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flight leg 1.
Dual/Single Channel Operation
The EEC operates in either dual channel mode or single
channel mode. During normal conditions, the EEC operates in
dual channel mode. If the EEC alternator can not give power to
one EEC channel, the EEC changes to single channel operation.
The channel that receives power from the EEC alternator is the
active channel. The EEC also changes to single channel
operation if the EEC channels can not communicate with each
other.
ENGINE CONTROL Light Faults
ENGINE CONTROL LIGHT faults occur when the EEC finds a
fault that is a no dispatch condition. When one of these faults
occur and the airplane is on the ground, the DEU energizes the
ENGINE CONTROL light on the engine panel and the MASTER
CAUTION lights. The DEU energizes the ENGINE CONTROL
light when all of these conditions occur:
* Airplane is on the ground and the ground speed is less than
30 knots for more than 30 seconds or the ground speed is
increasing and is less than 80 knots
* N2 speed is more than 50 percent
* EEC BITE found a no dispatch fault.
Because the EEC is a dual channel engine control, there are
five groups of ENGINE CONTROL light faults. These are the
ENGINE CONTROL light fault groups:
* Faults that cause an ENGINE CONTROL light if they occur in
either channel A or channel B
ENGINE FUEL AND CONTROL - ENGINE CONTROL - TRAINING INFORMATION POINT - EEC BITE - INDICATIONS
EFFECTIVITY
GUN ALL 73-21-00
Page 82
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
73-21-00-199
* Faults that cause an ENGINE CONTROL light only if a fault
from this group occurs in both channels or if one fault occurs
in the active channel while the EEC is in single channel
operation
* Faults that cause an ENGINE CONTROL light only if the same
fault occurs on both channels or if one of the faults occur
while the EEC is in single channel operation
* EGT indication faults that cause an ENGINE CONTROL light if
more than two EGT faults occur in both channels or if one of
the faults occur while the EEC is in single channel operation
(there are four EGT signals)
* While in single channel operation both thrust reverser half
position signals are out of range.
The EEC finds a no dispatch fault when the engine control
system is in the applicable condition and an ENGINE CONTROL
fault for that condition occurs. For example, if one EGT signal
fault for channel A occurs while the engine is in dual channel
operation, the EEC does not find a no dispatch fault and the fault
is stored as a LONG TIME fault. However, if one EGT signal fault
occurs on channel A and the EEC is in single channel operation
with channel A active, the EEC finds a no dispatch fault.
Alternate (ALTN) Light Faults
Alternate (ALTN) faults occur and the ALTN light and MASTER
CAUTION lights come on when one of these conditions occur:
* EEC is in soft alternate mode for 15 seconds
* EEC in hard alternate mode
* EEC switch on the P5-68 panel is put to OFF (this puts the
EEC to hard alternate mode).
There are 11 possible ALTN light faults. See the Minimum
Equipment List for requirements to dispatch with the ALTN light
on.
SHORT TIME Faults
SHORT TIME faults occur when the EEC finds a fault condition
that you must correct in a short time. A SHORT TIME fault can
be deferred for 150 flight hours from the time the EEC BITE was
last monitored. For example, if you monitor the FMC CDU for
engine faults every 70 hours, and find a new SHORT TIME fault,
you may defer the new fault for 80 hours. Or, if you monitor the
FMC CDU every 150 flight hours and find a SHORT TIME fault,
you must correct the fault before the airplane can fly. These
faults do not cause an indication in the flight compartment.
There are three groups of these faults. These are the SHORT
TIME fault groups:
* Faults that are SHORT TIME faults if any fault from this group
occurs in one channel while in dual channel operation or if
one fault occurs in the standby channel while in single
channel operation
* Thrust reverser position signals out of range for a left and a
right thrust reverser while in dual channel operation or both
thrust reverser signals out of range on the standby channel
while in single channel operation
* Faults that are SHORT TIME faults if any fault from this group
occurs while in dual channel operation or single channel
operation.
ENGINE FUEL AND CONTROL - ENGINE CONTROL - TRAINING INFORMATION POINT - EEC BITE - INDICATIONS
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