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4、0 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/AIR1989B AEROSPACE INFORMATION REPORT AIR1989 REV. B Issued 1989-05 Revised 1992-
5、12 Stabilized 2012-08 Superseding AIR1989A Helicopter External Noise Estimation RATIONALE This document has been determined to contain basic and stable technology which is not dynamic in nature. STABILIZED NOTICE This document has been declared “Stabilized“ by the SAE A-21 Aircraft Noise Measure and
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