Propeller Ice Protection

Question 1

What 3 areas of the propeller are most at risk of ice build up?

Answer 1

Blades, spinner and engine air intake

Question 2

What are the 2 main types of ice protection?

Answer 2

Fluid anti icing system and electrical de icing system

Question 3

What type of aircraft is fluid anti icing most used? What type of aircraft can it not be used on and why?

Answer 3

Piston a/c. Turboprop - can contaminate compressor blades

Question 4

How is electrical power supplied from the a/c system for electrical de-icing?

Answer 4

Transferred from engine by spring loaded carbon brushes rubbing against copper slip rings

Question 5

What contains the electrical elements for electrical de icing? Where is it bonded?

Answer 5

Heating boots/mats. Inner 1/3 of each propeller blade.

Question 6

When is the propeller de icing system used to prevent overheating?

Answer 6

Propellers are rotating and short periods of time before take off

Question 7

Why is cyclic heating used? What does it prevent?

Answer 7

Lessons load on a/c electrical system. Run back

Question 8

How long do electrical de icing heating elements remain energised? What cycles?

Answer 8

15 to 30 secs. 2 to 6 min cycles

Question 9

When is a fast cycle used? What temp range?

Answer 9

2 mins. +10 to -6 degrees

Question 10

When is a slow cycle used? What temp range?

Answer 10

6 mins. Below -6 degrees