FAA AMT Airframe Practice Exam 2026 – Complete Exam Prep Guide

Thermocouples are ideal for detecting fire as they measure temperature rise compared to a reference temperature. Unlike the other options, optical sensors do not detect heat or temperature changes, rather they detect smoke particles. Ionization sensors are typically used to detect flames and not solely temperature changes. Similarly, infrared sensors are used for detecting heat radiation, but not necessarily for temperature changes in one specific area. Thermocouples are the best choice for accurately and effectively detecting temperature rise in a specific area.