ASTM F2339-19a PDF

Full title and description

Standard Practice for Design and Manufacture of Reciprocating Spark Ignition Engines for Light Sport Aircraft — ASTM F2339-19a. This practice provides minimum requirements and guidance for designers and manufacturers of reciprocating spark-ignition engines intended for light sport aircraft (LSA), and describes documentation and testing expectations used to support a manufacturer’s declaration of compliance.

Abstract

ASTM F2339-19a establishes design and manufacturing practices for reciprocating spark-ignition powerplants used in light sport aircraft operating under visual flight rules (VFR). It specifies units (inch–pound), points of required documentation, and the basis for a manufacturer's declaration of compliance (testing and flight/ground test evidence). The practice is concise (4 pages) and intended to be used alongside other F37 LSA consensus standards.

General information

• Status: Active (current designation F2339-19a).
• Publication date: Approved as F2339-19a in 2019 (document shown as 01/11/2019) with the active amendment/version noted through March 16, 2020.
• Publisher: ASTM International.
• ICS / categories: 49.060 (Aerospace electric equipment and systems) / Committee F37 (Light Sport Aircraft), Subcommittee F37.70.
• Edition / version: F2339-19a (includes amendments/changes noted in 2020).
• Number of pages: 4 pages.

Scope

This practice covers minimum requirements for the design and manufacture of reciprocating spark-ignition engines intended for light sport aircraft for VFR use. The values stated are in inch–pound units (to be regarded as standard). The standard does not claim to address all safety concerns; users are responsible for establishing appropriate safety, health, and regulatory practices.

Key topics and requirements

• Minimum design and manufacturing criteria specific to reciprocating spark-ignition engines for LSA.
• Declaration of compliance is based on testing and documented design/flight testing performed by or under the direction of the manufacturer.
• Units: Inch–pound units are normative for this practice.
• Concise, cross-referenced guidance intended to be used with other Committee F37 LSA standards (design, performance, QA, and continued operational safety).
• Expectation that manufacturers provide supporting documentation (test reports, flight test data, and declarations) to show compliance with the practice.

Typical use and users

Primary users are engine designers and manufacturers for light sport aircraft, LSA airframe OEMs integrating spark-ignition engines, compliance and certification engineers preparing Statements of Compliance, quality assurance personnel, and regulatory authorities or designees reviewing declarations. The practice is used during design, production, and pre-certification testing to document conformity to LSA engine expectations.

Related standards

ASTM F2339-19a is part of the F37 family of LSA consensus standards and is commonly used alongside other F37 standards such as F2245 (Design and Performance of a Light Sport Airplane) and F2316 (Airframe Emergency Parachutes for Light Sport Aircraft). Users should consult related F37 standards for airframe, performance, quality assurance, and continued operational safety requirements when applying F2339.

Keywords

light sport aircraft; reciprocating spark-ignition engine; LSA engines; design practice; manufacture; declaration of compliance; VFR; inch–pound units; ASTM F2339-19a.

FAQ

Q: What is this standard?

A: ASTM F2339-19a is a concise ASTM practice that provides minimum design and manufacturing guidance for reciprocating spark-ignition engines intended for use in light sport aircraft.

Q: What does it cover?

A: It covers minimum design/manufacture requirements, the unit system (inch–pound), and the expectation that a manufacturer's declaration of compliance be supported by testing and documentation (including design and flight testing where applicable). It is intended for VFR LSA applications.

Q: Who typically uses it?

A: Engine designers and manufacturers, LSA airframe integrators, compliance officers who prepare Statements of Compliance, QA staff, and regulatory reviewers or designees involved in LSA acceptance.

Q: Is it current or superseded?

A: The F2339-19a designation is the active/current practice (2019 edition, with the version activity recorded into 2020). Users should confirm any subsequent revisions or work items from ASTM Committee F37 before relying on the practice for new certification efforts.

Q: Is it part of a series?

A: Yes — it is part of the ASTM F37 light sport aircraft family of consensus standards (F37.x), and is intended to be applied together with other F37 standards covering aircraft design, performance, QA, and COS.

Q: What are the key keywords?

A: light sport aircraft; reciprocating spark-ignition engine; manufacturer declaration of compliance; inch–pound units; VFR; ASTM F2339-19a.