ASTM F3227/F3227M-17

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Designation:F3227/F3227M −17
Standard Specification for
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Environmental Systems in Small 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 F3061/F3061MSpecification for Systems and Equipment in
Small Aircraft
1.1 This specification covers international standards for the
F3083/F3083M Specification for Emergency Conditions,
environmental system aspects of airworthiness and design for
Occupant Safety and Accommodations
“small” aircraft.
F3230Practice for Safety Assessments of Systems and
1.2 The applicant for a design approval must seek the
Equipment in Small Aircraft
individual guidance of their respective CAA body concerning
F3233/F3233MSpecification for Instrumentation in Small
the use of this specification as part of a certification plan. For
Aircraft
information on which CAA regulatory bodies have accepted
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2.3 SAE Standards:
this specification (in whole or in part) as a means of compli-
SAE AIR825/4, Rev AChemical Oxygen Systems
ance to their SmallAircraftAirworthiness regulations (herein-
after referred to as “the Rules”), refer to the ASTM F44
3. Terminology
webpage (www.ASTM.org/COMMITTEE/F44.htm) which in-
cludes CAA website links.
3.1 Terminology specific to this specification is provided
below. For general terminology, refer to Terminology F3060.
1.3 The values stated in either SI units or inch-pound units
are to be regarded separately as standard. The values stated in
3.2 Definitions of Terms Specific to This Standard:
each system may not be exact equivalents; therefore, each
3.2.1 aircraft type code, n—an aircraft type code (ATC) is
system shall be used independently of the other. Combining
defined by considering both the technical considerations re-
values from the two systems may result in non-conformance
garding the design of the aircraft and the airworthiness level
with the standard.
established based upon risk-based criteria; the method of
1.4 This standard does not purport to address all of the
defining an ATC applicable to this specification is defined in
safety concerns, if any, associated with its use. It is the
Specification F3061/F3061M.
responsibility of the user of this standard to establish appro-
3.2.2 BTPS, n—BTPS stands for “Body Temperature and
priate safety and health practices and determine the applica-
Pressure, Saturated;” this is defined to be a temperature of
bility of regulatory limitations prior to use.
37°Candapressureequaltotheambientpressuretowhichthe
body is exposed minus 6.27kPa [47mmHg]; this is the
2. Referenced Documents
tracheal pressure displaced by water vapor pressure when the
2.1 Following is a list of external standards referenced
breathed air becomes saturated with water vapor at 37°C.
throughout this specification; the earliest revision acceptable
3.2.3 chemical oxygen generator, n—a chemical oxygen
for use is indicated. In all cases later document revisions are
acceptableifshowntobeequivalenttothelistedrevision,orif generator is defined as a device which produces oxygen by
chemical reaction; for more detailed information, refer to SAE
otherwise formally accepted by the governing civil aviation
authority; earlier revisions are not acceptable. AIR825/4.
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2.2 ASTM Standards: 3.2.4 continued safe flight and landing, n—continued safe
F3060Terminology for Aircraft flight and landing as applicable to this specification is defined
in Specification F3061/F3061M.
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ThisspecificationisunderthejurisdictionofASTMCommitteeF44onGeneral
3.2.5 probable, adj—probable means that the event is an-
Aviation Aircraft and is the direct responsibility of Subcommittee F44.50 on
ticipated to occur one or more times during the entire opera-
Systems and Equipment.
tional life of each aircraft.
Current edition approved Feb. 15, 2017. Published March 2017. DOI: 10.1520/
F3227_F3227M-17.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
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Standards volume information, refer to the standard’s Document Summary page on AvailablefromSAEInternational(SAE),400CommonwealthDr.,Warrendale,
the ASTM website. PA 15096, http://www.sae.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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F3227/F3227M−17
3.2.6 STPD, n—STPD stands for “Standard Temperature taminated air to enable the flight crew members to perform
and Pressure, Dry.”This is defined to be a temperature of 0°C their duties without undue discomfort or fatigue.
and a pr
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