(b) If the fault continues:
- replace the HMU (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
R (c) If the fault continues:
- replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
B. Do the test given in Para. 3.A.
(1) No additional maintenance action is required if the fault is not confirmed.
(2) Repeat the fault isolation procedure if the fault continues.
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TASK 75-22-00-810-806
Failure of the LPTC Valve on Engine 2
1. Possible Causes
_______________
- LPTC valve
- HMU
- ECU (4000KS)
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION
-------------------------------------------------------------------------------
AMM 73-21-10-000-002 Removal 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 75-22-10-000-002 Removal of the Low Pressure Turbine Active Clearance Control (LPTACC) Valve AMM 75-22-10-400-002 Installation of the Low Pressure Turbine Active Clearance Control (LPTACC) Valve
3. Fault Confirmation
__________________
A. Do the operational test of the FADEC 2A on the ground (with engine motoring) (Ref. AMM TASK 73-29-00-710-040).
4. Fault Isolation
_______________
A. This fault is generated if the actual valve position disagrees with the demanded valve position for a set time interval.
R (1) If the failure message LPTC VLV (POS), HMU is not confirmed: R
R (a) No maintenance action is required.
R (2) If the failure message LPTC VLV (POS), HMU is not confirmed but is R repetitive:
NOTE : No maintenance action is required unless the fault becomes too
____
repetitive.
- do the following steps until the fault is corrected.
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(a) Replace the LPTC valve (Ref. AMM TASK 75-22-10-000-002) and (Ref. AMM TASK 75-22-10-400-002).
R (b) If the fault continues during the subsequent flights:
- replace the HMU (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
R (c) If the fault continues during the subsequent flights:
- replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
(3) If the failure message LPTC VLV (POS), HMU is confirmed:
(a) Replace the LPTC valve (Ref. AMM TASK 75-22-10-000-002) and (Ref. AMM TASK 75-22-10-400-002).
(b) If the fault continues:
- replace the HMU (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
R (c) If the fault continues:
- replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
B. Do the test given in Para. 3.A.
(1) No additional maintenance action is required if the fault is not confirmed.
(2) Repeat the fault isolation procedure if the fault continues.
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R TASK 75-22-00-810-807
R Loss of the Feedback Signals from the LPTC Valve - Engine 1 - Channel A and R Channel B
R 1. Possible Causes
_______________
R - LPTC valve R - ECU (4000KS) R - harness J11 R - harness CJ11R R - harness J12 R - harness CJ12R R - harness HJ11 R - harness HJ12
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