(7) TORQUE the drain plug (20) to between 45 and 55 lbf.in (0.50 and 0.62 m.daN).
(8) Safety the drain plug (20) to the fuel pump cover with lockwire 0.032 in. (0.8 mm) dia. (Material No. CP8001) or lockwire 0.032 in. (0.8 mm) dia. (Material No. CP8002).
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R Location of Drain Plug at the bottom of Fuel pump Figure 201/TASK 73-00-00-991-300
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________ Subtask 73-00-00-410-051
A. Close Access
(1) Make sure that the work area is clean and clear of tool(s) and other items.
(2) Close the fan cowl doors: (Ref. TASK 71-13-00-410-040)
FOR 1000EM1
437AL, 438AR
FOR 1000EM2
447AL, 448AR
(3) Remove the warning notice(s).
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DISTRIBUTION - DESCRIPTION AND OPERATION
________________________________________
1. General
_______
**ON A/C 001-049, 051-099, 101-105, 151-199, 201-211,
(Ref. Fig. 001)
The engine fuel supply distribution system mainly consists of:
- a fuel supply line
- an engine two-stage pump and filter assembly
- an engine oil/fuel heat exchanger (Ref. 79-20-00)
- a servo fuel heater
- a hydromechanical unit (Ref. 73-20-00)
- an IDG oil cooler
- a fuel return valve system
- a burner staging valve
- a fuel manifold
- 20 fuel nozzles (16 standard and 4 pilot nozzles)
R **ON A/C 106-149, 212-299, 301-399, 401-499,
(Ref. Fig. 001)
The engine fuel supply distribution system mainly consists of:
- a fuel supply line
- an engine two-stage pump and filter assembly
- an engine oil/fuel heat exchanger (Ref. 79-20-00)
- a servo fuel heater
- a hydromechanical unit (Ref. 73-20-00)
- an IDG oil cooler
- a fuel return valve system
- a fuel manifold
- 20 fuel nozzles (16 standard and 4 pilot nozzles)
**ON A/C ALL
2. Plumbing
________
A. Fuel Supply Line (Ref. Fig. 002) The fuel supply line is connected to the hydraulic junction box attached on the left side of the pylon in the fan compartment. It is routed along the left fan case side down to the pump. All the brackets and tubing are built in 321 stainless steel and are fire-proof.
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R Engine Fuel System - Schematic Figure 001
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Fuel Supply Line
Figure 002
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B. Fuel Return Line The fuel return line is connected to the fluid junction box attached on the left side of the pylon in the fan compartment. It is routed along the left fan case side down to the fuel return valve. All the brackets and tubing are built in 321 stainless steel and are fire-proof.
3. Fuel Pump and Filter Assembly
_____________________________
A. General
(Ref. Fig. 003, 004, 005)
(1) The fuel pump pressurizes and circulates the fuel in the fuel system. The tank fuel pumps deliver the fuel supply up to the engine fuel pump inlet. The fuel then enters the low pressure (LP) stage of the fuel pump. After initial pressurization, the fuel is delivered to the main oil/fuel heat exchanger. There it cools the engine oil.
(2) On discharge from the heat exchanger, the fuel flows back to the pump. It passes through a disposable filter before undergoing a second pressure increase in the high pressure (HP) stage of the pump. The fuel then enters the wash filter where it is divided into a filtered and unfiltered flow. The unfiltered flow bypasses the filter and enters the hydromechanical fuel unit (HMU). The filtered flow goes through the servo fuel heater and then into the HMU. This flow is sufficiently hot to prevent jamming of the HMU servo-mechanisms due to ice particles. 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(16)
