SY1117 ECS/ Pressurization

Question 1

How does the cabin temperature rheostat function?

Answer 1

With toggle switch in AUTO, the rheostat electrically (AC) moves the temperature control valve, which controls how much air passes through the heat exchanger

Question 2

How does the cabin air temperature toggle switch function?

Answer 2

Spring-loaded to off. Depressing the switch either direction manually moves the temperature control valve

Question 3

How long does it take the temp control valve to move from full cold to full hot?

Answer 3

About 6 seconds

Question 4

What does the pneumatic defog control do?

Answer 4

Governs only volume of airflow

Question 5

What temperature does the defog system try to maintain?

Answer 5

200°F

Question 6

What happens if defog air gets above 200°F?

Answer 6

Temp control valve closes and heat exchanger air enters the system until below 200°

Question 7

What is the backup temp sensor’s limit and what does it do?

Answer 7

280°F/shuts off all airflow

Question 8

If the cabin pressure switch is set to RAM DUMP, what two pneumatic systems are still powered?

Answer 8

Hydrualic reservoir and engine anti-ice

Question 9

What happens to the pneumatic system in the event of an AC power failure?

Answer 9

All valves and temp setting remain as preset

Question 10

What are some corrective procedures if the temperature rheostat malfunctions?

Answer 10

Try the manual hot/cold switch. If that doesn’t work, select RAM DUMP. If that doesn’t work poke a hole in or jettison the canopy

Question 11

What are indications of an air cooling turbine failure?

Answer 11

Loud bang or rumbling vibration accompanied by smoke/fumes from AC outlets

Question 12

What are corrective procedures for a air cooling turbine failure?

Answer 12

Select RAM DUMP below FL250 and reduce airspeed

Question 13

What is meant by “blowing out” the defog system?

Answer 13

Turning defog to full and temp to full hot

Question 14

What does “blowing out” the defog system do?

Answer 14

Clears the moisture separator precluding fogging up at level off

Question 15

What is the corrective action if canopies do fog up?

Answer 15

Defog full and AC full cold

Question 16

What causes duct howl?

Answer 16

Front cockpit outlet open while rear is closed or partially closed

Question 17

Corrective action for duct howl?

Answer 17

Close front cockpit duct slightly or slight open rear cockpit duct

Question 18

What does a coalescer bag malfunction look like?

Answer 18

Whitish smoke enters cockpit from behind the rear seat when blowing out the system

Question 19

Can you continue the mission with a coalescer bag malfunction?

Answer 19

Yes, but write it up when you get on the ground