Fuel Systems Flashcards
Naturally aspirated single engine airplanes
10 secs. After switching for full flow
Turbo charged single engine and multiengine
20 secs. After switching for full fuel flow
Fuel tanks requirements
Tank must have a expansion space not less then 2% of the tank capacity
Bladder cells
Bladder is held in place buttons or snaps
Drip sticks
Used to measure the fuel in the tank
Ejector
Used to scavenge filial from remote areas of the tanks, no moving parts, uses Venturi principle
Filler caps
Word fuel, minimum fuel grade
Electronic
Measures the weight of fuel (lbs) rather then volume
Fuel jettison system
Primary purpose is to quickly lower landing weight , usually accomplish through a common manifold and outlet in each wing.
Fuel tanks cleaning
Wash out with hot water and detergent, then steam clean, purge fuel tanks with carbon dioxide
Fuel flow requirements for gravity feed fuel system
Ay least 150% of the takeoff fuel consumption
Fuel flow requirements for pressure pump fuel systems
At least 125% of takeoff flow
What are the requirements placards for recip. Engines
Avgas,min fuel grade
Three types of fuel tanks
Integral,Rigid removable,bladder cell,surge
Why are baffles installed in integral tanks
To prevent sloshing of fuel and fuel surging
Which tank is formed by the aircraft structure
Integral tanks
What is the purpose of check/flapped valves
Prevent fuel from flowing away from boost pumps
What are surge tanks designed for
Overflow and spillage
Drip sticks measure what
Amount of fuel in the tank
Why are centrifugal pumps used
To prevent vapor lock
How does a jet pump operate
Used the venteri principal, used to scavage fuel from remote areas of the tank
Where is the master strainer located
Lowest point of the system
What does an electronic fuel quantity indicator consist of?
Bridge circuit,amplifier,indicator,no moving parts
Advantage of pressure fueling
Allows all tanks to fill from a single point, reduces the chance of fuel contamination
