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Refuel (ACT 2) - Fails To Refuel In Auto Control

TASK 28-25-00-810-813-A
Refuel (ACT 2) - Fails To Refuel In Auto Control

1. Possible Causes
  • RELAY-CTL HI LVL, IND ACT2 (57QJ)
  • FQIC [3QT]
  • aircraft wiring
  • CTL PNL-REFUEL/DEFUEL [800VU]
  • [5QU]
  • [4QU]
  • [6QU]
  • CTL PNL-REFUEL/DEFUEL (ACT) [801VU]
  • SWITCH-REFUEL VALVE CONTROL, ACT [40QU]
  • SW-REFUEL VLV CTL ACT 2 (42QU)
  • [3QU]
  • PRESELECTOR-FUEL QUANTITY, MULTI TANK [5QT]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
TSM TASK 28-25-00-810-802-A
Refuel-Valve System Failure in Auto Control (Fails to Open)
TSM TASK 28-25-00-810-814-A
Refuel (Act 2) - Fails To Refuel In Manual Control
AMM 12-11-28-650-003
Pressure Refuel with Automatic Control
AMM 12-11-28-650-004
Pressure Refuel with Manual Control
AMM 28-25-00-710-003
Operational Test of the Refuel System
ASM 282501
ASM 282503
AMM 28-25-55-000-001
Removal of the Refuel Panel
AMM 28-25-55-400-001
Installation of the Refuel Panel
AMM 28-25-58-000-001
Removal of the Refuel Panel
AMM 28-25-58-400-001
Installation of the Refuel Panel
ASM 282801
ASM 282803
ASM 282804
AMM 28-42-00-740-003
Interrogation of the FQIS Input Parameters Pages
ASM 284203
ASM 284210
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)
ASM 284601
3. Fault Confirmation
Subtask 28-25-00-710-062-A ** ON A/C NOT FOR ALL
A. Test
   (1) Make sure you obey the steps in the Pressure Refuel with Automatic Control AMM 12-11-28-650-003.
NOTE: It is not possible to refuel the ACT 1 or the ACT 2 if the P/BSW-FUEL/ACT/AUTO (24QH) is set to the FWD (pushed in), manual transfer position.
NOTE: The ACT 2 Inlet Valve Actuator (5QH2) will not open if the ACT 2 is full of fuel (high level sensor wet).
   (2) Do the Operational Test of the Refuel System AMM 28-25-00-710-003.
   (3) If the PRESELECTED fuel quantity value, on the preselector, does not increase when the INC/DEC swich is set to INC, go to Para. 4.A.(4).
NOTE: You can get more data of the ACT System in the:
  • Description and Operation (D and O) section of the Aircraft Maintenance Manual (AMM) Chap, 28-25-00, the Refuel Defuel System
  • AMM Chap, 28-28-00, the Additional Center Tank (ACT) Transfer System
  • AMM Chap, 28-42-00, the Fuel Quantity Indicating System (FQIS)
  • AMM Chap, 28-46-00, the Fuel Level Sensing System (FLSS)
  • Aircraft Schematic Manual (ASM), Refuel/Defuel System Valve Control ACT 1 ASM 282501
  • ASM, ACT XFR System, Inlet Valve ASM 282801
  • ASM, ACT XFR System, Transfer Valve ASM 282803
  • ASM, ACT XFR System, Vent Valves ASM 282804
  • ASM, FQIS, Monitoring ASM 284210
  • ASM, FLSS, High Level Refuel Control ASM 284601.
4. Fault Isolation
Subtask 28-25-00-810-062-B ** ON A/C NOT FOR ALL
A. Procedure
   (1) If the wing or center tanks fail to refuel in Auto Control:
NOTE: This procedure is for ACT 2 Auto Refuel only.
   (2) If the fault continues:
   (3) If the ACT 2 fails to refuel in manual control:
   (4) If the fault continues in Auto Control, do a check of the RELAY-CTL HI LVL, IND ACT2 (57QJ) and replace if necessary ASM 284601.
   (5) If the fault continues in Auto Control:
NOTE: The step (5) has been included because it is important to make sure that the FQIC is serviceable before you start more steps.
