Replace Vacuum Or Pressure System Pump

Question 1

What two types of pumps are used in the low-pressure pneumatic system?

Answer 1

A dry-type and a wet-type air pump

Question 2

What are the vanes of a wet-type air pump made of?

Answer 2

Steel

Question 3

What are the vanes of a dry-type air pump made of?

Answer 3

Carbon

Question 4

How are the vanes of a wet type air pump lubricated?

Answer 4

With engine oil directed into the pump through a small hole in the base of the pump

Question 5

Why is it important to use the correct gasket when replacing a wet-type air pump?

Answer 5

The gasket must have a hole through which the pump lubricating oil can flow

Question 6

Why do dry-type air pumps not need to be lubricated?

Answer 6

The special carbon material of which the vanes are made wears away in microscopic amounts to provide the needed lubrication

Question 7

What must be done to the gyro pressure system if a dry-type air pump fails?

Answer 7

All of the filters must be replaced to prevent any debris from the pump vanes getting into the gyro instruments