1. Introduction to Gas Turbines (GT) 2. Critical gas turbine components: vanes and blades 3. Materials and Coatings Technologies 4. Maintenance: Availability and Reliability 5. Typical Service Induced Damages and Repair Strategies 6. Repair Processes and Limitations 7. NDT Processes: Application and Limitations 8. Lifetime Extension: Assessment and Considerations 9. Failure Analysis 10. Systems and Technologies: Evolution and Impact 11. Bibliography