DOC AIRBUS | TSM A320FLPC (2.5) Bleed Valve Actuator Position Error - Trach Check Channel B
TASK 75-32-00-810-847-A
LPC (2.5) Bleed Valve Actuator Position Error - Trach Check Channel B
1. Possible Causes
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Referenced Information
3. Fault Confirmation
Subtask 75-32-00-710-102-A ** ON A/C NOT FOR ALL
Subtask 75-32-00-860-065-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:41:25 UTC
LPC (2.5) Bleed Valve Actuator Position Error - Trach Check Channel B
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 73-21-00-710-809 | Test No.15 - Operation Test (Dry Motor) of the FADEC System Engine Actuators |
| 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 73-21-63-000-802 | Removal of the Electronic Engine Control (EEC) Wiring Harness (W03) |
| AMM 73-21-63-400-802 | Installation of the Electronic Engine Control (EEC) Wiring Harness (W03) |
| 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 75-32-01-000-801 | Removal of the Low Pressure Compressor (LPC) (2.5) Bleed Valve Actuator |
| AMM 75-32-01-200-801 | Mechanical Check of the Low Pressure Compressor (LPC) (2.5) Bleed Air System |
| AMM 75-32-01-400-801 | Installation of the Low Pressure Compressor (LPC) (2.5) Bleed Valve Actuator |
| 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 75-32-00-710-102-A ** ON A/C NOT FOR ALL
A. Do the FADEC system engine actuators test to confirm this fault AMM 73-21-00-710-809.
(a) If the LPC 2.5 bleed valve is binding, repair it or remove the engine from service.
(b) If no problems are found, examine the harnesses and electrical connectors as described in the component and harness intermittent fault isolation procedure (Ref. TSM TASK 71-00-00-810-835).
(c) If no problems are found, return the engine to service. Monitor the engine for reoccurring maintenance message.
1 If the fault message returns, replace ACTUATOR-LPC BLEED VALVE [4092KS] AMM 75-32-01-000-801 and AMM 75-32-01-400-801.
(2) If the maintenance message comes back (hard fault), go to the Para. Fault Isolation.
4. Fault IsolationNOTE: The Electronic Engine Control (EEC) channel B has detected that the Low Pressure Compressor (LPC) 2.5 bleed valve actuator is not able to move to its command position within an acceptable period of time. The LPC 2.5 bleed valve actuator is mounted on the aft side of the compressor intermediate case bulkhead located at the 10 o'clock position.
- 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).
NOTE: Position faults from fuel driven actuators may appear after servicing the engine fuel filter or other fuel system parts due to entrapped air in the system. Performing the FADEC system actuator test again will purge the air. If the actuator position faults do not clear after one or two actuator tests proceed to troubleshoot the system.
(1) If the maintenance message does not come back, do a check of the LPC 2.5 bleed system AMM 75-32-01-200-801. (a) If the LPC 2.5 bleed valve is binding, repair it or remove the engine from service.
(b) If no problems are found, examine the harnesses and electrical connectors as described in the component and harness intermittent fault isolation procedure (Ref. TSM TASK 71-00-00-810-835).
(c) If no problems are found, return the engine to service. Monitor the engine for reoccurring maintenance message.
1 If the fault message returns, replace ACTUATOR-LPC BLEED VALVE [4092KS] AMM 75-32-01-000-801 and AMM 75-32-01-400-801.
(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 75-32-00-810-104-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) Do a check of the LPC 2.5 bleed valve AMM 75-32-01-200-801.
(a) If the LPC 2.5 bleed valve is binding, repair it or remove the engine from service.
(3) If the fault continues:
(a) Replace ACTUATOR-LPC BLEED VALVE [4092KS] AMM 75-32-01-000-801 and AMM 75-32-01-400-801.
(b) Do the test given in Para. 3.
(4) Examine the W03 (4087KS) and W04 (4088KS) harnesses and connector P6 (4000KS-P6) - EEC (4000KS), interconnect P106 (4100VC-A)/J106 (4100VC) and connector P28 (4092KS-P28) - LPC 2.5 bleed valve actuator (4092KS), for problems which are possible between the EEC (4000KS) and the LPC 2.5 bleed valve actuator (4092KS).
(a) Inspect for harness damage.
(b) Inspect for loose or damaged connectors.
1 Replace W03 HARNESS [4087KS] AMM 73-21-63-000-802 and AMM 73-21-63-400-802, or
2 Replace W04 HARNESS [4088KS] AMM 73-21-64-000-802 and AMM 73-21-64-400-802.
3 Do the test given in Para. 3.
(5) If no problems are found with the harnesses, use a PLIERS - JAWED, SOFT to disconnect electrical connector P6 (4000KS-P6) from the EEC (4000KS), interconnect P106 (4100VC-A)/J106 (4100VC) and connector P28 (4092KS-P28) from the LPC 2.5 bleed valve actuator (4092KS).
(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 P6 (4000KS-P6) to the EEC (4000KS), interconnect P106 (4100VC-A)/J106 (4100VC) and connector P28 (4092KS-P28) to the LPC 2.5 valve actuator (4092KS).
(d) Do the test given in Para. 3.
