Airframes icing protection

Question 1

How does icing affect the weight of an aircraft?

Answer 1

icing increases the weight of the aircraft and affects the center of gravity, usually moving it aft

Question 2

What are the icing affects on lift?

Answer 2

Increased weight requires more lift and can affect the aerodynamic performance in general. also hinders the controllability of the aircraft

Question 3

How does icing affect drag?

Answer 3

Ice on the skin of a plane will increase skin friction therefore creating more drag.

Question 4

How does icing affect thrust?

Answer 4

Propeller aerodynamic efficiency is affected the same way the wing is. Ice on the props means more weight and requires more power to turn

Question 5

What is the difference between anti-icing and de-icing?

Answer 5

Anti-icing prevents the formation of ice. De-icing is the removal of ice that has already formed

Question 6

What are three methods of removing ice?

Answer 6

Mechanical, thermal and chemical

Question 7

What are some examples of mechanical ice removal?

Answer 7

Physically removing ice build up such as scraping ice off surfaces. The use of de-icing boots or ice doors (on a kingair only)

Question 8

What are some examples of thermal ice removal?

Answer 8

Applying heat for anti-icing or de-icing. This can be done with the use of electrical, carb or bleed air or the use of a hermann nelson heater on ground

Question 9

What are some examples of chemical ice removal?

Answer 9

Spraying anti-icing/de-icing chemicals in flight that weep from leading edges and empennage. Can also be done on ground with de-icing fluids

Question 10

What are some examples of airframe ice protection?

Answer 10

Engine air intakes
Propellers
antennas
sensors-pitot tubes
Wings and tails
Windows
Brakes
Carburetors

Question 11

Pneumatic boots use ____________ ____ in a rubber boot to remove ice after it forms which is then removed by the airflow

Answer 11

Pressurized air

Question 12

What kinds of heat can thermal ice protection use?

Answer 12

Electrical, bleed or carb heat

Question 13

Windscreen thermal ice protection systems may be used all the time because

Answer 13

Windows remain warm and pliable and are resistant to breaking easily in an event of an impact such as a birds trike

Question 14

Propellers use either _________________ ___________ or ____________ _________ to remove
ice in-flight

Answer 14

Electrical boots anti/de-icing fluid

Question 15

Many aircraft operators use window heat for a small portion of the flight. T/F?

Answer 15

False. They use them throughout the duration of the flight

Question 16

Piston engine use ice protection to prevent _____________ icing and/or _________ _______icing

Answer 16

Carburetor or air filter icing

Question 17

Aircraft heating system is used to heat the carburetor air, just to prevent ice build up, T/F?

Answer 17

False, also to remove ice build up too

Question 18

Alternate unfiltered air source can be selected (for example, carb heat). T/F?

Answer 18

True

Question 19

How is turbine engine inlet icing combated?

Answer 19

By removing it or preventing it via thermal (bleed air or electrical) or de-ice boots

Question 20

How is EPR (engine pressure ratio) icing combated?

Answer 20

Thermally, by bleed air for the most part

Question 21

How is ice in turbine engine fuel combated?

Answer 21

Thermally with the use of fuel heaters/oil heat exchangers or additives (such as prist)

Question 22

How does ice protection work on a propeller?

Answer 22

Thermally or chemically, thermally by electrical boots while chemicals are transferred through a slinger ring

Question 23

Rain protection may be done using ___________ ___________, ____________ ____________ or
____________ ____________

Answer 23

Rain repellant, bleed air, or simple rain wipers

Question 24

You can test windshield wipers and rain repellant on a dry windshields, T/F?

Answer 24

False, rain repellants on dry windshields will cause safety and visibility issues