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While turning by reference to instruments, the rate of turn shown on a standard rate turn indicator ("2-minute turn") is

Choices

180° per minute.
180°/min is correct in degrees, but the answer needs to express it as 3°/sec for a 2-minute completion.
360° per minute.
That would be 6°/sec — half-standard rate turn, not standard.
✓ 3° per second (180° per minute).correct
completing a 360° turn in 2 minutes. A standard rate turn is 3°/sec. Over 2 minutes that is 360° — hence the term "2-minute turn." The bank angle to achieve a standard rate scales with airspeed (rule of thumb: bank ≈ TAS/10 + 7).
6° per second.
6°/sec is twice the standard rate.

Why

completing a 360° turn in 2 minutes. A standard rate turn is 3°/sec. Over 2 minutes that is 360° — hence the term "2-minute turn." The bank angle to achieve a standard rate scales with airspeed (rule of thumb: bank ≈ TAS/10 + 7).

FAA source: PHAK Ch 8, AIM 5-3-5; PHAK Chapter 8 — Flight Instrumentsbrowse the reference library →

Covered in Supplemental · VIII — Basic Instrument 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.