   (6) Do the test given in Para. 3.A.(2).
   (7) If the ACT Auto Refuel operates correctly:
   (8) If the fault continues:
   (9) Make sure that the FQIS Refuel Mode is on (as seen by the FQIC) as follows:
  • the refuel door (192MB/522KB/622KB) to the CTL PNL-REFUEL/DEFUEL (800VU) is open
  • the refuel mode select switch is set to REFUEL
  • the refuel valve switches are all set to NORM
  • the Preselected Fuel Quantity (PFQ) is set to the maximum value
  • the ACT 1 and 2 are not full of fuel.
     (a) Do the Interrogation of the FQIS Input Parameters Page 4 AMM 28-42-00-740-003.
NOTE: The FQIS Input Parameter Pages are automatically updated, without a manual input from the MCDU (CFDS), at a rate of once every 5.5 seconds.
     (b) Examine the bit locations that follow and make sure that they all show a one (1).
       1 FQIC Inputs:
  • A7 (left refuel valve switch 5QU is set to normal)
  • B7 (center refuel valve switch 4QU is set to normal)
  • C7 (right refuel valve switch 6QU is set to normal)
  • D7 (ACT 1 refuel valve switch 40QU is set to normal)
  • E7 (ACT 2 refuel valve switch 42QU is set to normal)
  • E2 (refuel switch 3QU is set to REFUEL, and FQIC refuel mode active)
  • Q2 (only when preselector 5QT set to INC/increment).
     (c) If all the inputs are as specified:
  • go to step (17).
     (d) If an input is not as specified, go to the step shown in the table that follows.
BIT
IF THE BIT STATE SHOWS A ZERO (0) GO TO THE TROUBLE-SHOOTING STEP SHOWN
FQIC PIN MONITORED
A7
(10)
C-8A
B7
(11)
C-9B
C7
(12)
C-8B
D7
(13)
C-10B
E7
(14)
C-9A
E2
(15)
C-8E
Q2
(16)
C-4K
   (10) If the bit A7 is not as specified and shows a zero (0):
     (a) Do a check of the aircraft wiring ASM 282501 between:
  • the CTL PNL-REFUEL/DEFUEL (800VU) free connector 4024VC-A, pin X and the FQIC (3QT) rack connector AC, pin 8A (FQIC 28VDC NORM REFUEL L TK I/P).
     (b) Repair all the unserviceable wiring and connectors.
     (c) Do the test given in Para. 3.A.(2).
     (d) If the fault continues, do the step 1_ or the step 2_ as applicable:
       1 Replace the CTL PNL-REFUEL/DEFUEL [800VU] AMM 28-25-55-000-001 and AMM 28-25-55-400-001.
         a Do the test given in Para. 3.A.(2).
       2 If because of airline operational conditions it is not possible to replace the CTL PNL-REFUEL/DEFUEL (800VU) and internal Trouble-shooting is necessary, continue as follows:
         a Do a check of ASM 282503 and replace if necessary:
         b Do a check of the CTL PNL-REFUEL/DEFUEL (800VU) wiring ASM 282503 between:
  • the SW-MODE SELECT/REFUEL/OFF/DEFUEL/XFR (3QU), terminal 3B and the SW-REFUEL VALVES/OPEN/NORM/SHUT, L WING TK (5QU), terminal 1
  • the SW-REFUEL VALVES/OPEN/NORM/SHUT, L WING TK (5QU), terminal 3 and the connector 4024VC, pin X.
         c Repair all the unserviceable wiring and connectors.
         d Do the test given in Para. 3.A.(2).
   (11) If the bit B7 is not as specified and shows a zero (0):
     (a) Do a check of the aircraft wiring ASM 282501 between:
  • the CTL PNL-REFUEL/DEFUEL (800VU) free connector 4024VC-A, pin V and the FQIC (3QT) rack connector AC, pin 9B (FQIC 28VDC NORM REFUEL C TK I/P).
     (b) Repair all the unserviceable wiring and connectors.
     (c) Do the test given in Para. 3.A.(2).
     (d) If the fault continues, do the step 1_ or the step 2_ as applicable:
       1 Replace the CTL PNL-REFUEL/DEFUEL (800VU) AMM 28-25-55-000-001 and AMM 28-25-55-400-001.
         a Do the test given in Para. 3.A.(2).
