Engine Fire Protection Systems

Question 1

Which of the following fire detection systems are commonly used in an engine nacelle?

Answer 1

Kidde continuous-loop.

Question 2

What is the function of a fire detection system?

Answer 2

To activate a warning device in the event of a powerplant fire.

Question 3

(Refer to Figure 2.) Determine the fire extinguisher container pressure limits when the temperature is 75 degrees F.

Answer 3

338 minimum and 424 maximum.

Question 4

How are most aircraft turbine engine fire-extinguishing systems activated?

Answer 4

Electrically discharged cartridges.

Question 5

How does carbon dioxide (CO2) extinguish an aircraft engine fire?

Answer 5

Contact with the air converts the liquid into snow and gas which smothers the flame.

Question 6

What retains the nitrogen charge and fire extinguishing agent in high rate of discharge (HRD) container?

Answer 6

Breakable disk and fusible disk.

Question 7

A continuous-loop fire detector is what type of detector?

Answer 7

Overheat detector.

Question 8

What is the operating principle of the spot detector sensor in a fire detection system?

Answer 8

A bimetallic thermoswitch that closes when heated to a high temperature.

Question 9

How is the fire-extinguishing agent distributed in the engine section?

Answer 9

Spray nozzles and perforated tubing.

Question 10

Which of the following is the safest fire-extinguishing agent to use from a standpoint of toxicity and corrosion hazards?

Answer 10

Bromotrifluoromethane (Halon 1301)

Question 11

Which of the following is NOT used to detect fires in reciprocating engine nacelles?

Answer 11

Smoke detectors.

Question 12

What is the principle of operation of the continuous-loop fire detector system sensor?

Answer 12

Core resistance material which prevents current flow at normal temperatures.

Question 13

The most satisfactory extinguishing agent for a tailpipe or intake fire is what?

Answer 13

carbon dioxide.

Question 14

The explosive cartridge in the discharge valve of a fire-extinguisher container is what?

Answer 14

a life-dated unit.

Question 15

Why does one type of Fenwal fire detection system use spot detectors wired in parallel between two separate circuits?

Answer 15

So that a single fault may exist in the system without sounding a false alarm.

Question 16

Which of the following fire detection systems measures temperature rise compared to a reference temperature?

Answer 16

Thermocouple.

Question 17

The pulling out (or down) of an illuminated fire handle in a typical large jet aircraft fire protection system commonly accomplishes what events?

Answer 17

Closes fuel shutoff, closes hydraulic shutoff, disconnects the generator field, and arms the fire-extinguishing system.

Question 18

A fire detection system operates on the principle of a buildup of gas pressure within a tube proportional to temperature. Which of the following systems does this statement define?

Answer 18

Lindberg continuous-element system.

Question 19

The fire detection system that uses a single wire surrounded by a continuous string of ceramic beads in a tube is the what?

Answer 19

Fenwal system.

Question 20

The fire detection system that uses two wires imbedded in a ceramic core within a tube is the what?

Answer 20

Kidde system.

Question 21

A fuel or oil fire is defined as a what?

Answer 21

Class B fire.

Question 22

A fire detection system that operates on the rate-of-temperature rise is a what?

Answer 22

thermocouple system.

Question 23

A fire involving energized electrical equipment is defined as a what?

Answer 23

Class C fire.

Question 24

Two continuous-loop fire detection systems that will not test due to a broken detector element are the what?

Answer 24

Kidde system and the Fenwal system.

Question 25

Which statement best describes the blowout type indicator disk on a fixed fire extinguishing system?

Answer 25

When the yellow indicator disk is missing, it indicates the fire extinguishing system has been normally discharged.

Question 26

The most satisfactory extinguishing agent for an electrical fire is what?

Answer 26

carbon dioxide.

Question 27

Which of the following fire detection systems will detect a fire when an element is inoperative but will not test when the test circuit is energized?

Answer 27

The Kidde system and the Fenwal system.

Question 28

Which of the following fire detection systems uses heat in the normal testing of the system?

Answer 28

The thermocouple system and the Lindberg system.

Question 29

After a fire is extinguished, or overheat condition removed in aircraft equipped with a Systron-Donner fire detector, the detection system…

Answer 29

automatically resets.

Question 30

The use of water on Class D fires…

Answer 30

will cause the fire to burn more violently and can cause explosions.

Question 31

For fire detection and extinguishing purposes, aircraft powerplant areas are divided into fire zones based on what?

Answer 31

the volume and smoothness of the airflow through engine compartments.

Question 32

(Refer to Figure 3.) What are the fire-extinguisher container pressure limits when the temperature is 50 degrees F?

Answer 32

475 - 625 psig.