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Document Designation and Title Year Select Item(s) D6424 Standard Practice for Octane Rating Naturally Aspirated Spark Ignition Aircraft Engines 04a D6424 Standard Practice for Octane Rating Naturally Aspirated Spark Ignition Aircraft Engines 04 D6424 Standard Practice for Octane Rating Naturally Aspirated Spark Ignition Aircraft Engines 03 D6424 Standard Practice for Octane Rating Naturally Aspirated Spark Ignition Aircraft Engines 99