Which combination of indicators signals smoke in the lavatory when observed at 1L?

• A. Amber ACP light, amber Master Call at 1L, chimes, red smoke detector light
• B. Green indicator lights with no chimes
• C. Blue lavatory indicator only
• D. No indicators present

Answer: (A)

Smoke in the lavatory triggers a distinct alert pattern at the 1L cabin crew station. The lavatory’s smoke detector lights red to show detection, and the system also emits an audible chime. In addition, amber Master Call at 1L and amber ACP light illuminate to indicate a call from that lavatory. Seeing red light, chimes, and both amber indicators together is the clear signal that smoke is present in the lavatory. Other patterns don’t match a smoke event: a blue lavatory indicator alone denotes lavatory use; green indicators with no chimes indicate no alert; no indicators mean nothing is happening.