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It means a trace back to airline.

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Q: What is it mean by 129 trace in aircraft parts traceability?
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What is it mean by 129 or 145 trace?

Aircraft parts come from a variety of places. These codes are used to identified the parts origin. 145 trace indicates it came from a domestic repair station and there is paperwork to support it. 129 is a foreign carrier or operator of U.S. A/C.


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