What is the purpose of the turn coordinator?

• A. To measure air pressure
• B. To indicate the rate of turn and whether the aircraft is in coordinated flight
• C. To display engine temperature
• D. To monitor fuel consumption

Answer: (B)

The turn coordinator serves a crucial function in aircraft instrumentation by indicating both the rate of turn and the coordination of the aircraft during flight. It helps pilots maintain the correct bank angle necessary for effective maneuvering. This instrument typically displays a miniature airplane symbol that shows if the aircraft is in a coordinated turn—meaning the aircraft's angle of bank is appropriate to the turn rate, thus preventing skidding or slipping. When the turn coordinator shows a steady rate of turn, it indicates that the pilot is executing the turn effectively without excess lateral motion, which is particularly important in maintaining control during various maneuvers.

The other choices do not relate to the function of the turn coordinator. Measuring air pressure, displaying engine temperature, or monitoring fuel consumption falls under other specialized instruments within the cockpit that serve different purposes and do not involve turning or maneuvering dynamics.