Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

CAA Module 11 > Module 11.8 Fire protection > Flashcards

Module 11.8 Fire protection Flashcards

1
Q

What is a fire zone?

A

Area of an aircraft designed to require detectors and/or fire extinguishers and high level of resistance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Fire detection in small turbo prop or piston aircraft tend to use two or more of what detection devices?

A
  • Overheat detectors
  • Rate of temp rise detectors
  • Flame detectors
  • Crew observation
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What zones have fixed fire detection?

A
  • APU + engines
  • Cargo areas
  • Lavs
  • Electrical equipment compartments
  • Wheel wells
  • Bleed air ducts
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Fire warning systems are installed to alert the crew of what?

A

Warn of fire or overheating that could lead to a fire

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What detectors may be used on larger aircraft? (Fire related)

A
  • Rate of temp rise
  • Radiation sensing
  • Carbon monoxide
  • Combustible mixture
  • Smoke
  • Overheat
  • Optical
  • Observation
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What happens when an overheat condition is detected?

A

Illuminate light and audible alarm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What are the most common fire detection systems?

A
  • Thermal switches
  • Thermal couples
  • Continuous loop sensing elements
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

How are the thermal switches connected in a circuit?

A

Switches in parallel but in series to indicator lights

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

How are the circuits tested?

A

Pressing a push-to-test button that operates an auxiliary circuit

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

The test in a thermoswitch circuit can not check for what?

A

Serviceability of the individual thermoswitches. Only tests general serviceability of the circuit

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Thermocouples do not give warning when what occurs?

A

Slow increase in temperature or shorting

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

How does the testing system work in a thermocouple system?

A

Heating element activated that heats the hot junction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What does a Fenwal continuous loop system consist of?

A

Inconel tube with a nickel wire inside it. The nickel wire is surrounded by a eutectic salt

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

How does the Fenwal system work?

A

Small current passed through the nickel wire, if the housing is heated then the eutectic properties change and resistance drops. This completes a circuit and lights a warning light

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is the additional part in a Kidde system?

A

An earth wire next to the nickel wire. It is earthed to the inconel tube

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Why is a dual loop system used?

A

Both most be activated to activate alarm, allows for reliability of results. If one is damaged then the remaining one can still give alarm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

How are pneumatic sensors made to ensure reliability?

A

Mechanical damage does not cause false alarm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What are the two types of pneumatic sensing?

A
  • Average
  • Discrete
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

How is the average temp sensing activated?

A

Expanding of fixed volume of helium

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

When would hydrogen gas be released into detector cone in discrete sensing?

A

If a small section of the sensor is heated for 5 seconds in the temp range (1100C)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

How is the switch closed in lindberg etc. system?

A
  • Helium pressure increase
  • Hydrogen release
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

What should sensing elements be maintained and inspected for?

A
  • Cracking or damage
  • Abrasion
  • Things that may cause a short circuit
  • Condition of the rubber grommet
  • Dents and kinks
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

What are the two basic types of smoke detection?

A
  • Ionisation
  • Photoelectric
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

How does the photoelectric system work?

A

Light shone across sample if light is reflected into photodiode then the resistance drops allowing an output to the AFOLTs system

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

What happens if smoke flows through the chamber in an ionisation system?

A

Current on reduced due to a reduction in ionisation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

Cargo smoke detector systems use what method?

A

Optical

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

How do optical detectors work?

A

Air goes through condensers to remove moisture it is then heated. The amount of light that is reflected onto the scatter detector will raise an alarm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

What aircraft require smoke detectors in the toilet?

A

Over 20 people

29
Q

What must the lavatory be equipped with?

A

Smoke detector and extinguishing system

30
Q

What zones have fire extinguishing system?

A
  • Engines
  • APU
  • Forward and aft cargo bay
  • Lavatories
31
Q

What do the fire extinguishing bottles hold?

A

Halon 1301 pressurised with nitrogen gas

32
Q

What safety mechanism do fixed bottles have?

A

They have a diaphragm that fractures to stop the bottle exceeding test pressure in the event of excessive temp exposure

33
Q

What are the two cartridge disk release methods?

