Define ownership, monitoring cadence, approved sources, notification periods, lifecycle data, critical items and response timing at program start. Review manufacturer discontinuance, supplier loss, raw-material shortage, software or tool dependency and calibration-support risk. Rank impact on production, repair, schedule, safety, performance and verification evidence rather than reacting only when stock reaches zero.
Compare mitigation paths such as existing stock, life-of-type buy, alternate source, redesign, emulation, repair strategy or technology refresh. A last-time buy must include demand assumptions, storage life, handling, test, counterfeit risk and ownership. An alternate part with the same package or headline gain can still change phase noise, spurs, compression, bias, thermal impedance, radiation response, EMI or control behavior.
Process every resolution through configuration control. Link the change to interfaces, budgets, drawings, BOM, software and affected verification requirements; then perform the approved analysis, inspection or test on representative hardware. Record applicability by serial or lot and update procurement and maintenance data before release.