737-300 400 500 AMM 飞机维护手册 发动机燃油和控制(5)

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LINE PB 
2 
INLET FUEL  ELBOW PBP 
3 
ELBOW PBP PUMP FUEL  1  MAIN CONTROL ENGINE  4 PLATE BLANKING PBP
5 
FILTER FUEL  LUBRICATION UNIT  6 TIMER HPTCC 
A 
5 6 4 3 2 1  AND WITH PBP BLANKING PLATE ENGINES WITH HPTCC TIMER ENGINES WITHOUT HPTCC TIMER AND WITHOUT PBP ELBOW ENGINES WITHOUT HPTCC TIMER AND WITH PBP ELBOW ENGINES WITHOUT HPTCC TIMER WITHOUT PBP ELBOW ENGINES WITH HPTCC TIMER AND ENGINES WITH HPTCC TIMER AND WITH PBP ELBOW ON FUEL PUMP HP HOUSING  FWD  B 
Figure 1 Fuel Distribution System Component Location 

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
ACCESSORY
GEARBOX
MEC FUEL PUMP
FUEL FILTER SEEA
FWD
BYPASS VALVE
FILTER HOUSING
FILTER
CARTRIDGE
FILTER COVER
DRAIN PLUG HANDLE
A
Fuel Filter Cartridge Location Figure 2
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
EXCHANGER OIL/FUEL HEAT  TGB 
FWD ACCESSORY GEARBOX  ASEE SERVO FUEL HEATER
FUEL PUMP  MEC 
COVER FUEL IN  FUEL OUT 
OIL IN  OIL OUT 
EXCHANGER TO OIL/FUEL HEAT ATTACHING FLANGE  HOUSING 
LOOKING FORWARD Figure 3 Servo Fuel Heater Location A  RIGHT 

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
FUEL NOZZLES (20 PLACES)
SEE B
SEE A
FUEL MANIFOLD
A
MANIFOLD SLEEVECONNECTION THREADS
FUEL INLET
FLOW DIVIDER
VALVE

NAME PLATE
NOZZLE TUBE
NOZZLE AIR SHROUD
NOZZLE TIP
B
Fuel Nozzle Location
Figure 4

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 ú  C01  Page 5
 ú  Jun 25/84 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
8.  Operation (Fig. 5)
_________
 A.  Fuel from the aircraft fuel system enters the engine at the fuel pump inlet, is pressurized through the low pressure stage of the fuel pump and flows through the fuel/oil heat exchanger and the fuel filter. Fuel then flows through the high pressure stage of the fuel pump through the wash filter, and into the MEC. Some of the fuel is extracted through the pump wash filter, heated by the servo fuel heater and supplied to the MEC to provide clean, ice-free fuel for servo operation.
 B.  The fuel pump has a higher fuel flow capacity than the fuel and control system requires, thus the fuel flow is divided in the MEC into metered flow and bypass flow. The bypass fuel is ported back to the inlet side of the fuel/oil heat exchanger, and metered fuel from the MEC flows through the pressurizing valve, the fuel flow transmitter, the fuel manifold, and fuel nozzles into the combustion chamber.
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