Podcast
Questions and Answers
Continuous operation of an engine depends on the simultaneous function of ___________ ____________
Continuous operation of an engine depends on the simultaneous function of ___________ ____________
auxiliary systems
Which of these are nine main systems found on small airplanes? (Select all that apply)
Which of these are nine main systems found on small airplanes? (Select all that apply)
How does airflow work in small airplanes?
How does airflow work in small airplanes?
Air flows into the engine compartment through openings in front of the engine cowling. Baffles route this air over the engine and it is expelled through openings in the lower, aft portion of the engine cowling.
The air cooling system is less effective during _____
The air cooling system is less effective during _____
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What are the two important functions of oil systems? (Select all that apply)
What are the two important functions of oil systems? (Select all that apply)
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What are the two basic types of fuel systems? (Select all that apply)
What are the two basic types of fuel systems? (Select all that apply)
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Explain Gravity-Feed type of fuel system in Cessna 172.
Explain Gravity-Feed type of fuel system in Cessna 172.
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Fuel must be available to the engine under all conditions of:
Fuel must be available to the engine under all conditions of:
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Aviation gasoline is different from automobile gasoline.
Aviation gasoline is different from automobile gasoline.
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Aviation gasoline is prefixed by what?
Aviation gasoline is prefixed by what?
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Since use of the correct fuel is critical, _____ are added to the fuel to help identify the _____ and ______.
Since use of the correct fuel is critical, _____ are added to the fuel to help identify the _____ and ______.
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Aviation fuel weighs?
Aviation fuel weighs?
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What are the two forms of electricity required in aviation?
What are the two forms of electricity required in aviation?
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What does the battery provide?
What does the battery provide?
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The electrical system is turned on or off with a _______ ________.
The electrical system is turned on or off with a _______ ________.
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What is a bus bar used for?
What is a bus bar used for?
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What are circuit breakers used for?
What are circuit breakers used for?
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What is an ammeter used for?
What is an ammeter used for?
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What does a loadmeter reflect?
What does a loadmeter reflect?
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What is the significance of a pressurized cabin in aircraft?
What is the significance of a pressurized cabin in aircraft?
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Study Notes
Engine Operation and Auxiliary Systems
- Continuous engine operation relies on the simultaneous function of auxiliary systems.
- Key auxiliary systems include induction, ignition, fuel, oil, cooling, and exhaust.
Main Systems in Small Airplanes
- Small airplanes incorporate nine main systems:
- Cooling
- Oil
- Fuel
- Electrical
- Environmental Control (pressurization and oxygen)
- Landing Gear
- Induction systems (carburetor/fuel injection)
- Ignition
- Powerplant (engine and propeller)
Air-Cooled Engine Functionality
- Most small airplanes feature air-cooled engines where air flows through openings in the engine cowling.
- Baffles direct this airflow over the engine, expelling it through lower openings in the cowling.
Air Cooling System Efficiency
- The air cooling system is least effective during high-power, low-airspeed operations.
Oil System Functions
- Oil systems serve two primary functions: lubrication of moving parts and cooling by reducing friction.
- Additional roles include heat removal from cylinders, sealing between cylinder walls and pistons, and contaminant removal.
Types of Fuel Systems
- Basic fuel systems are categorized into gravity-feed and fuel pump types.
Gravity-Feed Fuel System
- In gravity-feed systems, fuel tanks are positioned above the carburetor in high-wing airplanes like the Cessna 172, which has a usable fuel capacity of 53 gallons.
Fuel Available Conditions
- Fuel must remain accessible under approved flight maneuvers, regardless of engine power, altitude, or aircraft attitude.
Fuel Pump Necessity
- Fuel pumps are installed when gravity transfer of fuel is not feasible due to airplane design constraints.
Aviation vs. Automobile Gasoline
- Aviation gasoline, known as AVGAS, differs from automobile gasoline, requiring specific grades for optimal performance.
Identifying Aviation Fuel
- Dyes are often added to aviation fuel to help identify its type and grade, ensuring the use of the correct fuel.
Aviation Fuel Weight
- Aviation fuel weighs approximately 6 lbs. per gallon.
Required Forms of Electricity
- Two forms of electricity are utilized:
- Direct Current (DC) flows in one direction, typically found in cars but is heavier and less reliable.
- Alternating Current (AC) reverses its direction, used in homes, making it lighter, simpler, and more reliable, thus preferred for aviation.
Battery Function
- The battery supplies power for engine start-up and serves as a backup in case the alternator fails.
Master Switch Operation
- The electrical system is activated using a master switch which powers all circuits except the ignition system; turning it off during flight does not stop the engine.
Master Switch Characteristics
- The master switch is a split-rocker type:
- Left side controls the alternator
- Right side controls battery power
Bus Bar Purpose
- A bus bar connects the main electrical system to various equipment using electricity.
Circuit Breakers Role
- Circuit breakers protect equipment from electrical overloads, engaging either manually or automatically.
Ammeter Utility
- An ammeter monitors the alternator/generator’s performance in producing sufficient electrical power.
Loadmeter Function
- A loadmeter reflects the total electrical load on the system.
Pressurized Aircraft Benefits
- Pressurized aircraft are designed to fly at high altitudes, with sealed compartments maintaining higher air pressure than the outside environment.
Cabin vs. Aircraft Altitude
- Understanding cabin altitude in relation to aircraft altitude is crucial for operation and safety in pressurized conditions.
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Description
Explore key concepts and definitions from Chapter 7 of the Pilot's Handbook of Aeronautical Knowledge (PHAK). This quiz includes essential systems such as fuel, oil, and engine auxiliary functions. Perfect for aviation students and enthusiasts looking to enhance their understanding of aircraft systems.
