W DOC AIRBUS | TSM A320F

Refuel-Valve System Failure in Auto Control (Fails to Open)

TASK 28-25-00-810-802-A
Refuel-Valve System Failure in Auto Control (Fails to Open)

WARNING: OBEY THE FUEL SAFETY PROCEDURES.
WARNING: WHEN YOU DO WORK ON THE FUEL SYSTEM WIRING, YOU MUST USE TEST EQUIPMENT THAT IS APPROVED (REFER TO INTERNATIONAL OR NATIONAL SPECIFICATIONS FOR INTRINSICALLY SAFE TEST EQUIPMENT: EN50020, UL913 OR EQUIVALENT). TEST EQUIPMENT THAT IS NOT APPROVED CAN CAUSE FIRE OR AN EXPLOSION.
CAUTION: DO NOT LET THE REFUEL PRESSURE BE MORE THAN THE MAXIMUM SAFE PRESSURE OF 50psi (3.45bar).
1. Possible Causes
  • PRESELECTOR-FUEL QUANTITY, MULTI TANK [5QT]
  • FQIC [3QT]
  • RELAY-FQIC C/O SPLY (9QT) 103VU
  • aircraft wiring between the RELAY-FQIC C/O SPLY (9QT) 103VU terminal A2, and the FQIC (3QT) rack connector, contact 6D.
  • RELAY-REFUEL/DEFUEL CTL PNL DOOR POSITION (14QU) 92VU.
  • aircraft wiring between the FQIC (3QT) rack connector B, contact 7D and the RELAY-REFUEL/DEFUEL CTL PNL DOOR POSITION (14QU), terminal C1.
  • RELAY-REFUEL/DEFUEL CTL PNL DOOR POSITION (14QU) 92VU
  • aircraft wiring between the RELAY - L/G POSITION, SYS 1 (11GB) 95VU terminal B2 and the FQIC (3QT) rack connector B, contact 8D.
  • aircraft wiring between the FQIC (3QT) rack connector B, contact 2D, and the RELAY-R WING TK REFUEL VALVE CONTROL (16QU), terminal X1
  • aircraft wiring between the FQIC (3QT) rack connector B, contact 3D, and the RELAY-L WING TK REFUEL VALVE CONTROL (15QU), terminal X1
  • aircraft wiring between the FQIC rack connector B, contact 4D, and the RELAY - CTR TK VALVE CONTROL (17QU), terminal X1
  • aircraft wiring between the RELAY-REFUEL/DEFUEL CTL PNL DOOR POSITION (14QU) terminal B1, and the IND-FUEL QTY MULTI TANK (6QT) rack connector A, contact E
  • aircraft wiring between the FQIC (3QT) rack connector B, contact 11D and the IND-FUEL QTY MULTI TANK (6QT) rack connector A, contact N
  • SW-MODE SELECT/REFUEL/OFF/DEFUEL/XFR (3QU) 800VU
  • aircraft wiring between the SW-MODE SELECT/REFUEL/DEFUEL/XFR (3QU) terminal 3D and the FQIC (3QT) rack connector B, contact 6C
  • aircraft wiring between the RELAY - REFUEL/DEFUEL CTL PNL MULTI TANK (6QT) connector A, contact N
  • aircraft wiring between the FQIC (3QT) rack connector B, contact 11D and the IND -FUEL QTY MULTI TANK (6QT) rack connector A, contact N
  • aircraft wiring between the FQIC (3QT) rack connector B, contact 4E and the PRESELECTOR-FUEL QTY (5QT) connector A, contact M
  • aircraft wiring between the C/B-FUEL/FQI/CHANNEL 1 AND 2 (8QT) and the FQIC (3QT) rack connector B, contact 9D
  • SW-REFUEL VALVES/OPEN/NORMAL/SHUT, R WING TK (6QU) 800VU
  • aircraft wiring between the SW-REFUEL VALVES/OPEN/NORMAL/SHUT, R WING TK (6QU) terminal 3, and the FQIC (3QT) rack connector B, contact 2C
  • SW-REFUEL VALVES/OPEN/NORMAL/SHUT, L WING TK (5QU) 800VU
  • aircraft wiring between the SW-REFUEL VALVES/OPEN/NORMAL/SHUT, L WING TK (5QU) terminal 3, and the FQIC (3QT) rack connector B, contact 3C
  • SW-REFUEL VALVES/OPEN/NORMAL/SHUT, CTR TK (4QU) 800VU
  • aircraft wiring between the SW-REFUEL VALVES/OPEN/NORMAL/SHUT, CTR TK (4QU) terminal 3, and the FQIC (3QT) rack connector B, contact 4C
  • aircraft wiring between the FQIC (3QT) rack connector B, contact 2E and the PRESELECTOR-FUEL QTY (5QT) connector A, contact L
  • aircraft wiring between the FQIC (3QT) rack connector pin B05F and MSW-REFUEL.DEFUEL CTL DOOR POSITION (20QU)
  • aircraft wiring between the FQIC (3QT) rack connector pin B05F and RELAY-L/G POSITION, SYS 1 (11GB)
  • aircraft wiring between the RELAY-FQIC C/O SPLY (9QT) 103VU terminal A2, and the FQIC (3QT) rack connector, pin C08H.
  • aircraft wiring between the FQIC (3QT) rack connector AC, contact 8C and the RELAY-REFUEL/DEFUEL CTL PNL DOOR POSITION (14QU), terminal C1
  • aircraft wiring between the RELAY-REFUEL/DEFUEL CTL PNL DOOR POSITION (14QU) terminal B1, and the PRESELECTOR-FUEL QTY (5QT) rack connector A, contact E
  • aircraft wiring between the FQIC (3QT) rack connector AC, contact 7H and the PRESELECTOR-FUEL QTY (5QT) rack connector A, contact N
  • aircraft wiring between the SW-MODE SELECT/REFUEL/DEFUEL/XFR (3QU) terminal 3D and the FQIC (3QT) rack connector AC, contact 8E
  • PRESELECTOR-FUEL QTY (5QT)
  • IND-FUEL QTY MULTI TANK
  • aircraft wiring between the FQIC (3QT) rack connector AC, contact 4J and the PRESELECTOR-FUEL QTY (5QT) connector A, contact M
  • aircraft wiring between the C/B-FUEL/FQI/CHANNEL 1 AND 2 (8QT) and the FQIC (3QT) rack connector AC, contact 9E
  • aircraft wiring between the FQIC (3QT) rack connector AC, contact 4K and the PRESELECTOR-FUEL QTY (5QT) connector A, contact L
  • aircraft wiring between the SW-REFUEL VALVES/OPEN/NORMAL/SHUT, R WING TK (6QU) terminal 3, and the FQIC (3QT) rack connector AC, contact 8B
  • aircraft wiring between the SW-REFUEL VALVES/OPEN/NORMAL/SHUT, L WING TK (5QU) terminal 3, and the FQIC (3QT) rack connector AC, contact 8A
  • aircraft wiring between the SW-REFUEL VALVES/OPEN/NORMAL/SHUT, CTR TK (4QU) terminal 3, and the FQIC (3QT) rack connector AC, contact 9B
  • aircraft wiring between the FQIC (3QT) rack connector AC, contact 8J, and the RELAY-R WING TK REFUEL VALVE CONTROL (16QU), terminal X1
  • aircraft wiring between the FQIC (3QT) rack connector AC, contact 8K, and the RELAY-L WING TK REFUEL VALVE CONTROL (15QU), terminal X1
  • aircraft wiring between the FQIC (3QT) rack connector AC, contact 9J, and the RELAY-CTR TK VALVE CONTROL (17QU), terminal X1
  • aircraft wiring between the RELAY-REFUEL/DEFUEL CTL PNL DOOR POSITION (14QU) terminal B1, and the PRESELECTOR-FUEL QTY (5QT) rack connector A, terminal E
  • aircraft wiring between the FQIC (3QT) rack connector AC, contact 7H and the PRESELECTOR-FUEL QTY (5QT) rack connector A, terminal N
  • aircraft wiring between the PRESELECTOR-FUEL QTY (5QT) rack connector A, terminal S and the IND-FUEL QTY MULTI TANK (6QT) rack connector A, terminal S
  • aircraft wiring between the FQIC (3QT) rack connector AC, contact 4J and the PRESELECTOR-FUEL QTY (5QT) connector A, terminal M
  • aircraft wiring between the FQIC (3QT) rack connector AC, contact 4K and the PRESELECTOR-FUEL QTY (5QT) connector A, terminal L
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
TSM TASK 28-25-00-810-803-A
Refuel-Valve System Failure in Manual Control (Fails to Open)
AMM 12-11-28-650-003
Pressure Refuel with Automatic Control
AMM 12-11-28-650-004
Pressure Refuel with Manual Control
ASM 282501
ASM 284203
AMM 28-42-21-000-001
Removal of the Fuel Quantity Preselector
AMM 28-42-21-400-001
Installation of the Fuel Quantity Preselector
AMM 28-42-34-000-001
Removal of the Fuel Quantity-Indicating Computer (FQIC)
AMM 28-42-34-400-001
Installation of the Fuel Quantity-Indicating Computer (FQIC)
3. Fault Confirmation
Subtask 28-25-00-710-052-A
A. Make sure that the steps in the pressure refuel with auto control AMM 12-11-28-650-003, are complied with.
NOTE: The refuel valve will not open if the related tank is full of fuel.
4. Fault Isolation
Subtask 28-25-00-810-052-A ** ON A/C NOT FOR ALL
A. Procedure
   (1) If the fault continues:
   (2) If the fault continues with manual control:
   (3) If the refuel system operates correctly with manual control:
  • set the MCDU to:
     (a) The SYSTEM REPORT/TEST (FUEL).
     (b) The FQIS STATUS page.
   (4) Replace any LRUs listed on the FQIS STATUS page. Do the applicable troubleshooting procedure.
   (5) Do the pressure refuel with auto control.
   (6) If the fault continues:
     (a) Set the MCDU to INPUT PARAMETERS page 3, (the bit position - state cross-reference).
