ASTM F2506-22

Standard Specification for Design and Testing of Light Sport Aircraft Propellers

ABSTRACT
This specification covers the establishment of the minimum requirements for the design, testing, and quality assurance of fixed-pitch or ground adjustable propellers for light sport aircraft. The propeller may not have design features that have been shown to be hazardous or unreliable unless the suitability of each questionable design detail or part can be established by tests. Strength testing; stress measurement, fatigue strength, and fatigue analysis, endurance testing, and teardown inspection shall be performed to meet the requirements prescribed.
SCOPE
1.1 This specification covers the establishment of the minimum requirements for the design, testing, and quality assurance of fixed-pitch or ground adjustable propellers for light sport aircraft. These propellers are used on light aircraft, and could be used with engines conforming to Practice F2339.  
1.1.1 When applying the additions provided in Appendix X1, this specification also covers the establishment of the minimum requirements for the design, testing and quality assurance of in-flight adjustable propellers for light-sport aircraft.  
1.2 This specification is intended for use by manufacturers of propellers for light sport aircraft.  
1.3 This specification does not address the airframe installation requirements for propellers.  
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 to 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: Published
• Publication Date: 30-Sep-2022
• ICS: 49.050 - Aerospace engines and propulsion systems
• Technical Committee: F37 - Light Sport Aircraft
• Drafting Committee: F37.70 - Cross Cutting

Relations

• Refers: ASTM F2339-19a - Standard Practice for Design and Manufacture of Reciprocating Spark Ignition Engines for Light Sport Aircraft
• Effective Date: 01-Nov-2019
• Refers: ASTM F2339-19 - Standard Practice for Design and Manufacture of Reciprocating Spark Ignition Engines for Light Sport Aircraft
• Effective Date: 01-Apr-2019
• Refers: ASTM F2339-17 - Standard Practice for Design and Manufacture of Reciprocating Spark Ignition Engines for Light Sport Aircraft
• Effective Date: 01-Dec-2017
• Refers: ASTM F2339-06(2009) - Standard Practice for Design and Manufacture of Reciprocating Spark Ignition Engines for Light Sport Aircraft
• Effective Date: 01-Jan-2009
• Refers: ASTM F2339-06 - Standard Practice for Design and Manufacture of Reciprocating Spark Ignition Engines for Light Sport Aircraft
• Effective Date: 01-Jun-2006
• Refers: ASTM F2339-05 - Standard Practice for Design and Manufacture of Reciprocating Spark Ignition Engines for Light Sport Aircraft
• Effective Date: 01-Oct-2005
• Refers: ASTM F2339-04 - Standard Practice for Design and Manufacture of Reciprocating Spark Ignition Engines for Light Sport Aircraft
• Effective Date: 01-Aug-2004

Overview

ASTM F2506-22: Standard Specification for Design and Testing of Light Sport Aircraft Propellers establishes the minimum requirements for the design, testing, and quality assurance of fixed-pitch and ground adjustable propellers specifically for light sport aircraft. Developed by ASTM International, this standard supports manufacturers in ensuring that propellers used in light sport aviation are safe, reliable, and durable throughout their operational lifecycle. The specification also provides optional requirements for in-flight adjustable propellers when referenced.

The standard aims to deliver comprehensive criteria for propeller construction, materials evaluation, performance testing, and required documentation, supporting global harmonization for manufacturers and regulators alike.

Key Topics

• Design Requirements

  • Specifies minimum design needs to ensure safety and reliability
  • Requires proof that design features have not been shown to be hazardous or unreliable unless verified by tests

• Testing and Inspection

  • Outlines testing criteria such as strength testing, stress measurement, fatigue analysis, endurance tests, and teardown inspections
  • Requires specific test programs depending on whether propellers are wooden, composite, or metal

• Quality Assurance

  • Mandates manufacturers to implement quality assurance systems to ensure ongoing conformity to the established design
  • Includes requirements for manuals concerning operation, installation, and maintenance

• Documentation and Traceability

  • Requires clear identification marking on propellers including diameter, pitch, manufacturer, model, and serial number
  • Calls for detailed records about the propeller’s configuration, materials, and manufacturing processes to demonstrate compliance

• Scope and Limitations

  • Applies to manufacturers of propellers for light sport aircraft, including those with engines conforming to ASTM F2339
  • Does not address installation requirements on the aircraft airframe

Applications

ASTM F2506-22 is specifically targeted at manufacturers designing and producing propellers for light sport aircraft, ensuring propeller safety, performability, and durability. Key practical applications include:

• Propeller Development and Certification

  • Used by designers to validate new or modified propeller models, demonstrating conformance through required test programs

