Platelike projecting component portion of a gas turbine

This application claims priority under 35 U.S.C. §119 and/or 365 to Appln. No. 100 16 081.6 filed in Germany on Mar. 31, 2001; the entire content of which is hereby incorporated by reference. A platelike projecting component portion of a component used in gas turbines or other similar applications includes a surface upon which hot gas acts and cooling bores through which a cooling medium is capable of flowing. Effective cooling is achieved by providing at least one plenum assigned solely to the component portion. The plenum is arranged so as to be directly adjacent to the surface upon which hot gas acts and through which the cooling medium is capable of flowing to provide convective heat transfer. The cooling bores are designed as blow-out orifices which emanate from the plenum and issue the cooling medium onto the surface upon which hot gas acts, thereby forming a cooling film.