Module 11: Engine Fuel Flashcards
Primary purpose of the fuel system?
Give fuel and adjust for temp/press thrust setting
Secondary purpose of fuel?
Servo pressure for:
- Valve actuation
- ACC operation
- Engine/CSD/IDG cooling
If the pump is 2 stages, what are each stage?
- Impeller pump
2. + Gear type
What does the Impeller (first) pump do?
Boost flow through H.E.
or
Draw fuel from tank (motive flow)
This stage delivers HIGH pressure fuel to the FCU to ALL engines
Gear type (second) pump
What are the sub systems for FCU?
FMU
FCS
What does the fuel MANIFOLD do and what is the purpose?
`Deliver to nozzle
Single (flow divider built in)
Dual (flow divider separate)
This component atomizes the fuel to provide efficient combustion, the 2 types are SIMPLEX/DUPLEX
NOZZLES
Describe a SIMPLEX nozzle
One nozzle with SWIRL
Describe a DUPLEX
Primary (start to idle)
Secondary (preset pressure)
Protects combustion liner
Purpose of P&D valves / Fuel dividers?
- Schedule flow to nozzle
2. Cutoff and draining
What are the 4 types of FCU?
Hydro mechanical
Hydro Pneumatic
Supervisory EEC
FADEC
This FCU uses 2 governers for SHAFT/PROP and modifies compressor discharge air?
HYDROPNEUMATIC
What is the purpose of the EEC?
Prevent engine parameters from exceeding
What is FADEC? Purpose?
Full Authority Engine Control (start to finish)