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the engine ignition:
* Start lever
* Ignition selector switch
* Engine start switch.
Start Lever
The start lever controls ignition electrical power to the EEC. The
EEC receives 115v ac power for ignition when the start lever is
in the idle position.
Ignition Selector Switch
There are three ignition selector switch positions:
* IGN L (Left spark igniter)
* IGN R (right spark igniter)
* BOTH (both spark igniters).
Engine Start Switch
There are four engine start switch selection positions:
* GRD (ground start)
* OFF
* CONT (continuous ignition)
* FLT (flight).
Engine Start Switch Position (GRD)
The engine starter engages and turns the engine when you put
the engine start switch to the GRD position. You supply ignition
and fuel to the engine combustor when you move the start lever
to the idle position.
You use the GRD position to start the engine on the ground.
See the engine starting chapter for more information.
(CHAPTER 80)
GUN 001-099, 101-115
Engine Start Switch Position (OFF)
Usually the igniters do not operate when the start switch is in
the OFF position. However, the EEC turns on the ignition system
automatically if the EEC sees a possible engine flameout
condition. See the functional description page in this section for
more information about this function.
IGNITION - OPERATION
EFFECTIVITY
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GUN 001-099, 101-115 (Continued)
GUN 201-999
Engine Start Switch Position (AUTO)
Usually the igniters do not operate when the start switch is in
the AUTO position. However, the EEC turns on the ignition
system automatically if the engine cowl anti-ice system is
turned on or flaps are down. The EEC will turn on igniters if it
sees a possible engine flameout condition. See the functional
description page in this section for more information about this
function.
GUN ALL
Engine Start Switch Position (CONT)
The flight crew may turn the engine start switch to the CONT
position at these times:
* Takeoff
* Approach
* Landing
* Bad Weather.
The spark igniters, as selected by the ignition selector switch,
turn on and operate continuously when the switch is in this
position.
Engine Start Switch Position (FLT)
Both spark igniters operate continuously when you turn the
engine start switch to FLT position. The EEC does not use the
ignition selector switch position information.
IGNITION - OPERATION
EFFECTIVITY
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IGNITION - OPERATION
IGNITION - OPERATION
EFFECTIVITY
GUN 001-099, 101-115 74-00-00
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74-00-00-008
IGNITION - OPERATION
IGNITION - OPERATION
EFFECTIVITY
GUN 201-999 74-00-00
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THIS PAGE IS INTENTIONALLY LEFT BLANK
IGNITION - OPERATION
74-00-00
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The control display unit (CDU) helps you do troubleshooting of
the ignition system.
You can also use the CDU to do a ground test of the ignition
system.
See the engine indicating chapter for more information.
(CHAPTER 77)
IGNITION - TRAINING INFORMATION POINT
EFFECTIVITY
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IGNITION - TRAINING INFORMATION POINT
EFFECTIVITY
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