11.4 Air Conditioning

Question 1

What is a pressure regulator known as?

Answer 1

Bleed valve

Question 2

What regulates the pressurisation of the cabin?

Answer 2

Outflow valve

Question 3

Which supply sources are used to supply the AC system?

Answer 3

APU, Engines and a ground powered air supply

Question 4

What is the role of the pneumatic controller?

Answer 4

Monitor pressure and temperature, to register leaks and to monitor the operation of the pneumatic components

Question 5

How does a vapour- cycle machine cool the pneumatic flow?

Answer 5

A special cooling fluid is compressed and expanded in a closed circuit

Question 6

The recirculation system…..?

Answer 6

Recirculates cabin air to reduce the pack airflow

Question 7

In an ideal situation, what is the best condition for the aircraft structure with regards to pressurisation?

Answer 7

The best condition for the aircraft structure would be no pressurisation during flight

Question 8

Why would an OUTFLOW valve have 2 AC motors and 1 DC motor?

Answer 8

Each pressure controller can control its own AC motor and if AC is not available the DC motor can control the valve

Question 9

What two conditions can cause an equipment cooling system override operation to happen?

Answer 9

• component faliure
• smoke detected

Question 10

What will happen is cabin altitude reaches 15,000ft?

Answer 10

Outflow valves automatically close