W DOC AIRBUS | TSM A320F

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

TASK 28-25-00-810-803-A
Refuel-Valve System Failure in Manual 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
  • L(R) HI LEVEL SENSOR 17QJ1(2)
  • SENSOR-HIGH LEVEL, CHANNEL A [20QJ]
  • C/B-FUEL/RFL/DFL/SPLY [2QU]
  • aircraft wiring
  • CTL PNL-REFUEL/DEFUEL [800VU]
  • SW-MODE SELECT/REFUEL/OFF/DEFUEL/XFR [3QU]
  • FLSCU-1 [7QJ]
  • FLSCU-2 [9QJ]
  • soleniod valve
  • VALVE-REFUEL, L WING TK [7QU]
  • VALVE-REFUEL, R WING TK [8QU]
  • VALVE-REFUEL, CTR TK [10QU]
  • RELAY-L WING TK REFUEL VALVE CONTROL [15QU]
  • RELAY-R WING TK REFUEL VALVE CONTROL [16QU]
  • RELAY-CTR TK REFUEL VALVE CONTROL [17QU]
  • applicable diodes (part of diode module 78VD)
  • SW-REFUEL VALVES/OPEN/NORM/SHUT, L WING TK [5QU]
  • SW-REFUEL VALVES/OPEN/NORM/SHUT, R WING TK [6QU]
  • SW-REFUEL VALVES/OPEN/NORM/SHUT, CTR TK [4QU]
  • CANISTER-REFUEL VALVE, L WING TK [19QM]
  • CANISTER-REFUEL VALVE, R WING TK [20QM]
  • CANISTER-REFUEL VALVE, CTR TK [88QM]
  • REFUEL DIFFUSER ASSEMBLY - WING TANK
  • REFUEL DIFFUSER ASSEMBLY - CENTER TANK
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
AR
MULTIMETER - STANDARD
 B. Referenced Information
REFERENCE
DESIGNATION
TSM TASK 24-67-00-810-801-A
Refueling not Possible
TSM TASK 28-46-00-810-803-A
L(R) High Level Sensor 17QJ1(2)
TSM TASK 28-46-00-810-805-A
Center Tank High Level Sensor 20QJ
AMM 12-11-28-650-004
Pressure Refuel with Manual Control
AMM 12-11-28-650-005
Pressure Refuel without Electrical Power
ASM 282501
ASM 282503
AMM 28-25-42-000-001
Removal of the Refuel Diffuser Assembly - Wing Tanks
AMM 28-25-42-000-002
Removal of the Refuel Diffuser Assembly - Center Tank
AMM 28-25-42-400-001
Installation of the Refuel Diffuser Assembly - Wing Tanks
AMM 28-25-42-400-002
Installation of the Refuel Diffuser Assembly - Center Tank
AMM 28-25-51-000-001
Removal of the Refuel Valve
AMM 28-25-51-000-002
Removal of the Refuel Valve
AMM 28-25-51-000-003
Removal of the Solenoid Valve
AMM 28-25-51-400-001
Installation of the Refuel Valve
AMM 28-25-51-400-002
Installation of the Refuel Valve
AMM 28-25-51-400-003
Installation of the Solenoid Valve
AMM 28-25-52-000-001
Removal of the Refuel Valve Canister
AMM 28-25-52-000-002
Removal of the Refuel Valve Canister
AMM 28-25-52-400-001
Installation of the Refuel Valve Canister
AMM 28-25-52-400-002
Installation of the Refuel Valve Canister
AMM 28-25-55-000-001
Removal of the Refuel Panel
AMM 28-25-55-400-001
Installation of the Refuel Panel
AMM 28-46-00-740-001
Functional (BITE) Test
AMM 28-46-34-000-001
Removal of the Fuel-Level Sensing Control-Unit (FLSCU)
AMM 28-46-34-400-001
Installation of the Fuel-Level Sensing Control-Unit (FLSCU)
3. Fault Confirmation
Subtask 28-25-00-865-051-A
A. Table of the circuit breakers referred to in this procedure:
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
121VUFUEL/HI/LVL/SPLY1QJL25
121VUFUEL/RFL/DFL/SPLY2QUL24
Subtask 28-25-00-710-051-B
B. Test
   (1) Make sure that you obey the steps in the pressure refuel with manual control AMM 12-11-28-650-004.
NOTE: A refuel valve will not open if the related tank is full of fuel. This is done to prevent a fuel spillage.
