Jeppesen Oral- Chapter 16 (Fire Protection Systems)

Question 1

Does a thermocouple fire detection system warm the pilot of a general overheat condition?

Answer 1

No, it operates on the rate of temperature rise, and it identifies only a fire.

Question 2

Does a thermal switch fire detection warn the pilot of a general overheat condition?

Answer 2

No, it only actuates when there is a fire.

Question 3

What type of fire extinguishing agent is best for both cabin fires and engine fires?

Answer 3

Halon 1301

Question 4

What is a major disadvantage of “CB” fire extinguishing agent for extinguishing aircraft fires?

Answer 4

it is corrosive to aluminum and magnesium

Question 5

Why is carbon tetrachloride not recommended as a fire extinguishing agent?

Answer 5

Carbon tetrachloride produces phosgene, a deadly gas, when it is exposed to flames.

Question 6

What is used as a fire extinguishing agent in most of the high-rate discharge systems installed in aircraft?

Answer 6

One of the halogenated hydrocarbons, such as Halon 1301, pressurized with nitrogen.

Question 7

What is done when the Fire-Pull T handle is pulled in a jet transport aircraft?

Answer 7

The bottle discharge switch is uncovered and armed, the generator field relay is tripped, fuel is shut off to the engine, and hydraulic fluid is shut off to the pump. The engine bleed air is shut off and the hydraulic pump low-pressure lights are deactivated.

Question 8

What releases the fire extinguishing agent in a high-rate discharge bottle?

Answer 8

An electrically ignited powder charge blows a knife through a seal in the HRD bottle.

Question 9

What three types of fire extinguishers are recommended for extinguishing cabin fires in an aircraft?

Answer 9

Water, Halon 1301, and carbon dioxide.

Question 10

How does a carbon monoxide detector warn the occupant of an aircraft of an excess of carbon monoxide?

Answer 10

The detector crystals in the indicator change color.

Question 11

What are two types of smoke detectors used in an aircraft?

Answer 11

Photoelectric and visual smoke detectors

Question 12

What type of fire extinguisher is recommended for extinguishing a brake fire?

Answer 12

A dry-powder-type extinguisher

Question 13

How is a CO2 fire extinguisher checked for the amount of charge it contains?

Answer 13

by weight

Question 14

How can you determine whether or not a built-in fire extinguishing system has been discharged?

Answer 14

By checking the blowout plugs on the outside of the aircraft near the extinguisher agent bottles.

Question 15

What precaution must you observe when checking the electrical squib of an HRD fire extinguisher bottle for electrical continuity?

Answer 15

It takes only a small amount of current to ignite the powder charge, and the method of testing must not send this amount of current through it.

Question 16

What is indicated if the red disk in a built-in fire extinguishing system is blown out?

Answer 16

The agent bottle has been discharged because of an overheat condition.

Question 17

Briefly describe the components of a thermal switch fire detection system.

Answer 17

Temperature sensitive switches that complete a circuit at a specific temperature and trigger a warning.

Question 18

Are thermal switches wired in series or in parallel with each other?

Answer 18

parallel

Question 19

How are the detector units in a double-loop Fenwal system wired?

Answer 19

In parallel between two complete loops of wiring

Question 20

In what way is a thermocouple fire warning system different from a thermal switch system?

Answer 20

Thermocouple systems are sensitive to the rate of temperature change, whereas thermal switch systems respond to a specific temperature value.

Question 21

Briefly describe the components of a Kidde continuous loop fire detection system.

Answer 21

A Kidde system has an inconel tube containing one or more wires embedded in a ceramic core whose resistance changes with temperature.

Question 22

Briefly describe the components and operation of a Lindberg fire detection system.

Answer 22

A stainless steel tube contains an inert gas and a discrete material that absorbs some of the gas. When the tube heats up, some gas is released, raising the pressure in the tube, which activates a pressure switch.

Question 23

Describe the process of mechanism by which a photoelectric smoke detector generates a warning of a possible fire.

Answer 23

Smoke particles refract light in the detector unit causing the photoelectric cell to conduct electricity and trigger the alarm.

Question 24

How can the operation of a photoelectric smoke detector be tested?

Answer 24

By actuating a test switch.

Question 25

Name two types of smoke detection systems used in aircraft.

Answer 25

Light refraction (photoelectric) types and ionization types

Question 26

What are the usual locations where a carbon monoxide detector would be installed?

Answer 26

In an aircraft cockpit or cabin.

Question 27

How does a carbon monoxide detector indicate the presence of this deadly gas?

Answer 27

The tan spot in the detector turns gray or black.

Question 28

What are the possible effects of kinks and sharp bends in the sensing element(s) of a fire warning system?

Answer 28

False fire warnings caused by short circuits

Question 29

How is a Freon container checked for proper pressure?

Answer 29

A chart must be used to determine the maximum and minimum gauge pressure readings based on the ambient temperature.

Question 30

Name the two basic types of fire extinguishing systems.

Answer 30

The conventional system and the high-rate discharge system.

Question 31

Name the extinguishing agent most commonly used by conventional fire extinguishing systems.

Answer 31

Carbon dioxide (CO2)

Question 32

Name the extinguishing agent most commonly used by high-rate discharge fire extinguishing systems.

Answer 32

Halon (Halogenated hydrocarbon type agents), also known as Freon

Question 33

How are Freon bottles protected from excessively high temperatures and how can you tell that this has occurred?

Answer 33

A thermal fuse (or blowout disk) will release the agent if the bottle temperature exceeds a certain limit. This blows out a red indicator disk.

Question 34

What condition is indicated if the yellow disk is missing in a fire extinguishing system?

Answer 34

The system has been discharged normally.

Question 35

Describe the mechanism by which a Freon bottle is discharged.

Answer 35

An electrical signal fires an explosive squib, which ruptures a frangible disk.

Question 36

How is the service life of a discharge cartridge calculated?

Answer 36

From the date stamped on the cartridge by the manufacturer.