Fuel Systems Flashcards
What are the fuel flow requirements for gravity feed fuel systems?
At least 150% of the takeoff 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 and minimum fuel grade
What are four types of fuel tanks?
Integral, Rigid removable, Bladder, Surge
Why are baffles installed in integral tanks?
To prevent sloshing of the fuel and fuel surging
Which tank is formed by the aircrafts 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 are used to measure what?
The amount of fuel in the tank
Why are centrifugal pumps used?
To prevent vapor lock in fuel lines at high altitudes
How does a jet pump operate?
Using the venturi principal
Has no moving parts
Where is the master strainer located?
At the lowest point of the system
What does an electronic fuel quantity indicator consist of? How many moving parts does it have?
A bridgecircuit, 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
Where should defueling be accomplished? Which tanks should be defueled first?
Outside. Outboard wing tanks first
What is a cross feed system?
Any tank can 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
How are fuel tanks cleaned?
Washed out with hot water and a detergent, then Steam cleaned
What is used to purge fuel tanks?
Carbon Dioxide
What are the four classifications of fuel leaks?
Stain, Seep, heavy seep, running leak
What is Reid vapor pressure?
Amount of pressure required on a liquid to keep it from vaporizing
What is the name of the fuel additive that improves performance?
Tetraethyl Lead (TEL)
What is the name of the fuel additive that removes lead?
Ethylene Dibromide
What has a strong swelling action on rubber hoses and parts?
Aeromatics
What are aviation fuels rated with?
A performance number
What should be done if the required grade fuel is not available?
Use the next higher grade
What are 2 problems associated with 100LL fuel?
-Lead fouling of spark plugs
-Hot spots which can lead to pre-ignition
For transport category aircraft, it is required that each fuel system have at least _____% of the fuel flow under each intended operating condition and maneuver.
100%
What prevents exhaustion of the tank by giving a positive indication that a change of tanks is needed?
Fuel Pressure Indicators
When using fuel pressure indicators, the transmitter converts fluid pressure into what?
An electrical signal
What is used to determine when there is danger of ice crystals forming in the fuel?
Fuel Temperature Indicator
Metal tanks must withstand an internal test pressure of what?
3.5 PSI
Tanks must have an expansion space not less than ____% of the tank capacity.
2%
What type of tank must be supported by the structure and not the fuel load?
Bladder
What must be maintained in the vapor space inside of the bladder tanks?
Positive Pressure
Fuel tanks must not be installed where?
On the engine side of the firewall
Integral tanks in a wing are said be what?
A Wet Wing
How are bladder tanks held in place?
Buttons or Snaps
Fuel systems are required to have fuel strainers and filters. TRUE or FALSE?
TRUE
What are 4 general types of fuel quantity indicators?
-Sight glass
-Mechanical
-Electrical
-Electronic
