PNEUMATIC SYSTEM

Question 1

With engines and APU running and APU bleed valve selected ON, select the correct
statement:

a. Engine bleed valves open, X bleed valve opens, APU bleed valve closes
b. Engine bleed valves close, X bleed valve opens, APU bleed valve opens
c. Engine bleed valves open, X bleed valve closes, APU bleed valve opens
d. Engine bleed valves close, X bleed valve closes, APU bleed valve opens

Answer 1

b. Engine bleed valves close, X bleed valve opens, APU bleed valve opens

Question 2

To provide external air for ENG start the following switching is required:

a. Pneumatic X-bleed AUTO
b. Pneumatic X-bleed OPEN
c. Engine bleed switches OFF
d. APU bleed switch OFF

Answer 2

b. Pneumatic X-bleed OPEN

Question 3

Air bleed from the engines is:

a. not cooled prior to being used by the systems
b. cooled in a heat exchanger by cooling air bleed from fan section
c. cooled using ambient air
d. only cooled in air conditioning part

Answer 3

b. cooled in a heat exchanger by cooling air bleed from fan section

Question 4

High pressure air is supplied from:

a. Engine 1 and 2 bleed systems, APU load compressor, HP ground connection
b. Engine 1 and 2 bleed systems
c. Engine 1 and 2 bleed systems and APU load compressor

Answer 4

a. Engine 1 and 2 bleed systems, APU load compressor, HP ground connection

Question 5

Pneumatic system operation is controlled and monitored by:

a. one bleed monitoring computer
b. two bleed valve computers
c. two bleed monitoring computers

Answer 5

c. two bleed monitoring computers

Question 6

Which source operates the bleed valve?

a. Pneumatic
b. Electric
c. Both

Answer 6

a. Pneumatic

Question 7

What happens when pressure and temperature are not sufficient to supply the
corresponding engine bleed valve:

a. IP valve closed
b. HP valve opened, IP stage closed
c. HP valve opened, IP stage remains in the same configuration

Answer 7

c. HP valve opened, IP stage remains in the same configuration

Question 8

Can you control the HP valve position through the air bleed cockpit panel?

a. Yes
b. No

Answer 8

b. No

Question 9

If the bleed valve closes, the HP valve:

a. opens automatically
b. closes automatically

Answer 9

b. closes automatically

Question 10

Temperature regulation is achieved by the precooler which regulates and limits the
temperature at:

a. 150ºC
b. 85ºC
c. 200ºC

Answer 10

c. 200ºC

Question 11

Which source controls the crossbleed valve:

a. Pneumatic
b. Electric

Answer 11

b. Electric

Question 12

Cross-bleed valve is provided with 2 electrical motors:

a. one for the automatic mode, the other one for the manual mode
b. two for the automatic mode
c. two for the manual mode

Answer 12

a. one for the automatic mode, the other one for the manual mode

Question 13

In case of low upstream pressure, the high pressure valve (HP valve) is:

a. pneumatically closed
b. open
c. electrically opened
d. electrically closed

Answer 13

a. pneumatically closed