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Module 11B > 11.12 - Ice & Rain - 4q > Flashcards

11.12 - Ice & Rain - 4q Flashcards

1
Q

Describe Glaze Ice

A
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2
Q

How would you test the serrated Rod ice detector?

A
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3
Q

What precaution should be taken when testing pitot head heaters?

A
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4
Q

What power setting are probes heated to during flight?

A
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5
Q

How does ice form on the wings?

A
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6
Q

Why does the warning light remain on after the Vibrating rod ice detector has been de-iced?

A
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7
Q

What determines the flow rate of anti-icing fluid?

A
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8
Q

What might cause overheating of the L/E?

A
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9
Q

Chemical de-icing = ?

A
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10
Q

Build up of ice into the airstream, ? method

A
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11
Q

How is probe heating monitored for faults?

A
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12
Q
A
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13
Q

Inflatable boot is made of what material?

A
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14
Q

Anti ice Air comes from where?

A
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15
Q

How is rain repellent spread out?

A
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16
Q

How should you store Rubber boot?

A
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17
Q

In what temp. range should you turn on inlet temp anti-ice?

A
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18
Q

What ice occurs at the following temperature range:
10^C to -3^C

A
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19
Q

What ice occurs at the following temperature range:
0^C to -20^C

A
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20
Q

What ice occurs at the following temperature range:
Below -20^C

A
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21
Q

What type of ice is milky white in appearance?

A
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22
Q

Ice Detection
What frequency does the vibrating rod vibrate at?

A
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23
Q

How is bleed air distributed in a thermal anti ice system?

A
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24
Q

Pneumatic De-Ice
* Pressure operates at?
* Operates when?

A
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25
Q

Water pipe heaters = ?

A
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26
Q

Why is AC power used for anti-ice?

A
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27
Q

Anti-ice fluid = ? (temp/pressure)

A
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28
Q

Pitot head temperature operation is checked how?

A
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29
Q

Thermal anti-icing of leading edges is designed for:
Use on ground
During the flight only
On ground and during the flight

A

During the flight only

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30
Q
A

glaze ice

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31
Q
A

The aircraft must be de-iced before take off using a de-icing fluid

32
Q
A

Screwdriver torque test

33
Q
A

Hot air from the engine bleed air system

34
Q
A

Shall only be switched on for min time required to check serviceability

35
Q
A

All probes are heated with maximum power during flight

(may require double check)

36
Q
A

independent on each side, DC with different currents for speed

37
Q
A

Pressure drop in the detector will result in a flight deck alarm

38
Q
A

supercooled water changing state on contact with the wing

39
Q
A

heated on the ground and in the air 28V and 115V

40
Q
A

rubberised fabric

41
Q
A

no ans needs review

42
Q
A

either engine compressors or a combustion heater

43
Q
A

prior to flight

44
Q
A

haev a build up of ice on the leading edge that causes a warning light to illuminate on the flight deck

45
Q
A

electrical power

46
Q
A

heating the leading edge surfaces

47
Q
A

rotates in one direction

48
Q
A

when rain is on windows and spread by wipers

49
Q

What is meant by Supercooled?

A

Supercooled = water present in liquid form at a temperature below the freezing point of 0^C

50
Q

Where does icing not occur above and why?

A

Icing does not occur above about 40,000 ft

Droplets frozen in form of ice crystals, will not adhere to the aircraft’s surface

51
Q

The serrated rotor on the detector head is continuously driven by the electrical motor so that its periphery rotates within ? of the knife edge cutter

A
52
Q

Describe the operation of the Serrated rotor ice detector?

A
53
Q

Radioactive ice detector system
The detection system operates on the principle that a stream of beta particles is attenuated according to the density or thickness of absorbing medium (air or ice). The trigger threshold corresponds to ?

A

0.4 mm (0.015’’) ice thickness

54
Q

Radioactive ice Detector System
A beta source sends __________ __________ via the ice sensing surface to what?

A

A beta source sends radioactive radiation via the ice sensing surface to a Geiger Mueller tube (GM)

The trigger threshold corresponds to 0.4mm (0.015’’) ice thickness

55
Q

In aerofoil anti-icing, how does the connector provide the required rate of fluid flow through the distributer?
Also what are the strips made of?

A

The connector contains a **metering tube which is accurately calibrated **to provide the required rate of fluid flow through the distributer.

