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CHAPTER 77
Engine Indicating
CH-SC-SU Subject Page Effectivity
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77-31-00 AVM SYSTEM - AVM SIGNAL CONDITIONER BITE - ENGINE
BALANCE PG 1 - TRAINING INFORMATION POINT
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77-CONTENTS
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
CHAPTER 77
Engine Indicating
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The engine indicating system continuously supplies engine
data to the common display system (CDS). The engine
indicating system has these subsystems:
* Low pressure rotor tachometer (N1)
* High pressure rotor tachometer (N2)
* Exhaust gas temperature (EGT)
* Airborne vibration monitoring (AVM).
The CDS usually shows engine data on two display units (DUs).
One DU shows the primary engine display and the other shows
the secondary engine display. The primary engine display
usually shows on the upper center DU. The secondary engine
display usually shows on the lower center DU. Engine data can
also show on the inboard DUs.
Abbreviations and Acronyms
* altn - alternate
* AVM - airborne vibration monitoring
* BITE - built-in test equipment
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* BSV - burner staging valve
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* CAS - calibrated air speed
* CDS - common display system
* CDU - control display unit
* chap - chapter
* DEU - display electronics unit
* DU - display unit
* EEC - electronic engine control
* EGT - exhaust gas temperature
* FDAU - flight data acquisition unit
* FDR - flight data recorder
* FFCCV - fan frame compressor case vertical (sensor)
* FMCS - flight management computer system
* FMV - fuel metering valve
* HPC - high pressure compressor
* HPT - high pressure turbine
* HPTACC - high pressure turbine active clearance control
* LPC - low pressure compressor
* LPT - low pressure turbine
* LPTACC - low pressure turbine active clearance control
* REV - thrust reverser sleeve position
* tach - tachometer
* TBV - transient bleed valve
* TRA - thrust resolver angle
* TRF - turbine rear frame
* UTC - universal time coordinate
* VBV - variable bleed valve
* VSV - variable stator vane
* vib - vibration
ENGINE INDICATING - INTRODUCTION
EFFECTIVITY
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D633A101-GUN Jun 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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ENGINE INDICATING - INTRODUCTION
ENGINE INDICATING - INTRODUCTION
EFFECTIVITY
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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
77-00-00-000
General
The engine indicating system shows these parameters for each
engine:
* Low pressure rotor speed (N1)
* High pressure rotor speed (N2)
* Exhaust gas temperature (EGT)
* Engine vibration.
Electronic Engine Control
The electronic engine control (EEC) receives an analog input
from these engine sensors:
* N1 speed sensor
* N2 speed sensor
* EGT probes (T49.5).
The EEC changes the analog signals to digital signals. The EEC
sends the digital signals on an ARINC 429 data bus to the
　
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