   (2) Make sure that the C/Bs that follow are closed:
  • C/B-FUEL/HI/LVL/SUPPLY (1QJ) - supplies 28VDC to the FLSCU-1 and 2 high level sensor channels
  • C/B-FUEL/RFL/DFL/SUPPLY (2QU) - supplies 28VDC to the refuel valves.
NOTE: The refuel valves (all) will not open if the 28VDC, 501PP FUELLING BUS is not powered. This is because the Fuel Level Sensing System (FLSS) high level channels (all) will give false WET outputs when they are not powered (de-energized condition).
   (3) If during the test of the CTL PNL-REFUEL/DEFUEL (800VU), the HI LVL lights fail to operate as specified:
  • refer to, LOCAL WARNING INDICATORS that show and do the applicable trouble-shooting procedure.
   (4) Look at the STATUS REPORT (BITE) of the FLSS AMM 28-46-00-740-001.
   (5) If the FUEL LEVEL SENSING message, L(R) HI LEVEL SENSOR 17QJ1(2) is given:
   (6) If the FUEL LEVEL SENSING message, SENSOR-HIGH LEVEL, CHANNEL A [20QJ] is given:
   (7) If, in Manual Refuel all the refuel valves fail to open:
  • go to Para. 4.A.
   (8) If, in Manual Refuel one refuel valve fails to open:
  • use the related manual plunger to attempt to continue the refuel as given in the procedure for Pressure Refuel without Electrical Power AMM 12-11-28-650-005.
   (9) If, during the time the related refuel valve manual plunger is held pushed in:
     (a) The applicable refuel valve opens and the refuel continues:
  • go to Para. 4.B.
     (b) The applicable refuel valve does not open and fuel cannot be put into the related fuel tank:
  • go to Para. 4.C.
4. Fault Isolation
Subtask 28-25-00-810-051-A
A. Procedure - In Manual Refuel All Refuel Valves Fail To Open
   (1) Remove the CTL PNL-REFUEL/DEFUEL (800VU) and disconnect the two connectors 4023VC-A and 4024VC-A AMM 28-25-55-000-001.
   (2) Use a MULTIMETER - STANDARD to do a test ASM 282501 to see if 28VDC is available between pin <G (+ve), of the end connector 4023VC-A, and a suitable ground.
   (3) If 28VDC is available at pin <G go to step (4). If 28VDC is not available at pin <G:
     (a) Do a check of and replace, if necessary, the C/B-FUEL/RFL/DFL/SPLY [2QU] .
     (b) If 28VDC is not available at the 501PP FUELING BUS 1:
     (c) Do a wiring check of the aircraft wiring ASM 282501 between:
  • the C/B-FUEL/RFL/DFL/SUPPLY (2QU) and the CTL PNL-REFUEL/DEFUEL (800VU) end connector 4023VC-A, pin <G.
     (d) Repair all the unserviceable wiring and connectors.
     (e) Install the CTL PNL-REFUEL/DEFUEL (800VU) AMM 28-25-55-400-001.
     (f) Do the Manual Refuel AMM 12-11-28-650-004.
   (4) Do the step (a) or (b) that follows:
     (a) Replace the CTL PNL-REFUEL/DEFUEL [800VU] with a serviceable item and install AMM 28-25-55-000-001 and AMM 28-25-55-400-001.
     (b) If due to airline operational conditions it is not possible to replace the CTL PNL-REFUEL/DEFUEL (800VU), do the internal Trouble-shooting ASM 282501 and ASM 282503 as follows:
       1 Remove the CTL PNL-REFUEL/DEFUEL (800VU) AMM 28-25-55-000-001.
       2 Do a check of and replace, if necessary, the SW-MODE SELECT/REFUEL/OFF/DEFUEL/XFR [3QU] .
       3 Do a check of the CTL PNL-REFUEL/DEFUEL (800VU) internal wiring ASM 282503 between:
  • the receptacle 4023VC, pin <G and terminal 1A, of the terminal block 4001VT
  • the terminal 1D, of the terminal block 4001VT and the terminal 1B, of the SW-MODE SELECT/REFUEL/OFF/DEFUEL/XFR (3QU)
  • the terminal 3B, of the SW-MODE SELECT/REFUEL/OFF/DEFUEL/XFR (3QU) and the terminal 3D, of the terminal block 4001VT.
