Engine Fire Protection Systems Flashcards
Which of the following fire detection systems are commonly used in an engine nacelle?
Kidde continuous-loop.
What is the function of a fire detection system?
To activate a warning device in the event of a powerplant fire.
(Refer to Figure 2.) Determine the fire extinguisher container pressure limits when the temperature is 75 degrees F.
338 minimum and 424 maximum.
How are most aircraft turbine engine fire-extinguishing systems activated?
Electrically discharged cartridges.
How does carbon dioxide (CO2) extinguish an aircraft engine fire?
Contact with the air converts the liquid into snow and gas which smothers the flame.
What retains the nitrogen charge and fire extinguishing agent in high rate of discharge (HRD) container?
Breakable disk and fusible disk.
A continuous-loop fire detector is what type of detector?
Overheat detector.
What is the operating principle of the spot detector sensor in a fire detection system?
A bimetallic thermoswitch that closes when heated to a high temperature.
How is the fire-extinguishing agent distributed in the engine section?
Spray nozzles and perforated tubing.
Which of the following is the safest fire-extinguishing agent to use from a standpoint of toxicity and corrosion hazards?
Bromotrifluoromethane (Halon 1301)
Which of the following is NOT used to detect fires in reciprocating engine nacelles?
Smoke detectors.
What is the principle of operation of the continuous-loop fire detector system sensor?
Core resistance material which prevents current flow at normal temperatures.
The most satisfactory extinguishing agent for a tailpipe or intake fire is what?
carbon dioxide.
The explosive cartridge in the discharge valve of a fire-extinguisher container is what?
a life-dated unit.
Why does one type of Fenwal fire detection system use spot detectors wired in parallel between two separate circuits?
So that a single fault may exist in the system without sounding a false alarm.
Which of the following fire detection systems measures temperature rise compared to a reference temperature?
Thermocouple.
The pulling out (or down) of an illuminated fire handle in a typical large jet aircraft fire protection system commonly accomplishes what events?
Closes fuel shutoff, closes hydraulic shutoff, disconnects the generator field, and arms the fire-extinguishing system.
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?
Lindberg continuous-element system.
The fire detection system that uses a single wire surrounded by a continuous string of ceramic beads in a tube is the what?
Fenwal system.
The fire detection system that uses two wires imbedded in a ceramic core within a tube is the what?
Kidde system.
A fuel or oil fire is defined as a what?
Class B fire.
A fire detection system that operates on the rate-of-temperature rise is a what?
thermocouple system.
A fire involving energized electrical equipment is defined as a what?
Class C fire.
Two continuous-loop fire detection systems that will not test due to a broken detector element are the what?
Kidde system and the Fenwal system.
Which statement best describes the blowout type indicator disk on a fixed fire extinguishing system?
When the yellow indicator disk is missing, it indicates the fire extinguishing system has been normally discharged.
The most satisfactory extinguishing agent for an electrical fire is what?
carbon dioxide.
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?
The Kidde system and the Fenwal system.
Which of the following fire detection systems uses heat in the normal testing of the system?
The thermocouple system and the Lindberg system.
After a fire is extinguished, or overheat condition removed in aircraft equipped with a Systron-Donner fire detector, the detection system…
automatically resets.
The use of water on Class D fires…
will cause the fire to burn more violently and can cause explosions.
For fire detection and extinguishing purposes, aircraft powerplant areas are divided into fire zones based on what?
the volume and smoothness of the airflow through engine compartments.
(Refer to Figure 3.) What are the fire-extinguisher container pressure limits when the temperature is 50 degrees F?
475 - 625 psig.