A
  • Standard type, slug driven into the diaphragm
  • High temp/hermetically sealed, direct explosive impact to rupture prestressed CRES diaphragm
34
Q

What may some bottles be equipped with?

A

Basic visual indication pressure gauge

35
Q

What is the only location where fixed extinguishers are auto discharged?

A
  • Lavatories
  • APU
36
Q

What is a combination gauge?

A
  • Gives bottle pressure
  • Electrical signal if the pressure is lost
37
Q

What is commonly used in fixed fire bottles and the problem with this?

A

Halon 1301, can not be produced and new aircraft produced after 28/11/24 can not use it

38
Q

what is a two way check valve?

A

Used on twin engine aircraft to prevent extinguisher agent from a second bottle backing up into the past emptied main container

39
Q

What are the two types of commonly used discharge indicators?

A
  • Thermal discharge (Red)
  • Discharge indicator (Yellow)
40
Q

What does the ejection of a red disk mean?

A

That the contents was ejected due to overheat and the bottle will need replacing

41
Q

What does the ejection of a yellow disk?

A

The bottle has been discharged by flight crew input. Replace the bottle pre flight

42
Q

How are fire bottles operated?

A

Electrically after flight crew selection

43
Q

When is a APU extinguishing auto?

A

During ground servicing/operations

44
Q

What systems must be followed with regards too regulation of release of extinguisher agent?

A

Two shot

45
Q

What must be done prior to discharge of agent?

A

Isolate from systems and shut down

46
Q

What fractures the diaphragm in the extinguisher bottles?

A

Squib

47
Q

What is the purpose of the guard on the extinguisher button?

A

To stop accidental operation

48
Q

What happens when the fire push button is pressed?

A
  • Engine driven generator switched off
  • All associated bleed air valves close
  • Low pressure fuel shut off valves closed
  • Hydraulics closed
  • Central warning systems update the Cockpit display

Fire bottles are armed

49
Q

Abu’s are self monitoring and designed to do what?

A

Auto shut down

50
Q

If fire is still present after 30 seconds of bottle 1 discharge, what needs to be done?

A

Discharge bottle 2

51
Q

What are the methods of checking the fire bottles are full?

A

Weight of the bottle and pressure of the nitrogen

52
Q

How is a bottle pressure check done?

A

Take readings and check against a pressure-temp graph

53
Q

Are discharge cartridges (squibs) life limited?

A

Yes, calculated from the manufacturers stamp typically 5 years with a max of 10

54
Q

How is it indicated that there is still a fire after bottle discharge?

A

Red light illuminated

55
Q

How are the effects of HIRF on squibs minimised?

A
  • Screen RF sensitive cables
  • HIRF and RADHAZ filters
  • Place sensitive equipment in a faraday cage
  • Ensure bonding of components is within parameters
56
Q

How are the squibs and discharge valves supplied to the maintenance organisation?

A

Disassembled, usually with a swivel nut aswell

57
Q

Wha are the twi types of cargo fire extinguisher discharge systems?

A
  • Dump
  • Metered (Over 180 mins)
58
Q

When are master warning lights and aural alarms prevented?

A

During take off (Not gonna get asked this)

59
Q

When will Halon 1301 be discharged in the lavatory?

A

Solder melts when temp gets to 76C

60
Q

What do the system tests do?

A

Check the continuity and arming

61
Q

What affects the number of portable fire extinguishers in the cabin?

A

Number of passenger seats installed

62
Q

What are the fires that halon 1301 and halon 1211 can and can’t be used on?

A

Can: Class A, B, C
Can’t: Class D

63
Q

Halon is being replaced by what?

A

HFC

64
Q

Where are CO2 extinguishers used?

A

On the ramp to extinguish exterior fires

65
Q

Dry powder extinguishers are used for what?

A

Class A, B, C

66
Q

Water extinguishers are used for what class of fires?

A

Class A

67
Q

What extinguishers are unsuitable for cabins and flight deck use?

A
  • CO2
  • Dry chemical
  • Specialised powder (suitable for ground ops)
68
Q

What are the 3 things that categories a fire zone? (I.e. class A compartment)

A
  • Inflight access
  • Presence of detectors
  • Fire extinguishers available

CAA Module 11 (22 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions