to the disk 18 which in turn is coupled to the engine shaft not shown for rotary motion ahead of and in back of the turbine blade 16 are the stator vane assemblies 20 and 22 respectively and each stator vane assembly includes a plurality of circumferentially spaced vanes 24 and 26 only one being shown that serve to direct the engine working medium into adjacent turbine blades these components are well known and for more details thereof reference should be made to u s pat no 6 393 331 granted to chetta et al on may 21 2002 and u s pat no 5 839 878 granted to maier on nov 24 1998 suffice it to say that this invention is particularly concerned with static structures in the engine where it is desirable to provide a component that is characterized as being capable of withstanding the high temperatures and hostile environment while affording the advantages being described herein in the boas the outer air seal main body is made from a high temperature porous material like a foam metal such as that manufactured by porvair advanced materials 700 shepherd street hendersonville n c 26792 usa that could be made from hastalloy inconel fecraly and the like the material selected must be capable of being reduced to a powder so that.