Unit 3-2 Flashcards
What are the two separate systems in fire protection?
What type of system are these considered?
Fire detection system
Fire control system
Auxiliary system, not necessary for flight operation, but for convenience, comfort, and safety
What areas are considered Class A compartments?*
Can fire be immediately accessed?*
What must these areas be equipped with?*
Crew and passenger areas
Yes
Fire may be visually detected, reached, and combated by flight crew members (have a fire extinguisher provided)
Approved type of smoke detector or fire detector
What areas are considered Class B compartments?*
Can fire be immediately accessed?*
What must these areas be equipped with?*
Cargo and baggage compartments
Yes
Must have sufficient access to enable a crew member to reach all parts of the compartment effectively with a portable fire extinguisher while in flight
Approved type of smoke detector or fire detector
What areas are considered Class C compartments?*
Can fire be immediately accessed?*
What must these areas be equipped with?*
Inaccessible compartments (e.g., aircraft engine areas)
No
Fire detection and fighting done by remote sensors and fire control
Ventilation in each compartment so that any fire will be confined and will not progress beyond safe limits
What areas are considered Class D compartments?*
How are they designed?*
What must these areas be equipped with?*
Inaccessible cargo and baggage areas
Designed so fire will be completely confined to that area and do not endanger the safety of the aircraft/people
Ventilation in each compartment so that any fire will be confined and will not progress beyond safe limits
What areas are considered Class E compartments?*
How are they designed?*
What must these areas be equipped with?*
Cargo Aircraft only
Cabin (cargo) area classified as a Class E
No windows, or specialty shades lined with fire resistant
Smoke/fire detector
Ability to shut-off compartment air flow
Controlled from flight deck
Ability to isolate hazardous smoke, flames, and gases from the flight deck area
What are the two types of fire detection systems?*
Spot detector
Continuous loop
What does a spot detector do?*
Monitor temperature in one location using a thermocouple that produces electrical current when heated
What do continuous loop detectors do?*
Monitors temperature in a greater area using wires embedded in a special ceramic
Ceramic changes resistance with heat
Heat = more current flow = fire detection
What is the purpose of a smoke detection system?*
Early warning
Detect smoke present in a specific zone
What are the two types of smoke detectors?*
Describe how each detects smoke
Photoelectric cell (light refraction)
Light sensor sends an electrical signal to the warning system controller if it can’t detect enough light
Ion detector
The detector samples air for ionized air (smoke)
Electrical signal is sent to the warning system
Americium (radioactive element) powers sampling chamber
What are the four classes of fire and what does each include?*
Class A – Paper, wood, cloth, trash
Class B - Flammable liquids
Class C - Electrical Equipment
Class D - Certain metals such as magnesium and titanium
What three things does a fire need to start and continue burning?*
How can you stop a fire?*
Oxygen, heat, and fuel (fire triangle)
“Break” one of the legs of the fire triangle
What type(s) of fires are water fire extinguishers used for?
How do they extinguish fires?*
What are some problems with this fire extinguisher?
Class A fires – paper, wood, cloth, trash
Absorbs heat to cool fire and extinguish it
Pressurized water gets rid of the “heat” leg of the triangle
Water freezes (loaded stream adds alkali salt as an anti-freezing agent)
Ineffective, and even dangerous, on other classes of fires
What type(s) of fires are foam fire extinguishers used for?
How do they extinguish fires?*
What are the types of foam fire extinguishers?
Class A and B fires
Cools, smothers and creates a vapor barrier
Gets rid of the “oxygen” leg of the triangle
Stored pressure (water based)
Aqueous Film-Forming Foam (AFFF)
Film-Forming Fluoroprotein Foam (FFFP)
