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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
73-30-00-001
ENGINE FUEL AND CONTROL - FUEL INDICATING - INTRODUCTION
ENGINE FUEL AND CONTROL - FUEL INDICATING - INTRODUCTION
EFFECTIVITY
GUN ALL POST SB CFM56-7B 73-44 73-30-00
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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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
73-30-00-001
Purpose
The fuel indicating system supplies data for these indications:
* Fuel flow rate
* Fuel used
* High pressure shutoff valve (HPSOV) position
* Fuel filter bypass.
Fuel Indicating System Components
These are some of the fuel indicating system components:
* Fuel flow transmitter
* Fuel flow indication control switch
* Fuel filter differential switch
* High pressure shutoff valve (HPSOV).
GUN 001-099, 101-110, 115
The fuel flow transmitter supplies fuel flow data through the EEC
to the DEUs. The EECs calculate the fuel flow rate and the DEUs
calculate fuel used. The fuel flow data shows on the secondary
engine display. The secondary engine display usually shows on
the lower center display unit (DU).
GUN 111-114, 201-999
The flow transmitter supplies fuel flow data through the EEC to
the DEUs. The EECs calculate the fuel flow rate and the DEUs
calculate fuel used. The fuel flow data shows on the primary and
secondary engine displays. The primary engine display usually
shows on the upper center display unit (DU) and the secondary
engine display usually shows on the lower center DU.
GUN ALL
The fuel flow indication control switch is on the engine display
control panel in the flight compartment. This switch controls the
operation of the fuel flow rate and fuel used indications in the
engine display on the display unit. The engine display control
panel is on the P2-2 center main panel. The fuel flow indication
switch is usually in the center or RATE position. A spring sets
the switch back to RATE from the other two positions. These are
the three positions of the fuel flow indication control switch:
* RESET
* RATE
* USED.
The RATE position is the usual switch position and shows the
fuel flow indication.
ENGINE FUEL AND CONTROL - FUEL INDICATING - GENERAL DESCRIPTION
EFFECTIVITY
GUN ALL 73-30-00
Page 5
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
73-30-00-002
The USED position changes from the usual fuel flow indication
to the quantity of fuel used since the counter was set to zero.
The fuel used only shows on the digital display. The analog
indication does not show in used. The used indication goes
back to the digital and analog rate indication 10 seconds after
the indication control switch goes back to RATE.
The RESET position sets the fuel used display digital counter to
zero.
NOTE: The counter also sets to zero when you remove
electrical power from, then again connect power to
the DEUs.
The EEC monitors a fuel filter differential pressure switch on the
engine. The switch measures the difference between the filter
inlet pressure and outlet pressure. If the pressure difference
becomes too large, a bypass signal goes through the EEC to the
CDS/DEUs. The DEUs cause the amber FILTER BYPASS light to
come on.
The blue ENGINE VALVE CLOSED light shows the position of
the HPSOV. With the valve closed, the light is on dim. With the
valve open, the light is off. The light is on bright when the actual
and commanded positions of the valve do not agree.
ENGINE FUEL AND CONTROL - FUEL INDICATING - GENERAL DESCRIPTION
EFFECTIVITY
GUN ALL 73-30-00
Page 6
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
73-30-00-002
ENGINE FUEL AND CONTROL - FUEL INDICATING - GENERAL DESCRIPTION
ENGINE FUEL AND CONTROL - FUEL INDICATING - GENERAL DESCRIPTION
EFFECTIVITY
GUN 001-099, 101-110, 115 73-30-00
Page 7
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
73-30-00-002
ENGINE FUEL AND CONTROL - FUEL INDICATING - GENERAL DESCRIPTION
ENGINE FUEL AND CONTROL - FUEL INDICATING - GENERAL DESCRIPTION
　
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