DOC AIRBUS | TSM A320FTemperature RTT Sensor Electrical Failure Channel A
TASK 73-13-00-810-805-A
Temperature RTT Sensor Electrical Failure Channel A
1. Possible Causes
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Referenced Information
3. Fault Confirmation
Subtask 73-13-00-710-054-A ** ON A/C NOT FOR ALL
Subtask 73-13-00-860-054-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:36:37 UTC
Temperature RTT Sensor Electrical Failure Channel A
1. Possible Causes
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | MULTIMETER - STANDARD |
| No specific | 1 | PLIERS - JAWED, SOFT |
| REFERENCE | DESIGNATION |
|---|---|
| TSM TASK 71-00-00-810-834-A | General Troubleshooting Guidelines for Additional Troubleshooting Information |
| TSM TASK 71-00-00-810-835-A | Component and Harness Intermittent Troubleshooting Procedure for Guidance Troubleshooting Intermittent Faults |
| AMM 70-70-00-910-803 | SPOP 6 - Cleaning of the Contact Points and Wiring Harnesses |
| AMM 73-13-03-000-801 | Removal of the Fuel Return To Tank (RTT) Valve |
| AMM 73-13-03-400-801 | Installation of the Fuel Return To Tank (RTT) Valve |
| AMM 73-21-00-710-806 | Test No.7 - EEC Operation Test (Self Test) |
| AMM 73-21-01-000-801 | Removal of the Electronic Engine Control (EEC) |
| AMM 73-21-01-400-801 | Installation of the Electronic Engine Control (EEC) |
| AMM 73-21-64-000-802 | Removal of the Electronic Engine Control (EEC) Wiring Harness (W04) |
| AMM 73-21-64-400-802 | Installation of the Electronic Engine Control (EEC) Wiring Harness (W04) |
| AMM 73-21-70-000-802 | Removal of the Electronic Engine Control (EEC) Wiring Harness (WC11) |
| AMM 73-21-70-400-802 | Installation of the Electronic Engine Control (EEC) Wiring Harness (WC11) |
| AMM 78-36-00-010-802 | Opening of the Thrust Reverser Cowl-Doors |
| AMM 78-36-00-410-802 | Closing of the Thrust Reverser Cowl-Doors |
EEC Wiring HarnessesSubtask 73-13-00-710-054-A ** ON A/C NOT FOR ALL
A. Do the EEC system interactive test to confirm this fault. Refer to FADEC self test AMM 73-21-00-710-806.
(a) If no problems are found, return the engine to service. Monitor the engine for reoccurring maintenance message. Do the component and harness maintenance message troubleshooting procedure to fix the fault (Ref. TSM TASK 71-00-00-810-835).
(2) If the maintenance message comes back (hard fault), go to the Para. Fault Isolation.
4. Fault IsolationNOTE: The Electronic Engine Control (EEC) channel A has detected the temperature sensor signal from the Return To Tank (RTT) valve is out of range or rate. The RTT temperature sensor is part of the RTT valve. The RTT valve is located on the thermal management system manifold at the 8 o'clock position aft of the main gearbox.
(1) If the maintenance message does not come back, examine the harness and electrical connectors as described in the component and harness intermittent fault isolation procedure (Ref. TSM TASK 71-00-00-810-835). - Refer to the general troubleshooting guidelines for additional troubleshooting information (Ref. TSM TASK 71-00-00-810-834).
- Refer to the component and harness intermittent troubleshooting procedure for guidance troubleshooting intermittent faults (Ref. TSM TASK 71-00-00-810-835).
(a) If no problems are found, return the engine to service. Monitor the engine for reoccurring maintenance message. Do the component and harness maintenance message troubleshooting procedure to fix the fault (Ref. TSM TASK 71-00-00-810-835).
(2) If the maintenance message comes back (hard fault), go to the Para. Fault Isolation.
