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M15 GTE > Fire Protection > Flashcards

Fire Protection Flashcards

1
Q

What are overhead detection sensors

A

Continuous loop

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2
Q

Continuous loop systems

A

Semi conductor & pneumatic presssure

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3
Q

What are pneumatic pressure loops manufacturers called

A

Systron & donner

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4
Q

How does pneumatic pressure work

A

Pressure of gas increases as temperature increases and operates switch

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5
Q

Semi condcutor loop names

A

Kiddie , graviner , Edison , Fenwal

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6
Q

How does semi conductor work

A

Tube that contains semi conductor material which decreases electrical resistance as temperature increases, alarm triggered when resistance decreases below a certain point

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7
Q

What’s a local fire warning

A

Red warning light on the overhead panel

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8
Q

What are central warnings

A

Red master warning lights , aural warning and message on ECAM/EICAS

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9
Q

How is central warning canceled

A

Pressing master warning light

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10
Q

What is normal condition

A

Open contact High resistance

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11
Q

What is alarm condition

A

Closed contact low resistance

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12
Q

What systems are dual loop systems

A

Essential fire warning systems

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13
Q

How does dual system work

A

You need to 2 detections to ensure a fire is happening , single failure doesn’t present a fire warning

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14
Q

When do we do a fire test

A

Before we start apu or engine

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15
Q

What does the ceramic function as in a semiconductor loop

A

As an endless number of resistors

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16
Q

What’s the tempreture coefficient of the ceramic

A

Negative

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17
Q

What loop does semi conductor use

A

Closed loop

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18
Q

When can fire not be detected in a semi conductor loop

A

In an open loop

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19
Q

What does a short circuit trigger

A

Fire warning

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20
Q

When does a short circuit happen

A

Resistance decreases below the alarm threshold of 500 ohms

21
Q

In a dual loop system what condition is needed to trigger fire warning

A

Alarm condition in both loops

22
Q

Max bending

A

3.2mm

23
Q

Minimum bend radius

A

25.4mm

24
Q

What does the first pressure switch do

A

Monitor or integrity switch

25
Q

What does second switch do in pressure loop

A

Alarm switch closes at higher gas pressure caused by overheat and fire

26
Q

What temperatures is high gas pressure close alarm switch

A

Complete loop temperature 200 degrees c

Small spot is heated to over 400 degrees c

27
Q

What fire bottle is used

A

Halon 1301 pressurised by nitrogen at 600psi

28
Q

Why is the discharge cartridge handled with care

A

Class c explosive

29
Q

What is the wire called that causes power to burn

A

Squib

30
Q

who can handle discharge cartridge

A

People who are permitted to carry class C explosives

31
Q

What prevents sparks from static electricity

A

Electrostatic protective cap

32
Q

What is discharge cartridge maximum service life

A

6 years

33
Q

What is the date on discharge cartridge

A

Date of manufacture

34
Q

What is the discharge cartridge shelf life

A

10 years

35
Q

What is the purpose of the pressure switch

A

Controls light on the fire control panel when pressure decreases below 50% of normal pressure

36
Q

How are pressure switch and indication checked

A

Small push button on pressure switch , aka spring loaded finger

37
Q

Another method checking pressure switch and indication

A

Use of Allen key

38
Q

What’s the Overpressure relief function

A

Prevent an explosion

39
Q

When does frangible disc break

A

Pressure increases to 1700psi

40
Q

What happens when bottle is discharged via thermal fuse

A

Amber light in cockpit and red disc is missing on the fuselage

41
Q

When is yellow disc pushed out

A

Bottle discharges via spray nozzles

42
Q

What does it mean if yellow disc is missing

A

Bottle is discharged and maintenance is necessary

43
Q

What must you do before extinguishing a fire

A

Affected compartment must first isolate all supplies

44
Q

How many fire extinguishing shots available per engine

A

2

45
Q

What system does apu use

A

One shot system

46
Q

Where is apu bottle located

A

Stabiliser compartment

47
Q

Is apu fire extinguishing possible on ground

A

Yes

48
Q

How does apu automatic fire extinguishing work

A

When fire warning activates and apu is auto shut down , circuit fires after 3 seconds

M15 GTE (19 decks)

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