Fire Detection and Protection Flashcards
An area or region of an aircraft designated by the manufacturer which will require fire detection is called?
Fire Zone
List some of the features that should be included in fire detection to ensure reliable operation?
Will not cause false warnings, should actuate a cockpit light indicating the location of the fire and activate an audible alarm system, a separate detection system for each fire zone, provide a rapid indication of fire, accurate indication that a fire is extinguished, continuous indication for duration of fire, detectors which are lightweight and adaptabe to any mounting position, means for electrically self-testing the detector system from the aircraft cockpit, minimal electrical current requirements when not indicating a fire, and detectors which resist damage due to exposure to oil, water, vibration, extreme temperatures, and maintenance handling.
What are the two types of fire detection systems used on Coast Guard aircraft and give two examples of each.
Spot Detector: thermoswitch, photocell. Continuous Loop: Lindberg (Responder), Fenwal Detector.
Spot detectors are also known as what, and where are they installed?
Pinpoint detectors, installed in locations where there is the greatest possibility of a fire or overheat situation such as APU enclosure, turbine casings, and engine firewall areas.
How do thermal switches (spot detector type) work?
Thermal switches (bi metallic) that distort or bend at a pre-set temperature rise and completes an electrical circuit-illuminating indicator lights in the cockpit.
How do photocells (spot detector type H-60) work?
Sense infrared radiation produced by a fire or extreme overheat in an engine or APU compartment and completes an electrical circuit to the control unit.
How does the Lindberg/Responder unit (continuous loop type) work?
Tubes with a responder (sensor) permanently connected at one end, tube contains an inert gas that expands with temperature rise and closes the second end of the switch causing an electrical circuit to be completed.
What does the fire detection control unit monitor?
The electrical resistance of the fire detector systems sensing elements.
How quickly do extinguishing systems provide extinguishing agent to affected areas in Coast Guard aircraft? And what is this system referred to as?
Within 2 seconds. high rate of discharge system
Though multiple types of distribution systems and components are utilized in CG aircraft, What is the agent used and how is it delivered?
Halogenated hydrocarbons, distributed by a nitrogen-pressurized extinguisher bottle.
What type of extinguishing agent storage bottles does the CG use and how many minimum per aircraft?
Sphere-type, minimum 2 bottles
