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M11 > 11.8 Fire Protection > Flashcards

11.8 Fire Protection Flashcards

1
Q

What is fitted in large areas and where the fire source is not known?

A

Smoke detectors

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2
Q

What is used in engines, APU, wheel well and hot air ducts for overheat detection?

A

Temperature sensitive detectors

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3
Q

What type of switch is the spot sensor?

A

Bi-metallic type switch

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4
Q

What are the 2 types of continuous loops for fire detection?

A
  1. Semi conductor loop
  2. Pneumatic pressure loop
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5
Q

What type of sensor is always on the engine fire detection system?

A

Dual continuous loop

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6
Q

What types of continuous loops are found on engines?

A

Both

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7
Q

What is the local warning of a fire detection system?

A

Red light inside a switch

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8
Q

What type of system do all essential fire warning systems use?

A

Dual loop systems

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9
Q

When is a fire warning triggered in a dual loop system?

A

If both sensors detect fire at same time

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10
Q

What is the ground warning in the APU fire detection system?

A
  • if cockpit empty
  • in nose or main wheel well area
  • red light flashes and warning horn sounds
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11
Q

What are the 2 types of sensors in the pneumatic duct leak detection system?

A
  1. Spot sensor
  2. Semiconductor continuous loop
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12
Q

What is a disadvantage of the bi-metallic sensor system?

A

Control unit cannot detect a fault condition of this sensor

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13
Q

Where does the warning for a pneumatic dict leak appear?

A

Pneumatic or air conditioning panel

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14
Q

⚠️Class A (baggage compartment/wardrobe - accessible )

A

❌ fire detection system
❌ extinguishing system

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15
Q

⚠️Class B (lower or upper deck cargo compartment - accessible )

A

✅ fire detection system
❌ extinguishing system

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16
Q

⚠️Class C (lower or upper deck cargo compartment - not accessible)

A

✅ fire detection system
✅ extinguishing system

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17
Q

⚠️Class D (lower deck cargo compartment - small amount or no ventilation)

A

(Not required until 2003)
✅ fire detection system
✅ extinguishing system

18
Q

Class E (cargo compartment in a freighter aircraft)

A

✅ fire detection system
❌ extinguishing system

19
Q

How is the central warning cancelled on the ECAM or EICAS display?

A

Pressing the master warning light

20
Q

⚠️What are the manufacturers names for semiconductor loops?

A

Kidde, Graviner, Edison or Fenwal

21
Q

What are the 2 types of smoke detectors?

A
  • optical system
  • ionization type
22
Q

How do semiconductor loops work?

A

Decreases electrical resistance with increasing temperature

23
Q

How do pneumatic pressure loops work?

A

As gas increases with temperature it operates a pressure switch

24
Q

⚠️How does the kidde, Fenwal, Graviner or Edison type conductors works?

A

Have a negative temperature coefficient (NTC)

25
Q

How many internal wires does kidde manufacture have?

A

2

26
Q

How many internal wires does Fenwal, Grabiner or Edison manufacturers have?

A

1

27
Q

⚠️What happens when resistance of an area decreases below 500ohms?

A

Alarm is triggered

28
Q

⚠️What is the normal resistance?

A

Between 1ohms for long loops and 10ohms for short loops

29
Q

What is the minimum radius for loop installation?

A

No less than 25.4mm

30
Q

What is the maximum bend for loop installation?

A

No more than 3.2mm

31
Q

How does ionization type smoke detector work?

A

Clean air has light molecules, smoke molecules are heavier

32
Q

⚠️What are the 2 types of halon extinguishers?

A

1301 (installed)
1211 (portable -least toxic)

33
Q

How can you check a portable fire extinguisher hasn’t been used before?

A
  • pressure gauge in green band
  • safety pin installed
34
Q

What is the installed fire extinguisher pressurised by, what psi, what temp?

A

Nitrogen, 600psi, 20*c

35
Q

What weight are cargo compartment fire extinguishers?

A

20kg

36
Q

What weight are engine fire extinguishers?

A

10kg

37
Q

What weight are APU fire extinguishers?

A

5kg

38
Q

Overpressure relief function - RED?

A

1700psi +

39
Q

Overpressure relief function - YELLOW?

A

Bottle is discharged

40
Q

What is the firing circuit supplied by to make it as safe as possible?

A

Hot battery bus

41
Q
A

M11 (2 decks)

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