       2 If because of airline operational conditions it is not possible to replace the CTL PNL-REFUEL/DEFUEL (800VU) and internal Trouble-shooting is necessary, continue as follows:
         a Do a check of ASM 282503 and replace if necessary:
         b Do a check of the CTL PNL-REFUEL/DEFUEL (800VU) wiring ASM 282503 between:
  • the SW-MODE SELECT/REFUEL/OFF/DEFUEL/XFR (3QU), terminal 3B and the SW-REFUEL VALVES/OPEN/NORM/SHUT, CTR TK (4QU), terminal 1
  • the SW-REFUEL VALVES/OPEN/NORM/SHUT, CTR TK (4QU), terminal 3 and the connector 4024VC, pin V.
         c Repair all the unserviceable wiring and connectors.
         d Do the test given in Para. 3.A.(2).
   (12) If the bit C7 is not as specified and shows a zero (0):
     (a) Do a check of the aircraft wiring ASM 282501 between:
  • the CTL PNL REFUEL/DEFUEL (800VU) free connector 4024VC-A, pin Z and the FQIC (3QT) rack connector AC, pin 8B (FQIC 28VDC NORM REFUEL R TK I/P).
     (b) Repair all the unserviceable wiring and connectors.
     (c) Do the test given in Para. 3.A.(2).
     (d) If the fault continues, do the step 1_ or the step 2_ as applicable:
       1 Replace the CTL PNL-REFUEL/DEFUEL (800VU).
         a Do the test given in Para. 3.A.(2).
       2 If because of airline operational conditions it is not possible to replace the CTL PNL-REFUEL/DEFUEL (800VU) and internal Trouble-shooting is necessary, continue as follows:
         a Do a check of ASM 282503 and replace if necessary:
         b Do a check of the CTL PNL-REFUEL/DEFUEL (800VU) wiring ASM 282501 between:
  • the SW-MODE SELECT/REFUEL/OFF/DEFUEL/XFR (3QU), terminal 3B and the SW-REFUEL VALVES/OPEN/NORM/SHUT, R WING TK (6QU), terminal 1
  • the SW-REFUEL VALVES/OPEN/NORM/SHUT, R WING TK (6QU), terminal 3 and the connector 4024VC, pin Z.
         c Repair all the unserviceable wiring and connectors.
         d Do the test given in Para. 3.A.(2).
   (13) If the bit D7 is not as specified and shows a zero (0):
     (a) Do a check of the aircraft wiring ASM 282501 between:
  • the CTL PNL-REFUEL/DEFUEL (ACT) (801VU) free connector 4067VC-A, pin T and the FQIC (3QT) rack connector AC, pin 10B (FQIC 28VDC NORM REFUEL ACT1 I/P).
     (b) Repair all the unserviceable wiring and connectors.
     (c) Do the test given in Para. 3.A.(2).
     (d) If the fault continues, do the step 1_ or the step 2_ as applicable:
       1 Replace the CTL PNL-REFUEL/DEFUEL (ACT) [801VU] AMM 28-25-58-000-001 and AMM 28-25-58-400-001.
         a Do the test given in Para. 3.A.(2).
       2 If because of airline operational conditions it is not possible to replace the CTL PNL-REFUEL/DEFUEL (ACT) (801VU) and internal Trouble-shooting is necessary, continue as follows:
         a Do a check of ASM 282501 and replace if necessary:
  • the SWITCH-REFUEL VALVE CONTROL, ACT [40QU] .
         b Do a check of the CTL PNL-REFUEL/DEFUEL (ACT) (801VU) wiring ASM 282501 between:
  • the connector 4067VC, pin D and the SW-REFUEL VALVE/OPEN/NORM/SHUT, ACT1 (40QU), terminal 1
  • the SW-REFUEL VALVE/OPEN/NORM/SHUT, ACT1 (40QU), terminal 3 and the connector 4067VC, pin T.
         c Repair all the unserviceable wiring and connectors.
         d Do the test given in Para. 3.A.(2).
