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M15 > 15.20 > Flashcards

15.20 Flashcards

1
Q

What type of switch is a spot sensor?

A

Bi metallic

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2
Q

What type of loops are used for fire detection?

A

Continuous

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3
Q

What are the 2 continuous loops that can be used?

A

Semiconductor, pneumatic

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4
Q

Pneumatic pressure loop is called?

A

Systron and donner loop

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5
Q

In a control unit describe the contacts relationships with resistance and condition

A

High resistance is normal condition, low resistance is alarm condition

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6
Q

How many sensors are in a dual loop system?

A

2

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7
Q

What does a ceramic material function as?

A

Endless number of resistors

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8
Q

How long after a fault will the pilot receive a loop fault message?

A

15 seconds

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9
Q

The fire extinguishing system uses what agent?

A

Halon 1301

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10
Q

What pressure is halon at? And what is it pressurised by?

A

600 psi, nitrogen

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11
Q

What are the different weights of fire bottles and where are they?

A

Cargo - 20kg
Engine - 10kg
APU - 5kg

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12
Q

How much explosive powder is in the discharge cartridge?

A

400 milligrams

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13
Q

What is the maximum service life of the discharge cartridge?

A

6 years

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14
Q

What is the maximum storage life of a discharge cartridge?

A

10 years

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15
Q

When does the bottle light come on in the cockpit?

A

When bottled pressure goes below 50% of normal pressure

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16
Q

The push button for the fire bottles is so called?

A

Spring loaded finger

17
Q

How is an explosion of a bottle prevented due to over pressurisation?

A

Overpressure relief function

18
Q

When does the frangible disc break?

A

Pressure in bottle is at 1700 psi

19
Q

What colour is the disc pushed out when halon is released?

A

Red

20
Q

What colour disc do some aircraft have aswell as a red disc?

A

Yellow

21
Q

How many shot is a APU extinguisher to engine extinguisher?

A

APU - 1 shot
Engine - 2 shot

M15 (17 decks)

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