ATSC 231 Block 4 Exam Question and
answers verified to pass
Be able to identify the definitions of VFR, VMC, IFR and IMC - correct answer
✔VFR - Visual Meteorological Conditions
IFR - Instrument Flight Rules
VMC - Visual Meteorological Conditions
IMC - Instrument Meteorological Conditions
Compare the frequency of icing accidents relative to other weather hazards -
correct answer ✔Part 121 - only 0.8% of all weather related accidents
Part 135 - 10% of all weather related accidents
part 91 - 7% of all weather related accidents
What are the trends in statistical data relating to icing accidents including the
frequency of fatal icing accidents, ratings held, flight experience and phase of
flight - correct answer ✔Frequency - Most accidents are held by part 91, in
December and january, during cruise, in locations with mountains.
Ratings held - commercial or private certificate
Flight experience - peaks at 500 hours. The pilot typically has low time in the
make/model (no pilot is immune from icing)
phase of flight -
Define induction icing - correct answer ✔- All icing that affects powerplant
operation
What are the conditions that produce carburetor icing - correct answer ✔•
80oF to 20oF
• Result of:
- Adiabatic Pressure Drop in Venturi
- Vaporization of Fuel
What are the symptoms of carburetor icing - correct answer ✔- Fixed Pitch
Prop
• Gradual Loss of Power
• Engine Roughness
- Constant Speed Prop
• Gradual Loss of Manifold Pressure
• Engine Roughness
What is the antidote for carburetor icing - correct answer ✔• Carburetor Heat
- Full Application
- May Take Minutes to Return Power
What are the types of airplanes that are affected by inlet icing - correct
answer ✔• Reciprocating Engine Powered Airplanes
- Carbureted
- Fuel Injected
• Turbine Powered Airplanes
,What is the cause of inlet icing for propeller driven airplanes - correct answer
✔- Impact Ice (droplets freezing on contact with the engine)
• IFR Conditions
What are the conditions that produce inlet icing for propeller driven airplanes -
correct answer ✔• Visible Moisture
• Temperatures Less Than 0oC (32oF)
What is the antidote for inlet icing for propeller driven airplanes - correct
answer ✔• Alternate Air Source
• Carburetor Heat
What are the hazards associated with inlet icing for turbine powered airplanes
- correct answer ✔- Fixed Pitch Prop
• Gradual Loss of Power
• Engine Roughness
- Constant Speed Prop
• Gradual Loss of Manifold Pressure
• Engine Roughness
What are the conditions that produce inlet icing for turbine powered airplanes -
correct answer ✔- Foreign Object Debris (FOD)
This breaks off and damages the turbine blades
What is the antidote for inlet icing for turbine powered airplanes - correct
answer ✔• Anti-Ice
, Where is HIWC typically found - correct answer ✔- Tops of cumulonimbus
- Anvils
What are the hazards associated with HIWC - correct answer ✔- Turbine
engine degradation
- Flameout
Which Part of the Regulations specifically addresses flight into icing conditions
- correct answer ✔part 121 and part 135 specifically adress icing
What does the FAA interpret as 'known ice' and 'known icing conditions' -
correct answer ✔Known Icing aka known ice:
"... known or observed or detected ice accretion ..."
Known icing conditions:
actual ice observed visually to be on the aircraft by the flight crew or identified
by on-board sensors.
What are the intensities of structural icing - correct answer ✔- Trace
- Light
- Moderate
- Severe
What are the definitions and characteristics of the different types of icing -
correct answer ✔Trace:
• Ice becomes noticeable.
• Rate of accumulation slightly greater than rate of sublimation.
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