(6) If the fault continues:
(a) Disconnect electrical connector P6 (4000KS-P6) from the EEC (4000KS), interconnect P106 (4100VC-A)/J106 (4100VC) and connector P28 (4092KS-P28) from the LPC 2.5 bleed valve actuator (4092KS). Use a MULTIMETER - STANDARD to test the LPC 2.5 bleed valve actuator (4092KS) Linear Variable Differential Transducer (LVDT) and Torque Motor (TM) circuits in the harnesses. Refer to Table 1 and Table 2. Look for:
1 Wire-to-wire shorts
2 Shorts to ground
3 Continuity (less than 5 ohms resistance).
Table 2: LPC 2.5 Bleed Valve Actuator (4092KS) LVDT Channel B Connector Contacts
(b) If a problem is found with the harnesses or connectors:
1 Replace W03 HARNESS [4087KS] AMM 73-21-63-000-802 and AMM 73-21-63-400-802, or
2 Replace W04 HARNESS [4088KS] AMM 73-21-64-000-802 and AMM 73-21-64-400-802.
3 Do the test given in Para. 3.
(7) If no problems are found with the harnesses or the fault continues:
(a) Replace
(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) Do a check of the LPC 2.5 bleed valve AMM 75-32-01-200-801.
(a) If the LPC 2.5 bleed valve is binding, repair it or remove the engine from service.
(3) If the fault continues:
(a) Replace ACTUATOR-LPC BLEED VALVE [4092KS] AMM 75-32-01-000-801 and AMM 75-32-01-400-801.
(b) Do the test given in Para. 3.
(4) Examine the W03 (4087KS) and W04 (4088KS) harnesses and connector P6 (4000KS-P6) - EEC (4000KS), interconnect P106 (4100VC-A)/J106 (4100VC) and connector P28 (4092KS-P28) - LPC 2.5 bleed valve actuator (4092KS), for problems which are possible between the EEC (4000KS) and the LPC 2.5 bleed valve actuator (4092KS).
(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 W03 HARNESS [4087KS] AMM 73-21-63-000-802 and AMM 73-21-63-400-802, or
2 Replace W04 HARNESS [4088KS] AMM 73-21-64-000-802 and AMM 73-21-64-400-802.
3 Do the test given in Para. 3.
(5) If no problems are found with the harnesses, use a PLIERS - JAWED, SOFT to disconnect electrical connector P6 (4000KS-P6) from the EEC (4000KS), interconnect P106 (4100VC-A)/J106 (4100VC) and connector P28 (4092KS-P28) from the LPC 2.5 bleed valve actuator (4092KS).
(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 P6 (4000KS-P6) to the EEC (4000KS), interconnect P106 (4100VC-A)/J106 (4100VC) and connector P28 (4092KS-P28) to the LPC 2.5 valve actuator (4092KS).
(d) Do the test given in Para. 3.
(6) If the fault continues:
(a) Disconnect electrical connector P6 (4000KS-P6) from the EEC (4000KS), interconnect P106 (4100VC-A)/J106 (4100VC) and connector P28 (4092KS-P28) from the LPC 2.5 bleed valve actuator (4092KS). Use a MULTIMETER - STANDARD to test the LPC 2.5 bleed valve actuator (4092KS) Linear Variable Differential Transducer (LVDT) and Torque Motor (TM) circuits in the harnesses. Refer to Table 1 and Table 2. 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: LPC 2.5 Bleed Valve Actuator (4092KS) TM Channel B Connector Contacts | W03 (4087KS) Harness P6 (4000KS-P6) EEC (4000KS) Connector Contacts | W03 (4087KS) Harness P106 (4100VC-A) Connector Contacts | W04 (4088KS) Harness J106 (4100VC) Connector Contacts | W04 (4088KS) Harness P28 (4092KS-P28) LPC 2.5 Bleed Valve Actuator (4092KS) Connector Contacts |
|---|---|---|---|
| Y | 8 | 8 | 11 |
| u | 9 | 9 | 12 |
Table 2: LPC 2.5 Bleed Valve Actuator (4092KS) LVDT Channel B Connector Contacts
| W03 (4087KS) Harness P6 (4000KS-P6) EEC (4000KS) Connector Contacts | W03 (4087KS) Harness P106 (4100VC-A) Connector Contacts | W04 (4088KS) Harness J106 (4100VC) Connector Contacts | W04 (4088KS) Harness P28 (4092KS-P28) 2.5 Bleed Valve Actuator (4092KS) Connector Contacts |
|---|---|---|---|
| X | 23 | 23 | 5 |
| W | 24 | 24 | 15 |
| s | 2 | 2 | 14 |
| FF | 3 | 3 | 3 |
| NN | 10 | 10 | 13 |
1 Replace W03 HARNESS [4087KS] AMM 73-21-63-000-802 and AMM 73-21-63-400-802, or
2 Replace W04 HARNESS [4088KS] AMM 73-21-64-000-802 and AMM 73-21-64-400-802.
3 Do the test given in Para. 3.
(7) If no problems are found with the harnesses or the fault continues:
(a) Replace
(b) Do the test given in Para. 3.
Subtask 75-32-00-860-065-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.