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EGK Systems > Anti Icing > Flashcards

Anti Icing Flashcards

1
Q

De Icing

A

Removing Ice
Before flight or in flight

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2
Q

Anti Icing

A

Preventing ice from forming on and building on critical areas of airframe and engine

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3
Q

De icing and anti icing systems examples

A

Hot bleed air
Hot engine oil
Electrically heated mats
Pneumatically operated mat
Fluid de icing

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4
Q

Pneumatic system is a (anti ice)

A

De icing system

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5
Q

Thermal Anti Icing

A

Bleed air via duct work along leading edge/nacelle/windows and tail

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6
Q

Hot Rod

A

Detects icing - probe near cockpit window that is a visual indicator of icing conditions

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7
Q

Vibrating Rod

A

Probe mounted outside of fueslage Ona. Vibrator housing which vibrates the probe

Ice builds up frequency falls and ice warning given

40khz

Ice detection system

6 seconds heater switch - icing cycles restarts

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8
Q

Pressure Sensor

A

Hollow tube attached to aircraft

Pressure builds up in probe via hole in LE/TE

In ice condition leading edge holes becomes blocked by ice and negative pressure is created in the hollow tube

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9
Q

Moden System - Ice Detector

A

Reference loop - fixed voltage applied

Detector loop - higher voltages applied

Difference between the voltage of the two loops triggers warning on flight deck

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10
Q

Fluid Based ice protection

A

Fluid pumped from reservoir into perforated strip

Spread back to melt ice

Sequence is controller by a timer

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11
Q

Thermal Ice Protection

A

Bleed air or electrically heated mats
Anti ice system

LE slats/LE wing

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12
Q

Disadvantage of thermal ice protection

A

Performance penalty may have to be switched of during take off and in critical phases of flight

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13
Q

Jet Engine Anti Icing

A

Internal and use hot engine oil and internal engine air to heat fan and nose cone area of engine

No control over internal de icing system

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14
Q

How is engine nacelle heated by bleed air

A

Piccolo tube

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15
Q

Turboprop ice protection

A

Usually electrically heated mats

Heating elements of resistance wire or sprayed metal to air intake structure

Mats switched on and off in sequence to reduce loads

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16
Q

Ice deflector doors

A

Allow ice to be directed out to atmosphere than rather being drawn into engine

17
Q

Where is ice more likely on turboprop

A

At the blade

18
Q

Turboprops with odd number of blades are

A

Heated continuously

19
Q

Pneumatic Boot System

A

A de icing system
Certain amount of ice is allowed to form then boot is inflated
Boots are then deflated
Used on piston engine

Only inflate for a few seconds

20
Q

Ice requirements for a pneumatic boot system

A

Ice thickness of between 0.5cm and 1.5cm

21
Q

Components on aircraft that require ice protection

A

Wing leading edge
Windscreens
Pitot static probes
Engine intakes
Propellers

22
Q

Windscreen ice protection req

A

Front windscreen is electrically heated
Must be serviceable otherwise cannot fly

Used to reinforce the structural strength

23
Q

Ice detector system purpose

A

Used to detect build up of ice and signal to flight deck

Does not automatically activate

24
Q

Windscreen are heated to what

A

Controlled to heat at 35 degrees

25
Q

Rain repellent system

A

Toxic so caution
Used with conjunction with wipers
Can obscure for 15 seconds after being applied

26
Q

Rose mount Ice detector

A

Probe mounted on vibrator house which vibrates at 40hz when no icing when ice accumulates frequency decreases which indicates a light warning in the cockpit

27
Q

Ice detection - Advisory

A

Crew activate ice protection based on flight manual

28
Q

Primary Ice detection system

A

Automatically activates ice protection systems at optimal moment.

29
Q

Windshield ice control

A

Electrically heated via small wires in panel. AC current to produce heat

30
Q

Differential Pressure Ice detector

A

Hollow tubes on LE and TE detector monitors pressure difference between the two. In icing condition hollow tubes become blocked by ice causing pressure difference. Heater element around heats up holes causing indications to turn off

31
Q

Hot Rod Detector

A

Unit mounted outside cockpit window ice builds up on leading edge of probe

Can be decided to observe icing conditions

32
Q

Hydrophobic seal coatings

A

Ensures rain beads up and falls of naturally providing pilot with enhanced visibility in wet conditions. Added by manufacturer

Last longer than chemical

33
Q

How does rain repellent coating work on windscreen?

A

The water forms beads which roll of the screen
Forms large water droplets to fall off naturally
Is not applied to dry window screen though

34
Q

Large transport airplanes use what to anti ice

A

A hot air thermal system
Bleeding air from the later stages of compressor

EGK Systems (15 decks)

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