Abstract
This is a report of BAC progress in the development of jet engine in-flight noise suppressors. The importance of model testing, full-scale ground testing and flight testing is emphasized. A relatively economical flight test method is presented which allows accurate flight noise data to be predicted without resort to take-off maneuvers at specific gross weights. The results of such flight tests have been summarized in a family of fixed altitude curves which relate over-all sound levels beneath the flight path to net thrust per engine. These curves together with Model 707-120 take-off performance data may be used to determine sound levels beneath the flight path for various take-off procedures at any gross weight.
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