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review for quiz 1 Flashcards

1
Q

2 Subsytems

A
  1. Fire/Overheat Detection & Warning
  2. Fire Extinguishing
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2
Q

3 Types of Fire/Overheat Detection & Warning

A
  1. Unit Spot Type
  2. Continuous Loop/ Firewire
  3. Smoke Detection
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3
Q

2 Types of Fire Warning

A
  1. Bell
  2. Light Indicator
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4
Q

2 Types of Continuous Loop

A
  1. Dual Loop
  2. Pressure Type
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5
Q

3 Fire Zones

A
  1. Fireproof Bulkheads
  2. Engine Fire Prevention
  3. Cockpit & Cabin Interiors
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6
Q

4 Types of Smoke Detectors

A
  1. Carbon Monoxide Detector
  2. Photoelectric Detector
  3. Ionisation Type
  4. Flame Detector
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7
Q

is the most dangerous threat to the safety of an a/c.

A

Fire

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8
Q

Fire Protection System will include as many as possible of the ff. features:

A

•Rapid warning of fire/overheat & its accurate location
•Must not cause false warnings
•Continuous warning for duration of fire/overheat
•Confirmation that the fire has been extinguishing
•Indication that the fire has re-ignited
•A means of testing the system from the flight deck
•Detectors that arw proof against oil, water, vibration & high temp.
•Detectors that are easily accesible throughout the a/c
•Detectors & extinguishers hot wired electrically or powered from emer. electrical buses
•Aduquate visual & aural indication on the flight deck & vital areas on the a/c
•Separate warnings for each engine & specific areas as determined by the a/c manufacturers

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9
Q

are used mainly to detect high temp. leaks from bleed air ducts amd normally positioned at pipe connections.

A

Unit Spot Type / Spot Detectors

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10
Q

This type is fitted at various strategic pts w/in the fire/overheat zone and takes the form of a thermally activated switch.

A

Unit Spot Type/ Spot Detector

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11
Q

They are electrically connected in parallel with each other and in series with the audio/visual warning system.

A

Unit Spot Type/ Spot Detector

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12
Q

This arrangent allows any switch to operate the warning, even if other switches have failed in the remainder of the system.

A

Unit Spot Type/ Spot Detector

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13
Q

This method permits more complete coverage of a fire hazard area than any type of spot-type of temperature detectors.

A

Continuous Loop (Fire Wire) Detectors

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14
Q

The continuous loop uses the principle of capacitance and resistance to indicate a rise in temperature at any point along the length of the detector loop.

A

Continuous Loop (Fire Wire) Detectors

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15
Q

The commonest type has a stainless steel or Inconel outer tube, an inner pure nickel wire surrounded by ceramic beads wetted by eutectic salt.

A

Continuous Loop (Fire Wire) Detectors

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16
Q

The effect of this design is that a rise in temperature causes a sharp fall in electrical resistance, as well as a rise in capacitance.

A

Continuous Loop (Fire Wire) Detectors

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17
Q

Most aircraft use the dual loop system of indication.

A

Dual Loop System

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18
Q

e Each sensing circuit has dual sensing loops.

Each Loop A and Loop B is independent of each other.

A

Dual Loop System

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19
Q

When the loop selector switch is set to BOTH, both loops must detect a fire condition before the warning system is activated.

A

Dual Loop System

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20
Q

If only onc loop detects a fire, the associated loop fault light will illuminate. If the selector is switched to a single loop (A or B) full fire warnings will activate if the selected loop senses a fire condition.

A

Dual Loop System

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21
Q

Pressing the loop test button simulates a fire condition on the respective loop.

A

Dual Loop System

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22
Q

This is done by earthing the inner electrode of the loop that functionally checks the system and checks the continuity of the loop.

A

Dual Loop System

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23
Q

The pressure type detection system uses a continuous loop for the detection element.

A

Pressure-Type Sensor

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23
Q

This loop is made from sealed stainless steel tube that contains an element that absorbs gas when it is cold but releases the gas when it is heated,

A

Pressure-Type Sensor

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24
Q

This tube is connected to a pressure switch that will close when the -pressure reaches a pre-determined level.

A

Pressure-Type Sensor

25
Q

The commonest make of this type of system is the Systron-Donner system which uses a centre titanium centre wire and the expansion of both helium and hydrogen gas to give the two-stage warnings.

A

Pressure-Type Sensor

26
Q

These prevent fire from spreading to other areas. Auxiliary power units and tail mounted engines are normally contained within such bulkhead compartments separating them from the rest of the airframe.

A

Fireproof Bulkheads

27
Q

The (?) also contain a firewall to separate the — engine from the wing.

A

engine pylons

28
Q

These are made from titanium br stainless steel and all joints are sealed with fireproof sealants.

