What observations indicate that a turn indicator is functioning correctly?

The correct answer indicates that a turn indicator is functioning correctly if there are no warning lights and no unusual noises when the instrument is powered on. This implies that the system is operational and not experiencing faults or malfunctions, which is essential for ensuring accurate flight information.

In aviation, an operational turn indicator allows pilots to monitor their aircraft's turn coordination accurately. The absence of warning lights indicates that all systems are functioning within normal parameters, while no unusual noises suggest that the mechanical or electronic parts of the indicator are working smoothly without any issues.

In contrast, other options suggest potential problems. A flashing warning light indicates a malfunction, which can affect the reliability of the indicator. Unusual noises, particularly when the engine starts, may signal mechanical issues that could impact the performance of instruments, including the turn indicator. Therefore, the correct indication of operational status is confirmed by the absence of warning signals and abnormal sounds.