When an instrument approach procedure does not line you up directly with your intended landing runway — or when you simply choose to land on a different runway than the one the procedure is designed for — you need circling approach minimums. Unlike straight-in minimums, which assume you will roll out lined up with the runway and land with minimal maneuvering, circling minimums account for the fact that you must fly a visual pattern around the airport after breaking out of the clouds. That visual pattern must be flown at a safe altitude, within a protected area of airspace, and in visual meteorological conditions adequate for the task. Understanding how circling minimums work — and why the protected radius changed in 2012 — is essential for any instrument pilot preparing for the IFR knowledge test or the practical exam.
Circling minimums appear on instrument approach procedure (IAP) charts as a separate line below the straight-in minimums, labeled "CIRCLING" alongside the Minimum Descent Altitude (MDA) and the required visibility for each aircraft approach category. They are almost always higher than straight-in minimums because the protected obstacle clearance area is much larger and the geometry of maneuvering visually near the ground demands a greater buffer. Grasping the logic behind these minimums — rather than just memorizing numbers — makes you a safer and more confident IFR pilot.
Aircraft Approach Categories
Circling minimums are not one-size-fits-all; they are tied to your aircraft approach category, which is determined by 1.3 times the aircraft's stall speed in the landing configuration at maximum certified gross weight (1.3 × VSO). The FAA defines five categories:
- Category A: approach speed less than 91 knots
- Category B: 91 knots up to but not including 121 knots
- Category C: 121 knots up to but not including 141 knots
- Category D: 141 knots up to but not including 166 knots
- Category E: 166 knots or more (military aircraft primarily)
Most general aviation training aircraft — a Cessna 172, Piper Archer, or similar — fall squarely in Category A. A faster retractable like a Beechcraft Bonanza might be Category B. The category matters because faster aircraft need a larger turning radius and more airspace to maneuver safely, which is reflected in both the protected radius and the published MDAs.
One important rule: if you choose to fly an approach at a speed that places you in a higher category than your aircraft's published category, you must use the minimums for that higher category. For example, if a Category A aircraft flies the circling maneuver at 100 knots, the pilot must use Category B minimums. You may never use a lower category's minimums when actually flying at a higher speed.
How Circling Minimums Are Constructed
The MDA for a circling approach is set to ensure at least 300 feet of obstacle clearance throughout the circling area. The circling area itself is a set of overlapping circles centered on each runway threshold, with a radius that depends on aircraft category. The final approach course obstacle clearance area, the maneuvering area around the airport, and the transition areas from the final approach to the landing runway are all factored in when the approach designer sets the MDA.
Because the pilot must maintain visual contact with the runway environment throughout the circling maneuver, the published visibility minimums for circling approaches are generally higher than for straight-in approaches to the same runway. The FAA requires at least 1 statute mile visibility for circling approaches in most cases, though some procedures may publish higher values depending on obstacle environments.
The 2012 Expanded Radius Rules
Prior to 2012, the protected circling area radii were relatively small — a radius of just 1.3 nautical miles for Category A and 1.5 nautical miles for Category B, for instance. These legacy radii were established decades ago based on typical approach speeds, but as the FAA re-examined real-world maneuvering geometry and accident data, it became clear that the old circles were too tight. Pilots flying even Category A aircraft at typical circling speeds were sometimes maneuvering outside the protected area without realizing it, potentially exposing themselves to uncharted obstacles.
Effective late 2012, the FAA adopted expanded circling radii derived from a more realistic flight path model. These new radii are substantially larger than the legacy values listed above, with the exact figure for a given procedure depending on the category and, for the fastest categories, the airport's field elevation (since higher true airspeeds at altitude widen the maneuvering radius further). The expanded circling approach area construction method also changed how the protected zone itself is drawn.
Under this revised methodology, the protected area is built by drawing arcs from each runway end at the category-appropriate radius and connecting those arcs with tangent lines, rather than drawing a single circle centered on the airport reference point. The result is a more realistic, runway-oriented protected zone that better reflects how pilots actually fly the circling maneuver, and — combined with the larger radius values — provides meaningfully more protected airspace than the legacy circles.
