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ASTM F3338-18

(Specification)

Standard Specification for Design of Electric Propulsion Units for General Aviation Aircraft

Standard Specification for Design of Electric Propulsion Units for General Aviation Aircraft

SCOPE
1.1 This specification covers minimum requirements for the design of Electric Propulsion Units (EPU).  
1.2 Distributed propulsion is not excluded; however, additional requirements will be needed to address the additional issues that distributed propulsion can create. Some of those issues may include: use of a common motor controller/inverter, segregated electric harnesses, cooling systems, electric power supplies, and others.  
1.3 This specification does not address all of the requirements that may be necessary for possible hybrid configurations where an EPU and a combustion engine drive a common thruster. This specification may be used for the EPU aspects with supplemental requirements for the thruster and the combustion engine.  
1.4 This specification does not include the requirements for EPUs that include gearboxes, thrusters, liquid cooling/lubrication, or any energy storage systems. This specification may be used for the EPU base aspects with supplemental requirements for these additional features. This version of this ASTM specification also does not address all of the requirements necessary for configurations of motor driven ducted-fans. It is anticipated that the fan would be subject to parts of 14 CFR 33 or CS-E and/or 14 CFR 35 or CS-P, or equivalent, in particular blade-off and bird strike. These would be conducted on the fan as a unit (including motor) rather than on motor or fan alone.  
1.5 The applicant for a design approval shall seek the individual guidance of their respective civil aviation authority (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 general aviation aircraft airworthiness regulations (hereinafter referred to as “the Rules”), refer to ASTM Committee F39 webpage (www.ASTM.org/COMITTEE/F39.htm), which includes CAA website links.  
1.6 When applicable, this specification may be used for EPUs with a fixed-pitch propeller or fan. These configurations may be type-certificated as an EPU including a thruster. There may be additional requirements not currently included in this specification for this type configuration. In addition, 5.24 is included as a test requirement for the EPU. That section recognizes that the EPU may not have an integral thruster but it must be tested with a representative load on the drive shaft to assure EPU ability to operate properly with static and dynamic loads.  
1.7 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.  
1.8 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.  
1.9 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-Nov-2018
ICS
49.050 - Aerospace engines and propulsion systems
Technical Committee
F39 - Aircraft Systems
Drafting Committee
F39.05 - Design, Alteration, and Certification of Electric Propulsion Systems
Current Stage
Ref Project

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ASTM F3338-18 - Standard Specification for Design of Electric Propulsion Units for General Aviation AircraftASTM F3338-18 - Standard Specification for Design of Electric Propulsion Units for General Aviation Aircraft
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ASTM F3338-18 - Standard Specification for Design of Electric Propulsion Units for General Aviation Aircraft
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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:F3338 −18
Standard Specification for
Design of Electric Propulsion Units for General Aviation
1
Aircraft
This standard is issued under the fixed designation F3338; 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 Rules”), refer to ASTM Committee F39 webpage
(www.ASTM.org/COMITTEE/F39.htm), which includes CAA
1.1 This specification covers minimum requirements for the
website links.
design of Electric Propulsion Units (EPU).
1.6 When applicable, this specification may be used for
1.2 Distributed propulsion is not excluded; however, addi-
EPUs with a fixed-pitch propeller or fan. These configurations
tional requirements will be needed to address the additional
may be type-certificated as an EPU including a thruster. There
issues that distributed propulsion can create. Some of those
may be additional requirements not currently included in this
issuesmayinclude:useofacommonmotorcontroller/inverter,
specification for this type configuration. In addition, 5.24 is
segregated electric harnesses, cooling systems, electric power
included as a test requirement for the EPU. That section
supplies, and others.
recognizes that the EPU may not have an integral thruster but
it must be tested with a representative load on the drive shaft
1.3 This specification does not address all of the require-
to assure EPU ability to operate properly with static and
ments that may be necessary for possible hybrid configurations
dynamic loads.
where an EPU and a combustion engine drive a common
thruster. This specification may be used for the EPU aspects
1.7 The values stated in inch-pound units are to be regarded
with supplemental requirements for the thruster and the com-
as standard. The values given in parentheses are mathematical
bustion engine.
conversions to SI units that are provided for information only
and are not considered standard.
1.4 This specification does not include the requirements for
EPUs that include gearboxes, thrusters, liquid cooling/ 1.8 This standard does not purport to address all of the
lubrication, or any energy storage systems. This specification
safety concerns, if any, associated with its use. It is the
may be used for the EPU base aspects with supplemental responsibility of the user of this standard to establish appro-
requirements for these additional features. This version of this priate safety, health, and environmental practices and deter-
ASTM specification also does not address all of the require- mine the applicability of regulatory limitations prior to use.
ments necessary for configurations of motor driven ducted- 1.9 This international standard was developed in accor-
fans. It is anticipated that the fan would be subject to parts of dance with internationally recognized principles on standard-
14 CFR 33 or CS-E and/or 14 CFR 35 or CS-P, or equivalent, ization established in the Decision on Principles for the
in particular blade-off and bird strike. These would be con- Development of International Standards, Guides and Recom-
ducted on the fan as a unit (including motor) rather than on mendations issued by the World Trade Organization Technical
motor or fan alone.
Barriers to Trade (TBT) Committee.
1.5 The applicant for a design approval shall seek the
2. Referenced Documents
individual guidance of their respective civil aviation authority
2
(CAA) body concerning the use of this specification as part of 2.1 Code of Federal Regulations:
a certification plan. For information on which CAAregulatory 14 CFR 33 Airworthiness Standards: Aircraft Engines
bodies have accepted this specification (in whole or in part) as 14 CFR 35 Airworthiness Standards: Propellers
3
a means of compliance to their general aviation aircraft
2.2 EASA Standards:
airworthiness regulations (hereinafter referred to as “the
CS-E Engines
CS-P Propellers
1
ThisspecificationisunderthejurisdictionofASTMCommitteeF39onAircraft
2
Systems and is the direct responsibility of Subcommittee F39.05 on Design, Available from U.S. Government Publishing Office (GPO), 732 N. Capitol St.,
Alteration, and Certification of Electric Propulsion Systems. NW, Washington, DC 20401, http://www.gpo.gov.
3
Current edition approved Dec. 1, 2018. Published December 2018. DOI: Available from European Aviation Safety Agency (EASA), Postfach 10 12 53,
10.1520/F3338–18. D-50452 Cologne, Germany, http://www.easa.europa.eu.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
F3338−18
4
2.3 IEC Standards: 3.1.9 shaftpower(orsimplypower)
...

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SCOPE
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4.4.1 In-line full flow non-intrusive inductive metal detector with no moving parts.  
4.4.2 Det...
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