When should I contact Center

If I am on no prior frequency, so departing from an airport under unicom, should I contact Center once through 18000 feet (as in entering the FIR) or as soon as I have taken off and left the airport’s airspace?

If there is no departure frequency in the vicinity or covering your departure airport contact them since you are in their jurisdiction. Centers airspace extends from surface to FL600 when approach or departure isn’t active if I recall correctly. This is why they have the ability to clear aircraft for an ILS approach for example when approach is not active.

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Thanks for the info

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