The CMS will display a ______ ______ message when smoke is detected in the lav.

• A. LAV SMOKE
• B. LAV SMOKE DETECTED
• C. CMS ALERT
• D. LAV WARNING

Answer: (A)

In the CMS annunciations, messages are kept short and location-focused so crew can react quickly. When smoke is detected in the lavatory, the display uses a concise, two-word label that identifies the area and the condition, so “LAV SMOKE” communicates exactly what is happening and where. There’s no need to add “detected” because the system has already triggered the indication. Longer or generic phrases don’t fit the standard practice: “LAV SMOKE DETECTED” adds unnecessary words, “CMS ALERT” doesn’t specify location, and “LAV WARNING” is less specific and deviates from the established format.