Download - Fire Detection
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AM 211 Fire Protection 5 Days /6hrs
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Twenty percent of the 1153 fatalities on U.S. transport airlines between 1981-1990 were caused
by fire
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Quickie in Electricity
The planetary model of the atom
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Sources of Electricity
• 1.Chemical ex. Battery• 2.Heat/Thermal ex. Thermocouple• 3.Pressure/Piezoelectric ex. Quartz• 4.Light ex. Selenium/Photo emissive• 5.Magnetism ex. Generators
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• Back to the Regulations……..
• Define the following per FAR part 1:• -Fire Proof• -Fire Resistance• -Flame Resistance• -Flammable• -Flash Resistant
• -What are the requirements for aircraft upholstery per FAR part 23?
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Fire Zones
(By airflow)-Class A Zone- large volume of air over/threw similarly
shaped objects
-Class B Zone- large volume of air over/threw aerodynamically clean objects
-Class C Zone- low airflow
-Class D Zone- little to no airflow
-Class X Zone- large quantity of turbulent air (Very difficult to extinguish fires in these areas)
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Requirements for Overheat & Fire Detection Systems
• -prevent false warnings• -rapid and accurate indication• -indicate the fire was extinguished• -automatically reset/ indicate re-ignition• -continuous indication• -testable• -resist exposure• -indication by a light of location and audible alarm• -separate sensing elements for each engine
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MD-11
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Fire Detection and Overheat Systems
• Spot Type Individual switches or detectors -Thermo-switch -Thermocouple
• Continuous Loop Single detection element - Pneumatic (gas) - Thermo-resistive switch
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Thermocouples
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Cylinder Head Temp Thermocouple
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Thermocouples for Fire Detection
-Rate of Rise Spot Detector made of two dissimilar metals that produce a small current (about 4ma) when heated.- Components : - Reference thermocouple - Active thermocouple - Sensitive relay - Slave relay - Heater (for the test circuit) - Visual and oral warning
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Continuous Loop Systems
• All continuous loop systems have a single sensing element but vary in construction
• Thermal-Resistive Loops• Fenwal system• Kidde system
• Pneumatic (gas) Loops• Lindberg system• Systron-Donner System (Whittaker)• Meggitt System
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Fenwal
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Kidde
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Pneumatic Systems• Recall from Physics:
-As a gas is heated, if the volume remains the same, the pressure will increase proportionally.
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Inspections
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Jetcal Analyzer
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Smoke and Toxic Gas
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Typical Installation
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Fire Extinguishing Systems• Agents• -Halon (*1301 & 1211)• -Carbon Dioxide• Systems• -Portable• -Fixed• -conventional• -high rate of discharge (HRD)
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Halon & HRD Systems• The most commonly used agent for
aircraft is Halon 1301 (bromotrifluoromethane CF3Br)
• Halon Production was banned in 1998 due to the environmental impact. Halon destroys ozone O3.
• Halon eliminates fire by displacing oxygen and may do the same in your lungs in confined areas.
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Squib Cartridge
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Alternatives to Halon• Many manufactures are struggling to
replace Halon with an equally effective , non-corrosive, safe agent.
• Hydro-clean agents• FE-25 by DuPont• Phosphorous tribromide (PBr3) PhostrEx• And many more……
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Boeing 727
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• 727 Fire Control Panel
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