Cabin Pressurization

Question 1

What are the pressurized areas of the aircraft?

Answer 1

1. Cockpit
2. Avionics bay
3. Cabin
4. Cargo compartments

Question 2

How is air supplied into the cabin?

Answer 2

Air is supplied to the pressurized areas via the air conditioning packs

Question 3

What is an outflow valve?

Answer 3

An outflow valve (controlled by 2 Cabin Pressure Controllers or CPC 1&2) is used to regulate the outgoing air

Question 4

What does CPC stand for? How many are they?

Answer 4

Cabin Pressure Controller

There are 2

Question 5

Do both CPC system work at the same time?

Answer 5

No. Only one CPC system operates at a time, the other as back up

Question 6

How is the Safety Valve controlled and what is it used for?

Answer 6

1. Fully automatic

2. To avoid excessive cabin Differential Pressure

Question 7

What is Delta P on ECAM

Answer 7

The difference between outside and inside the aircraft pressure. As the outflow valve closes and we fly higher, Delta P increases. Cabin Altitude, decreases.

As the outflow valve is opened, Delta P decreases but the Cabin Altitude will increase

Question 8

The relationship of V/S FT/MN and Cabin Altitude?

Answer 8

As the outflow valve closes, the altitude decreases, V/S FT/MIN will show a negative vertical speed, ex. -600.

As the outflow valve is opened, the cabin altitude will rise, V/S FT/MIN will show a positive vertical speed. Ex. 700

Question 9

When does the V/S Ft/min start to blink?

Answer 9

Pulses at V/S > 1,750 ft/mn and resets at 1,650 ft/mn

Question 10

Where can the crew monitor the cabin pressure system?

Answer 10

1. ECAM CAB PRESS page 2. Cruise page.

3. V/S is displayed on the Door page and only when airborne.

Question 11

On the ground, the outflow valve should be fully closed or open?

Answer 11

Open with the cabin fully depressurized