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M11 New > 11.8 > Flashcards

11.8 Flashcards

1
Q

What’s necessary for a fire to occur

A

Oxygen heat fuel

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2
Q

What should detectors not do

A

Automatically operate fire extinguishers in flight

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3
Q

What happens when overheat warning is detected

A

Illuminates amber master caution light and audible alarm

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4
Q

Where are overhear warnings used

A

Engine turbine areas

Nacelles

Wheel well areas

Hot pneumatic manifolds

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5
Q

When do thermal switch circuits complete

A

Once electrical circuit reaches a certain temperature

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6
Q

How are thermal switches connected

A

In parallel with eachother but series with the indicators

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7
Q

How does a raise in temperature cause a switch to produce a overheat condition

A

Once a certain temperature is reached it causes the switch to close which completes the circuit

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8
Q

What principle does thermocouple work on

A

The rate of temperature change

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9
Q

What’s a thermocouple constructed of

A

Two dissimilar metals such as chromel and constantan

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10
Q

What is a hot junction

A

Point 2 dissimilar metals join and exposed to the heat of fire

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11
Q

What resistance does a thermocouple not exceed

A

5 ohms

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12
Q

Advantage of continuous loop

A

More coverage of a fire hazard area

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13
Q

Two types of continuous loop systems

A

Thermistor type and pneumatic pressure

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14
Q

Thermistor type manufacturers

A

Kidde Fenwal

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15
Q

Pneumatic pressure sensor manufacture

A

Linberg & meggitt

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16
Q

How does Fenwal system work

A

Temperature cause resistance to drop with allows current to flow into control unit to produce a signal to output relay

17
Q

Filling compounds of Fenwal

A

Ceramic beads impregnated with eutectux slats

Aluminium oxide suspended in fibrous glass

18
Q

How is the kiddie system constructed

A

Two wires embedded in an inconel tube filled with thermistor core material

19
Q

How does the kiddie system detect fire

A

As the temperate increases the electrical resistance decreases

20
Q

How does the kiddie system detect fire

A

As the temperate increases the electrical resistance decreases

21
Q

How are continuous loop systems tested

A

Test switch in flight deck

22
Q

Principe of dual loop system

A

Both loops must signal in order to generate a fire warning

23
Q

What’s the logic of a dual loop system and what’s the advantage

A

‘ AND logic ‘

Advantage is that less change of false fire warnings

24
Q

Principle of pneumatic continuous loop

A

Gas expanding due to the application of heat

25
Q

Where are pneumatic continuous loops used

A

Engine overheat and fire detection

26
Q

What is a discrete temperate sensor filled with and the range

A

Hydrogen filled core

1100 degrees C for 5 seconds

27
Q

Are averaging and discrete functions reversible

A

Yes both are

28
Q

What are linberg , Systron-dinner and meggitt systems tubes filled with

A

Stainless steel tube filled with helium gas and length of titanium wire

29
Q

What does titanium wire do

A

Acts as gas absorption material

30
Q

When must a lavatory smoke detector be used

A

When 20 or more pax are being carried

31
Q

What system of fire detection does cargo use

A

Optical smoke detector which uses leds to monitor photodiodes

32
Q

How is the lavatory smoke detector powered

A

28v dc from left/right main DC bus

33
Q

How do you cancel the smoke indications in the lavatory

A

Pushing the lavatory call reset switch

34
Q

What makes the optical smoke detector go off

A

If the air has smoke , smoke reflect more light on the scatter detector which causes an alarm signal

35
Q

What is the photoelectric system

A

Light reflects onto the photocell which decreases the circuits resistance which allows output to the logic test systems

36
Q

What does the ionisation type smoke detector have on one side of the smoke detection chamber?

A

An electrode with a very small amount of radioactive material

Radioactive Material

37
Q

What happens when smoke comes into the chamber of the ionisation type smoke detector?

A

It affects the amount of ionisation and reduces the current flow between the electrodes

38
Q

What turns on the warning device in the cockpit when the current flow falls below a pre-set value?

A

A solid-state sensor

M11 New (17 decks)

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