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FADEC Philosophy
Ennggiinnee Coonnttrrooll Syysstteem
27
Flight Operations Support
10 September 2005
CFM PROPRIETARY INFORMATION
Subject to restrictions on the cover or first pa ge
ELECTRICAL POWER SUPPLY
• Engine control alternator:
– engine start up  when N2 > 15%.
– engine shut down  until N2 < 12%.
• Aircraft 28 v:
– Engine is not running
– engine start up  until N2 > 15%.
– engine shut down  when N2 < 12%.
– Back up power supply in case of
alternator
power loss.
12% 15%
N2 SPEED
Engine Alternator power
A/C power Back-up A/C power
POWER SOURCE
ECU automatically
powered down on
ground through the
EIVMU 15 min
after shutdown or
AC power up,
unless MCDU
used
Ennggiinnee Coonnttrrooll Syysstteem
ECU: Electronic Control Unit
28
Flight Operations Support
10 September 2005
CFM PROPRIETARY INFORMATION
Subject to restrictions on the cover or first pa ge
CFM56-55 IIggnniittiioonn Syysstteem

Features
• Two independent systems per engine
- Automatically alternated every two starts
• Ignition on - slightly before fuel
• Delayed ignition logic
• Either channel can control both ignition boxes
• Ignition off when N2 >50%
• Auto message if either ignition delayed/failed
• Auto relight if “flame-out” sensed
• Pilot can select continuous ignition
• Both ignitors on for all air starts and manual starts on the ground
• Ignitors located at the 4 and 8 o’clock position on combustion case
A Ign A
ECU Plugs
115V 400Hz
B Ign B
29
Flight Operations Support
10 September 2005
CFM PROPRIETARY INFORMATION
Subject to restrictions on the cover or first pa ge
10 Fuel Nozzles
(Staged)
VSV
VBV
TBV
HPTCC
LPTCC
FUEL FLOW
TRANSMITTER
BSV
Fuel nozzle
Filter
Servo Fuel Pressure
Engine Oil
From Scavenge
Circuit
Engine Oil
Back To
Oil Tank
Fuel Filter HP PUMP
Metered Fuel
LP PUMP
IDG
FUEL/OIL
COOLER
FRV
T<100°c
MAIN OIL/FUEL HEAT
EXCHANGER
(cools the engine
scavenge oil)
SERVO FUEL HEATER
Raises the T°of the fuel
10 Fuel Nozzles
(Unstaged)
FFuueell Coonnttrrooll Syysstteem
Fuel distribution
30
Flight Operations Support
10 September 2005
CFM PROPRIETARY INFORMATION
Subject to restrictions on the cover or first pa ge
MAIN OIL/FUEL
HEAT EXCHANGER
Fuel coming from LP
pump cools the
engine scavenge oil.
The cooled engine oil
returns to the oil tank.
SERVO FUEL HEATER
Raises the T°of the fuel to eliminate ice in the
fuel before entering the control servos, inside the
HMU.
Catch particles in suspension in the oil circuit,
before the oil is coming back to the oil tank.
FUEL FLOW
TRANSMITTER
Signals are created
and sent to:
Ch A & Ch B of the
ECU  ENGINE
CONTROL
The DMCs for ECAM
display in the flight
deck  INDICATING
The FWCs for warning
activation and display
on ECAM 
INDICATING
10 Fuel Noz zles
(Staged)
VSV
VBV
TBV
HPTCC
LPTCC
FUEL FLOW
TRANSMITTER
BSV
10 Fuel Noz zles
(Uns taged)
Serv o Fuel Pres s ure
Engine Oi l
From Sc avenge
Ci rc uit
Engine Oi l
Bac k To
Oi l Tank
MAIN OIL/FUEL HEAT
EXCHANGER
(c ools the engine sc avenge oi l )
SERVO FUEL HEATER
Rais es the T°of the fuel
FFuueell Coonnttrrooll Syysstteem
Fuel distribution
16 standard fuel nozzles ( 8 staged / 8 unstaged )
4 wider spray pattern fuel nozzles placed adjacent to
the igniters to help engine operation during start and
adverse weather conditions.( 2 staged / 2 unstaged )
31
Flight Operations Support
10 September 2005
CFM PROPRIETARY INFORMATION
Subject to restrictions on the cover or first pa ge
10 Fuel Nozzles
(Staged)
FUEL FLOW
TRANSMITTER
BSV
10 Fuel Nozzles
(Unstaged)
Fuel nozzle
Filter
• The BSV « Burner Staging Valve » controls fuel
flow to the 10 staged fuel nozzles.
•The BSV will close in decel to keep the Wf above
the lean flame out limit.
• With BSV closed, a stronger flow of fuel goes to
　
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