SAE ARP1279
SAE ARP1279 1972-AUG-01 Standard ndoor Method of Collecton and Presentaton of the Bare Turboshaft Engne Nose Data for Use n Helcopter nstallatons
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This Aerospace Recommended Practice (ARP) outlines a recommended test procedure, data collection and preparation method for indoor noise tests of a bare turboshaft engine suitable for helicopter installations. It should be recognized that free field measurements are preferable.