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TURBINE ENGINE REMOVAL AND OVERHAUL Checking Turbine Blade Tip-to-Shroud Clearance Blending (not margaritas) • Blending- A method of filing compressor or turbine blades and vanes to remove damage and reestablish the appropriate contour for an aerodynamic shape • Blistering- Raised areas that indicate a separation of a surface layer from a base metal, often evident as peeling and/or flaking of a metal plating • Bow- A stress-induced bend or curve in a blade’s or vane’s contour • Bulge- An outward bending or swelling caused by excessive pressure of weakening due to excessive heat Defect /Repair Terminology Checking A Nozzle Vane for Bowing But not Boeing, they manufacture aircraft not engines! • Compression- A squeezing force produced by two opposing forces acting on a part. • Creep(growth)- A condition of permanent elongation in rotating airfoils resulting from thermal stress and centrifugal loading. • Primary- blue, red, or yellow • Secondary- purple, orange, or green • Tertiary-aquamarine, mauve…. • Dynamic Balancing- balancing along rotational plane and the rotor axis • Electrolytic Action(galvanic corrosion)- a breakdown of surfaces caused by electrical activity between dissimilar metals Defect /Repair Terminology Continued Compressor Blade Defects • Flowing- The spreading out of a plated or painted surface caused by poor adhesion to the base or excessive loading on the part’s surface • Galling- fretting or chafing of a mating surface by sliding contact with another surface-metal is transferred from one surface to the other • Glazing- development of hard, glossy surfaces in the presence of oil, heat, and pressure • Guttering- deep concentrated erosion that results from an enlargement of cracks or repeated exposure to a concentrated flame • Profile- the contour or aerodynamic shape of a blade or surface Defect /Repair Terminology Continued Typical Repair Limits • Shear- a tearing force produced by two opposing parallel forces acting on a part • Static Balancing- a procedure that balances the main rotating assembly of a turbine engine to reduce vibration • Tension- A force that tends to pull an object apart • Untwist- a straightening and loss of blade curvature that results from gas loads, thermal stress, and centrifugal loading Defect /Repair Terminology Continued
