87VU 127 824 73-25-34
87VU 127 824 73-25-34115VU 210115VU 210115VU 210
50VU 21250VU 21211VU 210 76-11-1711VU 210 76-11-1722VU 21222VU 212
452 75-41-15462 75-41-15452 438 AR 73-21-60
438 BR 462 438 AR 438 BR
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3. Distribution
____________ (Ref. Fig. 001, 002) The fuel supplied from the tanks flows through a centrifugal pump, then through the oil/fuel heat exchanger and the HP fuel pump and filters. The fuel from the HP fuel pump is delivered to the HMU in two flows :
- the main flow is directly supplied to the HMU section which controls the fuel flow supplied to the fuel nozzles (through the fuel flowmeter).
- the other part of the fuel flow passes through the servo fuel heater.
Then it flows to the HMU to elaborate reference pressures to control :
- the active clearance control
- the compressor control (VBV, VSV).
The unburned fuel from the HMU and the return flow from the servos are mixed
through the IDG oil cooler.
The fuel flow goes then :
- One part back to the centrifugal pump outlet.
- One part back to the tank, mixed with cold fuel from the centrifugal pump outlet (only if the fuel return valve is open).
4. Controlling
___________ (Ref. Fig. 005) A Full Authority Digital Engine Control (FADEC) controls the engine. The FADEC achieves steady state and transient engine performances when operated with subsystems. The FADEC is a dual channel ECU with cross talk and failure detection capability. In case of failure detection, the FADEC switches from one channel to the other. A simplified hydromechanical unit includes a fuel metering valve and servo valves to control the compressor (VBV, VSV) and engine clearances. The FADEC system performs the following functions :
- the control of the fuel flow and engine air flow and bleeds (to automatically maintain forward and reverse thrust setting and provide satisfactory transient response).
- the engine limits protection
- the automatic starting capability
- the engine clearance control
- extensive diagnostic and maintenance capability.
- thrust reverser operation
5. Indicating
__________
The engine fuel system is monitored from :
- the ECAM display
- the warning and caution lights.
The indications cover all the main engine parameters through the FADEC.
The warnings and cautions reflect :
- the engine health and status through the FADEC
- the FADEC health and status
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Component Location Figure 003 (SHEET 1)
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Component Location Figure 003 (SHEET 2)
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Component Location
Figure 003A (SHEET 1)
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