What should be tested in a visual smoke detector for operational assurance?

In a visual smoke detector, testing the airflow through the indicator is crucial for operational assurance. This is because smoke detectors, particularly those designed to sense particle concentrations in the air, rely on proper airflow to function effectively. If the airflow is obstructed or insufficient, the detector may not be able to detect smoke particles accurately, leading to potential safety hazards. Ensuring that the detector has the proper airflow helps confirm that it can respond appropriately in the event of a fire, thus maintaining safety standards in aviation operations.

Other aspects, such as the range of alarm sound, position of the smoke detector, and color of the indicator lamp, may contribute to the overall functionality and user interface of the smoke detection system, but they do not directly influence the detector's primary function of sensing smoke. These features should also be checked during routine maintenance, but assessing airflow is paramount for ensuring that the smoke detection mechanism is responsive and reliable in real conditions.