NOTE: Terminal 3D, of the terminal block 4001VT is the last common point of the 28VDC supply. From this point the 28VDC supply divides into discrete routes to the applicable SW-REFUEL VALVES/OPEN/NORM/SHUT. The internal wiring checks for these wiring routes are given in Para. 4.B.
       4 Repair all the unserviceable wiring and connectors.
       5 Install the CTL PNL-REFUEL/DEFUEL (800VU) AMM 28-25-55-400-001.
       6 Do the manual refuel AMM 12-11-28-650-004.
Subtask 28-25-00-810-065-B
B. Procedure - In Manual Refuel One Refuel Valve Fails To Open But The Refuel Can Be Continued When The Related Refuel Valve Manual Plunger Is Held Pushed In
   (1) Interchange FLSCU-1 [7QJ] and FLSCU-2 [9QJ] AMM 28-46-34-000-001 and AMM 28-46-34-400-001.
NOTE: This step is necessary because the FLSS BITE test does not check the user outputs from the FLSS level sense channels.
     (a) If the fault moves with the FLSCU:
       1 Remove the FLSCU-1 [7QJ] and FLSCU-2 [9QJ] AMM 28-46-34-000-001.
       2 Install the serviceable FLSCU in its initial position AMM 28-46-34-400-001.
       3 Replace the unserviceable FLSCU AMM 28-46-34-400-001.
     (b) If the fault does not move with the FLSCU:
       1 Remove the FLSCU-1 [7QJ] and FLSCU-2 [9QJ] AMM 28-46-34-000-001.
       2 Install the FLSCU-1 [7QJ] and FLSCU-2 [9QJ] in its initial position AMM 28-46-34-400-001.
   (2) If the fault continues, disconnect the electrical supply connector, from the refuel valve, on the tank that fails to refuel.
   (3) Use a MULTIMETER - STANDARD to do a test, to see if 28VDC is available between pin A (+ve) and pin C (-ve) at the electrical supply connector ASM 282501.
   (4) If the 28VDC is not available in step (2), go to step (6). If the 28VDC is available, do a check of the resistance across the actuator:
     (a) Set the multimeter, to resistance and the 300 ohms range.
     (b) At the solenoid receptacle, connect the multimeter as follows:
  • the negative lead to pin A
  • the positive lead to pin C
     (c) Make sure that the resistance is between 200 and 220 ohms.
     (d) Reverse the multimeter connections:
  • the positive lead to pin A
  • the negative lead to pin C.
     (e) Make sure that the resistance is between 20 and 30 ohms.
NOTE: If the resistance values are the same in the two directions, there is a fault with the diode in the actuator.
   (5) If the tests done in step (4) are not as specified:
     (a) Replace the soleniod valve of the related VALVE-REFUEL, AMM 28-25-51-000-003 and AMM 28-25-51-400-003.
     (b) If the fault continues replace the VALVE-REFUEL, L WING TK [7QU] ( VALVE-REFUEL, R WING TK [8QU] ) AMM 28-25-51-000-001 and AMM 28-25-51-400-001, ( VALVE-REFUEL, CTR TK [10QU] ) AMM 28-25-51-000-002 and AMM 28-25-51-400-002, of the related tank.
   (6) If the tests done in step (4) are as specified:
     (a) Remove the solenoid valve AMM 28-25-51-000-003
     (b) Clean, check/replace the solenoid valve AMM 28-25-51-400-003.
     (c) If the fault continues check/replace the VALVE-REFUEL, L WING TK [7QU] ( VALVE-REFUEL, R WING TK [8QU] ) AMM 28-25-51-000-001 and AMM 28-25-51-400-001, ( VALVE-REFUEL, CTR TK [10QU] ) AMM 28-25-51-000-002 and AMM 28-25-51-400-002, of the related tank.
   (7) If 28VDC is not at pin A as measured in step (3):
     (a) Do a check of ASM 282501 and replace, if necessary:
  • the RELAY-L WING TK REFUEL VALVE CONTROL [15QU] / RELAY-R WING TK REFUEL VALVE CONTROL [16QU] / RELAY-CTR TK REFUEL VALVE CONTROL [17QU] as applicable.
NOTE: The quickest method/way to check the refuel valve control relays is to swap the one from the failed refuel valve system with one from a serviceable refuel valve system.
NOTE: If due to airline operational conditions it is not possible to replace the CTL PNL-REFUEL/DEFUEL (800VU) and internal Trouble-shooting is required, go to step (9).
  • the applicable diodes (part of diode module 78VD).
