NASA and FAA Propose Computer Simulations to Cut Metal 3D Printing Certification Time and Cost

NASA and the Federal Aviation Administration (FAA) have published a landmark strategy document proposing computer simulations as a tool to cut the time and cost of certifying metal 3D printed aviation components. The 195-page report, developed over five years by a steering group known as CM4QC, sets out a detailed roadmap for weaving computational modeling into the qualification and certification process.

The Certification Problem

Despite years of investment and genuine technical progress, metal additive manufacturing has yet to make a significant dent in certified aviation hardware. The main obstacle is not the printing itself—it is what comes after.

Under current rules, every new 3D printed metal part must be validated through exhaustive physical testing. Each change in alloy, printer model, or part geometry can trigger a fresh round of testing. Generating the allowables data required to certify a single new material and process combination currently costs more than $1 million and takes upward of 18 months.

Why Simulation Matters

Certification in aviation was designed around conventional manufacturing, where materials behave predictably and uniformly. Metal 3D printing does not work that way. Because a laser melts and fuses thousands of layers of metal powder, the thermal history varies across the part, producing a microstructure that can differ from one location to the next.

The report proposes using validated computer simulations to trace the physics from the laser beam all the way to the finished component's mechanical performance—modeling how the microstructure forms, where internal stresses develop, and how the part is likely to behave under fatigue loading in service.

Simulation Maturity Framework

To make simulation results reliable enough for regulatory use, the report introduces a Simulation Maturity Level framework—a structured method for engineers and regulators to assess how much confidence to place in any given model. This covers everything from code verification and experimental validation to uncertainty quantification.

Some simulation tools are already considered mature enough for industrial use:

• Residual stress prediction
• Thermodynamic behavior modeling
• CALPHAD (computational method for modelling alloy chemistry)

Others, especially those predicting fatigue life from first principles, still need significant development.

Who's Behind It

The CM4QC steering group includes experts from:

• Boeing
• Lockheed Martin
• GE Aerospace
• Honeywell
• RTX
• Carnegie Mellon University
• Several national laboratories

What This Means

Flight certification by simulation alone is still some way off. But the industry now has a concrete, detailed plan for getting there. The framework is designed to apply to any manufacturing process where the complexity of production makes traditional test-heavy certification impractical—including friction stir welding and powder metallurgy.

This could represent the most significant development in metal AM certification since the technology emerged, potentially opening the door to much wider adoption in commercial and defense aviation.