Technical Case Study: Engineering Solutions for Gas Turbine Components

Overview

As a Product Support Engineer and later as Customer Support Center Engineering Manager, I evaluated and resolved complex non-conformances in turbine engine components. My work required technical analysis, mechanical engineering principles, statistical evaluation, process redesign, and collaboration with OEMs and cross-functional teams.

The goal was to ensure safe, compliant, and high-quality repairs, while improving operational efficiency and supporting development and approval of new repair methodologies, contributing to product delivery and repair execution.

Key Projects

1. Low Pressure Turbine Case Rail – Wear Limits and Repair Development

Challenge:

Repetitive wear on the nozzle support was not defined in existing repair guidance. Without defined limits, decisions on repair or scrap were inconsistent, impacting production flow and component yield.

Approach:

• Researched similar product lines for geometric, material, and functional equivalence.
• Analyzed the typical condition, structural integrity, stiffness, and assembly impact to support a limit proposal.
• Presented analysis to customer and design authority representatives for review.

Outcome:

• Supported development and approval of revised service limits and repair methodology for nozzle support rail wear.
• Reduced non-conformance for the customer by ~20%, improving component yield and supporting operational efficiency.

2. Low Pressure Turbine Drive Shaft – Internal Mating Diameter Issue

Challenge:

Incidental material removal during repair posed potential risks.

Approach:

• Researched similar defects that were allowed as serviceable in the area.
• Analyzed stress caused by the allowed defect and compared to the geometry created by the incidental material removal.
• Provided technical analysis supporting approval of the repair condition.

Outcome:

• Supported development of a more robust substantiation package used in the approval cycle.
• Allowed safe repair of the defect and return to service.

3. High Pressure Compressor Case – Sealing Ring Mating Surface Issue

Challenge:

Incidental material removal during repair posed potential safety risks, freezing the component line until resolved.

Approach:

• Conducted dimensional and visual inspections of affected components.
• Reviewed condition against work records and identified three process failure points.
• Used statistical analysis (t-distribution) to support validation of previously processed components and assess risk.
• Collaborated with OEM design engineers for failure analysis.
• Led cross-functional efforts to redesign repair processes with CNC machining, controlled masking, and improved deburring procedures.

Outcome:

• Salvaged 75% of affected components, avoiding unnecessary scrap.
• Supported validation of all cases in use, preventing downtime situations and customer cost.
• Implemented new processes that resulted in 0 uncontrolled process findings across hundreds of subsequent repairs.

4. Low Pressure Turbine Case – Thermal Spray Flange Thickness Issue

Challenge:

Thermal spray repairs caused inconsistent flange thickness, potentially affecting assembly and performance.

Approach:

• Identified correlation between thickness variation and prior welding-induced distortion.
• Reviewed specifications tolerances for thickness and GD&T requirements and applied calculations to guide controlled material removal, ensuring compliance with repair direction and eliminating downstream issues.

Outcome:

• Eliminated the thickness issue in total. Saved lost TAT (multiple days) on 33% of cases.
• Achieved consistent repair results, reducing rework and improving operational efficiency.

5. Low Pressure Turbine Case – Specialized Welding Process

Challenge:

A unique case was received with a hole in the containment wall that required evaluation of a unique one-off repair utilizing specialized welding.

Approach:

• Supported definition of material removal and machining requirements.
• Coordinated with the welding process engineer to refine experimental parameters for successful welds and procured samples for parameter testing.
• Supported development of operator work instructions to perform the repair reliably.
• Contributed technical data supporting source substantiation and design authority approval, which included lab samples and testing.

Outcome:

• Supported successful implementation of a complex weld repair process with OEM approval.
• Ensured repeatable, safe, and compliant application, validating the process through experimental testing and parameter adjustments.

6. Non-Conformance Management - Process Monitoring and Evaluation

Challenge:

Repetitive damage patterns caused inefficiencies in non-conformance evaluation and delayed repair TAT.

Approach:

• Designed and implemented a statistical process monitoring system to categorize damage by feature, severity, and frequency.
• Guided the team in analyzing mechanical causes and prioritizing inspection and repair efforts.
• Used data to collaborate with engineers and support development of repair solutions for review by customer and certification stakeholders.

Outcome:

• Supported development and approval of multiple repair methods, including one blend repair affecting 20% of cases for a high-volume product line.
• Streamlined inspection and repair evaluation processes, improving data-driven decisions and operational efficiency.

Summary

• Technical Expertise: Applied mechanical engineering principles, stress/strength evaluation, and geometric analysis to complex turbine components.
• Process Improvement: Redesigned repair workflows and processes to improve quality, efficiency, and compliance.
• Measurable Impact: Reduced scrap, mitigated operational risk, and improved turnaround time.
• Collaboration: Worked closely with OEM engineers, cross-functional teams, and operators to ensure safe, practical, and timely solutions.

Details are intentionally generalized to protect proprietary, customer, and export-controlled information.