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M15 New > 15.20 > Flashcards

15.20 Flashcards

1
Q

What’s a fire zone

A

Areas that require fire detection or extinguishing equipment and high degree of fire resistance

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2
Q

What is thermodynamic failure

A

Cooling cycle is upset that causes turbine blades to melt

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3
Q

What is mechanical turbine failure

A

Fractured or thrown blades

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4
Q

3 types of fire detection

A

Over heat detectors

Rate of temperature rise detectors

Flame detectors

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5
Q

What’s a spot sensor used for

A

Uses individual sensors to monitor a fire zone

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6
Q

What type of sensor is employed on transport aircraft

A

Continuous loop system

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7
Q

How does a thermal switch work

A

Once temperature is above the set value the switch will close and generate a fire or overheat condition

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8
Q

How can we test lights

A

Bulb is tested by pressing it in to check an auxiliary test circuit

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9
Q

How does a thermocouple system work

A

Works on the rate of temperature rise detectors

If hot junction heats quicker then reference junction signal is given

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10
Q

What are optical sensors referred to as

A

Flame detectors

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11
Q

How do flame detectors work and what’s the 2 types

A

Detect presence of specific radiation emissions from hydrocarbon flames

IR & UV (uv used on light turboprop and helicopters)

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12
Q

How does pneumatic thermal fire detection work

A

As the gas is heated pressure causes switch to close the reports alarm

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13
Q

How is the average function activated

A

Expansion of a fixed volume of helium gas inside the detector

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14
Q

Average temperature sensor pre set temperature range

A

93-371 degrees C

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15
Q

Discrete temperature sensing range

A

1100 degrees C for 5 seconds

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16
Q

How does a discrete temperature sensor work

A

Outgassing of hydrogen from the core increases presssure and activates alarm switch

17
Q

What temperature sensings are reversible

A

Discrete and average

18
Q

Manufacture names of sensing systems

A

Lindberg , systron donner & meggitt

19
Q

What’s an advantage of dual loop

A

Increase the reliability of the system

20
Q

Manufactures of continuous loop detector systems

A

Fenwal & kiddie

21
Q

What material does fenwal use

A

Slender inconel tube

22
Q

What are the parts of a kiddie system

A

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

23
Q

How does kiddie system work

A

As temperature increases resistance to the ground decreases once it hits a certain resistance overheat indication appears in flight deck

24
Q

Advantage of sensing element

A

Can be routed close to non-hazardous hot spots that have normal temperature above the alarm temperature without causing a false alarm

25
Q

What’s the benefit to AND logic

A

Better reliably against false warnings

26
Q

What’s a dual loop system

A

Two complete fire detection systems with their output signals connected so that both must signal to result in a fire warning

27
Q

What test is done on a dual loop system

A

Pre flight integrity test

28
Q

What are transport category certified aircraft required to have

A

Two discharges

29
Q

Where is the single shot system used

A

Apu

Fuel burning

Heaters

Combustion equipment

30
Q

What is the most common extinguishing agent

A

Halon 1301

31
Q

What are fire bottles pressurised with

A

Nitrogen

32
Q

When is spherical designs used

A

Lightweight and when space is limited

33
Q

What’s a simple visual indicated gauge

A

Vibration-resistant helical bourdon type indicator

34
Q

What’s a benefit to a combination gauge

A

It provides an electrical signal if pressure is lost

No need to discharge indicators

35
Q

What does a red disc show

A

Contents has been dumped overboard due to excessive heat

36
Q

What does a yellow disc show

A

Extinguisher has been activated by the flight crew

37
Q

Where a fire switches

A

Centre overhead and awl or centre console in flight deck

M15 New (18 decks)

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