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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.
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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.
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See the engine indicating chapter for more information on the
EEC. (CHAPTER 77)
Engine Failure Annunciation
The ENG FAIL message supplies an early warning of an engine
malfunction. The message shows on the EGT display if these
conditions occur in this order:
* Both engines speeds are at idle or above idle
* Both start levers are at the idle position, then
* The N2 speed decreases below idle.
The ENG FAIL message shows in amber.
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Purpose
The exhaust gas temperature (EGT) indication system monitors
the exhaust gas temperature at the second stage low pressure
turbine nozzles.
General Description
The EGT system has eight thermocouples and four T49.5
thermocouple harness assemblies. Each wire harness
assembly has two thermocouples and supplies input to the
electronic engine control (EEC).
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