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The EEC uses EGT signals for these functions:
* Show EGT on the common display system (CDS)
* Engine hot start and wet start (no ignition) logic
* Low pressure turbine (LPT) cooling logic.
See the engine starting section for more information about
engine hot and wet start logic. (SECTION 80-00)
See the air cooling section for more information about LPT
cooling logic. (SECTION 75-20)
The EEC sends the EGT data to the display electronics units
(DEU)s on an ARINC 429 bus.
The DEUs are part of the CDS. The DEUs usually show EGT on
the upper center display unit. EGT can also show on the lower
center and inboard display units.
EXHAUST GAS TEMPERATURE (EGT) INDICATING SYSTEM - GENERAL DESCRIPTION
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EXHAUST GAS TEMPERATURE (EGT) INDICATING SYSTEM - GENERAL DESCRIPTION
EXHAUST GAS TEMPERATURE (EGT) INDICATING SYSTEM - GENERAL DESCRIPTION
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General
There are eight thermocouples and four T49.5 thermocouple
harnesses on each engine. The T49.5 thermocouple harness
includes these parts:
* Thermocouple (2)
* Tube (2)
* Junction box.
Purpose
The EGT thermocouples supply analog signals which are
proportional to the exhaust gas temperature.
The T49.5 thermocouple harnesses send the thermocouple
signals to the EEC. The EEC uses these signals for engine
control and indication.
Component Locations
The thermocouples are inside the second stage nozzles of the
low pressure turbine (LPT). Wires from the thermocouples go to
the nearest junction box. The wires are inside a tube.
There are two T49.5 thermocouple harnesses on each side of
the turbine case. A wire harness connects the EEC to the
junction box near the thermocouples.
Training Information Point
You replace the T49.5 thermocouple harness as a unit.
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EXHAUST GAS TEMPERATURE (EGT) INDICATING SYSTEM - EGT THERMOCOUPLES AND HARNESSES
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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.
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These indications change to red when the EGT is more than the
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