PNEUMATICS

Question 1

1. What are the sources of bleed air?

Answer 1

APU
Ground Air
Engines

Question 2

2. What is bleed air used for?

Answer 2

Anti-ice
Water Pressurization
Engine Start
HYD Pressurization
Air cond
Aspirated TAT probe (if installed)

Question 3

3. What is indicated by an illuminated DUAL BLEED light?

Answer 3

APU bleed open with #1 eng bleed open
or
APU bleed open with #2 eng bleed open and isolation valve open

Question 4

4. What would cause an Engine Bleed tripoff?

Answer 4

Excessive pressure or temperature

Question 5

5. How does the Isolation Valve work in AUTO?

Answer 5

Valve is closed when all engine bleeds and pack switches are on

Question 6

6. What would cause a L WING BODY OVERHEAT light to illuminate?

Answer 6

Duct leak left side

Air Conditioning Bay
Wing Leading Edge
Eng Strut

(Keel beam or APU duct)

Question 7

7. What would case a R WING BODY OVERHEAT light to illuminate?

Answer 7

Duct leak on right side

Question 8

8. Can a BLEED TRIP OFF be reset?

Answer 8

Yes

Question 9

9. Can a WING BODY OVERHEAT be reset?

Answer 9

No