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Fire Protection systems > Final > Flashcards

Final Flashcards

0
Q

What is a Class A fire zone?

A

There are large quantities of air flow past regular arrangements of similarly shaped obstructions.

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1
Q

What are the two functions of a fire protection system ?

A

Detection, extinguishing.

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2
Q

What is a Class B fire zone?

A

Large quantities of air flowing past aerodynamically clean obstructions.

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3
Q

What is a Class C fire zone?

A

Relatively small quantities of air flow.

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4
Q

What is a Class D fire zone?

A

Little or no airflow

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5
Q

What is a Class X fire zone?

A

Large quantities of air flowing past regular arrangements if irregularly shaped obstructions and/or at irregular rates.

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6
Q

What does a zone determine?

A

The volume of extinguishing agent required.

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7
Q

What is an example of a class D fire zone?

A

Wheel wells and inside the wing

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8
Q

What is an example of a class C fire zone?

A

Engine accessory compartment

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9
Q

What is an example of a Class B fire zone?

A

Heat exchanger ducts, manifold shroud

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10
Q

What is a thermoswitch system?

A

Spot detector triggered by specific overheat temp.

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11
Q

Describe the operation of a fenwal system.

A

Electrical bimetallic switch mounted in stainless steel housing heats and expands, the contacts close to complete the warning circuit to power light/alarm.

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12
Q

What two metals are used in a thermocouple system?

A

Iron & constantan

Chromel and alumel

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13
Q

What is a continuous loop triggered by?

A

Specific overheat temp

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14
Q

What is an advantage of using continuous loop?

A

Provides more complete coverage.

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15
Q

Describe the construction of

The fenwal continuous loop system.

A

Single wire surrounded by ceramic beads wetted with eutlectic salts in an inconel tube

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16
Q

Describe the operation of a kidde continuous loop system.

A

Ceramic core changes resistance with temperature, allowing current to flow and activating the warning circuit.

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17
Q

What does a Lindbergh sensing element consist of?

A

A sealed, gas filled stainless steel tube.

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18
Q

What are three basic types of detectors?

A

Overheat
Rate of rise
Flame detectors

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19
Q

How are smoke detectors classified?

A

The principle of operation

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20
Q

What are the three classifications of smoke detectors?

A

Light refraction type
Ionization type
Solid state type

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21
Q

What concentration of carbon monoxide causes impairment?

A

.02%

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22
Q

Where are carbon monoxide detectors usually found ?

A

In the cockpit and cabin

23
Q

Explain the operation of a radiation detector

A

Fire emits an infrared radiation that is sensed by the detector.

24
Q

What is a class A fire?

A

Ordinary combustibles!

25
Q

What is a class B fire?

A

Flammable liquids!

26
Q

What is a Class C fire?

A

Energized electrical equipment!

27
Q

What is a Class D fire?

A

Flammable metal!

28
Q

What does the class of fire determine?

A

The type of agent required

29
Q

What are the three requirements for fire?

A

Oxygen, fuel, heat.

30
Q

What is the definition of fuel?

A

Something that will combine with oxygen in the presence of heat.

31
Q

What is the definition of oxygen?

A

An element that readily combines with other substances.

32
Q

What is heat?

A

The catalyst that accelerates the combining of oxygen and fuel.

33
Q

What fires can water be used on?

A

Only class A

34
Q

What fires can dry chemical powder be used on?

A

class ABC

35
Q

What class fires are inert cold gas agents used on?

A

Abc

36
Q

What class fires is specialized dry powder user on?

A

d

37
Q

What are handheld portable extinguishers required by?

A

FAR 23.851, 135.155

38
Q

What are unsuitable types of hand held extinguishers?

A

Co2, dry chemical.

39
Q

HRD systems provide high rate of discharge through:

A

High pressurization
Short feed lines
Large discharge valves and outlets

40
Q

What does a bottle transfer switch do?

A

Selects the second bottle which can then be discharged.

41
Q

What does pressing the bottle discharge switch do?

A

Ignites the squib, breaks a frangible disk, and discharges the HrD bottle.

42
Q

Why must special caution be taken with Fps maintenance?

A

Harsh environment , delicate construction, high pressure and explosive devices.

43
Q

When inspecting Fps what things must be checked?

A 
Security 
Cracked or broken wires or sections 
Abrasions 
Proper safety wiring 
Rubber grommets in place 
Dents and kinks
Nuts, right type and torque
Routing and proper support 8-12 in
Operation check
cO detectors should be inspected for discolouration and out of date
44
Q

What could cause an intermittent alarm?

A

An intermittent short

45
Q

What could cause the fire alarm and warning lights to occur when no fire or overheat condition exists?

A

A short, detector flaw,

46
Q

What is the most common cause of false alarms?

A

Kinks or sharp bends in a sensing element

47
Q

What is used to check sensing elements?

A

A mega ohm meter

48
Q

What could cause the failure to obtain an alarm?

A 
Defective test switch
Defective control unit 
Lack of source voltage 
Inoperative indicator light 
An open in the sensing element or connecting wires.
49
Q

Servicing and repair of the systems usually consists of what ?

A

Cleaning and replacement of components.

50
Q

What things do you want to inspect when dealing with extinguishing systems?

A 
Security of components
Bottle pressure indication
Squib date 
Leak test discharge tubing 
Wiring continuity 
Extinguishing system indicators
51
Q

What does a discharged yellow disk mean?

A

Agent has been discharged through cockpit controls

52
Q

What does a missing red disk indicate ?

A

Agent has been discharged as a result of over pressure/heat

53
Q

How often must extinguishing bottles be removed and tested?

A

Five years

54
Q

What is the extent of repair on extinguishing bottles?

A

Fluid line/electrical issues and replacement of components

Fire Protection systems (1 decks)

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