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Cash nailed it. Everything with airplanes is serialized, which is to say the the SN of component 123XYZ was installed on airplane SN 123. So it is exactly known the SN of each major component installed on EVERY airplane built. This goes all the way down to single engine part 23 piston airplanes. But worth noting - you have to retrieve that part from the bottom of the ocean to verify the SN.
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