ASTM D6812 tandard Practice for Ground-Based Octane Rating Procedures for Turbocharged/Supercharged Spark Ignition Aircraft Engines
11. Report
11.1 Attach a description of the history of the aircraft engine to the results.
11.1.1 As a minimum, include information regarding whether or not the engine was recently remanufactured, overhauled, or new. Also include the number of hours since the last overhaul.
11.1.2 Include the type of wastegate controller employed.
11.2 Attach data recorded from the instrumentation listed in 6.1, recorded at a minimum rate of 1 sample of all parameters for every 10 s of engine testing, to the results.
11.3 Report the results from the cylinder compression checks. Report the data in terms of measured cylinder pressure when the applied pressure is equal to 552 kPa (80 psi).
11.4 Annex A1 details the referee method for knock detection and the quantification of the combustion condition. If that method is utilized, the results shall include a description of the points tested, the octane number of the PRF or RF tested, the number of consecutive engine cycles collected, the maximum knock number over those cycles, and the number of those cycles that experienced a knock condition.
11.5 If utilizing a system other than the one described in Annex A1, provide a detailed description of that system.
11.5.1 Report the sample rate and length of sampling.
11.5.2 Report the number of knock events over the given sample period for each cylinder.
11.6 Report engine data, as listed in Section 6, for each engine power setting configuration tested. Report the data for the time during which the knock data was being collected. It may be advantageous to report averaged values over that same period.
11.6.1 Report both the observed engine power and the engine power corrected for standard day barometer. Report a description of the correction method used and the barometer.
11.6.2 Report the observed brake specific fuel consumption. Report the corrected specific fuel consumption using the corrected power values from 11.6.1.
11.7 Attach detailed descriptions of any engine difficulties or problems to the engine and knock data, including the time the problem occurred, the test fuels used, and any subsequent findings.
12. Keywords
12.1 aircraft engine; octane rating; octane requirement; spark ignition aircraft engine; turbocharged/supercharged
