DOC AIRBUS | TSM A320FLoss of the Fuel Flow or/and Fuel Used Indication on Engine 1 and/or 2
TASK 73-00-00-810-869-A
Loss of the Fuel Flow or/and Fuel Used Indication on Engine 1 and/or 2
1. Possible Causes
2. Job Set-up Information
A. Referenced Information
3. Fault Confirmation
Subtask 73-00-00-710-289-A ** ON A/C NOT FOR ALL
Subtask 73-00-00-810-190-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:35:11 UTC
Loss of the Fuel Flow or/and Fuel Used Indication on Engine 1 and/or 2
1. Possible Causes
2. Job Set-up Information
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| AMM 31-63-34-000-001 | Removal of the DMC |
| AMM 31-63-34-400-001 | Installation of the DMC |
| AMM 73-21-50-000-012 | Removal of the J13 Harness |
| AMM 73-21-50-000-046 | Removal of the HJ13 Harness for SAC Engines |
| AMM 73-21-50-400-012 | Installation of the J13 Harness |
| AMM 73-21-50-400-046 | Installation of the HJ13 Harness for SAC Engines |
| 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) |
| ASM 732517 | |
| AMM 73-31-10-000-001 | Removal of the Fuel Flow Transmitter |
| AMM 73-31-10-000-002 | Removal of the Fuel Flow Transmitter |
| AMM 73-31-10-400-001 | Installation of the Fuel Flow Transmitter |
| AMM 73-31-10-400-002 | Installation of the Fuel Flow Transmitter |
Subtask 73-00-00-710-289-A ** ON A/C NOT FOR ALL
A. Check for the fuel flow or/and the fuel used indication
Subtask 73-00-00-710-289-B ** ON A/C NOT FOR ALL NOTE: During descent with engine normal operation, HMU P/N 1348M79P07, 1348M79P08, 1348M79P09, 1348M79P10, 1348M79P11, and 1348M79P12, associated with ECU post SB 73-1081/73-1083 (5AI or 5AI+), the Fuel Flow indication can be lost for a few minutes on Engine 1 and/or 2. In this case if no faults linked with the fuel system is recorded in the PFR then no maintenance action is required.
(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. A. Check for the fuel flow or/and the fuel used indication
4. Fault IsolationNOTE: During descent with engine normal operation, HMU P/N 1348M79P07, 1348M79P08, 1348M79P09, 1348M79P10, 1348M79P11, and 1348M79P12, associated with ECU post SB 73-1077 (5BK and on), the Fuel Flow indication can be lost for a few minutes on Engine 1 and/or 2. In this case if no faults linked with the fuel system is recorded in the PFR then no maintenance action is required.
(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. Subtask 73-00-00-810-190-A ** ON A/C NOT FOR ALL
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] AMM 31-63-34-000-001 AMM 31-63-34-400-001.
Subtask 73-00-00-810-118-A ** ON A/C NOT FOR ALL (1) Replace the DMC-2 [1WT2] AMM 31-63-34-000-001 AMM 31-63-34-400-001.
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] AMM 31-63-34-000-001 and AMM 31-63-34-400-001.
Subtask 73-00-00-810-119-A ** ON A/C NOT FOR ALL (1) Replace the DMC-1 [1WT1] AMM 31-63-34-000-001 and AMM 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 ASM 732517.
(a) If the wiring is not correct:
Subtask 73-00-00-810-119-B ** ON A/C NOT FOR ALL (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 ASM 732517.
(a) If the wiring is not correct:
- repair the above wiring.
- disconnect the harness J13 from the ECU (4000KS) and do a check of the ECU cable resistance between:
. pins 2 and 3 (60 to 90 ohms)
. pins 2 and 6 (140 to 210 ohms)
. pins 1 and 2 (> 10 megohms)
. pin 2 and the ground (> 10 megohms).
- replace the ECU [4000KS] AMM 73-21-60-000-001 and AMM 73-21-60-400-001.
- disconnect the harness J13 from the fuel flow transmitter and do a check of the transmitter resistance between:
. pins 1 and 2 (40 to 90 ohms)
. pins 2 and 3 (140 to 210 ohms)
. pins 1 and 4 (> 10 megohms)
. pin 1 and the ground (> 10 megohms).
- replace the harness J13 AMM 73-21-50-000-012 and AMM 73-21-50-400-012.
- replace the fuel flow transmitter AMM 73-31-10-000-001 and AMM 73-31-10-400-001.
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 ASM 732517.
(a) If the wiring is not correct:
Subtask 73-00-00-710-185-A ** ON A/C NOT FOR ALL (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 ASM 732517.
(a) If the wiring is not correct:
- repair the above wiring.
- 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).
- replace the ECU [4000KS] AMM 73-21-60-000-001 and AMM 73-21-60-400-001.
- disconnect the harness J13 from the fuel flow transmitter and do a check of the transmitter resistance between:
. pins 1 and 2 (250 to 350 ohms)
. pins 2 and 3 (250 to 350 ohms)
. pins 1 and 4 (> 10 megohms)
. pin 1 and the ground (> 10 megohms).
- replace the harness J13 AMM 73-21-50-000-046 and AMM 73-21-50-400-046.
- replace the fuel flow transmitter AMM 73-31-10-000-002 and AMM 73-31-10-400-002.
D. Do the test given in Para. 3.A.