Pressurization

Question 1

How many functions of pressurization are there and name them?

Answer 1

4

Ground function
Pre pressurization
Pressurization in-flight
depressurization

Question 2

What does the pressurization system consist of?

Answer 2

The system consists of:-

two cabin pressure controllers (CPC) 
one residual pressure control unit (RPCU)
 one outflow valve 
one control panel
two safety valves

Question 3

How many motors can control the outflow valve?

Answer 3

3 electric motors . 2 motors are automatic control one motor is for manual control

Question 4

Explain semi automatic operation of the pressurization system?

Answer 4

In normal operation,the system get signals from the FMGS and adjust its opening automatically. However even in the lack of such a signal from the FMGS the flight crew simply need to select the landing elevation,

Question 5

Explain manual operation of the pressurization system

Answer 5

In the manual operation of the pressurization system, the flight crew need to simply control the outflow valve via the manual motor and hence control the cabin altitude manually by operating controls on the pressurization control panel.