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Flap inhibit relates to the GPWS system.
This will call 'Too Low Flaps' if flaps not in 30/40 position. Flap 15 is only ever used in non-normal situations - eng. fail, flap problems etc. Therefore, the GPWS stops you landing without landing flap in normal situations.
If the fire loops fail you continue to your destination, but I believe it would have to be fixed before any further flights.