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ENGINE FUEL AND CONTROL - DISTRIBUTION - BSV - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL PRE SB CFM56-7B 73-44 73-11-00
Page 25
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
73-11-00-010
The DEU energizes the ENGINE CONTROL light on the P5 aft
overhead panel and the MASTER CAUTION lights when the
DEU senses the airplane on the ground and the EEC has
detected a no dispatch condition.
ENGINE FUEL AND CONTROL - DISTRIBUTION - BSV - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL PRE SB CFM56-7B 73-44 73-11-00
Page 26
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
73-11-00-010
ENGINE FUEL AND CONTROL - DISTRIBUTION - BSV - FUNCTIONAL DESCRIPTION
ENGINE FUEL AND CONTROL - DISTRIBUTION - BSV - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL PRE SB CFM56-7B 73-44 73-11-00
Page 27
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
73-11-00-010
General
GUN ALL POST SB CFM56-7B 73-44
The fuel manifold supplies fuel to the fuel nozzles. There are
twenty fuel nozzles. The fuel nozzles send a spray of fuel into
the combustion chamber.
GUN ALL PRE SB CFM56-7B 73-44
Two fuel manifolds supply fuel to the fuel nozzles. Ten fuel
nozzles connect to each fuel manifold. The fuel nozzles send a
spray of fuel into the combustion chamber.
Fuel Manifolds
One fuel manifold is the unstaged fuel manifold, the other is the
staged fuel manifold.
The unstaged fuel manifold flows fuel continuously with the
hydromechanical unit (HMU) high pressure shutoff valve
(HPSOV) open. The HPSOV is part of the HMU.
The staged fuel manifold supplies fuel to the ten staged fuel
nozzles. The burner staging valve (BSV) lets fuel flow to the
staged fuel nozzles when it is open.
GUN ALL
Fuel Nozzles
All of the fuel nozzles have primary and secondary fuel flow. At
approximately 15 psig, the fuel nozzles open in the primary fuel
flow mode. When the fuel pressure increases to approximately
125 psig, the fuel nozzles also open in secondary fuel flow
mode.
A color code band identifies the fuel nozzle types. Four nozzles
have a silver color band. The other sixteen nozzles have a blue
color band.
The nozzles with a silver band have a higher fuel flow than the
other sixteen nozzles. This higher fuel flow supplies a stronger
spray pattern. Two of these nozzles are adjacent to each spark
igniter in the combustion chamber case. This installation helps
with engine starts. It also helps the engine to continue to
operate when the airplane flies in rain, snow, or icing
conditions.
GUN ALL PRE SB CFM56-7B 73-44
The nozzle installation around the combustion chamber case
alternate between staged and unstaged nozzles.
GUN ALL
ENGINE FUEL AND CONTROL - DISTRIBUTION - FUEL MANIFOLDS AND FUEL NOZZLES
EFFECTIVITY
GUN ALL 73-11-00
Page 29
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
Fuel Nozzle Shrouds
Each fuel nozzles has a shroud. The fuel nozzle shrouds close
over the connection between the fuel manifold and the nozzles.
If this connection leaks, the shroud prevents a fuel leak onto the
combustion chamber case.
ENGINE FUEL AND CONTROL - DISTRIBUTION - FUEL MANIFOLDS AND FUEL NOZZLES
EFFECTIVITY
GUN ALL 73-11-00
Page 30
D633A101-GUN Oct 10/2002
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
ENGINE FUEL AND CONTROL - DISTRIBUTION - FUEL MANIFOLDS AND FUEL NOZZLES
ENGINE FUEL AND CONTROL - DISTRIBUTION - FUEL MANIFOLDS AND FUEL NOZZLES
EFFECTIVITY
GUN ALL PRE SB CFM56-7B 73-44 73-11-00
Page 31
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
ENGINE FUEL AND CONTROL - DISTRIBUTION - FUEL MANIFOLDS AND FUEL NOZZLES
ENGINE FUEL AND CONTROL - DISTRIBUTION - FUEL MANIFOLDS AND FUEL NOZZLES
EFFECTIVITY
GUN ALL POST SB CFM56-7B 73-44 73-11-00
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