Fire Protection Systems

Question 1

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

Answer 1

Cabin and cockpit.

Question 2

What occurs when a visual smoke detector is activated?

Answer 2

A lamp within the indicator illuminates automatically.

Question 3

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

Answer 3

Water, carbon dioxide, dry chemical, and halogenated hydrocarbons.

Question 4

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

Answer 4

Green.

Question 5

Smoke detection instruments are classified by their method of what?

Answer 5

Detection.

Question 6

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

Answer 6

Photoelectrical devices.

Question 7

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

Answer 7

removing the indicating element and installing a new indicating element.

Question 8

Which fire-detection system measures temperature rise compared to a reference temperature?

Answer 8

Thermocouple.

Question 9

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

Answer 9

horn is nonmetallic.

Question 10

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

Answer 10

Dry powder chemical.

Question 11

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

Answer 11

Photoelectric cell.

Question 12

Light refraction smoke detectors are activated when the detector what?

Answer 12

senses light reflected from smoke particles passing through a chamber.

Question 13

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

Answer 13

A short may exist in either circuit without causing a false fire warning.

Question 14

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

Answer 14

Weighing the container and its contents.

Question 15

What is the color code for fire extinguisher lines?

Answer 15

Brown.

Question 16

The most common cause of false fire warnings in continuous-loop fire-detection systems is what?

Answer 16

Dents, kinks, or crushed sensor sections.

Question 17

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

Answer 17

it generates a small current when heated.

Question 18

The thermocouple fire-warning system is activated by a what?

Answer 18

rate-of-temperature rise.

Question 19

When used in fire-detection systems having a single indicator light, thermal switches are wired in what?

Answer 19

Parallel with each other and in series with the light.

Question 20

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

Answer 20

halogenated hydrocarbons and nitrogen.

Question 21

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,

Answer 21

Both 1 and 2 are true.

Question 22

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

Answer 22

A rupture of the red plastic disk in the thermal discharge line.

Question 23

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 what?

Answer 23

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

Question 24

(Refer to Figure 21 (pg.151)) 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.)

Answer 24

45 to 73 degrees.

Question 25

(Refer to Figure 21 (pg. 151)) Determine what pressure is acceptable for a fire extinguisher when the surrounding area temperature is 33 degrees F. (Rounded to the nearest whole number)

Answer 25

215 to 302 psig.

Question 26

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

Answer 26

Replace the extinguisher container.

Question 27

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

Answer 27

yellow disk on the side of the fuselage.

Question 28

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

Answer 28

Used only on the original discharge valve assembly.

Question 29

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

Answer 29

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.

Question 30

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

Answer 30

Bromotrifluoromethane (Halon 1301)

Question 31

Maintenance of fire-detection systems includes the what?

Answer 31

replacement of damaged sensing elements.

Question 32

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

Answer 32

device for causing the fire-extinguishing agent to be released.