B. Do a minimum idle check (Ref. AMM TASK 71-00-00-710-006).
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TASK 73-00-00-810-868 Disagree between the Idle Positions of the Two Engines
1. Possible Causes
_______________
- aircraft wiring and connectors
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
ASM 73-25/08 ASM 73-25/10
3. Fault Confirmation
__________________
A. Not applicable, you cannot confirm this fault on the ground.
4. Fault Isolation
_______________
A. If the fault symptom is identified by the crew observation: one engine is at approach idle while the other one is at modulated idle during descent:
(1) Do a check to make sure that the EIU of the engine which is at approach idle is not faulty.
(2) Do a check of the aircraft wiring and connectors between the SFCC (21CV) (22CV)/EIU (1KS1) (1KS2)/and the ECU (4000KS) of the engine which is at approach idle (Ref. ASM 73-25/08) and (Ref. ASM 73-25/10).
B. After the subsequent flight, make sure that the fault does not continue.
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TASK 73-00-00-810-869
Loss of the Fuel Flow or/and Fuel Used Indication on Engine 1 or 2
1. Possible Causes
_______________
- DMC-2 (1WT2)
- DMC-1 (1WT1)
- harness J13
- ECU (4000KS)
- fuel flow transmitter
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION
-------------------------------------------------------------------------------
AMM 31-63-34-000-001 Removal of the DMC (1WT1,1WT2,1WT3)
AMM 31-63-34-400-001 Installation of the DMC (1WT1,1WT2,1WT3)
AMM 73-21-50-000-046 Removal of the HJ13 Harness
AMM 73-21-50-400-046 Installation of the HJ13 Harness
AMM 73-21-60-000-001 Removal of the Electronic Control Unit (ECU)(4000KS)
AMM 73-21-60-400-001 Installation of the Electronic Control Unit
(ECU)(4000KS)
AMM 73-31-10-000-002 Removal of the Fuel Flow Transmitter
AMM 73-31-10-400-002 Installation of the Fuel Flow Transmitter
ASM 73-25/17
3. Fault Confirmation
__________________
A. Check for the fuel flow or/and the fuel used indication
NOTE : During descent with engine normal operation, HMU PN 8061-534 and
____ R ECU post SB 73-1080, the Fuel Flow indication can be lost for up R to 2 minutes. In this case if no faults linked with the fuel
system is recorded in the PFR then no maintenance action is requeried.
(1) Do a check for the fuel flow or/and the fuel used XX indication on the ECAM display unit with the DMC3 switched on.
4. Fault Isolation
_______________
A. If the fuel used indication is not XX on the lower ECAM display unit with the DMC3 switched on:
(1) Replace the DMC-2 (1WT2) (Ref. AMM TASK 31-63-34-000-001) (Ref. AMM TASK 31-63-34-400-001).
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B. If the fuel flow indication is not XX on the upper ECAM display unit with the DMC3 switched on:
(1) Replace the DMC-1 (1WT1) (Ref. AMM TASK 31-63-34-000-001) and (Ref. AMM TASK 31-63-34-400-001).
C. If the fuel flow or/and fuel used indication is XX on the ECAM display unit with the DMC3 switched on:
(1) Do a check for open or short to ground at pins J13/1, 2, 3, 6 of the harness J13 between the ECU (4000KS) and the fuel flow transmitter (Ref. ASM 73-25/17).
(a) If the wiring is not correct:
- repair the above wiring.
(b) If the wiring is correct:
- disconnect the harness J13 from the ECU (4000KS) and do a check of the ECU cable resistance between: . pins 2 and 3 (250 to 350 ohms) . pins 3 and 6 (250 to 350 ohms) . pins 1 and 2 (> 10 megohms) . pin 2 and the ground (> 10 megohms).
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