Fire Protection Systems Flashcards
In what area of an aircraft would you find carbon monoxide (CO) detectors?
Cabins and cockpits, where easily visible.
What color does a CO detector change to when carbon monoxide fumes are present?
Green. Others may become grey or black.
What are two types of smoke detectors?
Photoelectric and visual.
Where are smoke detectors used in the aircraft?
Cargo and baggage compartments and laboratories.
How are thermal switches wired in a thermal switch fire detector system?
Thermal switches wired in parallel with each other, but in series with the indicator lights.
Describe the operating principle of a thermal switch fire detection system.
Thermal-sensitive switches close when sensing a temperature above a given threshold. With connections to a power source, these switches operate lights.
Describe the operating principle of a continuous loop fire detection system.
The continuous loop detector is a sensor whose internal resistance from outside conductor to inside conductor reduces above a given temperature, acting as a switch which then can be used to activate the alarm system.
How does a thermocouple fire detection system differ from the thermal switch system?
In a thermocouple fire detection system, the condition to be sense is a rapid change in temperature rather than a temperature sense above a pre-determined value.
What are two types of fire extinguishing systems?
High rate of change uses Halogen as an agent and is effective on all classes of fires. Conventional fire extinguishing uses CO2 and is effective on Class A and B fires.
What type of extinguishing agent is found in an HRD system?
Halogenated hydrocarbons (Halons). The most common is Halon 1301 ans is commonly referred to as Freon 13.
What type of extinguishing agent is usually associated with conventional fire extinguishing systems?
CO2.
What is the purpose of the yellow disk in a CO2 fire extinguishing system?
To indicate normal discharge of CO2 bottles.
In a turbine engine Freon fire extinguishing system, how are the bottles discharged?
Through the detonation of an explosive discharge cartridge (squib), breaking a brittle disk and releasing the agent.
How is a Freon fire extinguisher system protected from temperature rises in excess of set limits?
A thermal fuse will melt at high temperatures and blow a red discharge disk.
How can you determine the service life of a fire extinguisher discharge cartridge?
A manufacturer’s date stamp on the face of the cartridge.