WARNING:
BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AFTER SHUTDOWN. THE ENGINE CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS WARNING, INJURY CAN OCCUR.
WARNING:
REFER TO THE MSDS FOR ALL MATERIAL USED AND THE MANUFACTURER'S SAFETY INSTRUCTIONS FOR ALL EQUIPMENT USED. IF YOU DO NOT OBEY THIS WARNING, INJURY CAN OCCUR.
CAUTION:
MAKE SURE YOU REMOVE ELECTRICAL POWER FROM THE EEC BEFORE YOU REMOVE THE ELECTRICAL CONNECTORS. IF YOU DO NOT OBEY THIS INSTRUCTION, DAMAGE TO THE EEC CAN OCCUR.
Subtask 73-13-00-810-054-A ** ON A/C NOT FOR ALL A. If there is confirmation of the fault:
(1) Open the thrust reverser cowl-doors AMM 78-36-00-010-802.
(2) Examine the W04 (4088KS) and WC11 (4072KS) harnesses and connector P3 (4000KS-P3) - EEC (4000KS), interconnect J105 (4108VC)/P105 (4108VC-A) and connector P68 (4082KS- P68) - Fuel RTT valve (4082KS), for problems which are possible between the EEC (4000KS) and the fuel RTT valve (4082KS).
(a) Inspect for harness damage.
(b) Inspect for loose or damaged connectors.
1 Replace W04 HARNESS(4088KS) AMM 73-21-64-000-802 and AMM 73-21-64-400-802, or
2 Replace WC11 HARNESS-CORE(4072KS) AMM 73-21-70-000-802 and AMM 73-21-70-400-802.
3 Do the test given in Para. 3.
(3) If no problems are found with the harnesses, use a PLIERS - JAWED, SOFT to disconnect electrical connector P3 (4000KS-P3) from the EEC (4000KS), interconnect J105 (4108VC)/P105 (4108VC-A) and connector P68 (4082KS-P68) from the fuel RTT valve (4082KS).
(a) Examine the pins and sockets (contacts) for alignment and damage. Look for contacts pushed rearward into the connector face. Replace parts as necessary.
(b) Clean the contacts with contact cleaner and clean cloth per SPOP 6. Blow dry with air (at less than 30 psi) across the connector face AMM 70-70-00-910-803.
(c) Reconnect electrical connector P3 (4000KS-P3) to the EEC (4000KS), interconnect J105 (4108VC)/P105 (4108VC-A) and connector P68 (4082KS-P68) to the fuel RTT valve (4082KS).
(d) Do the test given in Para. 3.
(4) If the fault continues:
(a) Replace FUEL RETURN TO TANK MODULE [4082KS] AMM 73-13-03-000-801 and AMM 73-13-03-400-801.
(b) Do the test given in Para. 3.
(5) If the fault continues:
(a) Disconnect electrical connector P3 (4000KS-P3) from the EEC (4000KS), interconnect J105 (4108VC)/P105 (4108VC-A) and connector P68 (4082KS-P68) from the fuel RTT valve (4082KS). Use a MULTIMETER - STANDARD to test the RTT temperature sensor circuits in the harnesses. Refer to Table 1. Look for:
1 Wire-to-wire shorts
2 Shorts to ground
3 Continuity (less than 5 ohms resistance).
(b) If a problem is found with the harnesses or connectors:
1 Replace W04 HARNESS [4088KS] AMM 73-21-64-000-802 and AMM 73-21-64-400-802, or
2 Replace HARNESS-CORE,WC11 [4072KS] AMM 73-21-70-000-802 and AMM 73-21-70-400-802.
3 Do the test given in Para. 3.
(6) If the fault continues:
(a) Replace the
(b) Do the test given in Para. 3.
