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STRONG MAGNETIC PULL ON THE STATOR.
DAMAGE TO THESE PARTS CAN OCCUR.
ENGINE FUEL AND CONTROL - ENGINE CONTROL - EEC ALTERNATOR
EFFECTIVITY
GUN ALL 73-21-00
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D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
73-21-00-013
ENGINE FUEL AND CONTROL - ENGINE CONTROL - EEC ALTERNATOR
ENGINE FUEL AND CONTROL - ENGINE CONTROL - EEC ALTERNATOR
EFFECTIVITY
GUN ALL 73-21-00
Page 37
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
73-21-00-013
Purpose
The EEC alternators are the primary ac power supply for EEC
operation. The airplane ac transfer buses can also supply
power to the EEC.
Functional Description
The two transfer relays in the EEC let the transfer bus supply ac
power to the EEC. One relay supplies power to channel A, the
other relay supplies power to channel B.
The engine 1 alternate power relay is in junction box J22. This
relay is controlled by the DEUs. There are two contacts on this
relay, one for channel A, the other for channel B. When
energized, the alternate power relay supplies airplane transfer
bus power to the EEC through the internal EEC transfer relays.
Any of these conditions cause the DEUs to energize the
alternate power relay:
* Engine start lever set to idle
* Engine start switch set to ground (GRD)
* Engine start switch set to continuous (CONT)
* Control display unit (CDU) set to engine maintenance pages.
NOTE: The engine 2 alternate power relay is in junction box
J24. The engine 2 alternate power relay operates
almost the same as the engine 1 alternate power relay.
Operation
At engine start, the EEC receives transfer bus power. The EEC
alternator speed logic sensor monitors the speed of the EEC
alternator. When the N2 speed is more than 15 percent and
alternator power quality is in limits, the EEC energizes the
transfer relays. The transfer relays disconnect the transfer bus
power supply. The EEC now gets power from the EEC
alternator.
If one set of alternator windings fail, the transfer relay closes for
that channel. This provides alternate power from the airplane
transfer bus. The other EEC channel continues to receive power
from the alternator if the alternator power is in limits.
If both sets of alternator windings fail, both EEC channels
receive power from the airplane transfer bus through both EEC
transfer relays.
Training Information Point
If both EEC channels are normal and power from one EEC
alternator channel stops, engine control changes to the channel
with EEC alternator power and a short term dispatch fault is
stored in EEC memory. This fault shows on the CDU engine
maintenance pages. The EEC channel without EEC alternator
power gets power from the airplane transfer bus.
ENGINE FUEL AND CONTROL - ENGINE CONTROL - EEC ELECTRICAL POWER SUPPLY - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 73-21-00
Page 39
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
73-21-00-014
If the EEC is in single channel operation (the other channel is
inoperative) and EEC alternator power stops for the active
channel, the active channel gets power from the transfer bus
and a no dispatch fault is stored in EEC memory. This fault
shows on the CDU engine maintenance pages. This also
causes the ENGINE CONTROL light on the P5 overhead panel
and the MASTER CAUTION light to come on when the airplane
is on the ground. You must correct this fault before airplane
dispatch is permitted.
ENGINE FUEL AND CONTROL - ENGINE CONTROL - EEC ELECTRICAL POWER SUPPLY - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 73-21-00
Page 40
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
73-21-00-014
ENGINE FUEL AND CONTROL - ENGINE CONTROL - EEC ELECTRICAL POWER SUPPLY - FUNCTIONAL DESCRIPTION
ENGINE FUEL AND CONTROL - ENGINE CONTROL - EEC ELECTRICAL POWER SUPPLY - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 73-21-00
Page 41
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
　
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