Which of the following is NOT one of the three common scanning methods?

• A. Circle
• B. Radial
• C. Inverted V
• D. Rectangle

Answer: (A)

In instrument flying, you cross-check the aircraft’s gauges using a systematic scanning pattern so you don’t miss changes in any instrument. The three patterns most commonly taught are rectangular, inverted-V, and radial. Each one provides a repeatable path that keeps your eyes moving through all the primary indicators in a predictable order, helping you spot deviations quickly and maintain situational awareness.

A circular sweep isn’t part of the standard set because it doesn’t give you a defined sequence to cover every instrument efficiently. With a circle, it’s easy to skip something or lose track of where you left off, especially when you need to detect small, rapid changes. The rectangular, inverted-V, and radial patterns are designed to ensure you observe all critical instruments in a consistent, thorough way.