ESDU 91020 presents data on the variability of civil aircraft and engine performance quantities drawn from a report of the ICAO Standing Committee on Performance@ and also more recent information on the variability of turbo-fan engine performance quantities. These latter data are given as ranges of uncertainty and are converted to the ICAO form of a standard deviation using information from ESDU 91017. The variability data are then used to calculate the variability of take-off climb gradient; the methods of ESDU 91017 are again used@ this time to calculate the overall variability arising from the cumulative effects of the individual variabilities in drag@ thrust and weight.
91020-1991由ESDU - Engineering Sciences Data Unit 发布于 1991-10-01,并于 2004-05-14 实施。
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