Chapter 20 - The Cooling System

Question 1

What are the negative effects of too high engine temperature?

Answer 1

• Reduction in efficiency
• Incorrect combustion
• Can cause detonation
• Can weaken engine components
• Reduction in engine life

Question 2

What can be fitted to engine parts (e.g cylinders) to enhance cooling?

Answer 2

Cooling fins

Question 3

How do cooling fins enhance cooling?

Answer 3

Increase the surface area allowing more heat to escape

Question 4

What are the two main types of cooling system fitted to aircraft

Answer 4

• Air-cooling

- Liquid-cooling

Question 5

What are cowl flaps?

Answer 5

Mechanisms fitted to allow an increase in airflow through the engine bay

Question 6

What are the two main types of cowl flaps?

Answer 6

Fixed and variable

Question 7

Which cockpit instrument should be used to determine whether or not cowl flaps should be open or closed (variable type)?

Answer 7

The cylinder head temperature (CHT) gauge