Detection
Where would a CO detector be found in an aircraft?
Cabin/cockpit/wherever the humans are
Define: HRD.
High-rate-of-discharge
This system measures temperature rise compared to a reference temperature.
Thermocouple
(rate of rise)
Extinguishing agent that should never be applied to an electrical or flammable-liquid fire.
Water
To be put out with water, what class of fire is comprised of combustible materials such as wood or paper?
Class A
Alarm that allows smoke to enter the chamber, reflecting light onto the light sensor. Typically found in non-passenger areas.
Photoelectric smoke alarm
Electrically actuated explosive device used to break the seal of fire extinguisher's bottle to release the agent.
Squib
Housed in an inconel tube, like a Fenwal system, but with dual conductors embedded in thermistor material.
Kidde
A longtime staple of the industry, this agent is being phased out because it is environmentally hazardous.
Halons
(Halogenated hydrocarbons)
Class of fire involving energized electrical equipment.
Class C
The point in a thermocouple where two dissimilar metals are joined and exposed to a fire's heat.
Hot junction
(The two metals are often chromel and constantan.)
These system types are located in high maintenance areas and are subject to damage.
Continuous loop systems
In this system, one end of the tube is connected to a diaphragm switch. The tube is filled with inert gas and detects a rise in pressure.
Lindberg
Converts to CO2 when it strikes heat or fire, smothering the flame.
Dry powder
Oil, grease, paints, jet fuel. All of these are fuel for what class of fire?
Class B
This smoke alarm type has a small amount of radioactive material between two electrically charged plates.
Ionization-type
(When smoke enters the chamber, it disrupts the flow of ions, thus reducing the flow of current and activating the alarm.)
What color disk may be exposed to indicate that the fire-extinguishing system was unintentionally discharged/that the contents have spilled out and overboard due to excessive heat?
Red
(A yellow disk indicates it was activated by a crewmember.)
The _____ system is wired between two parallel circuits so that a short can exist in either circuit without causing a false fire warning.
Fenwal
Built-in aircraft fire-extinguishing systems are typically charged with nitrogen and _______ _______.
Halogenated hydrocarbons
Fire in flammable metals, usually involving magnesium in the shop or aircraft wheels and brakes.
Class D
Light-refraction type smoke detectors detect the presence of smoke by sensing light reflected off of _____.
Smoke particles passing through a chamber
After correcting for ambient temperature, if an extinguisher container is not between the minimum and maximum limits, the container must be _____.
Also called spot detectors, _____ are heat-sensitive units that complete electrical circuits at a certain temperature.
Thermal switches
Of the two cold inert gases, _____ is the more effective one. It is disadvantageous though because it must be stored at ~320 degrees F as cryogenic liquid.
Nitrogen (N2)
Powerplant compartments are CLASSified into zones based on the amount of _____ through them.
Airflow
Class A, B, C, D, and X. See pg. 17-8.