FAA Aircraft Dispatcher (ADX)Navigation and ATCMedium
An aircraft's final approach speed (Vref) is 132 knots. For the purpose of determining circling approach minimums, which approach category applies?
- ACategory B
- BCategory D
- CCategory C
- DCategory A
Show answer & explanationAnswer & explanation
Correct answer: C. Category C
Approach categories are based on 1.3 times stall speed in landing configuration at maximum certificated landing weight (approximated by Vref). Category C covers 121–140 knots, Category B covers 91–120 knots, and Category D covers 141–165 knots. A Vref of 132 knots falls within the Category C range.
Why the other options are wrong
- A. Category B tops out at 120 knots, below the given speed.
- B. Category D begins at 141 knots, faster than 132.
- D. Category A is for speeds below 91 knots, far slower than 132.
Approach Categories
Aircraft are grouped into categories A–E based on approach speed (1.3 Vso) to determine circling and straight-in approach minimums.
- Category A: <91 kts
- Category B: 91-120 kts
- Category C: 121-140 kts
- Category D: 141-165 kts
- Category E: 166+ kts
Memory trick: 'A-B-C-D-E: Add 30 knots each letter, roughly.'