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ASTM D6424-25

Standard Practice for Octane Rating Naturally Aspirated Spark Ignition Aircraft Engines
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1.1 This practice covers ground based octane rating procedures for naturally aspirated spark ignition aircraft engines using primary reference fuels.

1.2 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.

1.3 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.

5.1 This practice is used as a basis for determining the minimum motor octane requirement of naturally aspirated aircraft engines by use of PRFs.

5.2 Results from standardized octane ratings will play an important role in defining the actual octane requirement of a given aircraft engine, which can be applied in an effort to determine a fleet requirement.

SDO ASTM: ASTM International
Document Number D6424
Publication Date Oct. 1, 2025
Language en - English
Page Count 11
Revision Level 25
Supercedes
Committee D02.J0.02
Publish Date Document Id Type View
Oct. 1, 2025 D6424-25 Revision
May 1, 2019 D6424-04AR19 Revision
Dec. 15, 2014 D6424-04AR14 Revision
July 1, 2010 D6424-04AR10 Revision
Nov. 1, 2004 D6424-04A Revision
June 1, 2004 D6424-04 Revision
Dec. 1, 2003 D6424-03 Revision
June 10, 1999 D6424-99 Revision