Which of the following is a valid item to check for during pre-departure checks?

• A. Equipment is in good working condition
• B. Water levels in lavatories
• C. Passengers' seating preferences
• D. Temperature of galleys

Answer: (B)

Ensuring the cabin’s essential service systems are ready is the key idea. Checking water levels in lavatories directly tests the potable water supply and the flushing capability. If the water is low or unavailable, lavatories can’t be used properly, affecting hygiene and potentially signaling a pump or tank issue that could delay the flight if found after departure. This is a quick, clear indicator that the lavatory system is ready for use, which is why it’s a valid item to verify during pre-departure checks. While confirming that equipment is in good working condition is also important, the water level check specifically ensures the lavatory system will function as needed for the flight. Seating preferences and galley temperature aren’t checks that impact departure readiness.