Classes and Extinguishers
A fuel or oil fire is defined as what class of fire?
Class B fire.
What is the function of a fire detection system?
To activate a warning device in the event of a powerplant fire.
Which detectors are NOT used to detect fires in reciprocating engine nacelles?
Smoke detectors.
The fire detection system that uses a single wire surrounded by a continuous string of ceramic beads in a tube is the?
Fenwal system.
How are most aircraft turbine engine fire-extinguishing systems activated?
Electrically discharged cartridges.
A fire involving energized electrical equipment is defined as what class of fire?
Class C fire.
A continuous-loop fire detector is what type of detector?
Overheat detector.
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 fire detection system that uses two wires imbedded in a ceramic core within a tube is the
Kidde system.
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.
The use of water on Class D fires will cause what?
The fire to burn more violently and can cause explosions.
Which of the fire detection systems are commonly used in an engine nacelle?
Kidde continuous-loop.
Which of the fire detection systems measures temperature rise compared to a reference temperature?
Thermocouple.
A fire detection system that operates on the rate-of-temperature rise is a?
thermocouple system.
What retains the nitrogen charge and fire extinguishing agent in a high rate of discharge (HRD) container?
Breakable disc and fusible disc.
The most common type of portable fire extinguisher available on the ramp to fight fires on the exterior of aircraft uses what type of extinguishing agent?
Carbon dioxide (CO2).
For fire detection and extinguishing purposes, aircraft powerplant areas are divided into fire zones based on the volume and smoothness of what?
The airflow through engine compartments.
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.
Two continuous-loop fire detection systems that will not test due to a broken detector element are the
Kidde system and the Fenwal system.
After a fire is extinguished, or overheat condition removed in aircraft equipped with a Systron-Donner fire detector, the detection system does what?
Automatically resets.
Which of the following is the safest fire-extinguishing agent to use from a standpoint of toxicity and corrosion hazards?
Bromotrifluoromethane (Halon 1301).
What is the operating principle of the spot detector sensor in a fire detection system?
A bimetallic thermo-switch that closes when heated to a high temperature.
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.
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 statement best describes the blowout type indicator disc on a fixed fire extinguishing system?
When the yellow indicator disc is missing, it indicates the fire extinguishing system has been normally discharged.