Which statement describes the indicator for lavatory smoke detectors when smoke is detected?

Which statement describes the indicator for lavatory smoke detectors when smoke is detected?

• A. The green power indicator lights
• B. The blue fault indicator lights
• C. The red alarm indicator lights
• D. No indicator lights

Answer: (C)

When smoke is detected, the lavatory detector uses a red alarm indicator light to show that an alarm condition is active. This red light provides an immediate, clear cue to crew that smoke has been detected and action is required. Green indicators simply show the unit has power, not the detection state, while blue indicators flag a fault or malfunction. So the red alarm lights correctly communicate that the system has detected smoke and is in alarm.

When smoke is detected, the lavatory detector uses a red alarm indicator light to show that an alarm condition is active. This red light provides an immediate, clear cue to crew that smoke has been detected and action is required. Green indicators simply show the unit has power, not the detection state, while blue indicators flag a fault or malfunction. So the red alarm lights correctly communicate that the system has detected smoke and is in alarm.