Fire Protection Systems
(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
(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
What occurs when a visual smoke detector is activated?
A lamp within the indicator illuminates automatically
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
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
Which fire-extinguishing agent is considered to be the least toxic?
Bromotrifluromethane (Halon 1301)
What is the color code for fire-extinguisher lines?
Brown
In what area of an aircraft would you find a carbon monoxide detector?
Cockput and/or cabin
When air samples contain carbon monoxide, portable carbon monoxide detectors containing yellow silica gel will turn which color?
Green
Built-in aircraft fire-extinguishing systems are ordinarily charged with
Halogenated hydrocarbons and nitrogen
Smoke in the cargo and/or baggage compartment of an aircraft is commonly detected by which instrument?
Photoelectrical cell
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
Which fire-detection system measures temperature rise compared to a reference temperature?
Thermocouple
In reference to aircraft fire-extinguishing systems, (1) during removal or installation, the terminals of discharge cartridges should be grounded or shorted. (2) before connecting cartridge terminals to the electrical system, the system should be checked with a voltmeter to see that no voltage exists at the terminal connections. Regarding the above statements,
both No. 1 and No. 2 are true
The most common cause of false fire warnings in continuous-loop fire-detection systems is
dents, kinks, or crushed sensor sections
Smoke detection instruments are classified by their method of
detection
A squib, as used in a fire-protection system, is a
device for causing the fire-extinguishing agent to be released
The proper fire-extinguishing agent to use on an aircraft brake fire is
dry powder chemical
A carbon dioxide (CO(2)) hand-held fire extinguisher may be used on an electrical fire is the
horn is nonmetallic
A contaminated carbon monoxide portable test unit would be returned to service by
installing a new indicating element
A thermocouple in a fire-detection system causes the warning system to operate because
it generates a small current when heated
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
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
Smoke detectors which use a measurement of light transmissibility in the air are called
photoelectrical devices
The thermocouple fire-warning system is activated by a
rate-of-temperature rise
Maintenance of fire-detection systems includes the
replacement of damaged sensing elements
Light refraction smoke detectors are activated when the detector
senses light reflected from smoke particles passing through a chamber
If a fire extinguisher cartridge is removed from a discharge valve, it should be
used only on the original discharge valve assembly
The types of fire-extinguishing agents for aircraft interior fires are
water, carbon dioxide, dry chemical, and halogenated hydrocarbons.
A fire-extinguisher container can be checked to determine its charge by
weighing the container and its contents
In 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
Which of the following are fire precautions which must be observed when working on an oxygen system? 1. Display 'No Smoking' placards. 2. Provide adequate fire-fighting equipment. 3. Keep all tools and oxygen servicing equipment free from oil or grease. 4. Avoid checking aircraft radio or electrical systems.
1,2,3, and 4
