Fire Protection Systems Flashcards
Where are carbon monoxide detectors normally used?
An aircraft cabins and cockpits
What are indications of excess carbon monoxide fumes when using CO2 test?
Changes color due to a chemical reaction to a gray or black. Sophisticated detectors. Provide a digital output in parts per million of carbon monoxide present or illuminate a light or audible alarm sound
What does a thermal switch fire detection system consist of?
Heat sensitive units, that complete the electrical circuit at certain temperatures and trigger a warning
How are thermal switch units wired?
Parallel with each other and in series with the light
How is a thermocouple fire warning system different from a thermal switch system?
Thermal - works at a specific temperature
Thermocouple - depends on a rate of temperature rise
How are FENWAL sensing elements wired?
In series to a control unit
How are the detector units in a double loop FENWAL system wired?
In parallel between two complete loops of wire
Describe a continuous loop detection system?
One or more wires embedded in a special ceramic core, that changes its resistance with a change in temperature
How does a light refraction type (photo electric) smoke detector warn of possible fire?
Smoke particles in the air will cause the photoelectric cell to conduct electricity and trigger the alarm
How may a photoelectric smoke detector be checked?
Using a switch in the test circuit
Name two types of smoke detection instruments used in aircraft
Light refraction and ionization
What are two types of installed fire extinguisher systems?
CO2 and halogenated hydrocarbons
What protection is provided for a fire extinguisher bottle in case of a temperature rise in excess of set limits?
The agent dumps overboard, ejecting a red thermal discharge indicator disc
What type of extinguishing agent is usually found in a high rate discharge system?
How do you needed hydrocarbon type agents (halon)
What procedure is used to check a fire extinguisher container for pressure?
A chart must be used for determining minimum and maximum gauge reading based on temperature
What is the purpose of the yellow desk in a fire extinguisher system?
Indicates a normal system discharge
What indications may be caused by kinks and sharp bends in sensing elements of a fire detection system?
False warnings caused by a short
How is the service life of a discharge cartridge calculated?
From the manufacturer’s date stamp on the face of the cartridge
Describe the mechanism by which a Freon bottle is discharged?
An electrical signal fires an explosive squib, which ruptures a frangible disc
Name the extinguishing agent most commonly used by a conventional fire extinguisher system
CO2
Name the two basic types of fire extinguishing systems
The conventional systems and a high rate discharge system (HRD)
Briefly describe the components of a Kiddle continuous loop fire detection system
A kiddle system has in inconel loop whose resistance changes with temperature
Briefly describe the components and operation of a Lindberg fire detection system
A stainless steel tube contains an inert gas and a discrete material that absorbs some of the gas. With the tube heats up some gas is released, raising the temperature in the tube which activates a pressure switch.
