What is indicated by the SMOKE AFT CARGO warning?

The SMOKE AFT CARGO warning indicates that smoke has been detected in the cargo area at the rear of the aircraft. This is a critical alert that prompts immediate action from the flight crew, as it signals a potential fire hazard in the cargo compartment. The detection of smoke necessitates following established procedures to assess the situation, which may include notifying cabin crew, preparing for emergency descent, and implementing firefighting protocols, depending on the severity and circumstances. Recognizing this warning is essential for maintaining the safety of the flight and preventing further escalation of any potential fire.

The other options focus on different types of system failures or anomalies that are not specifically related to the presence of smoke, which is directly indicated by this warning. Therefore, the correct interpretation relates firmly to smoke detection.