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Maintenance Manual (AMM) and reset all current exceedances
to reset the red box on the primary engine display.
ENGINE INDICATING - TRAINING INFORMATION POINTS - CURRENT EXCEEDANCES
EFFECTIVITY
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
77-00-00-006
ENGINE INDICATING - TRAINING INFORMATION POINTS - CURRENT EXCEEDANCES
ENGINE INDICATING - TRAINING INFORMATION POINTS - CURRENT EXCEEDANCES
EFFECTIVITY
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
77-00-00-006
ENG 1 EXCEEDS MENU
The ENG 1 EXCEEDS MENU gives a list of legs that had
exceedances. The DEUs store up to 9 legs with exceedances.
The DEU stores up to 10 exceedances per leg. The ENG 1
EXCEEDS MENU lists the legs with exceedances. The newest
leg shows first. The ENG 1 EXCEEDS MENU also gives the
number of exceedances stored for each leg.
If you select CURRENT EXCEEDANCES or FLIGHT LEG
EXCEEDANCES and the DEU has no exceedances stored in
memory, the CDU shows the NO EXCEEDENCES message.
If the exceedances occurred more than 99 legs ago, the CDU
will show the exceedances occurred on leg 99. The DEU erases
the oldest exceedance only when a tenth leg with exceedances
occurs.
The ENG 1 EXCEEDS MENU shows up to 5 legs on the first
page. If there are more than 5 legs with exceedances the other
exceedances are shown on the second page. You see the page
number for the data on the display and total number of pages on
the right side of line 2.
You erase all exceedance data for engine 1 when you select
BULK ERASE.
ENG 1 EXCEEDS Page
The ENG 1 EXCEEDS page gives this data for each reset
exceedance stored in DEU memory:
* Legs old
* Exceedance type (N1, N2, EGT RED or EGT HOT START)
* Highest parameter value (PEAK)
* Parameter redline value and total time over redline (RED)
* Flight number (FLT)
* Flight date and time in universal coordinated time (UTC)
* Altitude and computed air speed (CAS) at time of
exceedance (ALT and A/S).
The CDU shows one exceedance on each page. You find the
exceedance number and total number of exceedances for that
leg at the right side of the second line of the CDU display.
ENGINE INDICATING - TRAINING INFORMATION POINTS - FLIGHT LEG EXCEEDANCES
EFFECTIVITY
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ENGINE INDICATING - TRAINING INFORMATION POINTS - FLIGHT LEG EXCEEDANCES
ENGINE INDICATING - TRAINING INFORMATION POINTS - FLIGHT LEG EXCEEDANCES
EFFECTIVITY
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77-00-00-007
THIS PAGE IS INTENTIONALLY LEFT BLANK
77-11-00
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The engine tachometer system supplies the engine low
pressure rotor (N1) and the engine high pressure rotor (N2)
speed signals to these components:
* Electronic engine control (EEC)
* Display electronics units (DEUs)
* Engine airborne vibration monitoring (AVM) signal
conditioner.
General Description
The EEC receives two analog signals from each speed sensor.
The EEC changes these analog signals to digital signals.
The EEC uses the two signals for channel A and channel B
operation. Each channel sends data to each DEU on an ARINC
429 data bus.
Usually, the DEUs use input from the EEC to show N1 and N2 on
the common display system (CDS). The DEUs can also use
input directly from the speed sensors to show N1 and N2.
The AVM signal conditioner receives an analog input from the
speed sensors to help calculate vibration levels. See the AVM
system section for more information. (SECTION 77-31)
ENGINE TACHOMETER SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
　
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