DOC AIRBUS | TSM A320FFuel - ACT Auto Transfer Fault - No Fuel Transfer From the ACT 1 When The Fuel In the ACT 2 Gets To Low Level, ACT 2 to 1 Change-over Fault In Auto Only
TASK 28-28-00-810-841-A-01
Fuel - ACT Auto Transfer Fault - No Fuel Transfer From the ACT 1 When The Fuel In the ACT 2 Gets To Low Level, ACT 2 to 1 Change-over Fault In Auto Only
A. Fixtures, Tools, Test and Support Equipment
B. Referenced Information
3. Fault Confirmation
Subtask 28-28-00-710-099-A ** ON A/C NOT FOR ALL
Subtask 28-28-00-810-116-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:28:53 UTC
Fuel - ACT Auto Transfer Fault - No Fuel Transfer From the ACT 1 When The Fuel In the ACT 2 Gets To Low Level, ACT 2 to 1 Change-over Fault In Auto Only
WARNING:
OBEY THE FUEL SAFETY PROCEDURES.
1. Possible Causes- aircraft wiring
- FLSCU 3 [47QJ]
- PROBE-FQI NO 1, ACT2 [65QT2]
- PROBE-FQI NO 2, ACT2 [66QT2]
- Relay-Panel 802VU
- RELAY-AUTO/MANUAL TRANSFER, ACT [23QH]
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| RIN28108706000 | 1 | TESTBOX-ACT 802VU |
| REFERENCE | DESIGNATION |
|---|---|
| TSM TASK 28-28-00-810-807-A | Fuel - ACT 2 Sequence Failure |
| TSM TASK 28-28-00-810-807-A-01 | Fuel - ACT 2 Sequence Failure (802VU ACT Relay Testbox) |
| TSM TASK 28-46-00-810-834-A | ACT 2 - FLSCU-3 Channel LS8 - Low Level Sensor No. 1 Failure |
| TSM TASK 28-46-00-810-835-A | ACT 2 - FLSCU-3 Channel LS2 - Low Level Sensor No. 2 Failure |
| ESPM 2053210 | |
| AMM 28-28-00-710-004 | Operational Test of the ACT Automatic Transfer System |
| ASM 282803 |
Subtask 28-28-00-710-099-A ** ON A/C NOT FOR ALL
A. Test
(1) If the automatic fuel transfer, stops when the ACT 2 gets to low level, do the steps that follow:
(b) Push (in) the P/BSW-24QH (to set the ACT transfer mode to MANUAL).
(c) Look at the ECAM FUEL page for the items that follow:
1 As specified in step (c)
a Do Para. 4.A - For FLSCU-3, ACT 2 low level sensor channel outputs to the relay-panel 802VU troubleshooting and th
b Do Para. 4.B. - If a serviceable spare relay-panel 802VU is available.
c Do Para. 4.C. - If a serviceable spare relay-panel 802VU is not available - for internal troubleshooting of ACT 2 low level sensor automatic/manual (series/parrallel) relay switching.
2 Not as specified in step (b) and remain unchanged, do ACT 2 Manual Transfer/Sequence Failure (On The Ground) (Ref. TSM TASK 28-28-00-810-807).
4. Fault Isolation(1) If the automatic fuel transfer, stops when the ACT 2 gets to low level, do the steps that follow:
NOTE: During an automatic ACT fuel transfer the outputs, from the FLSCU-3, ACT 2, two low level sensor channels, are connected in series to the control logic of the relay-panel 802VU. If all the usable fuel from ACT 2 has been transfered a fault, in one of the items that follow, can cause the automatic fuel transfer to stop (at that point in the sequence):
During a manual ACT fuel transfer the same two low level sensor outputs from the FLSCU-3 are connected in parallel. The output from one sensor (at low level) is sufficient to give an empty signal (a ground) to the control logic and cause the fuel transfer to changeover from ACT 2 to ACT 1.
The trouble-shooting logic assumes that there is only one fault at a given time.
(a) Connect the RIN28108706000 TESTBOX-ACT 802VU to the RELAY PANEL (802VU): - the FLSCU-3 (47QJ) ACT 2 low level sensor channel LS2 - 66QT2
- the FLSCU-3 (47QJ) ACT 2 low level sensor channel LS8 - 65QT2
- the ground input to FLSCU-3, pin 9A (low level sensor channel LS2 - 66QT2)
- the aircraft wiring between the FLSCU-3 and the relay-panel 802VU (related low level sensor channel outputs)
- the related low level relay contacts and the (series) wiring connection between the contacts, inside the relay-panel (800VU).
During a manual ACT fuel transfer the same two low level sensor outputs from the FLSCU-3 are connected in parallel. The output from one sensor (at low level) is sufficient to give an empty signal (a ground) to the control logic and cause the fuel transfer to changeover from ACT 2 to ACT 1.
The trouble-shooting logic assumes that there is only one fault at a given time.
- Use a clamp to connect the test box to the nearest bonding cable to electrically ground it.
NOTE: The lights on the test box will come on if there is 28VDC on the applicable pin.
1 Use the RIN28108706000 TESTBOX-ACT 802VU to monitor the Low Level ACT2 (LS2) LOW and the LOW Level ACT2 (LS8) lights. (b) Push (in) the P/BSW-24QH (to set the ACT transfer mode to MANUAL).
(c) Look at the ECAM FUEL page for the items that follow:
- the green triangular ACT transfer symbol changes from open to filled
- the fuel quantity of the ACT 1 starts to decrease
- the fuel quantity of the center tank starts to increase by a similar amount.
