ASTM F3227/F3227M-21

Standard Specification for Environmental Systems in Aircraft

SCOPE
1.1 This specification covers international standards for the environmental system aspects of airworthiness and design for “small” aircraft.  
1.2 The applicant for a design approval must seek the individual guidance of their respective CAA body concerning the use of this specification as part of a certification plan. For information on which CAA regulatory bodies have accepted this specification (in whole or in part) as a means of compliance to their Small Aircraft Airworthiness regulations (hereinafter referred to as “the Rules”), refer to the ASTM F44 webpage (www.ASTM.org/COMMITTEE/F44.htm) which includes CAA website links.  
1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.  
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Historical
• Publication Date: 30-Apr-2021
• ICS: 49.020 - Aircraft and space vehicles in general
• Technical Committee: F44 - General Aviation Aircraft
• Drafting Committee: F44.50 - Systems and Equipment

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:F3227/F3227M −21
Standard Specification for
1
Environmental Systems in Aircraft
ThisstandardisissuedunderthefixeddesignationF3227/F3227M;thenumberimmediatelyfollowingthedesignationindicatestheyear
of original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.
A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope otherwise formally accepted by the governing civil aviation
authority; earlier revisions are not acceptable.
1.1 This specification covers international standards for the
2
environmental system aspects of airworthiness and design for 2.2 ASTM Standards:
“small” aircraft. F3060Terminology for Aircraft
F3061/F3061MSpecification for Systems and Equipment in
1.2 The applicant for a design approval must seek the
Small Aircraft
individual guidance of their respective CAA body concerning
F3083/F3083M Specification for Emergency Conditions,
the use of this specification as part of a certification plan. For
Occupant Safety and Accommodations
information on which CAA regulatory bodies have accepted
F3117/F3117MSpecification for Crew Interface in Aircraft
this specification (in whole or in part) as a means of compli-
F3230 Practice for Safety Assessment of Systems and
ance to their SmallAircraftAirworthiness regulations (herein-
Equipment in Small Aircraft
after referred to as “the Rules”), refer to the ASTM F44
F3233/F3233MSpecification for Flight and Navigation In-
webpage (www.ASTM.org/COMMITTEE/F44.htm) which in-
strumentation in Aircraft
cludes CAA website links.
3
2.3 SAE Standard:
1.3 The values stated in either SI units or inch-pound units
SAE AIR825/4, Rev AChemical Oxygen Systems
are to be regarded separately as standard. The values stated in
each system are not necessarily exact equivalents; therefore, to
3. Terminology
ensure conformance with the standard, each system shall be
3.1 Terminology specific to this specification is provided
used independently of the other, and values from the two
below. For general terminology, refer to Terminology F3060.
systems shall not be combined.
3.2 Definitions of Terms Specific to This Standard:
1.4 This standard does not purport to address all of the
3.2.1 aircraft type code, n—an aircraft type code (ATC) is
safety concerns, if any, associated with its use. It is the
defined by considering both the technical considerations re-
responsibility of the user of this standard to establish appro-
garding the design of the aircraft and the airworthiness level
priate safety, health, and environmental practices and deter-
established based upon risk-based criteria; the method of
mine the applicability of regulatory limitations prior to use.
defining an ATC applicable to this specification is defined in
1.5 This international standard was developed in accor-
Specification F3061/F3061M.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the 3.2.2 BTPS, n—BTPS stands for “Body Temperature and
Development of International Standards, Guides and Recom- Pressure, Saturated;” this is defined to be a temperature of
mendations issued by the World Trade Organization Technical 37°Candapressureequaltotheambientpressuretowhichthe
Barriers to Trade (TBT) Committee. body is exposed minus 6.27kPa [47mmHg]; this is the
tracheal pressure displaced by water vapor pressure when the
2. Referenced Documents
breathed air becomes saturated with water vapor at 37°C.
2.1 Following is a list of external standards referenced 3.2.3 chemical oxygen generator, n—a chemical oxygen
throughout this specification; the earliest revision acceptable
generator is defined as a device which produces oxygen by
for use is indicated. In all cases later document revisions are chemical reaction; for more detailed information, refer to SAE
acceptableifshowntobeequivalenttothelistedrevision,orif
AIR825/4.
1 2
ThisspecificationisunderthejurisdictionofASTMCommitteeF44onGeneral For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Aviation Aircraft and is the direct responsibility of Subcommittee F44.50 on contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Systems and Equipment. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved May 1, 2021. Published May 2021. Originally the ASTM website.
3
approved in 2017. Last previous edition approved in 2020 as F3227/F3227M–20. AvailablefromSAEInternational(SAE),400CommonwealthDr.,Warrendale,
DOI: 10.1520/F3227_F3227M-21. PA 15096, http://www.sae.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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F3227/F3227M−21
3.2.4 continued
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: F3227/F3227M − 20 F3227/F3227M − 21
Standard Specification for
1
Environmental Systems in Aircraft
This standard is issued under the fixed designation F3227/F3227M; the number immediately following the designation indicates the year
of 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. Scope
1.1 This specification covers international standards for the environmental system aspects of airworthiness and design for “small”
aircraft.
1.2 The applicant for a design approval must seek the individual guidance of their respective CAA body concerning the use of
this specification as part of a certification plan. For information on which CAA regulatory bodies have accepted this specification
(in whole or in part) as a means of compliance to their Small Aircraft Airworthiness regulations (hereinafter referred to as “the
Rules”), refer to the ASTM F44 webpage (www.ASTM.org/COMMITTEE/F44.htm) which includes CAA website links.
1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each
system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used
independently of the other, and values from the two systems shall not be combined.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 Following is a list of external standards referenced throughout this specification; the earliest revision acceptable for use is
indicated. In all cases later document revisions are acceptable if shown to be equivalent to the listed revision, or if otherwise
formally accepted by the governing civil aviation authority; earlier revisions are not acceptable.
2
2.2 ASTM Standards:
F3060 Terminology for Aircraft
F3061/F3061M Specification for Systems and Equipment in Small Aircraft
F3083/F3083M Specification for Emergency Conditions, Occupant Safety and Accommodations
F3117/F3117M Specification for Crew Interface in Aircraft
F3230 Practice for Safety Assessment of Systems and Equipment in Small Aircraft
1
This specification is under the jurisdiction of ASTM Committee F44 on General Aviation Aircraft and is the direct responsibility of Subcommittee F44.50 on Systems
and Equipment.
Current edition approved Jan. 1, 2020May 1, 2021. Published February 2020May 2021. Originally approved in 2017. Last previous edition approved in 20172020 as
F3227/F3227M–17.–20. DOI: 10.1520/F3227_F3227M–20.10.1520/F3227_F3227M-21.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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F3227/F3227M − 21
F3233/F3233M Specification for Flight and Navigation Instrumentation in Aircraft
3
2.3 SAE Standard:
SAE AIR825/4, Rev A Chemical Oxygen Systems
3. Terminology
3.1 Terminology specific to this specification is provided below. For general terminology, refer to Terminology F3060.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 aircraft type code, n—an aircraft type code (ATC) is defined by considering both the technical considerations regarding the
design of the aircraft and the airworthiness level established based upon risk-based criteria; the method of defining an ATC
applicable to this specification is defined in Specification F3061/F3061M.
3.2.2 BTPS, n—BTPS stands for “Body Temperature and Pressure, Saturated;” this is defined to be a temperature of 37 °C and
a pressure equal to the ambient pressure to which the body is exposed minus 6.27 kPa [47 mmHg]; this is the tracheal press
...