     (b) Examine the bit positions in the Table that follows:
       1 Bit position - State Cross-reference Table:
Bit position
Bit indication (active state)
FQIC pin allocation
Input/Output Voltage Level
Para No
R1
Battery power
B-6D I/P
Ground
(13)
R3
Refuel door open
B-7D I/P
Ground
(21)
R4
A/C on the ground
B-8D I/P
Ground
(29)
A5
Right refuel valve return
B-2D O/P
28VDC
(33)
B5
Left refuel valve return
B-3D O/P
28VDC
(36)
C5
Center refuel valve return
B-4D O/P
28VDC
(39)
R5
Refuel preselector Tx fault/
Not Powered
B-10D I/P
Open circuit
(45)
B6
Refuel selected
B-6C I/P
28VDC
(49)
R6
Indicator Tx fault/not powered
B-11D I/P
Open circuit
(56)
Q7
Refuel preselector decrement
B-4E I/P
Ground
(60)
R7
Refuel bus powered
B-9D I/P
28VDC
(63)
E8
Right refuel valve supplied
B-2C I/P
28VDC
(67)
F8
Left refuel valve supplied
B-3C I/P
28VDC
(71)
G8
Central refuel valve supplied
B-4C I/P
28VDC
(75)
Q8
Refuel preselector increment
B-2E I/P
Ground
(79)
NOTE: If an above signal is not correct, (a 1 not shown), Refer to the Para. shown in the end column.
NOTE: The preselector(s) INC/DEC switch input to the FQIC will only show a 1 while the INC/DEC switch is held in that position. Not at the central/rest position.
   (7) For the automatic refuel mode to be active check the conditions that follow in conjunction with the Table above:
     (a) The ground/flight discrete input is set to ground.
     (b) The refuel selected discrete is active. The logic for this, incorporated in the aircraft wiring, is condition 1_ or 2_ below:
       1 Refuel panel door open and the MODE SELECT switch on the external refuel panel set to REFUEL.
     (c) All the REFUEL VALVE switches are set to NORMAL.
   (8) For an automatic refuel to start make that the conditions are as follows:
     (a) Refuel bus power has been present for more than 7 seconds.
     (b) Automatic refuel mode is active (see Para. 7).
     (c) The displayed preselector FQ is 100kg (200lb) greater than the actual fuel quantity.
   (9) If the fault continues replace the PRESELECTOR-FUEL QUANTITY, MULTI TANK [5QT] AMM 28-42-21-000-001 and AMM 28-42-21-400-001.
   (10) Do the pressure refuel with auto control.
   (11) If the fault continues replace the FQIC [3QT] AMM 28-42-34-000-001 and AMM 28-42-34-400-001>.
   (12) Do the Pressure Refuel with Auto Control.
   (13) Do a check /replace the RELAY-FQIC C/O SPLY (9QT) 103VU ASM 284203.
   (14) Do a wiring check ASM 284203 of the aircraft wiring between the RELAY-FQIC C/O SPLY (9QT) 103VU terminal A2, and the FQIC (3QT) rack connector, contact 6D..
   (15) Repair all the unserviceable wiring and connectors.
   (16) Go to Para. 3.A.
   (17) Do a check ASM 284203/replace the RELAY-REFUEL/DEFUEL CTL PNL DOOR POSITION (14QU) 92VU..
   (18) Do a wiring check ASM 284203 of the aircraft wiring between the FQIC (3QT) rack connector B, contact 7D and the RELAY-REFUEL/DEFUEL CTL PNL DOOR POSITION (14QU), terminal C1..
   (19) Repair all the unserviceable wiring and connectors.
   (20) Go to Para. 3.A.
   (21) Do a check ASM 284203/replace the RELAY-REFUEL/DEFUEL CTL PNL DOOR POSITION (14QU) 92VU.
   (22) Do a wiring check ASM 284203 of the aircraft wiring between the RELAY - L/G POSITION, SYS 1 (11GB) 95VU terminal B2 and the FQIC (3QT) rack connector B, contact 8D..
   (23) Repair all the unserviceable wiring and connectors.
   (24) Go to Para. 3.A.
   (25) Do a wiring check ASM 282501 of the aircraft wiring between the FQIC (3QT) rack connector B, contact 2D, and the RELAY-R WING TK REFUEL VALVE CONTROL (16QU), terminal X1.
   (26) Repair all the unserviceable wiring and connectors.
   (27) Go to Para. 3.A.
   (28) Do a wiring check ASM 282501 of the aircraft wiring between the FQIC (3QT) rack connector B, contact 3D, and the RELAY-L WING TK REFUEL VALVE CONTROL (15QU), terminal X1.
   (29) Repair all the unserviceable wiring and connectors.
   (30) Go to Para. 3.A.
   (31) Do a wiring check ASM 282501 of the aircraft wiring between the FQIC rack connector B, contact 4D, and the RELAY - CTR TK VALVE CONTROL (17QU), terminal X1.
   (32) Repair all the unserviceable wiring and connectors.
   (33) Go to Para. 3.A.
