When is the use of a turn coordinator most beneficial during flight?

The turn coordinator is most beneficial during turns because it provides a visual indication of the rate of turn and the coordination of the aircraft during the maneuver. When an aircraft is in a turn, the turn coordinator helps the pilot maintain the correct bank angle by displaying whether the turn is coordinated, indicating if the aircraft is skidding or slipping. This information is crucial for ensuring that the turn is efficient and safe, particularly in instrument flying where visual references may be limited.

Using the turn coordinator during straight-and-level flight, climbing, or in turbulence is less applicable as the primary function of the instrument is to monitor and guide turns. While the turn coordinator can provide some information during these other phases of flight, its primary role is to assist pilots in executing turns safely and accurately.