Fuel Systems Flashcards
Fuel systems are Suitable for combustion and to control the flow to the required quantity necessary for:
Combustion
Starting
Acceleration
Stable running under all operating conditions
Fuel requirements
Ease of flow
Quick and easy starting of the engine
Complete combustion under all conditions
High calorific values
Non corrosive
No harmful by products to flame tube or turbines
Minimum fire hazard
Provide lubrication
Corrosion properties
Water content
Sulphur compounds
Volatility
Change readily from a liquid to a gas by evaporation
Calorific value
Heat produced by a given weight of fuel on complete combustion
Additives
Reduce contamination lvs and microbiological growth
Minimise corrosion
Enhance lubrication
FSII
Fuel system ice inhibitor
What does FSII do
Inhibits the fuel system against icing
Inhibits against fungal growth
Fuel type
AVTUR
Emergency = AVTAG
Whats good property about AVTUR
Reduced fire risk
Three main sources of fire hazard
Fuel spillage, ignition of vapour from a spark (static)
Fuel spillage, on hot surface causing igniting
Existence of flammable or explosive mixtures in the aircraft tanks
Fuel pumps × 2
Piston type pump
Spur gear pump
What does the piston pump involve
The swash plate
Half ball valve or spill valve
What does the spur gear puml involve
Two gears continuous
Centrifugal governors
Nimbus system components
LP Filter
Fine Filter
HP Pump
FCU & Throttle
PRV
FCU 60 psi
Solenoid valve & NRV
Torch igniter
HP Cock
Rotary atomiser
Free turbine governer
What does FADEC
Full Authority Digital Engine Control
What does a FADEC control do
It’s a central processing unit which trasnits signals
Adv to FADEC
Reduced weight
Reduced pilot work load
Engine efficency
How much channels do FADEC have
Two independent channels
What the FADEC channels called
Channel A nad B
What do the FADEC channels do
Maintain health they can both be used at separate time and they will always select the healthiest channel based on the fault priority list
Fuel system maintenance
Throttle adjustment
Filters
Rigid pipelines
Flexible pipelines
Leak checks
Fuel flow tests
