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* EEC.
The ac transfer bus 1 supplies 115v ac electrical power to the
EEC for the left ignition exciter. The ac standby bus supplies
115v ac electrical power to the EEC for right ignition exciter. The
left ignition exciter for engine 2 uses power from ac transfer bus
2. The right ignition exciter uses the ac standby bus.
The EEC controls power to the ignition exciters. Input from the
flight compartment components give manual control. The EEC
has internal logic for automatic ignition system control.
Manual Control
The EEC and the CDS/DEUs monitor the position of these flight
compartment components:
* Ignition selector switch
* Engine start switches
* Start levers.
Each CDS/DEU sends a digital data signals to the EEC with
switch position information.
The EEC looks at the CDS/DEU digital data signal and the
analog signal. The EEC compares the two signals. If the CDS/
DEU 1 or CDS/DEU 2 digital data signal to the EEC logic stops,
the EEC uses the analog signal as the flight compartment input.
The EEC uses switch position data to control four internal EEC
ignition on/off switches. These switches control the 115v ac
power to the ignition exciters. Each EEC channel (A and B)
controls one ignition on/off switch to each ignition exciter. Only
one EEC channel is active at a time. Therefore, only one ignition
on/off switch, for an ignition exciter, works at a time. The other
EEC channel is in the standby mode.
115v ac power goes to the EEC when you move the start lever to
the idle position. The 115v ac power goes through the start lever
switches that are in the closed position.
The ignition exciters receive power and supply 15,000 to 20,000v
dc of electrical power to the spark igniters. The voltage goes
across the electrodes of the spark igniter to make sparks.
Flameout Protection
The EEC turns on both ignition systems of an engine
automatically if one of these conditions are true:
* The engine start lever is in the IDLE position, the start switch
is in the FLT position
IGNITION - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 74-00-00
Page 23
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
74-00-00-007
* The engine start lever is in the IDLE position, start switches
in GRD or CONT position, N2 less than idle and the airplane
is in flight
* The engine start lever is in the IDLE position, engine speed
decreases uncommanded or N2 is less than 57% and N2 is
more than 50%. For this condition only, both ignition systems
are energized for 30 seconds
GUN 001-099, 101-115
* The engine start lever is in the IDLE position, the airplane is
in flight, start switch is in the OFF position, N2 speed is less
than idle, and N2 speed is more than 5%.
GUN 201-999
* The engine start lever is in the IDLE position, the airplane is
in flight, start switch is in the AUTO position, N2 speed is less
than idle, and N2 speed is more than 5%.
GUN ALL
The EEC turns ignition off when these conditions are true:
* Engine start switches are not in a position that command
ignition operation
* Hot start on the ground
* Wet start on the ground
* The engine start lever is in the IDLE position, airplane is on
the ground, the engine completed a start, N2 speed goes
less than 50% and EGT is more than the start limit
* Ignition system energized because of N2 less than idle or
uncommanded decrease in N2 and engine speed goes back
to normal.
GUN 201-999
Automatic Ignition
The EEC turns on the selected igniter(s) when the flaps are not
up or the engine anti-ice is selected on. To keep ignitors off
when they are not needed or have no effect, more EEC logic is
used to turn ignitors on when all of these conditions are true:
* Automatic ignition feature is enabled in the CDS software
* N2 is more than 20% (engine running)
* Burner pressure is less than the igniter firing limit pressure
(175 psia)
* Thrust lever resolver angle is more than 50 degrees or the
airplane is in-flight
* Engine anti-ice is selected on or wing flaps are not up and
airplane altitude is less than 18,000 feet.
GUN ALL
IGNITION - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 74-00-00
Page 24
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
74-00-00-007
IGNITION - FUNCTIONAL DESCRIPTION
IGNITION - FUNCTIONAL DESCRIPTION
　
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