What response is expected when ATC issues an IFR clearance to pilots?

When ATC issues an IFR clearance to pilots of airborne aircraft, pilots must respond by reading back those parts containing altitude assignments or vectors and any part requiring verification. This is mandatory.



When an Air Traffic Controller (ATC) issues an Instrument Flight Rules (IFR) clearance, the pilot is expected to provide a "full readback" of the most critical elements to ensure there were no communication errors. This is not just a polite acknowledgment; it is a legal requirement for safety. The pilot must read back the specific "clearance limit" (usually the destination airport), the assigned route (including any SIDs or airways), the initial altitude, the expected altitude (and the time/distance to expect it), the departure frequency, and the "transponder squawk code." The standard mnemonic for this is CRAFT: Clearance Limit, Route, Altitude, Frequency, and Transponder. The pilot must also include their aircraft call sign at the end of the readback. If the pilot is unsure of any part of the clearance, they must ask for a "say again" rather than guessing, as an IFR clearance is a binding contract between the pilot and the controller to maintain separation from other aircraft.

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A vector for a visual approach may be initiated if the reported ceiling at the airport of intended landing is at least 500 feet above the MVA/MIA and the visibility is 3 miles or greater. At airports without weather reporting service there must be reasonable assurance (e.g. area weather reports, PIREPs, etc.)

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There's a few things that can caused the ATC to cancel IFR: Your transponder is malfunctions, if you spawn into the flight mid-air, or on the runway, sometimes you never go through the entire IFR clearance process which makes your transponder to use the default squawk code.

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How to get an IFR clearance at a non-towered airport
  1. File a flight plan (either with Flight Service or in an aviation app).
  2. Call for your IFR clearance, including route, altitude, and transponder code.
  3. After takeoff, talk to Air Traffic Control (ATC) to transition into the en route environment.


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If you're below 18,000, feet you'll start by squawking 7600, then descend or climbing to an altitude that is acceptable for VFR cruising. You'll be expected to land as soon as practical while maintaining visual flight rules. If you're above 18,000 feet (Class A airspace) it gets a bit more complicated.

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