AMS 271, Recip. Engines - Unit 4
Question and answers already passed
study guide
Concentration of air on Earth
- 78% Nitrogen
- 21% Oxygen
- 1% Other
2 main jobs of a fuel metering system?
- Maintain proper amount of fuel to cylinders
- Maintain quality of fuel
3 Advantages of float-type carbs
- Cost
- Simple
- Reliable
3 disadvantages of float type carbs
- Icing
- Limited aerobatic movement
- Efficiency (compared to fuel injection)
,3 types of carburetor icing
- Throttle Ice
- Fuel Evaporation
- Impact Ice
Throttle Ice
The low pressure from the butterfly valve (trottle) being partially closed causes
a low temperature which can lead to ice formation on the backside of the
throttle valve
Fuel Evaporation Ice
Ice forms in venturi due to fuel vaporization absorbing carb body heat
Impact Ice
Ice that forms on intake scoops and induction inlet air filter
2 carb ice prevention methods
- Carburetor Heat
- Alcohol Spray
Carburetor Heat
, Hot air from muffler / alt air source is ducted into the carburetor air inlet
Where is alcohol spray ice prevention method typically used?
Radial Engines
3 reciprocating fuel types
- 80/87 (Red)
- 100/130 (Green)
- 100LL (Blue)
What must fuel caps be labeled with?
- Type of fuel ("Avgas")
- Fuel grade
Each fuel tank should have a _____% expansion space.
2%
5 components of a gravity feed system
- Fuel tank(s)
- Lines / Hoses
- Selector Valve
Question and answers already passed
study guide
Concentration of air on Earth
- 78% Nitrogen
- 21% Oxygen
- 1% Other
2 main jobs of a fuel metering system?
- Maintain proper amount of fuel to cylinders
- Maintain quality of fuel
3 Advantages of float-type carbs
- Cost
- Simple
- Reliable
3 disadvantages of float type carbs
- Icing
- Limited aerobatic movement
- Efficiency (compared to fuel injection)
,3 types of carburetor icing
- Throttle Ice
- Fuel Evaporation
- Impact Ice
Throttle Ice
The low pressure from the butterfly valve (trottle) being partially closed causes
a low temperature which can lead to ice formation on the backside of the
throttle valve
Fuel Evaporation Ice
Ice forms in venturi due to fuel vaporization absorbing carb body heat
Impact Ice
Ice that forms on intake scoops and induction inlet air filter
2 carb ice prevention methods
- Carburetor Heat
- Alcohol Spray
Carburetor Heat
, Hot air from muffler / alt air source is ducted into the carburetor air inlet
Where is alcohol spray ice prevention method typically used?
Radial Engines
3 reciprocating fuel types
- 80/87 (Red)
- 100/130 (Green)
- 100LL (Blue)
What must fuel caps be labeled with?
- Type of fuel ("Avgas")
- Fuel grade
Each fuel tank should have a _____% expansion space.
2%
5 components of a gravity feed system
- Fuel tank(s)
- Lines / Hoses
- Selector Valve
