FAA Aviation Mechanic Powerplant (AMP)Turbine EnginesHard
A turbine engine's inlet guide vanes and nose dome are protected from ice formation by circulating hot air through internal passages within these components. This anti-ice air is most commonly sourced from
- Aa ram air scoop mounted ahead of the inlet
- Bcabin recirculation air ducted forward to the engine
- Ccompressor bleed air tapped from a downstream stage
- Dexhaust gas ducted forward from the tailpipe
Show answer & explanationAnswer & explanation
Correct answer: C. compressor bleed air tapped from a downstream stage
Engine anti-ice systems typically use hot compressor bleed air, tapped from an appropriate compressor stage, ducted to internal passages in the inlet guide vanes, nose dome, and inlet cowl to prevent ice accumulation that could cause FOD or airflow disruption. Ram air and cabin air are far too cold, and routing hot exhaust gas forward is impractical and unsafe.
Why the other options are wrong
- A. Ram air is unheated ambient air and would not prevent icing.
- B. Cabin recirculation air is not routed to the engine for anti-icing purposes.
- D. Ducting hot exhaust gas forward through the engine core is not a practical or existing anti-ice design.
Engine Anti-Ice System
A system using hot compressor bleed air ducted through internal passages in the inlet guide vanes and nose dome to prevent ice formation.
- Uses bleed air tapped from compressor stages
- Protects inlet guide vanes, nose dome, and cowl lip
- Prevents FOD damage from shed ice ingested into engine
Memory trick: 'Bleed Air Beats the Freeze' on the nose dome and vanes.