This because wheels and brakes accumulate a lot of heat on their take-off run.

Because of this, all components all over the airplane have bonding wire’s attached, so the static electricity caused by friction between two materials, like fuel through a fuel line or air gliding over the outside surface of the airplane, gets rooted back to ground.īoth main and nose gear wheel wells are also equipped with fire loops. NOTE: static electricity is also a possible ignition source. So it is mandatory that these components are monitor in respect to fire protection. Infact, on an engine or an APU you have fuel, oxygen, ignition systems, electricity, heat, all thing you only may bring together in a specific way and sequence. Those area’s only where fire or an overheat can occur.įor example: the main engines or the APU (Auxiliary Power Unit) are potential fire hazards, because fuel and electricity come together on the same component. Off course these loops are only used in specific area’s. If the fire is still present they push the push button underneath the fire handle to use the extinguishing bottle. The flight crew will pull the specific handle an close off fuel, hydraulics, and air between the engine that's on fire and the rest of the airplane. During this time the fire bell keeps on going. In case of a fire the light goes on an will stay on as long the fire isn't out. The Engine Fire handles of a Boeing 727, notice the wheel well light left to handle Nr 1. Then the flight crew can take corrective action to extinguish the fire. These warnings are both aural and visual by means of a fire alarm and a bright red light illuminates all at the flight deck. Low temperature gives high resistance so no output out of the loop, but when ever the temperature rises because of a fire or an overheat of some sort the resistance drops down permitting electricity to run trough the loop giving an output to the warning system at the flight deck. The main thing to know is that loops work with the principal of electric resistance. Within the loops there are a few different kinds, the working principal is somewhat different. How they do this critical job you can find out in this chapter.įire loops more exactly, are the component that’s responsible for detecting a fire. To protect the passengers, crew, and plane. But for an airliner it’s even a bigger threat because of his volume, fuel quantity on board, and last but not least, the amount of passengers! There for it is always been a big concern of the world’s main airplane manufacturers that fire onboard is quickly detected and extinguished. It goes without saying that fire is the biggest threat of all for an airplane of any shape or form. Fire detection is done by means of fire loops, smoke is detected true smoke detectors. One is the fire detection, the second part is the fire extinguishing. Within this chapter you have two main parts.

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Ata chapter 26