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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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ENGINE INDICATING - TRAINING INFORMATION POINTS - FLIGHT LEG EXCEEDANCES
ENGINE INDICATING - TRAINING INFORMATION POINTS - FLIGHT LEG EXCEEDANCES
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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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
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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ENGINE TACHOMETER SYSTEM - GENERAL DESCRIPTION
ENGINE TACHOMETER SYSTEM - GENERAL DESCRIPTION
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
77-11-00-000
Purpose
The N1 speed sensor supplies a low pressure rotor speed
signal to these components:
* Electronic engine control (EEC)
* Display electronics units (DEU)s
* Airborne vibration monitoring (AVM) signal conditioner.
Component Location
The N1 speed sensor is on the right side of the engine, just aft of
the oil tank. You can only see the housing with the electrical
connectors when the sensor is on the engine. You open the
right fan cowl to get access to the N1 speed sensor.
Physical Description
The N1 sensor has three independent sensing elements at its
end. Each sensing element has a pole piece and an electrical
winding around a magnet. The N1 sensor has three electrical
connectors.
The two dampers prevent sensor vibration.
Training Information Point
You must measure the clearance between the sensor flange
and the fan frame sleeve before you tighten the two installation
bolts.
CAUTION: MAKE SURE THE N1 SPEED SENSOR CLEARANCE
IS IN LIMITS BEFORE YOU TIGHTEN THE TWO
BOLTS. IF THE CLEARANCE IS NOT IN LIMITS,
DAMAGE TO THE SENSOR CAN OCCUR.
ENGINE TACHOMETER SYSTEM - N1 SPEED SENSOR
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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ENGINE TACHOMETER SYSTEM - N1 SPEED SENSOR
ENGINE TACHOMETER SYSTEM - N1 SPEED SENSOR
EFFECTIVITY
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
77-11-00-001
Purpose
The N2 speed sensor supplies the high pressure rotor speed
signal to these components:
* Electronic engine control (EEC)
* Display electronics units (DEU)s
* Airborne vibration monitoring (AVM) signal conditioner.
Component Location
The N2 speed sensor is on the forward face of the engine
accessory gearbox (AGB). It is above the engine starter. You
open the left fan cowl to get access to the N2 sensor.
Physical Description
The N2 sensor has three independent sensing elements at its
end. Each element has a pole piece and an electrical winding
　
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