   (34) Do a check ASM 284203/replace the RELAY-REFUEL/DEFUEL CTL PNL DOOR POSITION (14QU) 92VU.
   (35) Do a wiring check ASM 284203 of the:
  • aircraft wiring between the RELAY-REFUEL/DEFUEL CTL PNL DOOR POSITION (14QU) terminal B1, and the IND-FUEL QTY MULTI TANK (6QT) rack connector A, contact E
  • aircraft wiring between the FQIC (3QT) rack connector B, contact 11D and the IND-FUEL QTY MULTI TANK (6QT) rack connector A, contact N.
   (36) Repair all the unserviceable wiring and connectors.
   (37) Go to Para. 3.A.
   (38) Do a check ASM 282501/replace the SW-MODE SELECT/REFUEL/OFF/DEFUEL/XFR (3QU) 800VU.
   (39) Do a wiring check ASM 282501 of the aircraft wiring between the SW-MODE SELECT/REFUEL/DEFUEL/XFR (3QU) terminal 3D and the FQIC (3QT) rack connector B, contact 6C.
   (40) Repair all the unserviceable wiring and connectors.
   (41) Go to Para. 3.A.
   (42) Do a check ASM 284203/replace the RELAY-REFUEL/DEFUEL CTL PNL DOOR POSITION (14QU) 92VU.
   (43) Do a wiring check ASM 284203 of the:
  • aircraft wiring between the RELAY - REFUEL/DEFUEL CTL PNL MULTI TANK (6QT) connector A, contact N
  • aircraft wiring between the FQIC (3QT) rack connector B, contact 11D and the IND -FUEL QTY MULTI TANK (6QT) rack connector A, contact N.
   (44) Repair all the unserviceable wiring and connectors.
   (45) Go to Para. 3.A.
   (46) Do a wiring check ASM 284203 of the aircraft wiring between the FQIC (3QT) rack connector B, contact 4E and the PRESELECTOR-FUEL QTY (5QT) connector A, contact M.
   (47) Repair all the unserviceable wiring and connectors.
   (48) Go to Para. 3.A.
   (49) Do a check of :
  • the FUELLING BUS 2
  • the C/B-FUEL/FQI/CHANNEL 1 AND 2 (8QT) L26 at 121VU.
   (50) Do a wiring check ASM 284203 of the aircraft wiring between the C/B-FUEL/FQI/CHANNEL 1 AND 2 (8QT) and the FQIC (3QT) rack connector B, contact 9D.
   (50) Repair all the unserviceable wiring and connectors.
   (51) Go to Para. 3.A.
   (52) Do a check ASM 282501/replace the SW-REFUEL VALVES/OPEN/NORMAL/SHUT, R WING TK (6QU) 800VU.
   (53) Do a wiring check ASM 282501 of the aircraft wiring between the SW-REFUEL VALVES/OPEN/NORMAL/SHUT, R WING TK (6QU) terminal 3, and the FQIC (3QT) rack connector B, contact 2C.
   (54) Repair all the unserviceable wiring and connectors.
   (55) Go to Para. 3.A.
   (56) Do a check ASM 282501/replace the SW-REFUEL VALVES/OPEN/NORMAL/SHUT, L WING TK (5QU) 800VU.
   (57) Do a wiring check ASM 282501 of the aircraft wiring between the SW-REFUEL VALVES/OPEN/NORMAL/SHUT, L WING TK (5QU) terminal 3, and the FQIC (3QT) rack connector B, contact 3C.
   (58) Repair all the unserviceable wiring and connectors.
   (59) Go to Para. 3.A.
   (60) Check ASM 282501/replace the SW-REFUEL VALVES/OPEN/NORMAL/SHUT, CTR TK (4QU) 800VU.
   (61) Do a wiring check ASM 282501 of the aircraft wiring between the SW-REFUEL VALVES/OPEN/NORMAL/SHUT, CTR TK (4QU) terminal 3, and the FQIC (3QT) rack connector B, contact 4C.
   (62) Repair all the unserviceable wiring and connectors.
   (63) Go to Para. 3.A.
   (64) Do a wiring check ASM 284203 of the aircraft wiring between the FQIC (3QT) rack connector B, contact 2E and the PRESELECTOR-FUEL QTY (5QT) connector A, contact L.
   (65) Repair all the unserviceable wiring and connectors.
   (66) Go to Para. 3.A.
Subtask 28-25-00-810-052-F ** ON A/C NOT FOR ALL
A. Procedure
   (1) If the fault continues:
   (2) If the fault continues with manual control:
   (3) If the refuel system operates correctly with manual control:
  • set the MCDU to:
     (a) CFDS
     (b) The SYSTEM REPORT/TEST
     (c) FUEL
     (d) The FQIS STATUS page.
   (4) Replace any LRUs listed on the FQIS STATUS page. Do the applicable troubleshooting procedure.
   (5) Set the MCDU to the FLSS STATUS page.
   (6) If any of the LRUs that follow are shown, trouble shoot those LRU(s) before you start more steps:
  • L HI LEVEL SENSOR 17QJ1
  • R HI LEVEL SENSOR 17QJ2
  • C HI LEVEL SENSOR 20QJ.
