SY1117 ECS/ Pressurization Flashcards
How does the cabin temperature rheostat function?
With toggle switch in AUTO, the rheostat electrically (AC) moves the temperature control valve, which controls how much air passes through the heat exchanger
How does the cabin air temperature toggle switch function?
Spring-loaded to off. Depressing the switch either direction manually moves the temperature control valve
How long does it take the temp control valve to move from full cold to full hot?
About 6 seconds
What does the pneumatic defog control do?
Governs only volume of airflow
What temperature does the defog system try to maintain?
200°F
What happens if defog air gets above 200°F?
Temp control valve closes and heat exchanger air enters the system until below 200°
What is the backup temp sensor’s limit and what does it do?
280°F/shuts off all airflow
If the cabin pressure switch is set to RAM DUMP, what two pneumatic systems are still powered?
Hydrualic reservoir and engine anti-ice
What happens to the pneumatic system in the event of an AC power failure?
All valves and temp setting remain as preset
What are some corrective procedures if the temperature rheostat malfunctions?
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
What are indications of an air cooling turbine failure?
Loud bang or rumbling vibration accompanied by smoke/fumes from AC outlets
What are corrective procedures for a air cooling turbine failure?
Select RAM DUMP below FL250 and reduce airspeed
What is meant by “blowing out” the defog system?
Turning defog to full and temp to full hot
What does “blowing out” the defog system do?
Clears the moisture separator precluding fogging up at level off
What is the corrective action if canopies do fog up?
Defog full and AC full cold
What causes duct howl?
Front cockpit outlet open while rear is closed or partially closed
Corrective action for duct howl?
Close front cockpit duct slightly or slight open rear cockpit duct
What does a coalescer bag malfunction look like?
Whitish smoke enters cockpit from behind the rear seat when blowing out the system
Can you continue the mission with a coalescer bag malfunction?
Yes, but write it up when you get on the ground
