(3)  
AIRPLANES WITHOUT EIS; The digital EGT display brightness is controlled by the auto dim control from the control dim input.

 E.  AIRPLANES WITH EIS; The EGT indication on the EIS gives an abnormal start warning by flashing on and off two times a second. The EIS reads 5 signals (N2, EGT, Fuel Flow, Computed Airspeed, and Total Air Temperature) to show when the engine has an abnormal start (AMM 31-42-00/501).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 77-21-00
 ALL  ú ú C02 Page 8 ú Mar 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
EXHAUST GAS TEMPERATURE (EGT) INDICATION SYSTEM - ADJUSTMENT/TEST
_________________________________________________________________
 1. General
_______
 A. This procedure has two tasks:
 (1)  
The operational test of the EGT Indication System

 (2)  
The system test of the EGT Indication System.

 B. The operational test is done when each engine is in operation to make ú sure that the EGT indication system operates.
 (1)  Do the operational test after you replace the thermocouple cable.
 ú  C. The system test is done to make sure that the system precision is satisfactory.
 (1) You can use the system test with the system fault isolation.
 TASK 77-21-00-715-001-C00
 2. Operational Test - EGT Indication System
________________________________________
 A. References
 (1)  AMM 71-00-00/201, Power Plant
 B. Access
 (1)  Location Zones
 101/102 Control Cabin

 C. Do the Operational Test for the EGT Indication System
 S 865-057-C00
 (1)  AIRPLANES WITHOUT EIS;
 ú  For the applicable engine, make sure that these circuit breakers are closed:
 (a)  P6 Load Control Center
 1) ENG 1 EGT IND
 2) ENG 2 EGT IND

 S 865-055-C00
 (2)  AIRPLANES WITH EIS;
 ú  For the applicable engine, make sure that these circuit breakers are closed:
 (a)  P6 Load Control Center
 1) EIS PRI 2
 2) EIS PRI 4

 S 865-005-C00
 (3)  Do the Power Plant Operation (Normal) procedure (AMM 71-00-00/201).
 S 865-006-C00
 (4) Operate each engine at the same power setting (AMM 71-00-00/201). ú ú S 215-032-C00 ú (5) Make sure that the EGT for the engine system in test is
 approximately the same as that for the other engine.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 77-21-00
 ALL  ú ú C03.1 Page 501 ú Jul 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
TASK 77-21-00-735-009-C00
 3. System Test - EGT Indication System
___________________________________
 A. General
 (1)  
The accuracy test finds the errors in the EGT indication system from the airplane wiring resistance.

 (2)  
The correct insulation resistance of the circuit makes the accuracy of the EGT indication possible.

 (a)  The system components such as the thermocouple probe and the thermocouple cable are exposed to high temperature conditions during engine operation.
 (b) Moisture, carbon deposits and dirt on the thermocouple probe, ú leads and cable connectors can affect the EGT signal. ú ú NOTE:____If dirty mark noticed, clean the connectors with ú isopropyl alcohol CP1041 or stoddard solvent CP2011. ú
 B. Equipment
 (1)  
For the EGT accuracy test.

 (a)  
Test Set, Digital Temperature -Model TT1200,
 Model TT1000A (Optional)
 Barfield,
 4101 NW 29th St, Miami FL 33142

 (b)  
Millivolt Source (Alternate)
　
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