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EXHAUST GAS TEMPERATURE (EGT) INDICATING SYSTEM - EGT THERMOCOUPLES AND HARNESSES
EFFECTIVITY
GUN ALL 77-21-00
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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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
77-21-00-001
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EXHAUST GAS TEMPERATURE (EGT) INDICATING SYSTEM - EGT THERMOCOUPLES AND HARNESSES
77-21-00
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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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
General
The engine electronic control (EEC) supplies the EGT signals to
the DEUs to show on the common display system (CDS). The
temperature that shows is an average from the eight
thermocouples on the engine.
EGT Digital Readout and Pointer
The EGT digital readout shows EGT in degrees celsius. The
digital readout and the box around are usually white.
A pointer on a round dial also shows EGT. The dial does not
have a scale. A shaded area follows the pointer. The pointer is
usually white. The shaded area is usually gray.
These indications change to amber when the EGT is more than
the EGT maximum continuous limit, but less than the EGT
redline:
* EGT digital readout
* Box around the digital readout
* Pointer
* Shaded area.
GUN 001-099, 101-115
During take-off, the amber band color change is inhibited for
five minutes or until completion of take-off, whichever comes
first.
GUN 201-999
During take-off, the amber band color change is inhibited for
five minutes or until completion of take-off, whichever comes
first. If one engine fails within the first five minutes of the amber
band inhibit, the amber band color change inhibit will be
extended to ten minutes for the operating engine.
GUN ALL
These indications change to red when the EGT is more than the
EGT redline:
* EGT digital readout
* Box around the digital readout
* Pointer
* Shaded area.
When the exhaust gas temperature goes back to the normal
range, the indication color goes to white.
When the EEC deenergizes after engine shutdown, the box
around the digital readout changes to red if EGT was more than
redline during the engine operation.
The EEC deenergizes after an engine run, when N2 speed goes
less than about 10 percent. When the EEC deenergizes, the
digital readout, pointer, and shaded area go blank.
EXHAUST GAS TEMPERATURE (EGT) INDICATING SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
77-21-00-002
See the engine tachometer system section for more information
the exceedance data display. (SECTION 77-11)
The EGT digital readout and box flash during an engine ground
start if the EEC sees a possible hot start. This function does not
work in flight. See the engine starting chapter for more
information. (CHAPTER 80)
EGT Maximum Continuous Limit and Amber Band
The EGT maximum continuous limit is the start of the EGT
caution range. Continuous operation of an engine with EGT
more than this value could cause damage to the engine. The
EEC supplies the EGT maximum continuous limit value. The
limit shows in amber.
The amber band is the EGT caution range. Continuous
operation of an engine with EGT in this range could cause
damage to the engine. The amber range shows as an arc
between the maximum continuous limit and the EGT redline.
EGT Start Redline
The EGT start redline is the maximum limit for the EGT during
an engine start on the ground. The redline shows only during
the ground start. The EGT start redline goes away when the
engine goes to idle. This redline does not show in flight.
These indications change to red when the EGT is more than the
EGT start redline during a ground start:
* EGT digital display
* Box around the digital display
* Pointer
* Shaded area.
The EEC stops fuel flow and ignition if EGT is more than the
start redline during an engine start on the ground. See the
engine starting chapter for more information. (CHAPTER 80)
EXHAUST GAS TEMPERATURE (EGT) INDICATING SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 77-21-00
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D633A101-GUN Jun 10/2006
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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