ASTM F3572-22

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.
Designation: F3572 − 22
Standard Practice for
Additive Manufacturing – General Principles – Part
Classifications for Additive Manufactured Parts Used in
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Aviation
This standard is issued under the fixed designation F3572; 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.
INTRODUCTION
The use of additive manufacturing (AM) technology allows designs that may not be achieved with
traditionalmanufacturingmethods.ItisimportanttounderstandtheriskassociatedwiththeAMusage
by understanding the consequence of failure (including the loss of intended function) of the usage.
Such information can be beneficial in establishing consistent manufacturing, inspection, or qualifi-
cation processes relative to a defined risk scale, which can serve as supporting data when seeking
regulatory approval of an AM part. A part classification scheme based on a part’s consequence of
failure can provide a consistent risk metric. Without carefully defined part classes, the ability to
accurately gauge the consequence of failure associated with additively manufactured aviation parts
within and across programs, projects, and suppliers becomes exceedingly difficult, resulting in
mitigations that are either not commensurate or inconsistent. The part classification scheme
documented here does not affect a part’s functional requirements, but rather is used to group additive
manufacturingaviationpartsintocategorieswhichcanbeusedindownstreamstandards.Forexample,
this classification scheme can be used in material and process specifications to determine the
appropriate levels of process control, thermal post processing, qualification, and inspection to ensure
AM parts meet their application requirements. This classification scheme does not specify how the
classification is used in any downstream processes. The use of the classification shall be left to the
cognizant engineering or production entities, or downstream documents which reference this standard.
1. Scope 1.5 The part classification metric could be utilized by the
engineering, procurement, non-destructive inspection, testing,
1.1 This practice is intended to be used to assign part
qualification, or certification processes used for AM aviation
classifications across the aviation industries that use AM to
parts.
produce parts.
1.6 The classification scheme in this practice establishes a
1.2 This practice is applicable to all AM technologies
consistent methodology to define and communicate the conse-
defined in ISO/ASTM 52900 used in aviation.
quence of failure associated with AM aviation parts.
1.3 This practice is intended to be used to establish a metric
1.7 This practice is not intended to supersede the require-
for AM parts in downstream documents.
ments and definitions of the applicable regulations or policies,
including but not limited to the ones listed in Annex A1.
1.4 This practice is not intended to establish criteria for any
downstream processes, but rather to establish a metric that
1.8 Tables A1.1-A1.3 align the existing regulations and
these processes can use.
guidance with the four part classes established herein.
However, this alignment should not be construed as an align-
ment of the existing regulations to each other.
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This specification is under the jurisdiction of ASTM Committee F42 on
1.9 The material or process, or both, in general does not
Additive Manufacturing Technologies and is the direct responsibility of Subcom-
affect the consequence of failure of a part, therefore the
mittee F42.07 on Applications.
classification scheme defined in this document may be used
Current edition approved July 1, 2022. Published August 2022. DOI: 10.1520/
F3572-22. outside AM.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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F3572 − 22
TABLE 1 Part Classifications
Consequence of
Classification Non-exhaustive Examples
Failure
Part whose failure can directly affect continued safe flight and landing
A High Part whose failure can result in serious or fatal injury to passengers or cabin crews
Part whose failure requires exceptional piloting skill of flight crew to compensate
Part whose failure can indirectly affect continued safe flight and landing
B Medium Part whose failure can result in minor injury to flight crew, passengers, or cabin crews
Part whose failure can result in significant increase in workload of flight crew
Part whose
...