   (7) Do the pressure refuel with auto control.
   (8) If the fault continues:
     (a) Set the MCDU to INPUT PARAMETERS page 3, (the bit position - state cross-reference).
     (b) Examine the bit positions in the Table 1 that follows:
NOTE: Not all the refuel signals are monitored by the FQIC to be shown on the INPUT PARAMETERS page 3.
The signals that are not shown on the INPUT PARAMETERS are identified in Table 2 with the Para number given for direct entry into the Trouble-shooting task.
       1 Table 1, Bit position - State Cross-reference:
Bit position
Bit indication (active state)
FQIC pin allocation
Input/Output Voltage Level
Para No
J2
Battery power
C08H I/P
Ground
(15)
H2
Refuel door open
C08C I/P
Ground
(23)
L2
Refuel Panel Presel Fault
C07H I/P
Open circuit
(34)
E2
Refuel selected
C08E I/P
28VDC
(38)
M2
Refuel Indicator Fault
C07G I/P
Open circuit
(45)
R2
Refuel preselector decrement
C04J I/P
Ground
(49)
D2
Refuel bus powered
C09E I/P
28VDC
(52)
Q2
Refuel preselector increment
C04K I/P
Ground
(56)
NOTE: If an above signal is not correct, (a 1 not shown), refer to the Para. shown in the end column.
NOTE: The preselector(s) INC/DEC switch input to the FQIC will only show a 1 while the INC/DEC switch is held in that position. Not at the central/rest position.
       2 Table 2, Refuel signals not shown on the INPUT PARAMETERS page 3:
Signal
FQIC pin allocation
Voltage Level (active state)
Para No
Aircraft Ground/Flight (GND/FLT)
Right refuel valve supplied
Left refuel valve supplied
Center refuel valve supplied
Right refuel valve return
Left refuel valve return
Center refuel valve return
B05F I/P
C08B I/P
C08A I/P
C09B I/P
C08J O/P
C08K O/P
C09J O/P
Ground (GND)
28VDC
28VDC
28VDC
28VDC
28VDC
28VDC
(9)(a)
(59)
(63)
(67)
(71)
(74)
(77)
   (9) For the automatic refuel mode to be active check the conditions that follow in conjunction with the Table 1 above or as directed:
     (a) The ground/flight discrete input is set to ground:
       1 Remove the FQIC (3QT) from its rack connector AMM 28-42-34-000-001.
       2 With a multimeter check to see if the FQIC rack connect pin B05F is at ground potential.
       3 If pin B05F is at ground potential reinstall the FQIC AMM 28-42-34-400-001.
       4 If the pin B05F is not at ground potential do a wiring check of the:
  • aircraft wiring between the FQIC (3QT) rack connector pin B05F and MSW-REFUEL.DEFUEL CTL DOOR POSITION (20QU), ASM 284203.
  • aircraft wiring between the FQIC (3QT) rack connector pin B05F and RELAY-L/G POSITION, SYS 1 (11GB), ASM 284203.
       5 Repair all wiring and connectors.
       6 Reinstall the FQIC (3QT) AMM 28-42-34-400-001.
     (b) The refuel selected discrete is active. The logic for this, incorporated in the aircraft wiring, is condition 1_ or 2_ below:
       1 Refuel panel door open and the MODE SELECT switch on the external refuel panel set to REFUEL.
     (c) All the REFUEL VALVE switches are set to NORMAL.
   (10) For an automatic refuel to start make that the conditions are as follows:
     (a) Refuel bus power has been present for sufficient time to allow the high level sensors to settle in thier true states.
     (b) Automatic refuel mode is active (see Para. 9).
     (c) The displayed preselector FQ is 100kg (200lb) greater than the actual fuel quantity.
   (11) If the fault continues replace the PRESELECTOR-FUEL QUANTITY, MULTI TANK [5QT] AMM 28-42-21-000-001 and AMM 28-42-21-400-001.
   (12) Do the pressure refuel with auto control.
   (13) If the fault continues replace the FQIC [3QT] AMM 28-42-34-000-001 and AMM 28-42-34-400-001>.
   (14) Do the Pressure Refuel with Auto Control.
   (15) Do a check /replace the RELAY-FQIC C/O SPLY (9QT) 103VU, ASM 284203.
   (16) Do a wiring check ASM 284203 of the aircraft wiring between the RELAY-FQIC C/O SPLY (9QT) 103VU terminal A2, and the FQIC (3QT) rack connector, pin C08H..
   (17) Repair all the unserviceable wiring and connectors.
   (18) Go to Para. 3.A.
   (19) Do a check /replace the RELAY-REFUEL/DEFUEL CTL PNL DOOR POSITION (14QU) 92VU, ASM 284203.
   (20) Do a wiring check ASM 284203 of the aircraft wiring between the FQIC (3QT) rack connector AC, contact 8C and the RELAY-REFUEL/DEFUEL CTL PNL DOOR POSITION (14QU), terminal C1.
   (21) Repair all the unserviceable wiring and connectors.
   (22) Go to Para. 3.A.
   (23) Do a check/replace the RELAY-REFUEL/DEFUEL CTL PNL DOOR POSITION (14QU) 92VU, ASM 284203.
   (24) Do a wiring check ASM 284203 of the:
  • aircraft wiring between the RELAY-REFUEL/DEFUEL CTL PNL DOOR POSITION (14QU) terminal B1, and the PRESELECTOR-FUEL QTY (5QT) rack connector A, contact E
  • aircraft wiring between the FQIC (3QT) rack connector AC, contact 7H and the PRESELECTOR-FUEL QTY (5QT) rack connector A, contact N.
   (25) Repair all the unserviceable wiring and connectors.
   (26) Go to Para. 3.A.
   (27) Do a check/replace the SW-MODE SELECT/REFUEL/OFF/DEFUEL/XFR (3QU) 800VU, ASM 282501.
   (28) Do a wiring check ASM 282501 of the aircraft wiring between the SW-MODE SELECT/REFUEL/DEFUEL/XFR (3QU) terminal 3D and the FQIC (3QT) rack connector AC, contact 8E.
   (29) Repair all the unserviceable wiring and connectors.
   (30) Go to Para. 3.A.
   (31) Do a check/replace the RELAY-REFUEL/DEFUEL CTL PNL DOOR POSITION (14QU) 92VU, ASM 284203.
   (32) Do a wiring check ASM 284203 of the:
  • aircraft wiring between the PRESELECTOR-FUEL QTY (5QT) rack connector A, terminal S and the IND-FUEL QTY MULTI TANK (6QT) rack connector A, terminal S.
   (33) Repair all the unserviceable wiring and connectors.
   (34) Go to Para. 3.A.
   (35) Do a wiring check ASM 284203 of the aircraft wiring between the FQIC (3QT) rack connector AC, contact 4J and the PRESELECTOR-FUEL QTY (5QT) connector A, contact M.
   (36) Repair all the unserviceable wiring and connectors.
   (37) Go to Para. 3.A.
   (38) Do a check of :
  • the FUELLING BUS 2
  • the C/B-FUEL/FQI/CHANNEL 1 AND 2 (8QT) L26 at 121VU.
   (39) Do a wiring check ASM 284203 of the aircraft wiring between the C/B-FUEL/FQI/CHANNEL 1 AND 2 (8QT) and the FQIC (3QT) rack connector AC, contact 9E.
   (40) Repair all the unserviceable wiring and connectors.
   (41) Go to Para. 3.A.
   (42) Do a wiring check ASM 284203 of the aircraft wiring between the FQIC (3QT) rack connector AC, contact 4K and the PRESELECTOR-FUEL QTY (5QT) connector A, contact L.
   (43) Repair all the unserviceable wiring and connectors.
   (44) Go to Para. 3.A.
   (45) Do a check ASM 282501/replace the SW-REFUEL VALVES/OPEN/NORMAL/SHUT, R WING TK (6QU) 800VU.
   (46) Do a wiring check ASM 282501 of the aircraft wiring between the SW-REFUEL VALVES/OPEN/NORMAL/SHUT, R WING TK (6QU) terminal 3, and the FQIC (3QT) rack connector AC, contact 8B.
   (47) Repair all the unserviceable wiring and connectors.
   (48) Go to Para. 3.A.
   (49) Do a check ASM 282501/replace the SW-REFUEL VALVES/OPEN/NORMAL/SHUT, L WING TK (5QU) 800VU.
   (50) Do a wiring check ASM 282501 of the aircraft wiring between the SW-REFUEL VALVES/OPEN/NORMAL/SHUT, L WING TK (5QU) terminal 3, and the FQIC (3QT) rack connector AC, contact 8A.
   (50) Repair all the unserviceable wiring and connectors.
   (51) Go to Para. 3.A.
   (52) Check ASM 282501/replace the SW-REFUEL VALVES/OPEN/NORMAL/SHUT, CTR TK (4QU) 800VU.
   (53) Do a wiring check ASM 282501 of the aircraft wiring between the SW-REFUEL VALVES/OPEN/NORMAL/SHUT, CTR TK (4QU) terminal 3, and the FQIC (3QT) rack connector AC, contact 9B.
   (54) Repair all the unserviceable wiring and connectors.
   (55) Go to Para. 3.A.
   (56) Do a wiring check ASM 282501 of the aircraft wiring between the FQIC (3QT) rack connector AC, contact 8J, and the RELAY-R WING TK REFUEL VALVE CONTROL (16QU), terminal X1.
   (57) Repair all the unserviceable wiring and connectors.
   (58) Go to Para. 3.A.
   (59) Do a wiring check ASM 282501 of the aircraft wiring between the FQIC (3QT) rack connector AC, contact 8K, and the RELAY-L WING TK REFUEL VALVE CONTROL (15QU), terminal X1.
   (60) Repair all the unserviceable wiring and connectors.
   (61) Go to Para. 3.A.
   (62) Do a wiring check ASM 282501 of the aircraft wiring between the FQIC (3QT) rack connector AC, contact 9J, and the RELAY-CTR TK VALVE CONTROL (17QU), terminal X1.
   (63) Repair all the unserviceable wiring and connectors.
   (64) Go to Para. 3.A.
Subtask 28-25-00-810-052-H ** ON A/C NOT FOR ALL
A. Procedure
   (1) If the fault continues:
   (2) If the fault continues with manual control:
   (3) If the refuel system operates correctly with manual control:
  • set the MCDU to:
     (a) The SYSTEM REPORT/TEST (FUEL).
     (b) The FQIS STATUS page.
   (4) Replace any LRUs listed on the FQIS STATUS page. Do the applicable troubleshooting procedure.
   (5) Do the pressure refuel with auto control.
   (6) If the fault continues:
     (a) Set the MCDU to INPUT PARAMETERS page 3, (the bit position - state cross-reference).
     (b) Examine the bit positions in the Table that follows:
       1 Bit position - State Cross-reference Table:
Bit position
Bit indication (active state)
FQIC pin allocation
Input/Output Voltage Level
Para No
R1
Battery power
B-6D I/P
Ground
(13)
R3
Refuel door open
B-7D I/P
Ground
(21)
R4
A/C on the ground
B-8D I/P
Ground
(29)
A5
Right refuel valve return
B-2D O/P
28VDC
(33)
B5
Left refuel valve return
B-3D O/P
28VDC
(36)
C5
Center refuel valve return
B-4D O/P
28VDC
(39)
R5
Refuel preselector Tx fault/
Not Powered
B-10D I/P
Open circuit
(45)
B6
Refuel selected
B-6C I/P
28VDC
(49)
R6
Indicator Tx fault/not powered
B-11D I/P
Open circuit
(56)
Q7
Refuel preselector decrement
B-4E I/P
Ground
(60)
R7
Refuel bus powered
B-9D I/P
28VDC
(63)
E8
Right refuel valve supplied
B-2C I/P
28VDC
(67)
F8
Left refuel valve supplied
B-3C I/P
28VDC
(71)
G8
Central refuel valve supplied
B-4C I/P
28VDC
(75)
Q8
Refuel preselector increment
B-2E I/P
Ground
(79)
NOTE: If an above signal is not correct, (a 1 not shown), Refer to the Para. shown in the end column.
NOTE: The preselector(s) INC/DEC switch input to the FQIC will only show a 1 while the INC/DEC switch is held in that position. Not at the central/rest position.
   (7) For the automatic refuel mode to be active check the conditions that follow in conjunction with the Table above:
     (a) The ground/flight discrete input is set to ground.
     (b) The refuel selected discrete is active. The logic for this, incorporated in the aircraft wiring, is condition 1_ or 2_ below:
       1 Refuel panel door open and the MODE SELECT switch on the external refuel panel set to REFUEL.
     (c) All the REFUEL VALVE switches are set to NORMAL.
   (8) For an automatic refuel to start make that the conditions are as follows:
     (a) Refuel bus power has been present for more than 7 seconds.
     (b) Automatic refuel mode is active (see Para. 7).
     (c) The displayed preselector FQ is 100kg (200lb) greater than the actual fuel quantity.
   (9) If the fault continues replace the PRESELECTOR-FUEL QUANTITY, MULTI TANK [5QT] AMM 28-42-21-000-001 and AMM 28-42-21-400-001.
   (10) Do the pressure refuel with auto control.
   (11) If the fault continues replace the FQIC [3QT] AMM 28-42-34-000-001 and AMM 28-42-34-400-001>.
   (12) Do the Pressure Refuel with Auto Control.
   (13) Do a check /replace the RELAY-FQIC C/O SPLY (9QT) 103VU ASM 284203.
   (14) Do a wiring check ASM 284203 of the aircraft wiring between the RELAY-FQIC C/O SPLY (9QT) 103VU terminal A2, and the FQIC (3QT) rack connector, contact 6D..
   (15) Repair all the unserviceable wiring and connectors.
   (16) Go to Para. 3.A.
   (17) Do a check ASM 284203/replace the RELAY-REFUEL/DEFUEL CTL PNL DOOR POSITION (14QU) 92VU..
   (18) Do a wiring check ASM 284203 of the aircraft wiring between the FQIC (3QT) rack connector B, contact 7D and the RELAY-REFUEL/DEFUEL CTL PNL DOOR POSITION (14QU), terminal C1..
   (19) Repair all the unserviceable wiring and connectors.
   (20) Go to Para. 3.A.
   (21) Do a check ASM 284203/replace the RELAY-REFUEL/DEFUEL CTL PNL DOOR POSITION (14QU) 92VU.
   (22) Do a wiring check ASM 284203 of the aircraft wiring between the RELAY - L/G POSITION, SYS 1 (11GB) 95VU terminal B2 and the FQIC (3QT) rack connector B, contact 8D..
   (23) Repair all the unserviceable wiring and connectors.
   (24) Go to Para. 3.A.
   (25) Do a wiring check ASM 282501 of the aircraft wiring between the FQIC (3QT) rack connector B, contact 2D, and the RELAY-R WING TK REFUEL VALVE CONTROL (16QU), terminal X1.
   (26) Repair all the unserviceable wiring and connectors.
   (27) Go to Para. 3.A.
   (28) Do a wiring check ASM 282501 of the aircraft wiring between the FQIC (3QT) rack connector B, contact 3D, and the RELAY-L WING TK REFUEL VALVE CONTROL (15QU), terminal X1.
   (29) Repair all the unserviceable wiring and connectors.
   (30) Go to Para. 3.A.
   (31) Do a wiring check ASM 282501 of the aircraft wiring between the FQIC rack connector B, contact 4D, and the RELAY - CTR TK VALVE CONTROL (17QU), terminal X1.
   (32) Repair all the unserviceable wiring and connectors.
   (33) Go to Para. 3.A.
   (34) Do a check ASM 284203/replace the RELAY-REFUEL/DEFUEL CTL PNL DOOR POSITION (14QU) 92VU.
   (35) Do a wiring check ASM 284203 of the:
  • aircraft wiring between the RELAY-REFUEL/DEFUEL CTL PNL DOOR POSITION (14QU) terminal B1, and the PRESELECTOR-FUEL QTY (5QT) rack connector A, terminal E
  • aircraft wiring between the FQIC (3QT) rack connector AC, contact 7H and the PRESELECTOR-FUEL QTY (5QT) rack connector A, terminal N.
   (36) Repair all the unserviceable wiring and connectors.
   (37) Go to Para. 3.A.
   (38) Do a check ASM 282501/replace the SW-MODE SELECT/REFUEL/OFF/DEFUEL/XFR (3QU) 800VU.
   (39) Do a wiring check ASM 282501 of the aircraft wiring between the SW-MODE SELECT/REFUEL/DEFUEL/XFR (3QU) terminal 3D and the FQIC (3QT) rack connector B, contact 6C.
   (40) Repair all the unserviceable wiring and connectors.
   (41) Go to Para. 3.A.
   (42) Do a check ASM 284203/replace the RELAY-REFUEL/DEFUEL CTL PNL DOOR POSITION (14QU) 92VU.
   (43) Do a wiring check ASM 284203 of the:
  • aircraft wiring between the PRESELECTOR-FUEL QTY (5QT) rack connector A, terminal S and the IND-FUEL QTY MULTI TANK (6QT) rack connector A, terminal S.
   (44) Repair all the unserviceable wiring and connectors.
   (45) Go to Para. 3.A.
   (46) Do a wiring check ASM 284203 of the aircraft wiring between the FQIC (3QT) rack connector AC, contact 4J and the PRESELECTOR-FUEL QTY (5QT) connector A, terminal M.
   (47) Repair all the unserviceable wiring and connectors.
   (48) Go to Para. 3.A.
   (49) Do a check of :
  • the FUELLING BUS 2
  • the C/B-FUEL/FQI/CHANNEL 1 AND 2 (8QT) L26 at 121VU.
   (50) Do a wiring check ASM 284203 of the aircraft wiring between the C/B-FUEL/FQI/CHANNEL 1 AND 2 (8QT) and the FQIC (3QT) rack connector B, contact 9D.
   (50) Repair all the unserviceable wiring and connectors.
   (51) Go to Para. 3.A.
   (52) Do a check ASM 282501/replace the SW-REFUEL VALVES/OPEN/NORMAL/SHUT, R WING TK (6QU) 800VU.
   (53) Do a wiring check ASM 282501 of the aircraft wiring between the SW-REFUEL VALVES/OPEN/NORMAL/SHUT, R WING TK (6QU) terminal 3, and the FQIC (3QT) rack connector B, contact 2C.
   (54) Repair all the unserviceable wiring and connectors.
   (55) Go to Para. 3.A.
   (56) Do a check ASM 282501/replace the SW-REFUEL VALVES/OPEN/NORMAL/SHUT, L WING TK (5QU) 800VU.
   (57) Do a wiring check ASM 282501 of the aircraft wiring between the SW-REFUEL VALVES/OPEN/NORMAL/SHUT, L WING TK (5QU) terminal 3, and the FQIC (3QT) rack connector B, contact 3C.
   (58) Repair all the unserviceable wiring and connectors.
   (59) Go to Para. 3.A.
   (60) Check ASM 282501/replace the SW-REFUEL VALVES/OPEN/NORMAL/SHUT, CTR TK (4QU) 800VU.
   (61) Do a wiring check ASM 282501 of the aircraft wiring between the SW-REFUEL VALVES/OPEN/NORMAL/SHUT, CTR TK (4QU) terminal 3, and the FQIC (3QT) rack connector B, contact 4C.
   (62) Repair all the unserviceable wiring and connectors.
   (63) Go to Para. 3.A.
   (64) Do a wiring check ASM 284203 of the aircraft wiring between the FQIC (3QT) rack connector AC, contact 4K and the PRESELECTOR-FUEL QTY (5QT) connector A, terminal L.
   (65) Repair all the unserviceable wiring and connectors.
   (66) Go to Para. 3.A.
[Rev.8 from Aug 2018] 2026.04.04 04:28:43 UTC
"WTRUIB" 2025