Is it acceptable to dump leftover coffee down the LAV sink?

Dumping leftover coffee down the lavatory sink is not acceptable due to hygiene and operational protocols in onboard environments. Lavatory sinks are designated for wastewater only, and introducing food or beverage remnants can lead to clogging and sanitation issues. Regulations are in place to maintain cleanliness and proper functioning of the aircraft's plumbing system. Proper waste disposal practices ensure that the environment is kept sanitary for both crew members and passengers, and it prevents potential maintenance problems. Adhering to these guidelines reflects a commitment to safety and operational standards within the cabin service.