A

Fireproof Bulkheads

29
Q

There area number of techniques used to help prevent a fire occurring around engines. These are, the use of flameproof or flame resistant materials, use of bonding strips to prevent arcing, drainage of spilt fuel/oil and efficient cooling.

A

Engine Fire Prevention

30
Q

All pipes which carry fuel, oil or hydraulic fluids are made (?) and all electrical components and connections are made (?).

A
  1. fire resistant
  2. flame proof
31
Q

It is essential that a fire staring in any zone is contained within that zone and is not allowed to spread to any other part of the aircraft.

A

Fireproof Bulkheads

32
Q

The engine cowlings form a natural container but they are usually made from (?) and would not contain a ground fire for long.

A

light alloy

33
Q

In flight however (?) through the cowlings, provide sufficient cooling to render the cowlings fireproof.

A

cooling airflow’s

34
Q

The fireproof bulkheads and any cowling’ that has no cooling airflow are
usually made from (?).

A

titanium or stainless steel

35
Q

All wool, cotton and synthetic fabrics used in interior trim are treated to render them flame resistant.

A

Cockpit and Cabin Interiors

36
Q

(?) conducted have shown that whilst the foam used in seat cushions is flammable, if covered with a flame-resistant fabric, there is little danger of fire from accidental contact with a cigarette, for example.

A

Tests

37
Q

Fire protection for the aircraft interior is usually provided by (?).

A

hand-held extinguishers

38
Q

Various types extinguishers are available including, (?). Each type is best used on one kind of fire but may be used on other kinds.

A

Water, CO, and Dry Powder

39
Q

On light aircraft, the only Protection against fire is a (?), dividing the engine bay from the cabin and the rest of the aircraft.

A

stainless steel or titanium bulkhead (firewall)

40
Q

Larger aircraft have the complete (?) isolated from the airframe/wing assemblies and. in addition, aircraft cowlings can be divided into a number of ‘fire zones’, each one usually having its own warning and extinguishing system.

A

engine cowlings

41
Q

The example has four zones around the engine that only (?) have firewires and extinguishing.

A

two

42
Q

Engines are usually split into (?).

A

Hot And Cool Zones

43
Q

The hot zone comprises the (?).

A

combustion chamber, turbines and exhaust areas

44
Q

the cool zone comprises the (?).

A

intake, compressors and accessory drives

45
Q

A (?) monitors certain areas of the aircraft for the presence of smoke, which is could be indicative of a fire condition.

A

SMOKE DETECTION/ DETECTORS

46
Q

These may include cargo and baggage compartments and the toilets of transport category aircraft.

A

SMOKE DETECTION/ DETECTORS

47
Q

A (?) is used where the type of fire anticipated is expected to generate a substantial amount of smoke before temperature changes are sufficient to actuate a heat/fire detection system.

A

SMOKE DETECTION/ DETECTORS

48
Q

The presence of (?), is dangerous to flight crew and passengers alike and may indicate a fire condition as it is a by-product of combustion.

A

Carbon Monoxide (CO), or Nitrous Oxides (N,O)

49
Q

Detection of the presence of either or both of these gases could be the earliest warning of a possible dangerous situation.

A

Carbon Monoxide Detector

50
Q

is very dangerous, firstly due to the minute amount required to cause loss of attention and headaches; (this is approximately 2 parts in 10,000). It is colourless, ocdlourless, tasteless and a non-irritant.

A

Carbon Monoxide

51
Q

The detector is usually a (?) with a transparent pocket containing (?) that have been treated with a chemical, which changes colour to green or black when they are exposed to carbon monoxide.

A

small card
silica fel crystals

52
Q

(?) are usually used in cabin and cockpit areas.

A

Carbon Monoxide detectors

53
Q

Air from the monitored compartment is drawn through the detector chamber and a light beam is shone on it.

A

Photoelectric Smoke Detectors

54
Q

A photoelectric cell installed in the chamber senses the (?) that is refracted by the smoke particles.

A

light

55
Q

The photocell is installed in a (?) that measures any changes, in the amount of current that it‘ conducts.

A

bridge circuit

56
Q

A small amount of radioactive material is mounted on the side of the detector chamber.

A

Ionisation Type Smoke Detector

57
Q

This material bombards the oxygen and nitrogen molecules in the air flowing through the chamber and ionises it to the extent that a reference current can flow across the chamber through the ionised gas to an external circuit.

A

Ionisation Type Smoke Detector

58
Q

Smoke flowing through the chamber changes the level of ionisation and decreases the current. When the current reduces to a specific level the external circuit initiates a smoke
warning signal.

A

Ionisation Type Smoke Detector

59
Q

This system uses a photoelectric cell to detect a sharp rise in light, such as that from a flame in a closed bay.

A

Flame Detectors

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