Quick Facts
- Type
- Flight Rules
- Definition
- Regulations governing flight operations conducted primarily by reference to c...
- Used By
- Pilots, ATC
Definition#
IFR stands for Instrument Flight Rules. These regulations govern aircraft operations when the pilot navigates primarily by reference to cockpit instruments rather than visual cues outside the aircraft. IFR is required when weather conditions fall below VFR minimums (referred to as IMC — Instrument Meteorological Conditions).
Requirements#
Flying under IFR requires:
- An instrument-rated pilot (additional training and certification beyond a private pilot license)
- An IFR-equipped aircraft (certified instruments, navigation equipment, and communication radios)
- An IFR flight plan filed with and accepted by ATC
- ATC clearance before entering controlled airspace or beginning the flight
How IFR Works#
Under IFR, air traffic control provides separation services between aircraft. The pilot follows a cleared route consisting of airways, waypoints, and published instrument procedures. Key phases include:
Departure: Follow a Standard Instrument Departure (SID) or radar vectors from the tower/approach controller.
En Route: Navigate along assigned airways or direct routes, maintaining assigned altitudes, and communicating with center controllers.
IFR vs VFR#
| Aspect | IFR | VFR |
|---|---|---|
| Pilot cert | Instrument rating required | Private pilot minimum |
| Weather | Can fly in IMC | VMC required |
| Separation | ATC provides separation | Pilot see-and-avoid |
| Flight plan | Required | Recommended but not required |
| Navigation | By instruments and navaids | By visual reference |
Even on clear days, many pilots choose to fly IFR for the added structure and ATC services, especially in busy airspace or on long cross-country flights.