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A 60° bank steep turn at 90 KIAS in a typical training airplane will cause the stall speed to

Choices

be unchanged from straight-and-level.
Bank significantly raises stall speed.
✓ increase by approximately 41%.correct
at 60° bank load factor is 2 G, and stall speed scales as √(load factor) = √2 ≈ 1.41. Stall speed in a level turn = Vs × √(load factor). At 60° bank (2 G), Vs increases by √2 ≈ 1.41×. If 1G stall is 50 KIAS, in a 60° steep turn Vs is ~71 KIAS. Cross 71 KIAS while still pulling 2G in the turn → accelerated stall. Why "steep" turns are stable practice: you must respect the elevated stall margin.
decrease.
Stall speed always increases with bank in a level turn.
double.
Doubling would require ~4G (75° bank).

Why

at 60° bank load factor is 2 G, and stall speed scales as √(load factor) = √2 ≈ 1.41. Stall speed in a level turn = Vs × √(load factor). At 60° bank (2 G), Vs increases by √2 ≈ 1.41×. If 1G stall is 50 KIAS, in a 60° steep turn Vs is ~71 KIAS. Cross 71 KIAS while still pulling 2G in the turn → accelerated stall. Why "steep" turns are stable practice: you must respect the elevated stall margin.

FAA source: PHAK Ch 5; PHAK Chapter 5 — Aerodynamics of Flightbrowse the reference library →

Covered in Supplemental · V — Performance and Ground Reference Maneuvers — study the lessons free, then practice with grading and mastery tracking.

Original study question written for this course — representative of FAA knowledge-test topics, not an actual current FAA exam question.