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Designation: F3227/F3227M − 26Standard Specif i cation forEnvironmental Systems in Aircraft 1This standard is issued under the f i xed designation F3227/F3227M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specif i cation covers international standards for theenvironmental system aspects of airworthiness and design for“small” aircraft.1.2 The applicant for a design approval must seek theindividual guidance of their respective CAA body concerningthe use of this specif i cation as part of a certif i cation plan. Forinformation on which CAA regulatory bodies have acceptedthis specif i cation (in whole or in part) as a means of compli-ance to their Small Aircraft Airworthiness regulations (herein-after referred to as “the Rules”), refer to the ASTM F44webpage (www.ASTM.org/COMMITTEE/F44.htm), whichincludes CAA website links. Annex A1 maps the Means ofCompliance described in this specif i cation to EASA CS-23,amendment 5, or later, and FAA 14 CFR Part 23, amendment64, or later.1.3 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard. The values stated ineach system are not necessarily exact equivalents; therefore, toensure conformance with the standard, each system shall beused independently of the other, and values from the twosystems shall not be combined.1.4 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety, health, and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 Following is a list of external standards referencedthroughout this specif i cation; the earliest revision acceptablefor use is indicated. In all cases later document revisions areacceptable if shown to be equivalent to the listed revision, or ifotherwise formally accepted by the governing civil aviationauthority; earlier revisions are not acceptable.2.2 ASTM Standards: 2F3060 Terminology for AircraftF3061/F3061M Specif i cation for Systems and Equipment inAircraftF3083/F3083M Specif i cation for Emergency Conditions,Occupant Safety and AccommodationsF3117/F3117M Specif i cation for Crew Interface in AircraftF3230 Practice for Safety Assessment of Systems andEquipment in Small AircraftF3233/F3233M Specif i cation for Flight and Navigation In-strumentation in Aircraft2.3 EASA Standard: 3CS-23 Normal, Utility,Aerobatic and CommuterAeroplanesSIB 2020-01R1 Carbon Monoxide Risk in SmallAeroplanesand Helicopters2.4 FAA Standard: 414 CFR Part 23 Airworthiness Standards: Normal CategoryAirplanesSAIB CE-10-19 Engine Exhaust and Carbon MonoxideDetectors2.5 SAE Standard: 5SAE AIR825/4, Rev A Chemical Oxygen Systems3. Terminology3.1 Terminology specif i c to this specif i cation is providedbelow. For general terminology, refer to Terminology F3060.3.2 Def i nitions of Terms Specif i c to This Standard:3.2.1 BTPS, n—BTPS stands for “Body Temperature andPressure, Saturated;” this is def i ned to be a temperature of37 °C and a pressure equal to the ambient pressure to which the1 This specif i cation is under the jurisdiction ofASTM Committee F44 on GeneralAviation Aircraft and is the direct responsibility of Subcommittee F44.50 onSystems and Equipment.Current edition approved July 1, 2026. Published July 2026. Originally approvedin 2017. Last previous edition approved in 2025 as F3227/F3227M – 25. DOI:10.1520/F3227_F3227M-26.2 For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at www.astm.org/contact. For Annual Book ofASTM Standards volume information, refer to the standard’s Document Summarypage on the ASTM website.3 Available from European Union Aviation Safety Agency (EASA), Konrad-Adenauer-Ufer 3, D-50668 Cologne, Germany, https://www.easa.europa.eu.4 Available from Federal Aviation Administration (FAA), 800 IndependenceAve., SW, Washington, DC 20591, http://www.faa.gov.5 Available from SAE International (SAE), 400 Commonwealth Dr., Warrendale,PA 15096, http://www.sae.org.Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1