What does a red fire warning light indicate?

• A. It illuminates when smoke is detected and should stop once the smoke is cleared.
• B. Battery low in smoke detector.
• C. Engine fire.
• D. Overheating oven.

Answer: (A)

Red fire warning lights signal that smoke has been detected by the fire detection system. When the detectors sense smoke, the light comes on to alert the crew and trigger the appropriate fire-fighting procedures. The light should go off once the smoke is cleared or the fire is addressed and the system resets, confirming that the immediate danger has been managed. This cue is distinct from other indicators: a battery‑low warning in a smoke detector is typically amber, and a fire warning for a specific engine or an unrelated overheating issue would use different indicators tied to those systems. So the red light directly points to the presence of smoke and clears only after the smoke is gone.