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