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77-11-00-000
ENGINE TACHOMETER SYSTEM - GENERAL DESCRIPTION
ENGINE TACHOMETER SYSTEM - GENERAL DESCRIPTION
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
77-11-00-000
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
EFFECTIVITY
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D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
77-11-00-001
ENGINE TACHOMETER SYSTEM - N1 SPEED SENSOR
ENGINE TACHOMETER SYSTEM - N1 SPEED SENSOR
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
77-11-00-001
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
around a magnet. The N2 sensor has three electrical
connectors.
ENGINE TACHOMETER SYSTEM - N2 SPEED SENSOR
EFFECTIVITY
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D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
77-11-00-002
ENGINE TACHOMETER SYSTEM - N2 SPEED SENSOR
ENGINE TACHOMETER SYSTEM - N2 SPEED SENSOR
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
77-11-00-002
General
The speed of the engine low pressure rotor shows in percent
N1.
The speed of the engine high pressure rotor shows in percent
N2.
Usually, the display electronics units (DEUs) use inputs from the
electronic engine control (EEC) to show N1 and N2. The DEUs
use the signals directly from the speed sensors if the EEC does
not have electrical power.
N1 Digital Readout and Pointer
The N1 digital readout shows the engine low pressure rotor
speed. The DEUs use input from the EEC or the N1 speed
sensor to show this value.
The digital readout and the box around the readout are white
when N1 is below the N1 redline.
A pointer on a round dial also shows N1 speed. A shaded area
follows this pointer. The pointer is usually white. The shaded
area is usually gray.
These indications change to red when N1 is above the N1
redline:
* N1 digital readout
* Box around N1 digital readout
* N1 pointer
* Shaded area.
When N1 goes below redline, the indication goes back to
normal color.
At engine shutdown, the box around the digital display changes
to red if there was an N1 exceedance during engine operation.
N1 Redline
The N1 redline shows the maximum certified engine low
　
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