1. TURBINE ENGINE REMOVAL AND OVERHAUL

2. Checking Turbine Blade Tip-to-Shroud Clearance

3. Blending (not margaritas)

4. Defect /Repair Terminology
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

5. Checking A Nozzle Vane for Bowing
But not Boeing, they manufacture aircraft not engines!

6. Defect /Repair Terminology Continued
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

7. Compressor Blade Defects

8. Defect /Repair Terminology Continued
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

9. Typical Repair Limits

10. Defect /Repair Terminology Continued
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