• Regulatory Compliance

  • Provides regulatory authorities with a consistent set of standards when certifying and inspecting light sport aircraft propellers

• Operational Safety

  • Supports the creation of operating and maintenance manuals for continued airworthiness by outlining required contents such as maintenance schedules, inspection procedures, and mandatory replacement intervals

• Aftermarket Support

  • Used by repair and overhaul facilities to align with quality and identification requirements, ensuring traceability and consistency

• Adaptation for Adjustable Propellers

  • Appendix X1 offers specific guidance when adapting requirements to in-flight adjustable propellers, broadening the standard’s application within the light sport segment

Related Standards

• ASTM F2339: Practice for Design and Manufacture of Reciprocating Spark Ignition Engines for Light Sport Aircraft
• Additional ASTM standards covering landing gear, flight control systems, and aircraft materials may be relevant depending on the aircraft system context

ASTM F2506-22 is internationally recognized and harmonized with principles set forth by the WTO Technical Barriers to Trade (TBT) Committee, providing manufacturers and stakeholders with a reliable reference for light sport aircraft propeller standards.

Keywords: ASTM F2506-22, light sport aircraft, aircraft propellers, propeller design, endurance testing, propeller standards, quality assurance, aviation safety, ground adjustable propeller, fixed-pitch propeller, in-flight adjustable propeller

Standards Content (Sample)

