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 3. System Description__________________ (Ref. Fig. 002)
 A. Fuel Atomizers and Manifolds
 (1) The APU has 10 dual orifice fuel-nozzles. They are installed in equal distances around the outer case of the combustion chamber. This makes sure that the temperature in the combustion chamber is equally divided. Each fuel nozzle has a primary and a secondary fuel orifice. The primary orifices give accurate fuel atomization at low fuel quantity and pressure. They get a controlled fuel supply from the FCU through the flow divider assy. This is controlled by the ECB 59KD logics, during start, operation and shutdown. The secondary orifices get the fuel when the primary nozzle pressure is greater than 120psig. They provide accurate fuel atomization at high fuel consumption.

R  EFF : 001-049, 101-105, 107-107, 151-199, 49-31-00Page 1 201-210, Config-2 Aug 01/05
 CES

 Fuel Distribution - Component Location
 Figure 001

 CES

 APU Fuel Distribution - Block Diagram
 Figure 002

 CES  4. Interface

_________
 The fuel distribution system has interfaces with:

 -
the APU drain system (Ref. 49-17-00),

 -
the APU fuel control (Ref. 49-32-00),

 -
the APU fuel pump system (Ref. 28-22-00),

 -
the APU LP fuel shutoff system (Ref. 28-29-00).

 -
the IGV actuator (49-23-00).

 -
the Surge Control Valve (49-51-00)-

5. Component Description
_____________________
 (Ref. Fig. 001, 003)

 A. Flow Divider Assy The flow divider assy is installed between the FCU and the APU primary and secondary fuel nozzle manifolds. The assy consists of a check valve and a normally open fuel solenoid.
 B. Primary and Secondary Fuel Nozzle and Manifolds
 (1)
 The primary and the secondary fuel manifolds are insulated, flexible lines. The fittings connect the manifolds to the flow divider assy and to the fuel nozzles.

 (a) The flexible lines are made from teflon tubes and a single layer of steel braid makes them stronger. The fuel-tight steel fittings have conical contact faces. Rubber sheaths protect the braids.

 (2)
 The fuel nozzles have two flow paths. The orifices of the primary and the secondary flow paths are concentric.

 (a) The connectors to the fittings of the manifold are of different diameters. Filters are installed in the flow paths. The nozzle housing goes into the air shroud. The air shroud guides the air to the nozzle tip to pre-mix the fuel with air, and to sweep the nozzle tip to prevent carbon formation.
 6. Operation/Control and Indication
________________________________ At the start of the APU the fuel flow from the FCU is routed by the flow divider assy to the primary fuel manifold. The primary fuel manifold then distributes the fuel to the primary inlet port of the fuel nozzles When the fuel pressure is greater than 125 psid (8.618 bar) at the primary fuel nozzles due to increased fuel flow, the check valve within the flow divider assy opens and the fuel also flows to the secondary fuel manifold. The secondary fuel manifold than distributes the fuel to the secondary inlet port of the fuel nozzles.

R  EFF : 001-049, 101-105, 107-107, 151-199, 49-31-00Page 4 201-210, Config-2 Aug 01/05
 CES

 Dual Orifice Fuel Nozzle
 Figure 003

 CES  The check valve operation can be disabled by by the fuel solenoid, also part of the flow divider assy. The fuel solenoid is normally open (de-energized) but during cold start and high altitude operation the ECB energizes the solenoid valve to close during the first 25% speed of the APU. The fuel is then forced through the primary manifold only to achieve a better engine acceleration.

 CES

 FUEL DISTRIBUTION - DESCRIPTION AND OPERATION
_____________________________________________
 1.
 General

_______ 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.

 2.
 Component Location

__________________
 (Ref. Fig. 001)

 -------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF. -------------------------------------------------------------------------------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
　
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