APU Fuel System - Component Location Figure 001 (SHEET 1)

R EFF : 001-003, 051-099, 401-499, 49-30-00Page 2 Config-1 Aug 01/05
 CES

 APU Fuel System - Component Location Figure 001 (SHEET 2)

R EFF : 001-003, 051-099, 401-499, 49-30-00Page 3 Config-1 Aug 01/05
 CES

 B. Fuel Control (Ref. 49-32-00) The APU fuel control subsystem operates fully automatically. During APU operation, the FCU, which is governed by the ECB, meters the fuel dependent on the APU load condition. The FDDVA distributes the fuel via both fuel manifolds to the fuel nozzles. During APU start-up/shut-down, the FCU increases/reduces the quantity of fuel delivered to the FDDVA accordingly. During APU start, the FDDVA routs fuel to the combustion chamber via the primary fuel manifold only.

 ENGINE FUEL AND CONTROL - DESCRIPTION AND OPERATION
___________________________________________________
 1.
 General

_______ The APU fuel system meters and distributes the fuel it receives from the A/C fuel system (Ref. 28-22-00). Incoming fuel is received by the fuel control unit (FCU) and pumped to the flow divider assy. From there it is ducted via the fuel manifolds to the fuel nozzles. A separate fuel circuit is provided to hydraulically operate the IGV-actuator and the Surge Control Valve (SCV).

 2.
 Component Location

__________________
 (Ref. Fig. 001)

 -------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA
 | | | | DOOR | REF. -------------------------------------------------------------------------------4005KM2 FUEL CONTROL UNIT (FCU) 315 315AL 49-32-11
 FLOW - DIVIDER 315/ 315AL 49-32-12 MANIFOLD - PRIMARY FUEL 315/ 315AL/ 49-31-43 316 316AR MANIFOLD - SECONDARY FUEL 315/ 315AL/ 49-31-44 316 316AR NOZZLES - PRIMARY AND SECONDARY FUEL 315/ 315AL/ 49-31-45 316 316AR
 3. System Description
__________________
 A. Fuel Distribution (Ref. 49-31-00) Incoming fuel from the A/C fuel system is received by the FCU. The FCU diverts some of the fuel into a hydraulic circuit to operate the IGV-actuator and the SCV. Returned fuel is routed back into the FCU. The FCU also pressurizes and meters the fuel for APU operation. The fuel is passed through the flow divider assy to the primary and/or secondary fuel manifold. These deliver the fuel to the 10 dual-orifice fuel nozzles, located around the circumference of the combustion chamber. There the fuel is atomized.

R  EFF : 001-049, 101-105, 107-107, 151-199, 49-30-00Page 1 201-210, Config-2 Aug 01/05
 CES

 APU Fuel System - Component Location Figure 001 (SHEET 1)

R  EFF : 001-049, 101-105, 107-107, 151-199, 49-30-00Page 2 201-210, Config-2 Aug 01/05
 CES

 APU Fuel System - Component Location Figure 001 (SHEET 2)

R  EFF : 001-049, 101-105, 107-107, 151-199, 49-30-00Page 3 201-210, Config-2 Aug 01/05
 CES

 B. Fuel Control (Ref. 49-32-00) The APU fuel control system operates fully automatically. During APU operation, the FCU, which is governed by the ECB, meters the fuel dependent on the APU load condition. The flow divider assy distributes the fuel via both fuel manifolds to the fuel nozzles. During APU start-up/shut-down, the FCU increases/reduces the quantity of fuel delivered to the flow divider assy. During APU start, the flow divider assy passes fuel to the combustion chamber via the primary fuel manifold only.

R  EFF : 001-049, 101-105, 107-107, 151-199, 49-30-00Page 4 201-210, Config-2 Aug 01/05
 CES  ENGINE FUEL AND CONTROL - DESCRIPTION AND OPERATION

___________________________________________________
 1. General_______ The APU-side fuel system meters and distributes the fuel it receives from the A/C APU fuel supply system (Ref. 28-22-00). Incoming fuel is received by the fuel control unit (FCU) and pumped to the flow divider. From there it is ducted via the fuel manifolds to the fuel nozzles. A separate fuel circuit is provided to hydraulically operate the IGV-actuator and the BCV-actuator.
 2. Component Location__________________
 -------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF.
 -------------------------------------------------------------------------------FUEL CONTROL UNIT (FCU) 315 315AL 49-32-11 FLOW DIVIDER 315 315AL 49-32-12 MANIFOLD - MAIN FUEL 315/ 315AL/ 49-31-41 316 316AR MANIFOLD - PILOT FUEL 315/ 315AL/ 49-31-42 316 316AR NOZZLES - MAIN FUEL 315/ 315AL/ 49-31-41 316 316AR NOZZLES - PILOT FUEL 315/ 315AL/ 49-31-42 316 316AR
 3. System Description__________________
 A. Fuel Distribution (Ref. 49-31-00) Incoming fuel from the A/C APU fuel supply system is received by the FCU. The FCU diverts some of the fuel into a hydraulic circuit to operate the IGV-actuator and the BCV-actuator. Returned fuel from the actuators is routed back into the FCU fuel inlet. The FCU also pressurizes and meters the fuel destined for APU operation. The fuel is ducted via a supply line to the flow divider, which distributes the fuel, depending on APU operating conditions, to the pilot and/or main fuel manifold. These deliver the fuel to the 3 pilot fuel injectors and/or the 6 main fuel injectors, located around the circumference of the combustion chamber. There the fuel is atomized.
　
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