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ENGINE FUEL AND CONTROL - FUEL INDICATING - FUEL FILTER DIFFERENTIAL PRESSURE SWITCH
EFFECTIVITY
GUN ALL 73-30-00
Page 13
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
73-30-00-004
Fuel Flow Indication
The fuel flow transmitter supplies a start and a stop pulse to the
EEC. The EEC measures the difference between the start and
the stop pulse. The greater the time difference between start
and stop, the greater the mass-flow of metered fuel supply for
combustion. The EEC transmits the fuel flow data to the DEUs
on an ARINC 429 data bus.
GUN 001-099, 101-110, 115
The fuel flow indications usually show on the secondary engine
display. The DEUs calculate the fuel used indication. The fuel
flow indication shows in kilograms per hour (kg/hr).
GUN 201-999
The fuel flow indications show on the primary and secondary
engine displays. The DEUs calculate the fuel used indication.
The fuel flow indication shows in pounds per hour (lb/hr).
GUN 111-114
The fuel flow indications shows on the primary and secondary
engine displays. The DEUs calculate the fuel used indication.
The fuel flow indication shows in kilograms per hour (kg/hr).
GUN ALL
NOTE: Two resolvers measure the position of the fuel
metering valve (FMV). The EEC uses the channel A
and channel B resolver inputs to control fuel flow. If the
EEC cannot read resolver inputs from both channels A
and B, it can use inputs from the fuel flow transmitter.
When the EEC uses fuel flow meter data for metered
and servo fuel control, the engine acceleration time
can increase. The ENGINE CONTROL and MASTER
CAUTION lights come on when the EEC can not read
either FMV resolver.
High Pressure Shutoff Valve (HPSOV)
The high pressure shutoff valve (HPSOV), in the
hydromechanical unit (HMU), opens and closes to let metered
fuel flow. The position of the HPSOV shows on the ENGINE
VALVE CLOSED light. The light is on dim, with the valve closed.
The light is off, with the valve open.
ENGINE FUEL AND CONTROL - FUEL INDICATING - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 73-30-00
Page 15
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
73-30-00-005
Fuel Filter Bypass Warning Indication
The EEC receives the analog signal from the fuel filter
differential pressure switch. The EEC changes the analog
signal to digital data. The EEC sends the signal to the DEUs
using the ARINC 429 data bus.
The DEUs supply a ground to cause the FILTER BYPASS light
and MASTER CAUTION lights to come on. The FILTER BYPASS
light is on the fuel control panel on the P5 forward overhead
panel.
ENGINE FUEL AND CONTROL - FUEL INDICATING - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 73-30-00
Page 16
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
73-30-00-005
ENGINE FUEL AND CONTROL - FUEL INDICATING - FUNCTIONAL DESCRIPTION
ENGINE FUEL AND CONTROL - FUEL INDICATING - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 001-099, 101-110, 115 73-30-00
Page 17
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
73-30-00-005
ENGINE FUEL AND CONTROL - FUEL INDICATING - FUNCTIONAL DESCRIPTION
ENGINE FUEL AND CONTROL - FUEL INDICATING - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 111-114, 201-999 73-30-00
Page 18
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
73-30-00-005

　
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