Message Name:

REFUEL DEFUEL SOV WILL NOT OPEN IN MANUAL MODE

One or both refueling Shutoff Valve (SOV) will not open in manual mode.

• Refuel/Defuel Manifold (A59)/Left Refuel/Defuel Shutoff Valve
• Refuel/Defuel Manifold (A59)/Right Refuel/Defuel Shutoff Valve
• Left Fuel Tank High Level Sensor (MT15)
• Right Fuel Tank High Level Sensor (MT16)
• Refuel/Defuel Panel (PL41)
• Fuel System Computer Unit (A57)
• Associated Wiring

Advisory Wire/Service Bulletin: None

Full Throttle Blog/Forum Articles/Infoservice/Newsletter: None

Flight Operation Notifications Manual (FONM): None

NOTES:

• Fill the Detailed FQGC Troubleshooting Report if Fuel Quantity Gauging Computer (FQGC) pn 738360-1-2 is replaced

1. Make sure that RDCPC CB6-C5 (REFUEL DEFUEL VALVES) and CB6-C4 (REFUEL DEFUEL CTL) circuit breakers are pushed in.
2. Make sure there are no FUEL QTY FAULT/FAIL EICAS messages or any MAGENTA indications are present on the fuel synoptic page.

   1. If a fault is found, carry out appropriate troubleshooting.

3. Verify MDC CURRENT FAULTS for 'L(R) TNK HI LVL' fault (B3-007142/B3-007864).
   Select the MDC Codes:B3-007142 - OPN/SHRT/OUT OF RANGE [L TNK HI LVL]B3-007864 - OPN/SHRT/OUT OF RANGE [R TNK HI LVL]
   

   1. If fault code is present, carry out B3-007142/B3-007864 troubleshooting.
   2. If fault code is not present, continue with next step.

4. Select the active MDC fault or equation from the drop down below prior to following the troubleshooting below.
   Select the MDC Codes:B3-006788 - NO FQGC OUTPUT TO RDC [FQGC]B3-006789 - INTERNAL FAULT [FQGC]B3-006790 - NO L-GP-5 BUS INPUT [FQGC]B3-006791 - NO R-GP-5 BUS INPUT [FQGC]B3-006792 - WOFFW INPUT DISAGREE [FQGC]B3-006793 - NO FQGC-A BUS TO RDC [FQGC]B3-006794 - NO FQGC-B BUS TO RDC [FQGC]B3-006795 - AHC INPUT DISAGREE [FQGC]B3-006796 - NO COMM WITH FQGC [FUS R/D PANEL]B3-007021 - OPN/SHRT/OUT OF RANGE [L COLLECT PROBE]B3-007128 - OPN/SHRT/OUT OF RANGE [L TNK PR 8/COMP]B3-007135 - OPN/SHRT/OUT OF RANGE [L TNK PROBE 1]B3-007136 - OPN/SHRT/OUT OF RANGE [L TNK PROBE 2]B3-007137 - OPN/SHRT/OUT OF RANGE [L TNK PROBE 3]B3-007138 - OPN/SHRT/OUT OF RANGE [L TNK PROBE 4]B3-007139 - OPN/SHRT/OUT OF RANGE [L TNK PROBE 5]B3-007140 - OPN/SHRT/OUT OF RANGE [L TNK PROBE 6]B3-007141 - OPN/SHRT/OUT OF RANGE [L TNK PROBE 7]B3-007690 - OPN/SHRT/OUT OF RANGE [R COLLECT PROBE]B3-007850 - OPN/SHRT/OUT OF RANGE [R TNK PR 8/COMP]B3-007857 - OPN/SHRT/OUT OF RANGE [R TNK PROBE 1]B3-007858 - OPN/SHRT/OUT OF RANGE [R TNK PROBE 2]B3-007859 - OPN/SHRT/OUT OF RANGE [R TNK PROBE 3]B3-007860 - OPN/SHRT/OUT OF RANGE [R TNK PROBE 4]B3-007861 - OPN/SHRT/OUT OF RANGE [R TNK PROBE 5]B3-007862 - OPN/SHRT/OUT OF RANGE [R TNK PROBE 6]B3-007863 - OPN/SHRT/OUT OF RANGE [R TNK PROBE 7]B3-648401 - IRS INPUT DISAGREE [FQGC]
   

   1. If any of the fault codes, listed on that page are present on the aircraft, troubleshoot these fault codes first.
   2. If none of the fault codes are present, continue with next step.

5. On Refuel/Defuel Panel, verify that both H. LEVEL DETECTOR lights are OFF before initiating the High Level Test.
   NOTE: Extremely low ambient temperature (below -40°C (-40°F)) can create a false high level indication and prevent refueling.

   1. If one H. LEVEL DETECTOR light is ON and its tank is not full, interchange high level Sensors.

      1. If problem follows, replace faulty high level sensor.
      2. If problem does not follow, verify wiring between high level sensor and FQGC.
      3. If wiring is found serviceable, go to next step.

   2. If both H. LEVEL DETECTOR lights are ON and their respective tanks are not full, go to next step.
      NOTE: A failure of a SOV to OPEN shall not be considered faulty if the corresponding tank was already filled up to the High Level Sensor at initiation of the test.
      

6. Re-rack the Fuel Quantity Gauging Computer (FQGC). Is the fault message still present?

   1. If YES, go to next step.
   2. If NO, do close out.

7. Replace the Fuel Quantity Gauging Computer (FQGC).
8. Try refueling in manual mode and observe the SOV indication lights on the R/D Panel.
9. During the test, if one SOV does not open, do the following:

   1. Verify that the fueling hose was pressurized to 50 psi. If not, pressurize the fueling hose to 50 psi and carry out step 5 again.

      1. If raising the pressure to 50 psi opens the faulty valve, consider replacing the valve.

   2. Access Refuel/Defuel SOV through access panel 181BL.
   3. Have a person close to the SOV that will listen for a solenoid clicking.
   4. Set the Refuel/Defuel control panel power switch to ON.
   5. Set the fuel selector knob to FUEL MAN.
   6. Set the SOV toggle switch of the SOV that did not open to ON.

      1. If the SOV solenoid was heard clicking and fuel quantity did not rise, replace SOV.
      2. If the SOV solenoid did not click, go to next step.

   7. Disconnect the fueling hose from the aircraft.
   8. Set the Refuel/Defuel control panel power switch to ON.
   9. Set the fuel selector knob to DEFUEL.
   10. Set the SOV toggle switch of the SOV that did not open to ON.

       1. If the SOV solenoid did not click, replace SOV.
       2. If the SOV solenoid was heard clicking, verify wiring as per the following table:

          From	To	Result
          A57BP1-20	A59P2-3
          A57BP1-18	A59P1-3

       3. If wiring is found serviceable, replace FQGC.

10. During the test, if neither valves opened, do the following:

    1. Remove R/D Panel from the aircraft.
    2. Set the R/D Panel to the following configuration:

       POWER SWITCH	ON
       ROTARY SELECTOR	FUEL MAN

    3. On the R/D Panel back connector, check for continuity while tapping on the rotary selector as follows:

       From	To	Result	Result
       PL41J1-13	PL41J1-3
       PL41J1-8	PL41J1-3

       1. If there is no continuity, replace R/D Panel.
       2. If there is continuity, replace FQGC.

11. Do close out.