Message Name:

L ITT CH B WRG/PROBE RNG MA

Message Code:

7327229LBR

Associated CAS:

EEC software C6 & C7

None

EEC software C8 & X

L 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
• Left 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.

   1. If damage or defect are found, 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 P1047 and the bypass duct connector P1032 and J1032. Disconnect the interface wiring at the terminal blocks TB2215 and TB2216, and the ground connector GC2203. Perform a visual inspection of the associated wiring and connectors for damage between the connectors and the terminal blocks.
   NOTE: Look specially for signs of chafing adjacent to clip locations, condition of connector pins and wiring kink or strain.

   1. If defects are found, 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 TB2215 and TB2216 (Alumel and Chromel terminal lugs) and the connector P1032 that follows:

   From	To	Result
   TB2215	P1032-16
   TB2216	P1032-17

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

5. Perform a continuity check between the connectors J1032 and P1047 that follows:

   From	To	Result
   J1032-16	P1047-50
   J1032-17	P1047-29

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