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.
Air which is forced to enter a moving aperture, such as the air intake of an aircraft. Example sentences âA modified cowling was needed along with a large intake under the fuselage to supply ram air but the project was not completely successful due to developmental problems and both companies dropped the experiment.â âThe aircraft still was getting ram air over the cooling fins, but most of the efficiency of the exchanger had been lost.â âA stock 5.3 litre Jaguar V12 was used, with the only changes being ram air intakes.â