1 As specified in step (c)
a Do Para. 4.A - For FLSCU-3, ACT 2 low level sensor channel outputs to the relay-panel 802VU troubleshooting and th
b Do Para. 4.B. - If a serviceable spare relay-panel 802VU is available.
c Do Para. 4.C. - If a serviceable spare relay-panel 802VU is not available - for internal troubleshooting of ACT 2 low level sensor automatic/manual (series/parrallel) relay switching.
2 Not as specified in step (b) and remain unchanged, do ACT 2 Manual Transfer/Sequence Failure (On The Ground) (Ref. TSM TASK 28-28-00-810-807).
Subtask 28-28-00-810-116-A ** ON A/C NOT FOR ALL
A. Procedure
(1) Do the applicable FLSCU 3 [47QJ] , CHAN LS8 and LS2, ACT 2 low level outputs to the RELAY-PANEL (802VU) trouble-shooting as follows:
(b) Do the trouble-shooting task ACT 2 - FLSCU-3 (47QJ) Channel LS2 - Low Level Sensor No. 2 (66QT2) Failure (Ref. TSM TASK 28-46-00-810-835), part of PROBE-FQI NO 2, ACT2 [66QT2] .
(c) Do the Operational Test of the ACT Automatic Transfer System AMM 28-28-00-710-004.
Subtask 28-28-00-810-117-A ** ON A/C NOT FOR ALL (1) Do the applicable FLSCU 3 [47QJ] , CHAN LS8 and LS2, ACT 2 low level outputs to the RELAY-PANEL (802VU) trouble-shooting as follows:
NOTE: The lights on the ACT Testbox will show the FLSCU-3 channel that is at low level.
(a) Do the trouble-shooting task ACT 2 - FLSCU-3 (47QJ) Channel LS8 - Low Level Sensor No. 1 (65QT2) Failure (Ref. TSM TASK 28-46-00-810-834), part of PROBE-FQI NO 1, ACT2 [65QT2] . (b) Do the trouble-shooting task ACT 2 - FLSCU-3 (47QJ) Channel LS2 - Low Level Sensor No. 2 (66QT2) Failure (Ref. TSM TASK 28-46-00-810-835), part of PROBE-FQI NO 2, ACT2 [66QT2] .
(c) Do the Operational Test of the ACT Automatic Transfer System AMM 28-28-00-710-004.
B. Procedure - Relay-Panel 802VU (R and I) if a serviceable spare is available
(1) Temporarily replace the relay-panel 802VU with a serviceable spare item.
(3) If the ACT automatic transfer:
(a) Is serviceable:
1 Procedure (Option) 1
a Complete the installation of the serviceable spare relay-panel 802VU.
2 Procedure (Option) 2
a Remove the serviceable spare relay-panel 802VU installed in step (1).
b Install the original relay-panel 802VU.
c Do the Para. 4.C. and trouble-shoot the ACT 2, low level sensors, relay switching in the original relay-panel 802VU.
Subtask 28-28-00-810-118-A ** ON A/C NOT FOR ALL (1) Temporarily replace the relay-panel 802VU with a serviceable spare item.
NOTE: The step (1) has been included because it quickly lets you see the condition (serviceable or unserviceable) of the original relay-panel 802VU.
(2) Do the Operational Test of the ACT Automatic Transfer System AMM 28-28-00-710-004. (3) If the ACT automatic transfer:
(a) Is serviceable:
1 Procedure (Option) 1
a Complete the installation of the serviceable spare relay-panel 802VU.
2 Procedure (Option) 2
a Remove the serviceable spare relay-panel 802VU installed in step (1).
b Install the original relay-panel 802VU.
c Do the Para. 4.C. and trouble-shoot the ACT 2, low level sensors, relay switching in the original relay-panel 802VU.
C. Procedure - Relay Panel 802VU Internal Troubleshooting
ACT 2 - Low Level Sensors Automatic/Manual (Series/Parrallel) Relay Switching
(1) Do a check of ASM 282803 and replace, if necessary, the RELAY-AUTO/MANUAL TRANSFER, ACT [23QH] .
(a) Do a check of the RELAY-PANEL (802VU) wiring ASM 282803 between the connector to relay and connector to connector lines, as shown in the table that follows:
(b) Repair all the unserviceable wiring and connectors ESPM 2053210.
(c) Do the Operational Test of the ACT Automatic Transfer System AMM 28-28-00-710-004.
ACT 2 - Low Level Sensors Automatic/Manual (Series/Parrallel) Relay Switching
(1) Do a check of ASM 282803 and replace, if necessary, the RELAY-AUTO/MANUAL TRANSFER, ACT [23QH] .
(a) Do a check of the RELAY-PANEL (802VU) wiring ASM 282803 between the connector to relay and connector to connector lines, as shown in the table that follows:
NOTE: The circuit connections shown in the table are abbreviated, for example:
- the connector 4065VC, pin D is shown as 4065VC-D
- the RELAY-LO LVL SENSE, ACT 2 (14QH), terminal X2 is shown as RL 14QH-X2.
| CONNECTOR-PIN | RELAY-TERMINAL | TO RELAY-TERMINAL | CONNECTOR-PIN |
|---|---|---|---|
| 4065VC-D | RL 14QH-X2 | ||
| 4065VC-D | RL 23QH-D1 | ||
| 4065VC-C | RL 23QH-D2 | ||
| 4065VC-C | 4068VC-B | ||
| 4065VC-B | RL 23QH-C2 | ||
| 4065VC-B | 4068VC-A | ||
| RL 23QH-C3 | RL 23QH-D3 |
(c) Do the Operational Test of the ACT Automatic Transfer System AMM 28-28-00-710-004.