Pneumatics

Question 1

Engine and APU bleed air are the only air sources for the pneumatic system on the ground.

Answer 1

“False”

Question 2

The engine bleeds, air conditioning ducts, APU bleed air distribution, and anti-ice supply have two overheat and detection loops. With both loops operational, both loops must detect an overheat condition before an EICAS message is displayed. T/F

Answer 2

“True”

Question 3

What does the Overheat Detection System (ODS) observe?

Answer 3

Overheat and leak detection for: Engine bleed; APU bleed; air conditioning; Anti-ice supply ducting

Question 4

How many bleed valves does each engine have?

Answer 4

2

Question 5

What is the APU bleed air used for?

Answer 5

ECS on ground; ECS up to 15,000 feet; engine start on ground; engine start up to 21,000 feet

Question 6

Where is the external ground air source panel located?

Answer 6

Lower fairing between the wings

Question 7

Where is bleed air tapped from the engine?

Answer 7

6th and 10th stage compressors

Question 8

External pneumatic air provides:

Answer 8

Air conditioning and engine starting on ground

Question 9

What provides air for the AMS (Air Management System)?

Answer 9

Engine and APU bleeds; external air source

Question 10

Air from the pneumatic system provides:

Answer 10

ECS; Engine and wing anti-ice; Engine start; Water pressurization

Question 11

Can the APU bleed be used for the anti-ice system?

Answer 11

No

Question 12

What happens when the XBLEED button on the panel is pushed out?

Answer 12

Crossbleed is closed

Question 13

Where is external air for an air start connected?

Answer 13

Lower fairing between the wings

Question 14

Will the crew have any indication when external air for an air start is connected?

Answer 14

Yes, from duct pressure on MFD status page or possibly ground cart showing on MFD ECS synoptic page