DOC AIRBUS | TSM A320FFailure of the LPTC Valve on Engine 1
TASK 75-22-00-810-809-A
Failure of the LPTC Valve on Engine 1
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 75-22-00-710-064-A ** ON A/C NOT FOR ALL
Subtask 75-22-00-810-060-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:37:03 UTC
Failure of the LPTC Valve on Engine 1
1. Possible Causes
- LPTC valve
- HMU
- ECU [4000KS]
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| AMM 73-21-10-000-001 | Removal of the Hydromechanical Unit (HMU) |
| AMM 73-21-10-000-002 | Removal of the Hydromechanical Unit (HMU) |
| AMM 73-21-10-400-001 | Installation of the Hydromechanical Unit (HMU) |
| AMM 73-21-10-400-002 | Installation of the Hydromechanical Unit (HMU) |
| AMM 73-21-60-000-001 | Removal of the Electronic Control Unit (ECU) |
| AMM 73-21-60-400-001 | Installation of the Electronic Control Unit (ECU) |
| AMM 73-29-00-710-040 | Operational Test of the FADEC on the ground (with Engine Motoring) |
| AMM 75-22-10-000-001 | Removal of the Low Pressure Turbine Active Clearance Control Valve (LPTACC). |
| AMM 75-22-10-000-002 | Removal of the Low Pressure Turbine Active Clearance Control (LPTACC) Valve |
| AMM 75-22-10-400-001 | Installation of the Low Pressure Turbine Active Clearance Control Valve (LPTACC). |
| AMM 75-22-10-400-002 | Installation of the Low Pressure Turbine Active Clearance Control (LPTACC) Valve |
Subtask 75-22-00-710-064-A ** ON A/C NOT FOR ALL
A. Do the operational test of the FADEC 1B on the ground (with engine motoring) AMM 73-29-00-710-040.
Subtask 75-22-00-710-064-B ** ON A/C NOT FOR ALL A. Do the operational test of the FADEC 1B on the ground (with engine motoring) AMM 73-29-00-710-040.
4. Fault IsolationNOTE: If ECU 1820M36P02 or 1820M89P02 is installed, the confirmation test is not required.
Subtask 75-22-00-810-060-A ** ON A/C NOT FOR ALL
A. This fault is generated if the actual valve position disagrees with the demanded valve position for a set time interval.
(1) If the failure message LPTC VLV, HMU is not confirmed:
(a) No maintenance action is required.
(2) If the failure message LPTC VLV, HMU is not confirmed but the fault is intermittent:
(b) If the fault continues during the subsequent flights:
(a) Replace the LPTC valve AMM 75-22-10-000-001 and AMM 75-22-10-400-001.
(b) If the fault continues:
Subtask 75-22-00-810-060-B ** ON A/C NOT FOR ALL (1) If the failure message LPTC VLV, HMU is not confirmed:
(a) No maintenance action is required.
(2) If the failure message LPTC VLV, HMU is not confirmed but the fault is intermittent:
- do the following steps until the fault is corrected.
(b) If the fault continues during the subsequent flights:
- replace the HMU AMM 73-21-10-000-001 and AMM 73-21-10-400-001.
- replace the ECU [4000KS] AMM 73-21-60-000-001 and AMM 73-21-60-400-001.
(a) Replace the LPTC valve AMM 75-22-10-000-001 and AMM 75-22-10-400-001.
(b) If the fault continues:
- replace the HMU AMM 73-21-10-000-001 and AMM 73-21-10-400-001.
- replace the ECU (4000KS) AMM 73-21-60-000-001 and AMM 73-21-60-400-001.
A. This fault is generated if the actual valve position disagrees with the demanded valve position for a set time interval.
(1) If the failure message LPTC VLV (POS), HMU is not confirmed:
(a) No maintenance action is required.
(2) If the failure message LPTC VLV (POS), HMU is not confirmed but the fault is intermittent:
(b) If the fault continues during the subsequent flights:
(a) Replace the LPTC valve AMM 75-22-10-000-002 and AMM 75-22-10-400-002.
(b) If the fault continues:
Subtask 75-22-00-810-060-C ** ON A/C NOT FOR ALL (1) If the failure message LPTC VLV (POS), HMU is not confirmed:
(a) No maintenance action is required.
(2) If the failure message LPTC VLV (POS), HMU is not confirmed but the fault is intermittent:
- do the following steps until the fault is corrected.
(b) If the fault continues during the subsequent flights:
- replace the HMU AMM 73-21-10-000-002 and AMM 73-21-10-400-002.
- replace the ECU [4000KS] AMM 73-21-60-000-001 and AMM 73-21-60-400-001.
(a) Replace the LPTC valve AMM 75-22-10-000-002 and AMM 75-22-10-400-002.
(b) If the fault continues:
- replace the HMU AMM 73-21-10-000-002 and AMM 73-21-10-400-002.
- replace the ECU (4000KS) AMM 73-21-60-000-001 and AMM 73-21-60-400-001.
A. This fault is generated if the actual valve position disagrees with the demanded valve position for a set time interval.
(1) If the failure message LPTC VLV (POS), HMU is not confirmed:
(a) No maintenance action is required.
(2) If the failure message LPTC VLV (POS), HMU is not confirmed but the fault is intermittent:
(b) If the fault continues during the subsequent flights:
(a) Replace the LPTC valve AMM 75-22-10-000-001 and AMM 75-22-10-400-001.
(b) If the fault continues:
Subtask 75-22-00-710-065-A ** ON A/C NOT FOR ALL (1) If the failure message LPTC VLV (POS), HMU is not confirmed:
(a) No maintenance action is required.
(2) If the failure message LPTC VLV (POS), HMU is not confirmed but the fault is intermittent:
- do the following steps until the fault is corrected.
(b) If the fault continues during the subsequent flights:
- replace the HMU AMM 73-21-10-000-001 and AMM 73-21-10-400-001.
- replace the ECU [4000KS] AMM 73-21-60-000-001 and AMM 73-21-60-400-001.
(a) Replace the LPTC valve AMM 75-22-10-000-001 and AMM 75-22-10-400-001.
(b) If the fault continues:
- replace the HMU AMM 73-21-10-000-001 and AMM 73-21-10-400-001.
- replace the ECU (4000KS) AMM 73-21-60-000-001 and AMM 73-21-60-400-001.
B. Do the test given in Para. 3.A.