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This Aerospace Recommended Practice (ARP) standardizes test equipment and procedures for the measurement of smoke emission from aircraft gas turbine engines. The procedures included are for determining and reporting the amount of smoke emission. Tests have indicated that the practically achieveable precision of the smoke number is within ±3 when the system is properly used as outlined herein. This procedure is not intended for in-flight testing, nor does it apply to afterburning engines. This ARP is divided into the following sections: 2 Definitions and Terminology 3 Equipment 4 Test Procedures 5 Information and Data to be Recorded 6 Data Reduction and Analysis 7 Presentation of Results 8 Comments