FAA Instrument Rating Airplane (IRA)IFR Procedures and ChartsMedium
A pilot is planning an instrument approach in a Category A aircraft based on approach speed. Which factor determines the correct approach category to use for minimums?
- AThe manufacturer's certificated aircraft class (single-engine vs. multi-engine)
- BThe pilot's personal preference based on comfort level
- C1.3 times the stall speed (Vso) at maximum certificated landing weight
- DThe maximum cruise speed of the aircraft
Show answer & explanationAnswer & explanation
Correct answer: C. 1.3 times the stall speed (Vso) at maximum certificated landing weight
Approach category is based on 1.3 Vso at maximum certificated landing weight, which determines the aircraft's approach speed range and therefore the applicable minimums (Category A, B, C, D, or E) regardless of engine configuration or manufacturer class.
Why the other options are wrong
- A. Engine configuration does not determine approach category
- B. Category selection is a regulatory determination, not a personal choice
- D. Cruise speed is irrelevant to approach category determination
Approach Category
A classification (A–E) of aircraft based on 1.3 times stall speed (Vso) at maximum certificated landing weight, used to determine minimums on approach charts.
- Category A: <91 knots; B: 91-120; C: 121-140; D: 141-165; E: 166+
- Pilots may fly a higher category's minimums if circling at faster speeds
- Category determines applicable circling and straight-in minimums
Memory trick: 1.3 Vso decides your letter grade (A–E).