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correct maintenance action:
* Highest value (peak) of the parameter during the
exceedance
* Time above redline limit.
If there is an exceedance stored in memory for the current flight
leg, the box around the digital readout shows red when these
conditions occur:
* Both start levers in the CUTOFF position
* Both engine start switches in the OFF position
* EEC BITE not in use
* N2 for both engines less than 10%.
The engine indicating system shows engine 2 data the same as
engine 1.
The engine indicating system starts a new leg for exceedances
when the airplane speed is more than 80 knots.
ENGINE/EXCEED BITE Page
The ENGINE/EXCEED BITE page lets you pick engine BITE or
EXCEEDANCES.
EXCEEDANCE MENU
The EXCEEDANCE MENU page lets you see exceedance data
for ENGINE 1 or ENGINE 2.
Training Information Point
The DEUs keep exceedance data in non-volatile memory. These
circuit breakers must be closed when you get exceedance data
to make sure the data stored in each DEU is the same:
* DISPLAY, DEU 1 HOLDUP (P6 panel)
* DISPLAY, DEU 2 HOLDUP (P6 panel)
* DISPLAY, DEU 2 PRI (P6 Panel)
* DISPLAY, DEU 1 PRI (P18 panel).
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
If there are current exceedances for engine 1, the CDU shows
the ENGINE 1 CURRENT EXCEEDANCES SUMMARY page
when you select ENGINE 1 on the EXCEEDANCE MENU. A
current exceedance is an exceedance that occurs during the
current leg and was not reset.
The engine indicating system starts a new leg for exceedances
when the airplane speed is more than 80 knots.
The engine indicating system shows engine 2 data the same as
engine 1. Only engine 1 exceedance CDU pages show on this
page.
ENGINE 1 CURRENT EXCEEDS SUMMMARY Page
The CURRENT EXCEEDS SUMMARY page gives this data about
the current exceedances:
* Exceedance type (N1 RED, N2 RED, EGT RED, EGT HOT
START)
* TIME (total time of exceedances in the current leg for each
type of exceedance)
* PEAK (highest peak value)
* QTY (number of exceedances).
ENGINE 1 Menu Page
The ENGINE 1 menu page lets you select CURRENT
EXCEEDANCES or FLIGHT LEG EXCEEDANCES. The
CURRENT EXCEEDANCES selection shows you the CURRENT
EXCEEDANCES SUMMARY page. The FLIGHT LEGS
EXCEEDANCES selection shows you the ENG 1 EXCEEDS
MENU.
CURRENT EXCEEDANCES Page
The CURRENT EXCEEDANCES page gives more data about the
exceedances stored in DEU memory. The DEUs hold up to 10
exceedances per flight leg.
The CURRENT EXCEEDANCES page gives this data for each
exceedance stored in DEU memory:
* Exceedance type (N1, N2, EGT RED, or EGT HOT START)
* Highest parameter value
* Parameter redline value and total time over redline
* Flight number
* Flight date and time in universal coordinated time (UTC)
* Altitude and computed air speed (CAS) at the time of
exceedance.
The CDU shows one exceedance on each page. The page
number and total number of pages are at the right side on the
second line of the CDU display.
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Select the line select key next to RESET to reset the
exceedance. When the exceedance is reset, the DEU does not
show the data for this exceedance on the CURRENT
EXCEEDANCE page.
Training Information Point
You must follow the maintenance action in Part II of the Airplane
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