Also found in: Acronyms.
The best rate-of-climb speed with a single engine. It should be marked on the ASI (air-speed indicator) as a blue radial line and is often referred to as the blue-line speed. The same as YYSE. See best rate-of-climb air speed.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved