DOC AIRBUS | TSM A320FSpurious Valve Movements
TASK 28-15-00-810-816-A
Spurious Valve Movements
A. Fixtures, Tools, Test and Support Equipment
B. Referenced Information
3. Fault Confirmation
Subtask 28-15-00-710-065-C ** ON A/C NOT FOR ALL
Subtask 28-15-00-810-065-C ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:28:31 UTC
Spurious Valve Movements
WARNING:
OBEY THE FUEL SAFETY PROCEDURES.
1. Possible CausesRELAY-L WING TK LOW LEVEL CHANNEL A (5QP) - 103VU126 RELAY-R WING TK LOW LEVEL CHANNEL B (6QP) - 103VU126 RELAY-L WING TK LOW LEVEL CHANNEL B (7QP) - 103VU126 RELAY-R WING TK LOW LEVEL CHANNEL A (8QP) - 103VU126 RELAY-L OR R REAR XFR VALVE OPEN LATCH (13QP) - 103VU126 RELAY-R OR R FWD XFR VALVE OPEN LATCH (14QP) - 103VU126
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | POWER SUPPLY UNIT 150A/CONTINUOUSLY - DC, VARIABLE |
| REFERENCE | DESIGNATION |
|---|---|
| AMM 28-46-00-740-001 | Functional (BITE) Test |
Subtask 28-15-00-710-065-C ** ON A/C NOT FOR ALL
A. Due to the spurious nature of this failure it is not possible to do a Fault Confirmation in the normal sense.
(1) To open and close ICTVs, and check the system operation:
(a) On the ECAM CONTROL PANEL:
(c) Read Steps (d), (e), and (f) before starting same.
(d) Do the Power Up Functional (BITE) Test of the FLSS AMM 28-46-00-740-001.
OR (if the FQIC is already powered).
Reset the FQIC. (Open, then after 5 seconds, close the two C/Bs 1QT and 2QT).
Reset the C/B 8QT.
(f) Make sure the intercell transfer valve symbol for each wing is seen to open and then close during the BITE Test.
(2) If this is:
(a) the first in flight occurence of this failure:
4. Fault Isolation(1) To open and close ICTVs, and check the system operation:
(a) On the ECAM CONTROL PANEL:
- push (in) the FUEL system page P/BSW.
(c) Read Steps (d), (e), and (f) before starting same.
(d) Do the Power Up Functional (BITE) Test of the FLSS AMM 28-46-00-740-001.
OR (if the FQIC is already powered).
Reset the FQIC. (Open, then after 5 seconds, close the two C/Bs 1QT and 2QT).
Reset the C/B 8QT.
NOTE: The ICTVs are not tested by the CFDS(FUEL) - COMMAND FLSS BITE menu option.
NOTE: The left and right wing inner cells must contain more than 1500kg(3300lb) of fuel for the ICTVs to be tested. Refuel inner cells to greater than this level if necessary.
NOTE: The intercell transfer valves (ICTVs) are motor driven and the power for these circuits is derived from the main power. The ICTVs are immobilized on battery power.
(e) Observe the ECAM lower display (SD page) while the FQIC/FLSS BITE Test is in progress. (f) Make sure the intercell transfer valve symbol for each wing is seen to open and then close during the BITE Test.
(2) If this is:
(a) the first in flight occurence of this failure:
- maintenance steps are not necessary.
- do Para. 4.A.
Subtask 28-15-00-810-065-C ** ON A/C NOT FOR ALL
A. Remove the relays 5QP, 6QP, 7QP, and 8QP, one at a time and carry out the procedure that follows:
(1) If this is:
(a) The first Trouble-shooting attempt:
(3) Carefully examine the relay for visible damage or blackened pins.
(4) If the relay is damaged or marked replace the relay.
(5) At an electrical test facility using a POWER SUPPLY UNIT 150A/CONTINUOUSLY - DC, VARIABLE:
(a) Set PSU to 28VDC.
(b) Connect positive supply to pin X1 (marked with colored bead).
(c) Connect negative supply to pin X2.
(d) Reduce the PSU voltage to zero (0 VDC).
(e) Gradually increase the voltage until the relay contacts close (indicated by a clicking sound).
(f) Make sure the contacts close before the voltage reaches 19.8VDC.
(g) Gradually reduce the voltage to zero (0 VDC).
(h) Make sure the contacts open before the coil voltage reaches 2VDC.
(i) Switch off the PSU.
(j) Disconnect the relay coil from the PSU.
(k) With a multimeter measure the resistance of the relay coil, between pins X1 and X2.
(l) Make sure the resistance of the coil is between 288 and 352 ohms.
(m) Measure the contact resistance of the two sets of contacts with the relay:
(6) Replace the relay if any measurements taken/made in Para. 4.A.(5) are outside the specification given.
(7) If a relay is replaced in Para. 4.A.(6), replace the related latch relay as shown in the table that follows:
(9) If no fault was found with relays 5QP, 6QP, 7QP, or 8QP, remove relays 13QP, and 14QP, one at a time and continue.
(10) Remove the relay from its location (socket).
(11) Carefully examine the relay for visible damage or blackened pins.
(12) If the relay is damaged or marked replace the relay.
(13) Measure the contact resistance of the two sets of contacts with the relay not energized.
(15) Replace the relay if any measurements taken/made are outside the specification given.
(16) Do the test given in Para. 3.A.
(17) Refit the relay in its location (socket) if it passes all sections of the specification given.
(18) Do the test given in Para. 3.A.
(19) If no specific relay failure can be found or the fault returns on subsequent flight(s), replace all these relays as follows:
(1) If this is:
(a) The first Trouble-shooting attempt:
- do investigative Trouble-shooting starting with Step (2).
- do Trouble-shooting by substitution, Step (19).
(3) Carefully examine the relay for visible damage or blackened pins.
(4) If the relay is damaged or marked replace the relay.
(5) At an electrical test facility using a POWER SUPPLY UNIT 150A/CONTINUOUSLY - DC, VARIABLE:
(a) Set PSU to 28VDC.
(b) Connect positive supply to pin X1 (marked with colored bead).
(c) Connect negative supply to pin X2.
(d) Reduce the PSU voltage to zero (0 VDC).
(e) Gradually increase the voltage until the relay contacts close (indicated by a clicking sound).
(f) Make sure the contacts close before the voltage reaches 19.8VDC.
(g) Gradually reduce the voltage to zero (0 VDC).
(h) Make sure the contacts open before the coil voltage reaches 2VDC.
(i) Switch off the PSU.
(j) Disconnect the relay coil from the PSU.
(k) With a multimeter measure the resistance of the relay coil, between pins X1 and X2.
(l) Make sure the resistance of the coil is between 288 and 352 ohms.
(m) Measure the contact resistance of the two sets of contacts with the relay:
- energized, between pins A2 to A1, and B2 to B1, using PSU connected as in Steps (5)(a) and (5)(b).
- not energized, between pins A2 to A3, and B2 to B3.
(6) Replace the relay if any measurements taken/made in Para. 4.A.(5) are outside the specification given.
(7) If a relay is replaced in Para. 4.A.(6), replace the related latch relay as shown in the table that follows:
| RELAY REPLACED | LATCH RELAY TO BE REPLACED |
|---|---|
| 5QP | 13QP |
| 6QP | 13QP |
| 7QP | 14QP |
| 8QP | 14QP |
NOTE: The action called for in Para. 4.A.(7) is necessary to make sure there is no residual contact damage.
(8) Do the test given in Para. 3.A. (9) If no fault was found with relays 5QP, 6QP, 7QP, or 8QP, remove relays 13QP, and 14QP, one at a time and continue.
(10) Remove the relay from its location (socket).
(11) Carefully examine the relay for visible damage or blackened pins.
(12) If the relay is damaged or marked replace the relay.
(13) Measure the contact resistance of the two sets of contacts with the relay not energized.
NOTE: The energized contacts are not used.
(14) Make sure the contact resistance is less than 0.1 ohms. (15) Replace the relay if any measurements taken/made are outside the specification given.
(16) Do the test given in Para. 3.A.
(17) Refit the relay in its location (socket) if it passes all sections of the specification given.
(18) Do the test given in Para. 3.A.
(19) If no specific relay failure can be found or the fault returns on subsequent flight(s), replace all these relays as follows:
RELAY-L WING TK LOW LEVEL CHANNEL A (5QP) - 103VU126 RELAY-R WING TK LOW LEVEL CHANNEL B (6QP) - 103VU126 RELAY-L WING TK LOW LEVEL CHANNEL B (7QP) - 103VU126 RELAY-R WING TK LOW LEVEL CHANNEL A (8QP) - 103VU126 RELAY-L OR R REAR XFR VALVE OPEN LATCH (13QP) - 103VU126 RELAY-R OR R FWD XFR VALVE OPEN LATCH (14QP) - 103VU126 .