System Components Flashcards
What are Fuel booster pumps
Boost pumps provide a positive flow of fuel to the engine. By far the moist popular
The amount of fuel delivered by these pumps is based on their design.
What are Fuel strainers
What are Fuel manifolds
How are fuel manifolds Identified
The tubing is made of aluminium alloy, flexible hoses are made from rubber or Teflon. Some high temperature areas may utilise stainless steel tube, and be protected by heat proof
coverings.
What are Transfer Fuel valves
What types of transfer fuel valves are there
Float
Solenoid
Transfer valves
Shut off
What are couplings
Fuel couplings: The most common type of fuel manifold coupling found on NZDF aircraft is the Wiggins coupling
What are fuel heaters
Used for De-icing.
Hot oil from the engine power section is passed through a heat exchanger. The fuel line passes through the heat exchanger and heats up which melts any ice
Outline the operation of a centrifugal boost pump
An electric driven motor drives a centrifugal pump which uses a small impeller to sling fuel out into the discharge line.
Some centrifugal pumps have a small agitator on the pump shaft that stirs up the fuel being drawn into the impeller. Any of the tiny bubbles are forced to collapse into larger bubbles and float to the top of the tank rather than the fuelling
The amount of fuel delivered by these pumps is based on their design.
What are fuel shut off valves
valves in the fuel system
solenoid operated
When the solenoid is energised a current flows through a
coil, it exerts a magnetic pull on the valve stem to open the valve. When the spring-loaded stem is raised
sufficiently a notch in the stem prevents the valve from closing.
When the closing solenoid is energised the
closing pin is drawn back and the valve opens (with the help of the main spring)
How are fuel lines constructed
Made from the highest quality material
Must conform to approved aircraft practises
Made of aluminium alloy
Teflon or rubber if flexible
What is the purpose of fuel valves
Provide a means of shutting off fuel flow for tank and engine selection
