Ice Protection Flashcards
What can ice cause?
-disturbed airflow that reduces engine performance leading to compressor stall
-engine could suck in pieces of ice which may damage fan blades & inlet vanes
What do turbine aircraft typically have for anti icing?
Internal ducting that permits hot air circulation for anti-icing
How do turboprops typically anti-ice?
Turboprops use warm engine oil with a small amount of hot air for anti-icing
How is anti icing done for the engine inlet?
-hot bleed air extracted from compressor or diffuser that gives correct pressure
-hot air sprayed in pattern to heat all surfaces on which ice is likely to form
What is the most common anti icing system?
Thermal
What are the two thermal types of anti icing?
-bleed air
-electrical heating (thermal)
What type of engines is bleed air used on mainly?
Engines with high mass airflows
Where is hot air bled off and apwhat is it passed through?
Hot air bled off engine HP compressor & passed through pressure regulating bleed valve
What protects against overpressure in the anti ice systems?
Anti icing valves
How is air used for anti icing ejected?
Overboard through small grills
How can the anti ding system be activated?
Automatically by the system or manually by the crew
Why is extreme caution needed during ground tests of anti icing systems?
The air is still hot
What does a regulator valve have in case of failiure?
Manual override
What two positions can the regulator valve be in?
Locked in open or closed position
What anti icing system is used on smaller turboprop and turboshaft engines?
Electric heat strips
