The Ageing Management Plans of nabla will address in detail, component per component, the fatigue accumulation to reach the life extension target. This AMP comes as a result of:

• the results of the Practical Assessment and Inspections
• the results of Life Expectancy of the component
• expected failure rate and associated Costs in the Reliability Model
• Maintenance FMECA

AMPs consists of several tasks:

• FEM - Finite Element Modeling
• FEA - Finite Element Analysis
• Damage Tolerance Analysis:
  • Critical crack length (both elastic and plastic checks)
  • Crack Propagation Pattern
  • Leading to the build-up of the risk evaluation criteria for cracks, determining, given a certain crack and its length, how this crack will propagate and when will it become critical
• Adaptation of Maintenance Protocols:
  • Specific inspections and test to be done
  • Inspections Frequency
• Detail definition of the reinforcements