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17. Fire Protection

QuestionAnswer
If a fire extinguisher cartridge is removed from a discharge valve, it should be? used only on the original discharge valve assembly.
Smoke detectors that use a measurement of light transmissibility in the air are called photoelectrical devices.
What occurs when a visual smoke detector is activated? A lamp within the indicator illuminates automatically.
The thermal switches of a bimetallic thermal-switch type fire-detection (single-loop) system are heat-sensitive units that complete circuits at a certain temperature. They are connected in parallel with each other, but in series with the indicator lights.
(Refer to Figure 21.) Determine what pressure is acceptable for a fire extinguisher when the surrounding area temperature is 33°F. (Rounded to the nearest whole number.) 215 to 302 psig.
On a periodic check of fire extinguisher containers, the pressure was not between minimum and maximum limits. What procedure should be followed? Replace the extinguisher container.
The types of fire-extinguishing agents for aircraft interior fires are water, carbon dioxide, dry chemical, and halogenated hydrocarbons.
A carbon dioxide (CO(2)) hand-held fire extinguisher may be used on an electrical fire if the horn is nonmetallic.
Built-in aircraft fire-extinguishing systems are ordinarily charged with halogenated hydrocarbons and nitrogen
Why does the Fenwal fire-detection system use spot detectors wired parallel between two separate circuits? A short may exist in either circuit without causing a false fire warning.
n some fire-extinguishing systems, evidence that the system has been intentionally discharged is indicated by the absence of a yellow disk on the side of the fuselage.
A fire extinguisher container can be checked to determine its charge by weighing the container and its contents.
A thermocouple in a fire-detection system causes the warning system to operate because it generates a small current when heated.
Light refraction smoke detectors are activated when the detector senses light reflected from smoke particles passing through a chamber.
The proper fire-extinguishing agent to use on an aircraft brake fire is dry powder chemical.
Which fire-extinguishing agent is considered to be the least toxic? Bromotrifluoromethane (Halon 1301).
When air samples contain carbon monoxide, portable carbon monoxide detectors containing yellow silica gel will turn which color? Green.
Which fire-detection system measures temperature rise compared to a reference temperature? Thermocouple.
Refer to Figure 21.) Using the chart, determine the temperature range for a fire-extinguishing agent storage container with a pressure of 330 psig. (Consider 330 psig for both minimum and maximum pressure.) 45 to 73°F.
The thermocouple fire-warning system is activated by a rate-of-temperature rise.
Smoke in the cargo and/or baggage compartment of an aircraft is commonly detected by which instrument? Photoelectric cell.
Which of the following are fire precautions which must be observed when working on an oxygen system? Display 'No Smoking' placards, provide adequate fire-fighting equipment, keep all tools and oxygen servicing equipment free from oil or grease, and avoid checking aircraft radio or electrical systems.
When used in fire-detection systems having a single indicator light, thermal switches are wired in parallel with each other and in series with the light.
Maintenance of fire-detection systems includes the replacement of damaged sensing elements.
A squib, as used in a fire-protection system, is a device for causing the fire-extinguishing agent to be released.
The most common cause of false fire warnings in continuous-loop fire-detection systems is dents, kinks, or crushed sensor sections.
What method is used to detect the thermal discharge of a built-in fire-extinguisher system? A rupture of the red plastic disk in the thermal discharge line.
What is the color code for fire extinguisher lines? Brown
A contaminated carbon monoxide portable test unit may be returned to service by removing the indicating element and installing a new indicating element.
In what areas of aircraft would you find a carbon monoxide detector? Cabin and cockpit.
Smoke detection instruments are classified by their method of detection
Created by: Jack Mollohan
 

 



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