Which situation could activate the fire and overheat warning indicators?

The activation of fire and overheat warning indicators is primarily associated with engine-related emergencies, particularly during engine fire events. When there is an actual fire in the engine compartment, the sensors designed to monitor temperature and smoke will detect abnormal conditions. In such situations, the warning indicators are triggered to alert the crew to a potentially life-threatening situation that requires immediate action.

Engine fire events can lead to a rapid rise in temperature, which the system is designed to identify quickly to ensure that crews can take appropriate measures, such as executing emergency checklists or considering an emergency landing. This ensures safety and enhances the chances of mitigating damage or injury.

High-altitude flight, sudden descent, and routine engine checks do not typically cause the activation of fire and overheat indicators. High-altitude flight may expose the aircraft to lower temperatures but does not inherently lead to overheating or fire risks. Similarly, sudden descent may change environmental pressures and temperatures but is not directly linked to causing fires or overheating of the engines. Routine engine checks are designed to run systems under normal parameters, ensuring that everything is functioning correctly and should not trigger alarms unless a fault is detected during the checks.