Fuel Nozzles
Figure 018
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B. Operation The fuel nozzles contain both primary and secondary fuel flow passages. As the engine is started :
- the fuel passes through the inlet, and
- accumulates in the portion of nozzle that houses the valves.
The low pressure primary flow :
- is directed through the check valve
- passes through the primary passage of the nozzle tube and tip,
- enters the combustion chamber as an uniform density spray
The high pressure secondary flow activates the flow divider valve.
This fuel passes through the secondary passage of the nozzle tube and
tip.
Then it enters the combustion chamber as an uniform density, cone shaped
spray. The cone of the secondary spray is wider than that of the primary,
therefore, surrounding the primary spray pattern.
R **ON A/C 062-099, 103-149, 151-199, 203-299, 301-399, 401-499,
10. Fuel Nozzle Filter
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A. General (Ref. Fig. 019) The fuel nozzle filter is located just before the injectors. It protects the injectors from particles in suspension in the fuel.
B. Functional Description The fuel nozzle filter consists of a filter element and a by-pass valve. The filter element has a filtering capability of 300 microns absolute. In case of a clogged filter element, the valve by-passes the fuel to the injectors.
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Fuel Nozzle Filter
Figure 019
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FUEL PUMP AND FILTER ASSEMBLY - SERVICING
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TASK 73-11-10-620-002
Preservation of the Fuel Pump and Filter Assembly
1. Reason for the Job
__________________
Use this procedure when you must store the fuel pump and filter assembly after removal from the engine.
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific blanking plugs
856A3471 1 DRIVE SPLINE ADAPTER - FUEL PUMP
B. Consumable Materials
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
Material No. CP2101 *
graphite grease (Ref. 70-30-00) R Material No. CP5066 * R fuel system corrosion preventive oil (Ref. 70-30-00)
3. Job Set-up
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Subtask 73-11-10-869-054
A. Not Applicable
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4. Procedure
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Subtask 73-11-10-620-051
R A. Preservation of Fuel Pump. Flush with fuel system corrosion preventive R oil (Material No. CP5066). Before use on the pump, put the preventative fluid through a 10 microns filter. Flush the pump as follows.
R (1) Put the fluid fuel system corrosion preventive oil (Material No. R CP5066) into the inlet port of pump.
(2) Use DRIVE SPLINE ADAPTER - FUEL PUMP (856A3471P01) , turn the main drive shaft until the fluid flows out of discharge port.
(3) Tilt the pump and drain out as much fluid as possible.
(4) Install blanking plugs.
Subtask 73-11-10-640-050
B. Apply a light coat of graphite grease (Material No. CP2101) to the splines of main drive shaft and HMU drive shaft.
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TASK 73-11-10-920-001
R Remove, Inspect and Replace Fuel Filter Element __________________
1. Reason for the Job
2. Job Set-up Information 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320飞机维护手册 AMM 发动机燃油和控制 ENGINE FUEL AND CONTRO(22)
