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4 ways to indicate 4
- Heat
- smoke
- heat rate of change
- light
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What are the two catagories of detector circuits
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What are 3 components of a fire detection system
- Test circuit
- detector circuit
- alarm circuit
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What are the 2 pnuematic systems
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3 maintenance items on a cont. loop system
- supported every 8-10 inches
- bend radius 3``
- No crushing , kinking, or chafing
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what are the 3 types of of ssmoke detectors
- light refraction
- ionization
- solid state
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what are 2 common extinguishing agents used in aircraft
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What does a missing red disk indicate
Over temp pressure discharge
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What does a missing yellow disc indicate
Shows a system discharge
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what is a HRD use for suppressant
Halon 1301
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how does a HRD use activate
an explosive squib breaks the flangible disc and releases
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how do you check the level of extinguishing agent in a HRD
weighing the tank
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true or false , Squibs are life limited
true
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true or false , CO detector buttons are life limited
false
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what is used as a propellant in a CO2 system
Nitrogen
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why is orienting fixed CO2 bottles important
if not oriented correctly , the pickup may not be able get all CO2
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What test must be done on all CO2 bottles every 5 years
Hydrostatic testing
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Which loop detection circuit uses Ceramic beads?
Fenwall
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How many electrodes are used in a fenwall continuous loop?
1 center conductor and inconel tubing is used for ground
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In a fenwall loop circuit what are the glass beads covered with?
Eutectic salts
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How many conductors are in a kidde loop system?
2 , one positive and one ground, also inconel tube is ground
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what is the material surrounding the center conductor in a kidde loop system called?
Thermistor or thermal resistor material
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of the pnuematic loop systems , which one is flexible and bent by hand?
Lindberg, Systron-Donner is rigid
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When checking routing of loop systems in hinge-clamped lines what must be looked at?
that the insulators split is toward the outside of the bend
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What is the proper distance of the clamps supporting a loop system?
8-10 inches
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What does a jetcal analyzer do?
used to physically test a sensing element by applying a known heat to see when the alarm is activated
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What is a example of class A fire zone?
Recip engine compartments
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What is an example of a class D fire zone?
Wheel well or inside of wing (little or no airflow)
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What are the 3 continous loop systems?
- Fenwal
- Systron-Donner
- Meggitt
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What is the benefit of a meggitt loop system?
If the loop breaks and the gas escapes it gives a fault indication
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On the lindberg loop system what is the pnuematic bellows assembly that senses pressure increase called?
Responder
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In a loop system what is the metal called that absorbs and releases gas?
discreet material
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Which spot system uses thermocouples?
Edison
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What is the benefit of a double loop system?
if the positive side grounds out , it switchs polarity and still works
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