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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
80-00-00-007
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ENGINE STARTING - FUNCTIONAL DESCRIPTION
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
General
You can use the control display units (CDUs) to troubleshoot
problems when the engine does not start.
The EEC keeps maintenance messages in its non-volatile
memory. The EEC keeps a message during an engine start if
the EGT does not increase in 15 seconds after you move the
start lever to the idle position. You use the CDU to see this
message.
See the engine indicating chapter for more information about
engine troubleshooting with the CDU. (CHAPTER 77)
ENGINE STARTING - TRAINING INFORMATION POINT
EFFECTIVITY
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80-00-00-008
ENGINE STARTING - TRAINING INFORMATION POINT
ENGINE STARTING - TRAINING INFORMATION POINT
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
80-00-00-008
General
These are the flight compartment controls you use to start the
engine:
* Engine start switches
* Ignition select switch
* Engine start levers.
Pneumatic power must be available to start the engine on the
ground.
You must monitor these engine parameters during engine
starting:
* N2
* Oil pressure
* N1
* Fuel flow
* EGT.
Engine Start
This is a summary of the engine start procedure:
* Follow safety procedures and airplane and engine
limitations
* Set the ignition select switch to IGN L or IGN R
* Put the engine start switch to the GRD position
* Look for start valve open indication
* Monitor N2
* Make sure oil pressure increases
* Speak with ground personnel to make sure N1 begins to turn
counterclockwise
* Move the engine start lever to the idle position (forward) at a
minimum of 25 percent N2
* Make sure fuel flow is in limits
* Make sure EGT increases
* Monitor EGT and N2 increase until starter cutout at 55
percent N2
* Make sure engine start switch goes back to the OFF position
at 55 percent N2
* Monitor all engine parameters as engine speed increases to
idle.
Training Information Point
Usually, only one igniter is necessary for starting. You should
use a different igniter selection for each start.
ENGINE STARTING - OPERATION
EFFECTIVITY
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ENGINE STARTING - OPERATION
ENGINE STARTING - OPERATION
EFFECTIVITY
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80-00-00-009
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ENGINE STARTING - OPERATION
EFFECTIVITY
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