   (14) If the bit E7 is not as specified and shows a zero (0):
     (a) Do a check of the aircraft wiring ASM 282501 between:
  • the CTL PNL-REFUEL/DEFUEL (ACT) (801VU) free connector 4067VC-A, pin T and the FQIC (3QT) rack connector AC, pin 9A (FQIC 28VDC NORM REFUEL ACT2 I/P).
     (b) Repair all the unserviceable wiring and connectors.
     (c) Do the test given in Para. 3.A.(2).
     (d) If the fault continues, do the step 1_ or the step 2_ as applicable:
       1 Replace the CTL PNL-REFUEL/DEFUEL (ACT) [801VU] AMM 28-25-58-000-001 and AMM 28-25-58-400-001.
         a Do the test given in Para. 3.A.(2).
       2 If because of airline operational conditions it is not possible to replace the CTL PNL-REFUEL/DEFUEL (ACT) (801VU) and internal Trouble-shooting is necessary, continue as follows:
         a Do a check of ASM 282501 and replace if necessary:
  • the SW-REFUEL VLV CTL ACT 2 (42QU).
         b Do a check of the CTL PNL-REFUEL/DEFUEL (ACT) (801VU) wiring ASM 282501 between:
  • the connector 4067VC, pin D and the SW-REFUEL VALVE/OPEN/NORM/SHUT, ACT2 (42QU), terminal 1
  • the SW-REFUEL VALVE/OPEN/NORM/SHUT, ACT2 (42QU), terminal 3 and the connector 4067VC, pin L.
         c Repair all the unserviceable wiring and connectors.
         d Do the test given in Para. 3.A.(2).
   (15) If the bit E2 is not as specifed and shows a zero (0):
     (a) Do a check of the aircraft wiring ASM 282501 between:
  • the CTL PNL-REFUEL/DEFUEL (800VU) free connector 4024VC-A, pin <H and the FQIC (3QT) rack connector AC, pin 8E (FQIC 28VDC REFUEL SELECT I/P).
     (b) Repair all the unserviceable wiring and connectors.
     (c) Do the test given in Para. 3.A.(2).
     (d) If the fault continues, do the step 1_ or the step 2_ as applicable:
       1 Replace the CTL PNL-REFUEL/DEFUEL (800VU) AMM 28-25-55-000-001 and AMM 28-25-55-400-001.
         a Do the test given in Para. 3.A.(2).
       2 If because of airline operational conditions it is not possible to replace the CTL PNL-REFUEL/DEFUEL (800VU) and internal Trouble-shooting is necessary: continue as follows:
         a Do a check of ASM 282503 and replace if necessary:
         b Do a check of the CTL PNL-REFUEL/DEFUEL (800VU) wiring ASM 282503 between:
  • the connector 4023VC, pin <G and the SW-MODE SELECT (3QU), terminal 1D
  • the SW-MODE SELECT (3QU), terminal 3D and the connector 4024VC, pin <H.
         c Repair all the unserviceable wiring and connectors.
         d Do the test given in Para. 3.A.(2).
   (16) If the bit Q2 is not shown when the preselector 5QT is set to INC (increment):
     (a) Do a check of and replace if necessary:
     (b) Do a check of the aircraft wiring ASM 284203 between:
  • the PRESELECTOR (5QT) free connector 5QT-A, pin L and the FQIC rack connector AC, pin 4K (increment line).
     (c) Repair all the unserviceable wiring and connectors.
     (d) Do the test given in Para. 3.A.(2).
   (17) If all the FQIC inputs are as specified in Step (9)
     (a) Do a check of the aircraft wiring ASM 282501 between:
  • the FQIC (3QT) rack connector AC, pin 10J and the RELAY-PNL (802VU) free connector 4065VC-A, pin <F (FQIC REFUEL CTL SW O/P for ACT 1).
  • the FQIC (3QT) rack connector AC, pin 9K and the RELAY-PNL (802VU) free connector 4065VC-A, pin S (FQIC REFUEL CTL SW O/P for ACT 2).
     (b) Repair all the unserviceable wiring and connectors.
     (c) Do the test given in Para. 3.A.(2).
[Rev.8 from Aug 2018] 2026.04.04 04:28:45 UTC
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