Aircraft Fuel Systems Flashcards
What are the fuel flow requirements for gravity feed fuel systems?
At least 150% of the take off fuel consumption
What are the fuel flow requirements for pressure pump fuel systems
At least 125% of takeoff fuel flow
What are the required placards for recip engines
Avgas, Minimum fuel grade
What are the three types of fuel tanks?
1.Integral/wet wing 2. Rigid removable 3. Bladder Cell 4. Surge
Why are baffles installed in integral tanks?
To prevent sloshing of the fuel and fuel surging
Which tank is formed by the aircraft’s structure?
Integral
What is the purpose of check/flapped valves?
To prevent fuel from flowing away from the boost pump
What are surge tanks designed for?
To contain fuel overflow and spillage
Drip sticks measure what?
Fuel quantity
Why are centrifugal pumps used?
To prevent vapor lock in fuel lines at high altitudes
How does a jet pump operate?
Using the Venturi principle/ has no moving parts
Where is the master strainer located?
In the lowest point of the system
What does an electronic fuel quantity indicator consist of? How many moving parts does it have?
A bridge circuit, amplifier, indicator, and a tank unit
Has no moving parts in the tank
What is the advantage of pressure fueling?
Allows all tanks to be filled from a single point
What are the general types of fuel quantity indicators?
- Sight glass
- Mechanical
- Electrical
- Electronic
Types of Fuel Systems
- Gravity feed
- Pressure feed
- Fuel Subsystems
- Primer system
- Vent systems
Where should defueling be accomplished? Which tanks should be defueled first?
In the open (Outside) outboard wing tanks first, equipped with swept back wings
What Is a cross feed system?
Allows any tank to supply any engine
What is the purpose of a fuel jettisoning system and how does it work?
To quickly lower landing weight by dumping fuel overboard accomplished by a common manifold and outlet on each wing
How are fuel tanks cleaned?
Washed out with hot water and a detergent, than steamed cleaned
What is used to purge fuel tanks?
Carbon Dioxide
What are the four classifications of fuel leaks?
Stain, seep, heavy seep, running leak.
How are bladder tanks held in place?
Buttons or Snaps