On approach charts, when an approach uses the expanded circling area, you will see the notation "EXPANDED" or a specific "Circling NA" restriction if certain portions of the new expanded area cannot be protected due to obstacles. Some procedures may restrict circling to specific quadrants — for example, "Circling NA southeast of Runway 15-33" — meaning the pilot must not circle into that unprotected sector.
Flying the Circling Maneuver Safely
The circling maneuver begins after you reach the MDA with the runway environment in sight. You must remain at or above the circling MDA until you are in a position from which a normal descent to landing can be made. This is not merely a regulatory formality — descending below the MDA before you are properly configured for landing has caused accidents.
A recommended technique is to fly a modified traffic pattern at or slightly above the circling MDA, keeping the runway in sight at all times. If you lose visual contact with the runway environment during the circling maneuver, you must immediately execute the published missed approach procedure. This can be more complex than it sounds at night or in marginal visibility, because the missed approach point and climb gradient must be respected even when you are not in a straight-in position.
Timing and bank angle matter as well. At lower speeds (Category A), a standard-rate turn keeps the aircraft well within the protected radius. At higher speeds, standard-rate turns produce much larger turning radii, which is exactly why the category radii increase with speed. Always use a known or computed bank angle to stay inside the protected area.
Why Circling Approaches Are Higher Risk
Circling approaches account for a disproportionate share of approach-and-landing accidents in instrument conditions. The reasons are straightforward: the pilot must manage altitude, navigation, visual reference, obstacle avoidance, and aircraft configuration simultaneously during a low-altitude maneuver in potentially marginal visibility. Spatial disorientation, fixation on the runway, and failure to monitor altitude are the leading factors in circling approach accidents.
Night circling is particularly hazardous. The obstacle clearance provided by the MDA assumes the pilot is flying within the protected area; at night, black-hole illusions and the absence of visible terrain can make it difficult to judge how tightly you are maneuvering. Many IFR pilots apply a personal minimum of adding 100–200 feet above the published MDA for night circling, though any altitude flown above minimums must still be managed as a descending profile to landing once established.
Key Numbers and Rules
- Aircraft approach category is based on 1.3 × VSO at maximum certified gross weight.
- Circling approach obstacle clearance is a minimum of 300 feet throughout the circling area.
- If you fly at a speed that puts you in a higher category, you must use that higher category's minimums.
- You must remain at or above the circling MDA until in a position for a normal descent to landing.
- Loss of visual contact during circling requires an immediate missed approach.
- Some approaches restrict circling to specific runway quadrants — always check for "Circling NA" notations on the chart.
- The expanded circling area construction method (post-2012) uses runway-end-based arcs with significantly larger radii than the pre-2012 circles, rather than a single, smaller airport-centered circle.
Memory Aid
For the sequence during a circling approach, remember: "See, Maneuver, Descend" — you must See the runway environment before leaving the final approach fix area, Maneuver at or above the MDA within the protected circling area, and only Descend below the MDA when you are in a position for a normal landing. If visual contact is lost at any point, that sequence reverses into an immediate missed approach — no hesitation.
Common Test Traps
- Using the wrong category: The FAA loves to ask what minimums apply when a pilot flies faster than their aircraft's published category. Answer: always use the minimums for the category that matches your actual approach speed, not your aircraft's certification.
- Confusing MDA with DA: Circling approaches use an MDA (you level off and fly until in position to descend), not a Decision Altitude. You do not descend through the MDA the moment you see the runway — you maneuver at MDA first.
- Assuming circling is always permitted: Test questions often describe an approach with a "Circling NA" restriction and ask what the pilot may do. If circling is not authorized in a specific direction or at all, the pilot must either land on the procedure runway or execute a missed approach.
- Forgetting the missed approach point during circling: If you lose visual contact while circling, you must fly an immediate missed approach. The question may ask which way to turn — the general guidance is to turn toward the landing runway and climb to the missed approach altitude, but always follow procedure-specific guidance if published.
- Applying old radius values to new procedures: Do not assume all charts show the old construction method or the old, smaller radii. Post-2012 procedures built with the expanded area use larger protected radii and a runway-end-based construction, and chart notes will indicate applicable restrictions to that expanded area.