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Sat, Nov 05, 2011

ANN's Daily Aero-Term (11.05.11): Eddy Current

Aero-Terms!

Aero-Terms are designed to be a daily reminder of the terms, names, acronyms and explanations of the unique language that populates the aviation world. Aerospace, sport aviation, fixed wing, helo, you name it... it's all fair game.

Aero-Terms should serve as a quick but intriguing reminder of the terms you may use every day, or an introduction to an aspects of the Aero-World you may not yet be familiar with. ANN also encourages readers to go beyond the FMI link, and further research any intriguing terms.

Suggestions for future Aero-Terms are ALWAYS welcome, as are additions or discussion of the explanations given for each Aero-Term.

Eddy Current

Eddy current inspection is performed by inducing eddy currents into a part and electronically monitoring variations in the induced field. The NDI technician interprets the character of the observed field change to determine the nature of the defect.

The ability of Eddy Currents to detect cracks decreases with increased thickness  of the metal being inspected. The practical limitation is approximately .090” in common aluminum aircraft skins such as clad coated, 2024 T3.

FMI: http://aviationglossary.com/aircraft-structure-term-definition/eddy-current/

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