To prevent electrolytic corrosion, plastic sealing strips are interposed between the stainless steel panel and metal used in the aerofoil structure.

56
Q

Wing anti ice systems should not be used where?

A

Wing anti ice systems should not be used on the ground, to prevent wing leading edge overheat, except for short functional tests

57
Q

In a boot section de-icing system. What happens when the system is switched off?

A

The inflation/deflation cycle is repeated when the system is in operation.
When the system is switched off, vacuum is continuously supplied to all inflation tubes within the de icer boot sections to hold them flat against the wing and tail unit leading edges, minimising aerodynamic drag.

58
Q

Pneumatic de-ice boots
How do the tubes run and how is static electricity dealt with?

A

The tubes either run parallel to the span, or as in other arrangements, parallel to the chord.

The external surfaces of the de-icer boots are** coated with a film of conductive material** to discharge any accumulations of static electricity

59
Q

To assist ice shedding action and deflation, what is done?

A

To assist the ice shedding action and deflation, de-icer boots are secured under tension

60
Q

When installing de-icer boots that are Cemented. What are the drying times for the following conditions of temperature and humidity:
* Min 1 Hour drying time allowed
* Min 2 hour drying time allowed

A
  • 15^C or above and RH of 75% = Min 1 hour drying time
  • RH between 75% and 90% = Min 2 hour drying time
61
Q
A
62
Q

Pnuematic de icer boots
What should not be allowed to dry on?

A

Petrol should not be allowed to dry on; it should be wiped off immediately with a clean cloth

63
Q
A
64
Q

What might be the cause if a de-icer boot section inflates and deflates slugglishly?
(even though the correct pressure is indicated)

A

it may be the result of an obstruction in certain pipelines

If the distributor valves are electrically controlled type, sluggish inflation and deflation may also be due to sticking solenoids

65
Q

How are engine anti-ice systems controlled?

A

Engine anti-ice systems are manually controlled by the flight crew

66
Q

In flight, when should the Engine anti-ice system be turned on?

A

before entering areas of visible moisture (rain or clouds) when the inlet temperature is between 10^C and -15^C

67
Q

Engine Anti Ice Valves
Normally ? actuated and controlled to close by ?

Shutoff valves are normally actuated by ?

A

Pressure regulating valves are normally pneumatic actuated and controlled to close by an electrical solenoid

Shutoff valves are normally actuated by an electrical AC or DC motor

68
Q

Name 2 functions of the Electrical Windscreen anti icing system

A
  • Prevent, not only the formation of ice and mist
  • Also to improve the impact resistance of the windscreen at low temperatures
69
Q

For Electrical Windscreen anti icing system, what is the function of the controlling device?

A

Maintain a constant temperature of the windscreen and also to prevent overheating of the vinyl interlayer which would cause such permanent damage as vinyl ‘bubbling’ and discolouration.

70
Q

In a typical anti-icing Electrical Windscreen system, the controlling device is connected to how many temperature sensors?

A

the controlling device is connected to two temperature sensing elements laminated into the windscreen

71
Q

In a typical anti-icing Electrical Windscreen system, what happens in the event of failure of the controller?

A

In the event of a failure of the controller, the glass temperature will rise until the setting of the overheat sensing element is attained. At this setting an overheat control circuit cuts off the heating power supply and illuminates a warning light

72
Q

Electrical Anti-icing Windscreen System
In addition to the normal temperature control circuit, it is usual to incorporate a circuit which supplies more heating power under severe icing conditions when heat losses are high.
How is this done?

A

When the high-power setting is selected, the supply is switched to higher voltage output tapping’s of an auto transformer

73
Q

Electrical Windscreen Anti icing system
Is the power supplied the same for ground testing purposes as in the air?

A
74
Q

Electrical Windscreen anti icing system
When testing and performing a checking of insulation resistance between circuits on ‘normal’, ‘low’ and ‘high’ settings, how should thermal shock stresses be minimised?

A

Electrical power should be applied initially at low intensity and windscreen allowed to warm up gradually thus minimising the effects of thermal shock stresses

75
Q

How should Windshield wipers be operated for maintenance purposes?

A

Flush the windshield with water operate the wipers while the glass is wet to avoid scratching the glass

76
Q

What is D-Limoneneis liquid?

A

colourless liquid or oil with citrus odor

Module 11B (42 decks)

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