Current testing requirements for high temperature alloys are defined in general industry specifications (ASTM, AMS), as well as in user specifications. Many of these requirements were established in the 1960's when production practices were yet to be refined.
cowling - protective covering consisting of a metal part that covers the engine; there are powerful engines under the hoods of new cars; the mechanic removed the cowling in order to repair the plane's engine.
Definition of cowl for English Language Learners. : 1  a loose piece of clothing with a hood that a monk wears over other clothes; also : the hood itself. : 2  a covering for a chimney that controls the way smoke flows out.