15.12 air systems

Question 1

what is an acceptable temperature range for engine internal temps

Answer 1

800c-1150c

Question 2

which is the hottest section of engine

Answer 2

around turbines

Question 3

what is zone 1 in engine

Answer 3

area around fan case that contains accessory case and eec

Question 4

how is zone 1 vented

Answer 4

ram air

Question 5

how is zone 2 cooled

Answer 5

fan air from upper part of fan duct

Question 6

what is zone 3

Answer 6

area around high pressure compressir

Question 7

how is zone 3 cooled

Answer 7

cooling air

Question 8

at what temp can ice form

Answer 8

up to 5c

Question 9

during flight, are anti ice systems automatically controlled

Answer 9

yes, automatically controlled by a switch on the flight deck

Question 10

what are the temps at the rear stages of compressor

Answer 10

350c-400c

Question 11

how is compressor cooled

Answer 11

cooling air from intermediate compressor stage

Question 12

what is the most common method to cool components in turbine section

Answer 12

bleed air

Question 13

how are nozzle guide vanes cooled

Answer 13

compressor air

Question 14

how are enginne bearing chambers sealed

Answer 14

lp compressor bleed air

Question 15

where is air often bled from in the compressor

Answer 15

from the final or highest pressure stage

Question 16

what is one function of secondary air passing through engine

Answer 16

helps to cool the combustion chamber liners