SESK: Stuff Everyone Should Know · sesk.info/ifr-clearance-and-plan
Which two things must you have before operating IFR in controlled airspace?
A filed IFR flight plan and an ATC clearance.
- An IFR flight plan and an instrument-rated passenger
- A filed IFR flight plan and an appropriate ATC clearance ✔
- An ATC clearance and a filed alternate
Why: 91.173 says no one may operate in controlled airspace under IFR without a filed IFR flight plan and an appropriate ATC clearance. This is the basic ticket for IFR flight.
Huh, didn't know that: The rule covers controlled airspace, so 91.173 itself does not require a clearance for IFR flight in Class G airspace.
Center: "Do you require an IFR clearance? We're showing below VFR minimums in your area." Cherokee: "Nah. We'll be ok once we get outa these clouds."
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References
Answer: A filed IFR flight plan and an appropriate ATC clearance. 91.173 says no one may operate in controlled airspace under IFR without a filed IFR flight plan and an appropriate ATC clearance. This is the basic ticket for IFR flight.
- 14 CFR 91.173 ATC clearance and flight plan required www.law.cornell.edu/cfr/text/14/91.173
No person may operate an aircraft in controlled airspace under IFR unless that person has
Checked 2026-10-10. - 14 CFR 91.169 IFR flight plan: information required www.law.cornell.edu/cfr/text/14/91.169
Except as provided in paragraph (b) of this section, an alternate airport.
Checked 2026-10-10.
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