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:F2506 −22
Standard Specification for
Design and Testing of Light Sport Aircraft Propellers
This standard is issued under the fixed designation F2506; 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 3. Terminology
1.1 This specification covers the establishment of the mini- 3.1 Definitions:
mum requirements for the design, testing, and quality assur- 3.1.1 blade, n—the aerodynamic portion of a propeller
ance of fixed-pitch or ground adjustable propellers for light which is rotated through and acts on the air.
sport aircraft. These propellers are used on light aircraft, and
3.1.2 blade root, n—the portion of the blade that interfaces
could be used with engines conforming to Practice F2339.
with the hub and provides retention.
1.1.1 When applying the additions provided in Appendix
3.1.3 conventional fixed pitch propeller, n—a one-piece
X1, this specification also covers the establishment of the
fixed pitch propeller that is constructed of material such as
minimum requirements for the design, testing and quality
woodormetalthathasnoabruptchangesinmaterialproperties
assurance of in-flight adjustable propellers for light-sport
as the blades transition through the hub area.
aircraft.
3.1.3.1 Discussion—A propeller with wooden blades
1.2 This specification is intended for use by manufacturers
bonded to a metallic hub would not be conventional.
of propellers for light sport aircraft.
3.1.4 fixed pitch propeller, n—a propeller with no capacity
1.3 This specification does not address the airframe instal-
for pitch setting adjustment.
lation requirements for propellers.
3.1.5 ground adjustable propeller, n—a propeller whose
1.4 This standard does not purport to address all of the
pitch setting is adjustable only when the aircraft is on the
safety concerns, if any, associated with its use. It is the
ground and the propeller is not rotating.
responsibility of the user of this standard to establish appro-
3.1.6 hub, n—any device that retains the blades of a propel-
priate safety, health, and environmental practices and to
ler assembly.
determine the applicability of regulatory limitations prior to
3.1.7 pitch setting, n—the propeller blade setting as deter-
use.
mined by the blade angle measured in a manner, and at a
1.5 This international standard was developed in accor-
radius, specified by the instruction manual for the propeller.
dance with internationally recognized principles on standard-
3.1.8 propeller, n—a device for propelling an aircraft that
ization established in the Decision on Principles for the
has blades on an engine-driven shaft and that, when rotated,
Development of International Standards, Guides and Recom-
produces by its action on the air, a thrust approximately
mendations issued by the World Trade Organization Technical
perpendicular to its plane of rotation.
Barriers to Trade (TBT) Committee.
2. Referenced Documents 4. General
2.1 ASTM Standard: 4.1 Eachmanufacturerwhoclaimscompliancetothisspeci-
F2339 Practice for Design and Manufacture of Reciprocat- fication must be able to show compliance with the applicable
ing Spark Ignition Engines for Light Sport Aircraft requirements of this specification.
4.2 Manufacturers must prepare and make available a list of
acceptable engine-propeller combinations.
This specification is under the jurisdiction of ASTM Committee F37 on Light
Sport Aircraft and is the direct responsibility of Subcommittee F37.70 on Cross 4.3 Manufacturers must prepare and make available an
Cutting.
operating manual or manuals containing, at minimum, the
Current edition approved Oct. 1, 2022. Published November 2022. Originally
following information:
approved in 2007. Last previous edition approved in 2013 as F2506 – 13, which was
4.3.1 Anoveralldescriptionofthepropelleranditsfeatures.
withdrawn in January 2022 and reinstated in October 2022. DOI: 10.1520/F2506-
22.
4.3.2 The mass moment of inertia of the propeller about its
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
rotational axis.
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
4.3.3 Instructions for installation of the propeller.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 4.3.4 Instructions for operation of the propeller.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F2506−22
4.3.5 The maximum allowable engine power and rotational not exceed values shown to be safe for continuous operation in
speed and any other propeller operating limitations found accordancewiththeapplicablerequirementsofSection6,Tests
necessary by the manufacturer for the safe operation of the and Inspections.
propeller.
6. Tests and Inspections
4.3.6 Forgroundadjustablepropellers,instructionsforpitch
adjustment and the minimum and maximum pitch settings 6.1 General:
allowed during operation.
6.1.1 Each manufacturer must be able to show that the
4.3.7 Instructions for removal of the propeller. propeller concerned can complete the applicable tests and
inspections of this section without evidence of failure or
4.4 Each manufacturer must prepare and make available a
malfunction.
maintenance manual. The maintenance manual is intended to
6.1.2 The minimum applicable testing and inspection re-
provide for continued safe and proper operation of the propel-
quirements are outlined in Table 1 according to propeller
ler throughout its life cycle and contains, at minimum, the
material type.
following content:
4.4.1 A maintenance schedule that provides the recom- 6.2 Strength Testing:
mended periods at which the propeller should be cleaned, 6.2.1 Proof of strength must be shown for all propellers
adjusted, inspected, and tested.
except conventional fixed pitch propellers.
4.4.2 The applicable damage and wear allowances. 6.2.2 On all other propellers, the blade root and blade
4.4.3 Any applicable maintenance and overhaul
retention system must be tested for1hata load level equal to
instructions, which include the following: two times the centrifugal load that would be generated by the
4.4.3.1 A list of tools needed.
blade weight at maximum rated rotational speed. This may be
4.4.3.2 Skills or training required for personnel performing donebyeitherawhirltestorastaticpulltest.Therequiredpull
the work.
load for each blade must be carried by at least the inner 20 %
4.4.3.3 Inspections required. of its span.
4.4.3.4 Details of repair and overhaul sequence and meth-
6.3 Stress Measurement, Fatigue Strength, and Fatigue
ods.
Analysis—Vibration testing may be performed to allow re-
4.4.3.5 Applicable testing requirements.
duced endurance test hours. This section does not apply to
4.4.4 If a manufacturer deems it necessary to set mandatory
conventional fixed pitch wooden propellers.
replacement intervals of propellers or propeller components,
6.3.1 The magnitude of the propeller vibration stresses,
the details of this requirement shall be stated in a separate,
including any stress peaks and resonant conditions, throughout
clearly distinguishable section entitled Life Limitations.
the operational envelope of the propeller shall be determined:
6.3.1.1 By direct measurement of stresses on a vibrationally
5. Design and Construction
representative engine, or
5.1 Design Features—The propeller may not have design
6.3.1.2 Comparison of the propeller to similar propellers
features that have been shown to be hazardous or unreliable
installed on similar airplane installations for which these
unless the suitability of each questionable design detail or part
measurements have been made.
can be established by tests.
6.3.2 Through testing or analysis, the fatigue allowable for
root, mid-blade and tip regions of the propeller blade shall be
5.2 Materials—The suitability and durability of materials
determined. This testing shall also account for normal in-
used in the propeller must:
service damage and wear.
5.2.1 be established on the basis of in-service experience or
6.3.3 Using the measured stresses and root, mid-blade, and
tests; and
tip fatigue allowables, a fatigue assessment shall be conducted
5.2.2 conform to documented specifications that ensure that
to show that failure of the propeller will not occur between the
strength and other material properties consistently meet or
exceed those used in the initial design and qualification testing. declared propeller inspection intervals when using the declared
inspection techniques.
5.3 Durability—Each part of the propeller must be designed
and constructed with consideration of likely in-service damage 6.4 Endurance Testing—The propeller shall undergo an
endurance test on the intended engine or a vibrationally
and wear. The propeller must be able to operate normally
between inspection and overhaul periods at the maximum representative engine that is capable of providing the maxi-
mum rated power at the maximum rated propeller rotational
damage and wear limits published in the maintenance manual.
speed and diameter. The propeller pitch may be adjusted as
5.4 Ground-Adjustable Propellers—The adjustment system
of a ground-adjustable propeller must be designed such that no
TABLE 1 Applicable Section 6 Paragraphs for Testing and
single failure or malfunction in that system during normal or
Inspection Requirements
emergency operation will result in unacc
...