Message Name:

R ITT CH A WRG/PROBE RNG MA

Message Code:

7327228RBR

Associated CAS:

EEC software C6 & C7

None

 EEC software C8 & X

R FADEC FAULT
(ADVISORY)

There is an open or short circuit in the interface wiring. The Inter-Turbine Temperature (ITT) circuits are continuously monitored by the Full-Authority Digital Engine-Controller (FADEC).

• Inter-Turbine Temperature (ITT) Thermocouples
• Right Engine Electronic Controller (EEC)
• Associated Wiring

Advisory Wire/Service Bulletin: None

Full Throttle Blog/Forum Articles/Infoservice/Newsletter: None

Flight Operation Notifications Manual (FONM): None

NOTES:

• If lost of ITT indication on the EICAS display due to the CHA and/or CHB failure; Dashes will appear instead of the indication.

1. Perform a visual inspection of the ITT Thermocouple.
   NOTE: Look specially for signs of damage adjacent to clip locations and corrosion around the ceramic insulator. Refer to image below that shows clean and contaminated TGT Thermocouple.

   1. If damage or defect are found, rectify or repair as required and do close out.
   2. If damage or defect are not found, continue with next step.

2. Interchange EECs.

   1. If system checks are good, replace the defective EEC and do close out.
   2. If fault remains continue with the next step.

3. Disconnect the EEC connector (P1044) and the bypass duct connector (P1030 and J1030). Disconnect the interface wiring at the terminal blocks TB2112 and TB2113. Perform a visual inspection of the wiring and connectors for damage between the connectors and the terminal blocks.
   NOTE: Look for signs of chafing adjacent to clip locations, condition of connector pins and wiring kink or strain.

   1. If defects are found, rectify or repair as required and do close out.
   2. If defects are not found, continue with next step.

4. Perform a continuity check between the terminal blocks Chromel and Alumel terminal lugs (TB2112 and TB2113) and the connector P1030 as follows:

   From	To	Result
   TB2112	P1030-16
   TB2113	P1030-17

   1. If there is no continuity, repair defective wiring as required and do close out.
   2. If there is continuity, continue with next step.

5. Perform a continuity check between the connectors J1030 and P1044 as follows:

   From	To	Result
   J1030-16	P1044-50
   J1030-17	P1044-29

   1. If there is no continuity, repair defective wiring as required and do close out.
   2. If there is continuity, continue with next step.

6. Disconnect Thermocouple (Ladder) Harness from the Thermocouples.
   
7. Do wiring check of Thermocouple (Ladder) Harness for continuity.

   1. If Harness has continuity between all connection points replace the defective TGT Thermocouple.
   2. If Thermocouple Harness does not have continuity between connection points replace Thermocouple Harness. 

8. Make sure that the primary indication of ITT shows on the EICAS display.
9. Do close out.