Message Name:

HIGH LEVEL TEST FAIL

Refuel/Defuel Control Panel High-Level Test did not give expected results.

• Refuel/Defuel Shut-off Valve
• High-Level Sensor
• Fuel Quantity Gauging Computer (FQGC) (A57)
• Refuel/Defuel Control Panel (PL41)
• Associated Wiring

Advisory Wire/Service Bulletin:

• AW300-28-0269 - Fuel Tank High Level Sensor

Forum Articles/Infoservice/Newsletter: None

1. Make sure there are no FUEL QTY FAULT/FAIL EICAS messages. If a fault is found, carry out appropriate troubleshooting.
2. Verify MDC CURRENT FAULTS for 'L(R) TNK HI LVL' fault (B3-007142/B3-007864).
   Select an ItemB3-007142 - 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.

3. Select the active MDC fault or equation from the drop down below prior to following the troubleshooting below.
   Select an ItemB3-006788 - 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.

4. Make sure that RDCPC CB6-C5 (REFUEL DEFUEL VALVES) and CB6-C4 (REFUEL DEFUEL CTL) circuit breakers are pushed in.
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. Carry out the High Level Test as follow:

   1. Connect the fuel nozzle from the fuel tender to the refuel/defuel adapter
   2. Pressurize the fueling hose between 30 and 50 psi (206.84 and 345.74 kPa).
   3. Set the Refuel/Defuel control panel power switch to ON.
   4. Wait 10 seconds.
   5. Carry out lamp test.
   6. Set the fuel selector knob to TEST.
   7. On the Refuel/Defuel control panel, make sure that:

      1. SOV indication CL lights go off
      2. SOV indication OP lights come on
      3. L/R H. LEVEL DETECTORS lights come on
      4. SOV indication OP lights go off
      5. SOV indication CL lights come on.

   8. After approximately 20 seconds, make sure that:

      1. L/R H. LEVEL DETECTORS lights go off
      2. SOV indication CL lights stay on.

9. If the test is not instigated or the H. LEVEL DETECTORS lights do not come on, 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	TEST

   3. On the R/D Panel back connector, check for continuity between pins 36 and 3 while tapping on the rotary selector.

      1. If there is no continuity, replace R/D Panel.
      2. If there is continuity, go to next step.

   4. Verify wiring between FQGC per the following table.
      

      FROM	TO
      A57BP1 (FQGC) pin 28	PL41P1 (R/D Panel) pin 36

   5. If wiring is found serviceable, replace FQGC.

10. During test, if both SOV do not close, replace FQGC.
11. During test, if one SOV does not close, replace the applicable SOV.
12. During the test, if one SOV does not open, do the following:

    1. Verify that the fueling hose was pressurized to 50 psi at step 5. 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. Pressurize the fueling hose between 30 and 50 psi (206.84 and 345.74 kPa).
    6. Set the fuel selector knob to FUEL MAN.
    7. Set the SOV toggle switch of the SOV that did not open to ON.

       1. If the SOV solenoid was heard clicking but the 'open' indication light on the R/D Panel does not illuminate, replace SOV.
       2. If the SOV solenoid did not click, go to next step.

    8. Disconnect the fueling hose from the aircraft.
    9. Set the Refuel/Defuel control panel power switch to ON.
    10. Set the fuel selector knob to DEFUEL.
    11. 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:
           

           LH R/D SOV		RH R/D SOV
           A57BP1	A59P2	A57BP1	A59P1
           PIN 20	PIN 3	PIN 18	PIN 3

        3. If wiring is found serviceable, replace FQGC.

13. During test, if neither SOV opened, replace FQGC.
14. Do close out.