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EFFECTIVITY
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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LONG TIME Faults
You can defer a LONG TIME fault for approximately 500 flight
hours from the time the EEC BITE was last monitored. These
faults do not cause an indication in the flight compartment.
For example, the remaining flight hours (T) = 500 flight hours -
S/2, where S/2 is one half the scheduled maintenance interval
your airline uses to check the EEC BITE.
If your airline looks for EEC faults every 70 flight hours, S/2 =
35. If you airline looks for EEC faults every 150 flight hours, S/2
= 75.
ECONOMIC Faults
ECONOMIC faults occur when the EEC finds a fault condition
that does not have a set deferral time but should be corrected at
operator convenience. These faults detect conditions that may
make the engine operation less efficient. These faults do not
cause an indication in the flight compartment.
Training Information Point
You use the fault isolation manual (FIM) to interpret engine
faults that show on the CDU.
ENGINE FUEL AND CONTROL - ENGINE CONTROL - TRAINING INFORMATION POINT - EEC BITE - INDICATIONS
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73-21-00-199
ENGINE FUEL AND CONTROL - ENGINE CONTROL - TRAINING INFORMATION POINT - EEC BITE - INDICATIONS
ENGINE FUEL AND CONTROL - ENGINE CONTROL - TRAINING INFORMATION POINT - EEC BITE - INDICATIONS
EFFECTIVITY
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General
The EEC BITE shows on the control display unit (CDU).
To see the EEC BITE data or do engine ground tests, select
ENGINES on the MAINT BITE INDEX page.
ENGINE/EXCEED BITE INDEX Page
The ENGINE/EXCEED BITE INDEX page lets you select the
ENGINE 1 or 2, or EXCEEDANCES.
If you want to do engine BITE for engine 1, select ENGINE 1. If
channel A can not get data from channel B and channel B can
not get data from channel A, the CDU uses channel B only to do
EEC BITE. To do engine BITE for engine 1 with EEC channel A,
select ENGINE 1 CH A ONLY.
You do engine 2 BITE the same as engine 1.
MAIN MENU
These are the 5 EEC BITE functions you can do from the MAIN
MENU page:
* RECENT FAULTS
* FAULT HISTORY
* IDENT/CONFIG
* GROUND TESTS
* INPUT MONITORING.
You can use the above EEC functions when the airplane is on
the ground. You cannot do EEC BITE in flight. To use the
GROUND TEST function, N2 must be less than 5 percent and the
start lever must be in the CUTOFF position. To use the RECENT
FAULTS or FAULT HISTORY functions, N2 must be less than 5
percent.
ENGINE FUEL AND CONTROL - ENGINE CONTROL - TRAINING INFORMATION POINT - EEC BITE - MAIN MENU
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73-21-00-201
ENGINE FUEL AND CONTROL - ENGINE CONTROL - TRAINING INFORMATION POINT - EEC BITE - MAIN MENU
ENGINE FUEL AND CONTROL - ENGINE CONTROL - TRAINING INFORMATION POINT - EEC BITE - MAIN MENU
EFFECTIVITY
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73-21-00-201
General
The RECENT FAULTS function gives you the faults stored in
EEC non-volatile memory (NVM) for the last three flight legs.
The EEC stores up to 10 faults in each dispatch level. If there are
10 faults stored in EEC memory for a given dispatch level during
the last 10 flight legs and a new fault occurs with the same
dispatch level, the EEC erases the oldest fault to make space for
the new fault. One fault shows on each page. The EEC erases
all faults that are older than 10 flight legs.
If data is not available from both EEC channels, you see a
message that tells you which EEC channel the CDU cannot use.
You select CONTINUE to see the data for the channel the CDU
can use.
The dispatch level shows on line 3 of the RECENT FAULTS
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