R . pins 4 and 5 (80 to 109.5 ohms)
R . pins 6 and 7 (85 to 115 ohms)
R . pins 2 and 3 (85 to 115 ohms)
R . pins 4 and 1 (> 10 megohms)
R . pins 6 and 1 (> 10 megohms)
R . pins 2 and 1 (> 10 megohms)
R . pin 4 and the ground (> 10 megohms)
R . pin 6 and the ground (> 10 megohms)
R . pin 2 and the ground (> 10 megohms).
R 3_ If the resistance values are in the specified limits:
R - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001)
R and (Ref. AMM TASK 73-21-60-400-001).
R 4_ If the resistance values are out of the specified limits:
R - disconnect the HJ12 harness from the CJ12R harness located
R at the 6 o'clock junction box and do an electrical
R resistance test through the CJ12R harness between:
R . pins 20 and 21 (80 to 109.5 ohms)
R . pins 7 and 19 (85 to 115 ohms)
R . pins 2 and 9 (85 to 115 ohms)
R . pins 20 and 8 (> 10 megohms)
R . pins 7 and 8 (> 10 megohms)
R . pins 2 and 8 (> 10 megohms)
R . pin 20 and the ground (> 10 megohms)
R . pin 7 and the ground (> 10 megohms)
R . pin 2 and the ground (> 10 megohms).
R 5_ If the resistance values are in the specified limits:
R - replace the harness HJ12 (ECU to the 6 o'clock junction box)
R (Ref. AMM TASK 73-21-50-000-045) and (Ref. AMM TASK 73-21-
50-400-045).
R 6_ If the resistance values are out of the specified limits:
R - replace the harness CJ12R (Ref. AMM TASK 73-21-50-000-028)
R and (Ref. AMM TASK 73-21-50-400-028).
R
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R B. Do the test given in Para. 3.A.
R (1) No additional maintenance action is required if the fault is not
R confirmed.
R (2) Repeat the fault isolation procedure if the fault continues.
R
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TASK 75-22-00-810-805
Failure of the LPTC Valve on Engine 1
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 1A 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).
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