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D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
73-11-00-011
General
The fuel pump assembly receives fuel from the airplane fuel
system. The fuel pump assembly supplies fuel to the
hydromechanical unit (HMU). Fuel manifolds supply metered
fuel to the fuel nozzles.
Fuel System
The fuel pump assembly has two pumps. There is a low
pressure pump (LP) that has a centrifugal impeller. There is a
high pressure pump (HP) that uses two constant displacement
gears.
Fuel first goes to the LP pump. From the LP pump, fuel goes to
the IDG oil cooler and then to the engine oil/fuel heat
exchanger. The fuel then goes to the fuel filter in the pump
assembly.
The fuel filter cleans the fuel. A bypass valve opens if
contamination clogs the fuel filter.
After the fuel filter, fuel goes to the high pressure pump. The HP
pump increases fuel pressure for servo system operation and
for combustion.
From the high pressure pump, fuel goes through a servo wash
filter before it goes to the servo fuel heater. The servo wash
filter is in the pump assembly. The wash filter cleans fuel that
goes to the HMU servo section. A bypass valve opens if the
servo wash filter clogs. This filter does not clean fuel that goes
to the combustion chamber. The fuel that goes to the
combustion chamber goes into the HMU through a different
port than the servo fuel.
The servo fuel goes through the servo fuel heater. The servo
fuel heater uses engine oil to heat the servo fuel. Servo fuel is
heated to make sure any water in the fuel will not freeze in the
servo system. The servo fuel then goes to the servo section of
the HMU.
With EEC control, the HMU supplies fuel to operate the servo
systems, and supplies metered fuel to the manifolds. The high
pressure shutoff valve (HPSOV) stops the metered fuel flow
when it closes. The control signal to operate the HPSOV usually
comes from the start lever. The fire handle switch can override
the start lever to close the HPSOV.
GUN ALL PRE SB CFM56-7B 73-44
The metered fuel goes from the HMU through the fuel flow
transmitter and fuel nozzle filter. The metered fuel then goes to
unstaged manifold. The fuel also goes to the staged manifold
through the BSV.
ENGINE FUEL AND CONTROL - DISTRIBUTION - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 73-11-00
Page 33
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
73-11-00-012
GUN ALL PRE SB CFM56-7B 73-44 (Continued)
GUN ALL POST SB CFM56-7B 73-44
The metered fuel goes from the HMU through the fuel flow
transmitter and fuel nozzle filter. The metered fuel then goes
through the fuel manifold to the fuel nozzles.
GUN ALL
Training Information Point
The EEC uses the fuel flow transmitter signal for engine control
when the FMV position signal is not valid.
ENGINE FUEL AND CONTROL - DISTRIBUTION - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 73-11-00
Page 34
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
73-11-00-012
ENGINE FUEL AND CONTROL - DISTRIBUTION - FUNCTIONAL DESCRIPTION
ENGINE FUEL AND CONTROL - DISTRIBUTION - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL PRE SB CFM56-7B 73-44 73-11-00
Page 35
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
73-11-00-012
ENGINE FUEL AND CONTROL - DISTRIBUTION - FUNCTIONAL DESCRIPTION
ENGINE FUEL AND CONTROL - DISTRIBUTION - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL POST SB CFM56-7B 73-44 73-11-00
Page 36
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
73-11-00-012
General
The engine control system controls fuel flow for engine
operation. These are the major engine control system
components:
* Airplane data interfaces
* Sensors
* Electronic engine control (EEC)
* Hydromechanical Unit (HMU).
ENGINE FUEL AND CONTROL - ENGINE CONTROL - INTRODUCTION
EFFECTIVITY
GUN ALL 73-21-00
Page 2
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
　
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