Final answer:
Thermal detectors and smoke detectors are commonly used for engine fire detection.
Step-by-step explanation:
There are two types of fire detector systems that are commonly used for engine fire detection:
- Thermal Detectors: These detectors sense an increase in temperature and are commonly used in engine compartments. They can detect high temperatures caused by engine fires and trigger an alarm or fire suppression system.
- Smoke Detectors: These detectors sense the presence of smoke particles in the air. They are commonly used in aircraft engine compartments to detect the early signs of a fire.