Environmental control

Question 1

Human requirements

Answer 1

positive air pressure oxygen inhalation rate 1.47Lt’s/min temperature: maintain body above 35 degrees

Question 2

System design influences

Answer 2

cost power availability passenger count size/volume of fuselage

Question 3

Basic principle of cabin conditioning system

Answer 3

Question 4

Temperature control system

Answer 4

Question 5

How can engine efficiency be improved by reducing engine bleed and maintaining oxygen levels in the cabin

Answer 5

recycle cabin air up to 50% allowed uses HEPA filters

Question 6

Typical main conditioning pack equipment

Answer 6

heat exchanger air cycle machine

Question 7

B787 cabin conditoning

Answer 7

max cabin altitude 6000ft better humidity levels (15%-20%) both due to composite use in fuselage cabin conditioning comes from electrically driven compressors to reduce engine bleed

Question 8

Pressurisation

Answer 8

human needs structural loading economics

Question 9

Cabin altitude

Answer 9

the air pressure felt inside the cabin when the aircraft is flying limited to 8000ft compromise between human requirements and structural loading

Question 10

Emergency oxygen

Answer 10

normally masks are automatically deployed if cabin altitude exceeds 10,000ft