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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.
ENGINE TACHOMETER SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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ENGINE TACHOMETER SYSTEM - FUNCTIONAL DESCRIPTION
ENGINE TACHOMETER SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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77-21-00
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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).
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
EFFECTIVITY
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EXHAUST GAS TEMPERATURE (EGT) INDICATING SYSTEM - GENERAL DESCRIPTION
EXHAUST GAS TEMPERATURE (EGT) INDICATING SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
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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.
EXHAUST GAS TEMPERATURE (EGT) INDICATING SYSTEM - EGT THERMOCOUPLES AND HARNESSES
EFFECTIVITY
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EXHAUST GAS TEMPERATURE (EGT) INDICATING SYSTEM - EGT THERMOCOUPLES AND HARNESSES
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