R  T495 Thermocouple Wiring Harness Figure 001
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R  T495 Thermocouple Wiring Harness Electrical Diagram Figure 002
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 (4) The lower extension lead has:

 - One rigid metal tube (Con-o-clad), equipped at each end with a mobile elbow-connector for connection to the main junction box assembly, and to the three-probe thermocouple lead assembly.

 (5) The main junction box assembly has:

 - Two rigid metal tubes (Con-o-clad), each equipped at one end with a mobile elbow-connector to the related two-probe lead assembly, and at the other end to a junction box. The junction box is equipped with two receptacles connectors for connection to the extension leads and one interface receptacle connector.
 C. The electromotive force is averaged first in each of the individual lead assembly (2 probes and 3 probes), then in the main junction box assembly at the level of the interface connector. The resultant averaged electromotive force is then sent to the ECU through the CJ13 harness and the HJ13 harness.
 2. EGT indication
______________
 **ON A/C 001-049, 051-099, 101-105, 151-199, 201-299, 301-302,
 (Ref. Fig. 003)
R **ON A/C 106-149, 303-399, 401-499,
 (Ref. Fig. 003A)
 **ON A/C ALL
 The EGT indication appears on the upper display unit of the ECAM system.
 The ECAM provides the EGT indication :
 - in analog form thru a pointer which deflects in front of a dial,

 - in digital form, in the lower section of the dial.
 The indication is normally green.
 The index is displayed in amber above 915 deg. C (or above 725 deg. C during
 start sequence).
 The index and the numerical value become red above 950 deg. C, the MASTER
 CAUT light comes on accompanied by the single chime, the following messages
 appear on the ECAM :

 - ENG 1(2) EGT OVERLIMIT

 - THR LEVER 1(2)...BELOW LIMIT
 If the EGT has exceeded 950 deg. C:

 - the maximum value reached is memorized,

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 Upper Display Unit of the ECAM System - EGT Indication
 Figure 003

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 Upper Display Unit of the ECAM System - EGT Indication
 Figure 003A

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 - a small red line remains positioned on the analog scale, at that value (max pointer). The red line will disappear after a new take off or maintenance action through the MCDU. Above 970 deg. C the messages displayed on the ECAM become:
 - ENG 1(2) EGT OVERLIMIT

 - THR LEVER 1(2)...IDLE

 - ENG MASTER 1(2)...OFF

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 T495 THERMOCOUPLE - REMOVAL/INSTALLATION
________________________________________ TASK 77-21-10-000-008 Removal of the Upper Extension Lead
 1. Reason for the Job

__________________
 Self Explanatory

 2. Job Set-up Information

______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific blanking plugs No specific caps No specific warning notice
 B. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
71-13-00-010-040 Opening of the Fan Cowl Doors 78-30-00-481-041 Make the Thrust Reverser Unserviceable for
 Maintenance 78-36-00-010-040 Opening of the Thrust Reverser Doors 77-21-10-991-303 Fig. 401
　
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