Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
23 Cards in this Set
- Front
- Back
|
Briefly describe the components of a thermal switch fire detection system
|
bimetallic Temperature sensitive switches that complete a circuit at a specific temperature and trigger a warning
|
|
|
Are thermal switches wired in series or in parallel with each other
|
Parallel
|
|
|
How are the detector units in a double loop Fenwall system wired
|
In parallel between two complete loops of wiring
|
|
|
In what way is a thermocouple fire warning system different from thermal switch system
|
Thermocouple systems are sensitive to the rate of temperature change where as thermal switch systems respond to a specific temperature value
|
|
|
Briefly describe the components of a Kidde continuous loop fire detection system
|
A Kidde system has an inconel tube containing one or more wires embedded in a ceramic core whose resistance changes with temperature
|
|
|
Briefly describe the components and operation of Lindberg fire detection
|
A stainless steel tube contains an inert gas and a discrete material that absorbs some of the gas. when the tube heats up some gas is released raising the pressure in the tube which activates a pressure switch
|
|
|
Describe the process or mechanism by which a photoelectric smoke detector generates a warning of a possible fire
|
Smoke particles refract light in the detector unit causing the photo electric cell to conduct electricity and trigger the alarm
|
|
|
How can the operation of a photoelectric smoke detector be tested
|
Test switch
|
|
|
name 2 types of smoke detection systems used in aircraft
|
1. Light refraction (photoelectric)types
2. Ionization types |
|
|
What are the usual locations where a carbon monoxide detector would be installed
|
Cockpit or cabin
|
|
|
How does a carbon monoxide detector indicate the presence of this deadly gas
|
The tan spot on the detector turns grey or black
|
|
|
What are the possible effects of kinks and Sharp bend's in the sensing elements of a fire warning system
|
False fire warnings caused by short-circuits
|
|
|
How is a Freon container checked for proper pressure
|
A chart must be used to determine the maximum and minimum gauge pressure readings based on the ambient temperature
|
|
|
Name the 2 basic types of fire extinguishing systems
|
1. conventional system
2. high rate discharge system |
|
|
Name the extinguishing agent most commonly used by conventional fire extinguishing systems
|
Carbon dioxide
|
|
|
Name the extinguishing agent most commonly used by high rate of discharge fire extinguishing systems
|
Halon (halogenated hydrocarbon type agents) also known as Freon
|
|
|
How are Freon bottles protected from excessively high temperatures and how can you tell that this has occurred
|
A thermal fuse (or blowout disks) will release the agent if the bottle temperature exceeds a certain limit. this blows out a red indicator disk
|
|
|
What condition is indicated if the yellow disc is missing in a fire extinguishing system
|
Normal discharge
|
|
|
Describe the mechanism by which a Freon bottle is discharged
|
An electric signal fires an explosive squib which ruptures a frangible disk
|
|
|
How is the service life of a discharge cartridge calculated
|
From the date stamp on the cartridge by the manufacturer
|
|
|
Where are smoke detectors used in the aircraft
|
They are commonly used in cargo and baggage compartments
|
|
|
What type of handheld fire extinguishers are available for extinguishing interior aircraft fires?
|
3 most common types are
1. Water 2. Carbon dioxide 3. Dry chemical |
|
|
what types of fire detector systems are used in engines?
|
1. Overheat
2. rate of temperature rise 3. Flame detectors |
