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There are designated zones where Positions/FINs are allocated - so components have both Part Numbers, Serial Numbers, Positions (or FINs for Airbus) and Zone classifications.

Does zone 999 refer to being "un-zoned" or "unclassified"? Or something else perhaps? Is this only concerning Airbus this or is it universal across all manufacturers?

Excerpt from Airbus -  a330 of the Electrical Routing ATA 24-92-02-34B

Figure: Excerpt from Airbus - a330 of the Electrical Routing ATA 24-92-02-34B

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The ATA-100 specification states zones numbered in the 9xx range are "Reserved for uncommon differences between aircraft types not covered by standard series numbers."

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