Aircraft Approach Category (Cat A-E)

The aircraft approach category is a deceptively simple idea that governs which minima a crew is legally entitled to use on an instrument approach. Both the ICAO framework in Doc 8168 (PANS-OPS) and the FAA framework (14 CFR 97.3 and the Aeronautical Information Manual) group aircraft into five categories based on a single speed: the reference landing speed, usually written Vat. Vat is defined as 1.3 times the stalling speed in the landing configuration (Vso) at the maximum certificated landing weight. Because faster aircraft need more airspace to maneuver — wider turn radii on a circling approach, longer distances to descend and align — the obstacle-clearance areas and the visibility and altitude minima on an approach chart are built around these speed bands.

The five categories are defined by Vat as follows: Category A covers aircraft with a Vat below 91 knots; Category B covers 91 knots up to but not including 121 knots (commonly stated as 91-120 kt); Category C covers 121 knots up to but not including 141 knots (121-140 kt); Category D covers 141 knots up to but not including 166 knots (141-165 kt); and Category E covers 166 knots and above. On an instrument approach chart the minima are tabulated in columns by category, and a circling approach in particular expands its obstacle-protected radius as the category increases, which is why the circling minima climb steeply from Cat A through Cat D.

Most training aircraft — the typical single-engine and light twin trainers a flight school operates — fall into Category A or B, because their landing-configuration stall speeds are low enough that 1.3 Vso stays under 121 knots. Turboprop commuters and business jets typically fall into Category C, and larger transport jets into Category D. Category E is reserved for the highest-Vat aircraft and is rarely encountered outside specific military or heavy types.

The category is determined by the aircraft's certificated performance, not by how the pilot chooses to fly on a given day, and this is where an important operating rule applies. A pilot must use the minima for the category that corresponds to the speed actually being flown if that speed exceeds the range for the aircraft's normal category. In practice this most often arises on a circling approach flown faster than the category's upper limit — for example, carrying extra speed for gust or configuration reasons. If the circling speed exceeds the aircraft's category band, the crew must apply the higher minima of the category into which that speed falls. What a pilot may not do is fly at a higher speed while using the lower, more permissive minima of a slower category, because the obstacle-clearance area that protects the approach was sized for the slower speed. The category is a floor on the airspace the maneuver needs, so flying faster demands the more conservative numbers.

For instrument-training providers, teaching approach categories correctly is a safety issue disguised as a chart-reading detail. A student who reads the wrong column of minima — or who does not understand that speeding up on a circling approach can require a higher minimum — is being set up for a real obstacle-clearance hazard, not just a checkride discrepancy. Because nearly all training aircraft sit in Cat A or B, students naturally default to those columns, which makes it all the more important to teach explicitly why the higher columns exist and when the speed rule forces a pilot into them.

The concept also connects directly to how a school assigns aircraft and plans instrument lessons. Knowing each aircraft's approach category, and holding the correct approach charts and briefing material for it, is part of preparing an instrument sortie properly. For schools that operate a mixed fleet — light singles alongside faster twins or turboprops — the category is one of the parameters that determines which minima, which procedures, and which briefings are appropriate for a given aircraft on a given approach.

Aviatize's Training Management and Ground Training & Checking modules let a school document that instrument students have been taught and assessed on approach-category selection, circling minima, and the speed rule as part of the instrument syllabus, so the competency is recorded rather than assumed. Progress and checking records tie the theory to demonstrated performance on flights and in the simulator.

By keeping fleet and lesson data together, the platform supports assigning the right aircraft to an instrument lesson and ensuring the associated procedures and briefing material match that aircraft's category, so instructors plan sorties from accurate, current information.