AF Fire Protection Systems

In what areas of aircraft would you find a carbon monoxide detector?

Cargo and baggage compartment.
Cabin and cockpit.
Lavatory and engine nacelle.

What occurs when a visual smoke detector is activated?

A warning bell within the indicator alarms automatically.
A lamp within the indicator illuminates automatically.
The test lamp illuminates and an alarm is provided automatically.

The types of fire-extinguishing agents for aircraft interior fires are

water, carbon dioxide, dry chemical, and halogenated hydrocarbons.
water, dry chemical, methyl bromide, and chlorobromomethane.
water, carbon tetrachloride, carbon dioxide, and dry chemical.

When air samples contain carbon monoxide, portable carbon monoxide detectors containing yellow silica gel will turn which color?

Blue.
Green.
Red.

Smoke detection instruments are classified by the method of

construction.
maintenance.
detection.

Smoke detectors that use a measurement of light transmissibility in the air are called

thermocouple devices.
photoelectrical devices.
ultraviolet optical devices.

A contaminated carbon monoxide portable test unit may be returned to service by

cleaning the indicating element with soap and water.
removing the indicating element and installing a new indicating element.
removing the indicating element from the exposed area for 24 hours.

When the detection system measures temperature rise compared to a reference temperature?

Fenwal continuous loop.
Lindberg continuous element.
Thermocouple.

A carbon dioxide (CO2 ) hand-held fire extinguisher may be used on an electrical fire if the

horn is nonmetallic.
handle is insulated.
horn is nonmagnetic.

The proper fire-extinguishing agent to use on an aircraft brake fire is

water.
carbon dioxide.
dry powder chemical.

Smoke in the cargo and/or baggage compartment of an aircraft is commonly detected by which instrument?

Chemical reactor.
Photoelectric cell.
Sniffer.

Light refraction smoke detectors are activated when the detector

measures a reduction in the amount of visible or infrared light in the surrounding area.
senses light reflected from smoke particles passing through a chamber.
uses radiation induced ionization to detect the presence of smoke.

Why does the Fenwal fire-detection system use spot detectors wired parallel between two separate circuits?

A control unit is used to isolate the bad system in case of malfunction.
This installation is equal to two systems: a main system and a reserve system.
A short may exist in either circuit without causing a false fire warning.

A fire extinguisher container can be checked to determine its charge by

attaching a remote pressure gauge.
weighing the container and its contents.
a hydrostatic test.

What is the color code for the extinguisher lines?

Brown.
Yellow.
Red and green.

The most common cause of false fire warnings in continuous-loop fire-detector systems is

improper routing or clamping of loops.
moisture.
dents, kinks, or crushed sensor sections.

A thermocouple in a fire-detection system causes the warning system to operate because

it generates a small current when heated.
heat decreases its electrical resistance.
it expands when heated and forms a ground for the warning system.

The thermocouple fire-warning system is activated by a

certain temperature.
core resistance drop.
rate-of-temperature rise.

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.
series with each other and the light.
series with each other and parallel with the light.

Built-in aircraft fire-extinguishing systems are ordinarily charged with

carbon dioxide and nitrogen.
halogenated hydrocarbons and nitrogen.
sodium bicarbonate and nitrogen.

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,

only 2 is true.
both 1 and 2 are true.
neither 1 nor 2 is true.

What method is used to detect the thermal discharge of a built-in fire-extinguisher system?

A discoloring of the yellow plastic disk in the thermal discharge line.
A rupture of the red plastic disk in the thermal discharge line.
The thermal plug missing from the side of the bottle.

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, and in parallel with the indicator lights.
parallel with each other but in series with the indicator lights.
series with each other but in parallel with the indicator lights.

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).

47 to 73 degrees F.
47 to 71 degrees F.
45 to 73 degrees F.

Refer to Figure 21. Determine what pressure is acceptable for a fire-extinguisher when the surrounding area temperature is 33 degrees F. (Rounded to the nearest whole number.)

215 to 302 psig.
214 to 301 psig.
215 to 301 psig.

On a periodic check of fire extinguisher containers, the pressure was not between minimum and maximum limits. What procedure should be followed?

Release pressure if above limits.
Replace the extinguisher contrainer.
Increase pressure if below limits.

In some fire-extinguishing systems, evidence that the system has been intentionally discharged is indicated by the absence of a

red disk on the side of the fuselage.
green disk on the side of the fuselage.
yellow disk on the side of the fuselage.

If a fire extinguisher cartridge is removed from a discharge valve, it should be

pressure checked.
used only on the original discharge valve assembly.
replaced with a new cartridge.

Which of the following are fire precautions which must be observed when working on an oxygen system?

Display “No Smoking” placards and keep all tools and oxygen servicing equipment free from oil or grease.
Display No Smoking” placards and provide adequate fire-fighting equipment.
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.

Which fire-extinguishing agent is considered to be the least toxic?

Carbon dioxide.
Bromotrifluoromethane (Halon 1301).
Bromochloromethane (Halon 1011).

Maintenance of fire-detection systems includes the

repair of damaged sensing elements.
servicing of the presure type responder system.
replacement of damaged sensing elements.

A squib, as used in a fire-protection system, is a

temperature-sensing device.
device for causing the fire-extinguishing agent to be released.
probe used for installing frangible disks in extinguisher bottles.

AF Fire Protection Systems

Jon K

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