Week 14 (Fuel Systems) Flashcards
primary function of the FUEL SYSTEM
to provide theengine with the correct (metered) fuel for all operating conditions
automatically adjusts fuel flow to compensate for changes in ambient temperatures and pressures for a selected thrust setting
Fuel Control System
What is the purpose of the Wing Shut-off Valve(aka Spar valve)?
To shutoff the fuel at the wing tank source.
__ ___ is used to heat the cold-soaked fuel delivered from the tanks to prevent ice formations entering the FCU
Fuel Heater
three most common types of Fuel filters
Wafer Screen Plain Mesh Micron
What type of filter element consists of layers of metal screen discs and is able to withstand high pressures?
Wafer Screen
What type of filter is made up of a wire screen, often formed into a cone and used in areas where filtering is not as critical?
Plain mesh
What type of filter is named after the particle unit of measure for which the filter is rated?
Micron
___ calculates and delivers metered fuel flow to the fuel nozzles to support combustion for all possible operating requirements of the engine
Fuel Control Unit (FCU)
the 2 primary FCU tasks
Fuel Computing and Metering
4 types of FCU
1) Hydro-Mechanical 2) Hydro- Pneumatic 3) Supervisory E.E.C. 4) Electronic (F.A.D.E.C)
this type of FCU uses a flyweight governor, in combination with various sensors (ie: compressor discharge pressure, combustion chamber pressure, exhaust gas pressure) to meter fuel flow into the combustion chamber.
Hydro-Mechanical
This FCU uses AIR and FUEL pressures to meter fuel for combustion
Hydro-Pneumatic
This FCU is a Combination of FADEC technology and Hydro-mechanical System
Supervisory EEC (electronic engine control)
What does FADEC stands for?
Full Authority Digital Engine Control
indicates an engine’s fuel use in real time and provide a visual display to the Flight Deck at the Fuel Flow indicator.
Fuel Flow Transimitter
purpose of fuel nozzles
to atomize the fuel to provide efficient combustion
2 primary designs of fuel nozzles
Simplex and Duplex
the ____ ____ delivers fuel to the nozzles
Fuel Manifold
are installed in the fuel delivery system to ensure that all fuel is removed after engine shutdown
Drain Valves
more viscous than avgas and as a result acts as a lubricant for the pumps and fuel control components
Jet Fuel
What is the purpose of fuel filter diff pressure bypass switch?
Switch closes when filter is clogged to illuminate a Warning Light in flight deck
You are inspecting an Oil filter and see a Red pop out indicator, what does this indicate?
Fuel Filter is clogged
What would you typically see on a Jet A fuel pipe?
Black Decal with one black strip