     (b) Use a multimeter to do a wiring check of the aircraft wiring ASM 282501 between:
  • the terminal A2, RELAY L/R(CTR) TK REFUEL VALVE CONTROL (15/16/17QU) and the related refuel valve end connector 7QU/8QU/10QU-A, pin A
  • the terminal X1, RELAY L/R(CTR) TK REFUEL VALVE CONTROL (15/16/17QU) and the related pin of end connector 4024VC-A, that connects to the CTL PNL-REFUEL/DEFUEL (800VU)
  • the terminal A1, RELAY L/R(CTR) TK REFUEL VALVE CONTROL (15/16/17QU) and the pin <G, of end connector 4024VC-A, that connects to the CTL PNL-REFUEL/DEFUEL (800VU)
  • the terminal X2, RELAY L/R(CTR) TK REFUEL VALVE CONTROL (15/16/17QU) and the applicable pin of rack connector to the FLSCU-1(2).
     (c) Repair all the unserviceable wiring and connectors.
   (8) Do the Manual Refuel AMM 12-11-28-650-004
   (9) CTL PNL-REFUEL/DEFUEL (800VU) Internal Trouble-shooting
ASM 282501 and ASM 282503
     (a) Remove the CTL PNL-REFUEL/DEFUEL (800VU) AMM 28-25-55-000-001.
     (b) Do a check of and replace, if necessary, the related:
  • SW-REFUEL VALVES/OPEN/NORM/SHUT, L WING TK [5QU] / SW-REFUEL VALVES/OPEN/NORM/SHUT, R WING TK [6QU] / SW-REFUEL VALVES/OPEN/NORM/SHUT, CTR TK [4QU] .
     (c) Do a check of the CTL PNL-REFUEL/DEFUEL (800VU) wiring between:
  • the related terminal of terminal block 4001VT and terminal 1, of the SW-REFUEL VALVES/OPEN/NORMAL/SHUT (4/5/6QU) for the related tank
  • the terminal 2, of the SW-REFUEL VALVES/OPEN/NORMAL/SHUT (4/5/6QU) and the related pin on the CTL PNL-REFUEL/DEFUEL (800VU) receptacle 4024VC.
NOTE: The wiring check up to terminal 3D, of the terminal block 4001VT is given in Para. 4.A.
     (d) Repair all the unserviceable wiring and connectors.
     (e) Install the CTL PNL-REFUEL/DEFUEL (800VU) AMM 28-25-55-400-001.
   (10) Do the Manual Refuel AMM 12-11-28-650-004.
Subtask 28-25-00-810-066-B
C. Procedure - In Manual Refuel (And Manual Plunger Control) The Applicable Refuel Valve Does Not Open And Fuel Cannot Be Put Into The Fuel Tank
   (1) Do a check off and replace, if necessary, the applicable items as follows:
     (a) The VALVE-REFUEL, L WING TK [7QU] ( VALVE-REFUEL, R WING TK [8QU] ) AMM 28-25-51-000-001 and AMM 28-25-51-400-001.
NOTE: The manual plunger pilot hole can become blocked. This will prevent the incoming fuel pressure from moving the main valve from closed to open.
     (b) The VALVE-REFUEL, CTR TK [10QU] AMM 28-25-51-000-002 and AMM 28-25-51-400-002.
NOTE: The manual plunger pilot hole can become blocked. This will prevent the incoming fuel pressure from moving the main valve from closed to open.
     (c) The CANISTER-REFUEL VALVE, L WING TK [19QM] ( CANISTER-REFUEL VALVE, R WING TK [20QM] ) AMM 28-25-52-000-001 and AMM 28-25-52-400-001.
     (d) The CANISTER-REFUEL VALVE, CTR TK [88QM] AMM 28-25-52-000-002 and AMM 28-25-52-400-002.
     (e) The REFUEL DIFFUSER ASSEMBLY - WING TANK AMM 28-25-42-000-001 and AMM 28-25-42-400-001.
     (f) The REFUEL DIFFUSER ASSEMBLY - CENTER TANK AMM 28-25-42-000-002 and AMM 28-25-42-400-002.
     (g) If the fault continues:
       1 Do a check of the fuel pipes between the applicable refuel valve and diffuser for a blockage.
       2 Repair all the unserviceable pipes and connections.
     (h) Do the Manual Refuel AMM 12-11-28-650-004.
[Rev.8 from Aug 2018] 2026.04.04 04:39:37 UTC
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