5. Close-up(1) Open the thrust reverser cowl-doors AMM 78-36-00-010-802.
(2) Examine the W04 (4088KS) and WC11 (4072KS) harnesses and connector P3 (4000KS-P3) - EEC (4000KS), interconnect J105 (4108VC)/P105 (4108VC-A) and connector P68 (4082KS- P68) - Fuel RTT valve (4082KS), for problems which are possible between the EEC (4000KS) and the fuel RTT valve (4082KS).
(a) Inspect for harness damage.
(b) Inspect for loose or damaged connectors.
NOTE: Loose connectors must be disconnected and examined for further wear or damage.
(c) If a problem is found with the harnesses or connectors: 1 Replace W04 HARNESS(4088KS) AMM 73-21-64-000-802 and AMM 73-21-64-400-802, or
2 Replace WC11 HARNESS-CORE(4072KS) AMM 73-21-70-000-802 and AMM 73-21-70-400-802.
3 Do the test given in Para. 3.
(3) If no problems are found with the harnesses, use a PLIERS - JAWED, SOFT to disconnect electrical connector P3 (4000KS-P3) from the EEC (4000KS), interconnect J105 (4108VC)/P105 (4108VC-A) and connector P68 (4082KS-P68) from the fuel RTT valve (4082KS).
(a) Examine the pins and sockets (contacts) for alignment and damage. Look for contacts pushed rearward into the connector face. Replace parts as necessary.
(b) Clean the contacts with contact cleaner and clean cloth per SPOP 6. Blow dry with air (at less than 30 psi) across the connector face AMM 70-70-00-910-803.
(c) Reconnect electrical connector P3 (4000KS-P3) to the EEC (4000KS), interconnect J105 (4108VC)/P105 (4108VC-A) and connector P68 (4082KS-P68) to the fuel RTT valve (4082KS).
(d) Do the test given in Para. 3.
(4) If the fault continues:
(a) Replace FUEL RETURN TO TANK MODULE [4082KS] AMM 73-13-03-000-801 and AMM 73-13-03-400-801.
(b) Do the test given in Para. 3.
(5) If the fault continues:
(a) Disconnect electrical connector P3 (4000KS-P3) from the EEC (4000KS), interconnect J105 (4108VC)/P105 (4108VC-A) and connector P68 (4082KS-P68) from the fuel RTT valve (4082KS). Use a MULTIMETER - STANDARD to test the RTT temperature sensor circuits in the harnesses. Refer to Table 1. Look for:
1 Wire-to-wire shorts
2 Shorts to ground
3 Continuity (less than 5 ohms resistance).
NOTE: A short to ground is found when the resistance is less than 100 000 (100K) ohms.
Table 1: RTT Valve Temperature Sensor Channel A Contacts | W04 (4088KS) Harness P3 (4000KS-P3) EEC (4000KS) Connector Contacts | W04 (4088KS) Harness J105 (4108VC) Connector Contacts | WC11 (4072KS) Harness P105 (4108VC-A) Connector Contacts | WC11 (4072KS) Harness P68 (4082KS-P68) RTT Valve (4082KS) Connector Contacts |
|---|---|---|---|
| y | 9 | 9 | 3 |
| g | 10 | 10 | 11 |
1 Replace W04 HARNESS [4088KS] AMM 73-21-64-000-802 and AMM 73-21-64-400-802, or
2 Replace HARNESS-CORE,WC11 [4072KS] AMM 73-21-70-000-802 and AMM 73-21-70-400-802.
3 Do the test given in Para. 3.
(6) If the fault continues:
(a) Replace the
(b) Do the test given in Para. 3.
Subtask 73-13-00-860-054-A ** ON A/C NOT FOR ALL
A. Put the aircraft back to its initial configuration.
(1) Make sure that the work area is clean and clear of tools and other items.
(a) Close the thrust reverser cowl-doors AMM 78-36-00-410-802.
(1) Make sure that the work area is clean and clear of tools and other items.
(a) Close the thrust reverser cowl-doors AMM 78-36-00-410-802.