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around a magnet. The N2 sensor has three electrical
connectors.
ENGINE TACHOMETER SYSTEM - N2 SPEED SENSOR
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
77-11-00-002
ENGINE TACHOMETER SYSTEM - N2 SPEED SENSOR
ENGINE TACHOMETER SYSTEM - N2 SPEED SENSOR
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
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
pressure rotor speed for the CFM56-7 engine. The redline
shows in red. The EEC supplies the redline value.
N1 Command Sector
The command sector shows the momentary difference between
N1 and the N1 command. The thrust lever position sets the N1
command.
The N1 command shows at the top edge or the lower edge of
the command sector. The N1 command shows at the top edge of
the command sector if the engine speed must increase. It
shows at the lower edge of the command sector if the engine
speed must decrease.
The command sector and N1 command are white.
ENGINE TACHOMETER SYSTEM - FUNCTIONAL DESCRIPTION
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
77-11-00-003
N1 Reference Bug
The N1 reference bug shows the N1 thrust target manually set
by the pilot. The bug can be set by the flight management
computer system (FMCS). The N1 reference bug is green.
The N1 reference digital display shows the manually set N1
target. The display is white. This display does not show for an
FMCS set target.
See the FMCS section for more information about the N1 target.
(SECTION 34-61)
N2 Digital Readout and Pointer
The N2 digital display shows the engine high pressure rotor
speed. The DEUs use input from the EEC or the N2 speed
sensor to show this value.
The digital display and box are white with N2 below the N2
redline.
A pointer on a round dial also shows N2 speed. A shaded area
follows this pointer. The pointer is usually white. The shaded
area is usually gray.
These indications change to red when N2 is above the N2
redline:
* N2 digital readout
* Box around N2 digital readout
* N2 pointer
* Shaded area.
When N2 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 N2 exceedance during engine operation.
N2 Redline
The N2 redline shows the maximum certified engine high
pressure rotor speed for the CFM56-7 engine. The EEC supplies
this value. The redline shows in red.
N1 and N2 Exceedances
The display electronic units (DEUs) hold N1 and N2 exceedance
information. You use the control display units (CDUs) to see this
information.
See the engine indicating chapter for more information on
engine exceedances. (CHAPTER 77)
Defective Speed Sensors
You can use the CDU to see speed sensor failures the EEC
finds.
ENGINE TACHOMETER SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
　
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