Definition
An aircraft fire and overheat detection system that uses a long, slender sensing element routed through fire-prone areas such as engine compartments. The element is a sealed tube containing a temperature-sensitive core material whose electrical characteristics change when any portion of the loop is exposed to a fire or overheat condition, causing a control unit to trigger a warning to the flight crew.
Plain English
A long, thin heat-sensing wire that runs in a loop through engine and other fire-risk areas. If any part of the loop gets too hot, it tells the cockpit that there is a fire or overheat.
Context Anchor
Seen in aircraft engine fire detection, overheat warning, and maintenance discussions for engine compartments and other protected areas.
Derivation
Continuous-loop' describes the unbroken sensing element that forms a complete electrical loop around the protected area, so a fire anywhere along its length will be detected. The 'loop' shape also lets the system keep working even if one end of the wire is damaged in some designs.
Why Pilots Care
Gives early warning of engine fire or overheat so the pilot can shut down the engine, activate extinguishers if equipped, and execute emergency procedures before damage spreads.
Intuition Check
Continuous-loop does not mean the system keeps cycling on and off. It means the heat-sensing element is a continuous path through the protected area.
Example Sentence 1
During the engine fire checklist, the captain noted that the continuous-loop fire detection system had triggered the left engine fire warning.
Example Sentence 2
During the preflight, the mechanic tested the continuous-loop fire detection system by applying heat to a section of the sensor wire.