 0.1 lb accuracy.

4.5.1.39 Middle Ear Equalization.

Middle-ear equalization shall be demonstrated during the protection factor testing per Appendix A, in the altitude chamber testing, and during the field trial (Appendix E).

4.5.1.40 Filter Placement.

Reserved.

4.5.1.41 Filter Mount.

Verify conformance by examination. Filter compatibility shall be assessed during mask level agent testing (Appendix B), protection factor testing (Appendix A), and field trial (Appendix E).

4.5.1.42 Repetitive Mating.

Reserved.

4.5.1.43 Stability.

Stability shall be evaluated during flight testing and field trial (Appendix E) in both the helmeted and non-helmeted configuration.

4.5.1.44 Vomitus.

The ability to discharge vomit shall be assessed during fit factor testing. A headform tester may be substituted for test participants. CB integrity shall be assessed following vomiting.

4.5.1.45 Physiological Burden.

Verify conformance during field trial (Appendix E).

4.5.1.46 Explosive Atmosphere

The mask shall be subjected to an explosive atmosphere in accordance with MIL-STD-810G, Method

511.5, Procedure I or equivalent.

4.5.1.47 Protective Hood.

Reserved

4.5.1.48 Carrier.

Verify conformance by demonstration.

4.5.2 INTERFACE AND INTERCHANGEABILITY REQUIREMENTS…