What must a pilot have before operating under IFR in controlled airspace?
Answer
The pilot must have filed an IFR flight plan and received an appropriate ATC clearance.
14 CFR § 91.173
Read the full regulation — 14 CFR § 91.173
Part 91 Section 91.173 § 91.173 ATC clearance and flight plan required. No person may operate an aircraft in controlled airspace under IFR unless that person has— (a) Filed an IFR flight plan; and (b) Received an appropriate ATC clearance.
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