Final answer:
The red SMOKE light in the FWD or AFT push button on an aircraft is an indicator that smoke has been detected in the corresponding cargo compartment, suggesting a possible fire hazard.
Step-by-step explanation:
The red SMOKE light in the FWD or AFT push button (pb) on an aircraft is an indicator of smoke detection within the cargo compartments. This warning system is crucial for early detection of a potential fire onboard. When illuminated, it signifies that the aircraft's smoke detection system has identified the presence of smoke, suggesting a potential fire in the corresponding forward or aft cargo compartment.
The activation of this light typically initiates emergency protocols for the flight crew, which includes procedures to manage the possible fire hazard, such as deploying fire suppression systems if available and taking necessary steps to ensure the safety of the aircraft and its occupants