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(WARNING)
RED MESSAGE (CAUTION)
AMBER MESSAGE (ADVISORY)
CYAN MESSAGE (STATUS)
WHITE MESSAGE Require immediate crew attention. These messages are accompanied by flashing master warning, triple chime attenson with or without voice message or dedicated tone. Require immediate crew awareness and future crew action may be required in the form of alternate system selection or performance limitation. These message are accompanied by flashing master caution and a single chime. Indicate safe or normal system operation which require crew awareness, over and above the dark cockpit philosophy. Indicate minor failures or reduction in systems capability, which require no crew action.

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09/06/23

Message Overview:

Message Name:

WATER SYSTEM LEVEL INDICATION ERRONEOUS / ALL EXT PANEL LIGHTS ARE BLINKING

Message Code: 381OBS005
Effectivity: Aircraft not equipped with the Collins CES
System: Potable Water System
System Description: 38-10-00 - The Potable Water System
Schematic Diagram: See supplemental wiring diagrams
Wiring Diagram: See supplemental wiring diagrams

Message Description:

The water level indication on the FWD or AFT external water control panel is not correct. The galley touchscreen may also display the water tank level erroneously.

Possible Causes:

  • Water level probe
  • Water controller
  • Water control panel
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Refer to the supplemental WATER LEVEL INDICATION Wiring Diagram (WD), WG38XXXXXX for the following troubleshooting.
  2. Have one person observing the affected external water control panel and one person inside the aircraft performing the electrical testing.
  3. Access and disconnect the Water Level Controller associated to the water tank not indicating properly.
  4. On the aircraft side connector, provide a ground in sequence to the four level indication outputs. Do the corresponding external water control panel LED light up in sequence as well?

    1. If YES, replace the water level controller and do the close out.
    2. If NO, continue with the next step.

  5. perform a wiring check between the affected external water control panel and the associated water level controller.
  6. Is the wiring good?

    1. If YES, contiue with the next step.
    2. If NO, repair defective wiring as required and do the close out.

  7. Swap the FWD and the AFT water quantity probe. Did the indication problem follow the suspected probe?

    1. If YES, replace the defective water quantity probe.
    2. If NO, continue with next step.

  8. Or you can measure the quantity probe as follow:
  9. Get access to probe connector

    1. Between pin D and A, resistance should be approximatively 500 ohms
    2.  Between pin D and B, resistance should be approximatively 250 ohms
    3. Between pin A and B, resistance should be approximatively 250 ohms
    4. between pin B and C, resistance should be approximatively 255 ohms. Most important, the readings between B and C should be almost identical to readings between D and B or A and B (+/- 10 ohms)

  10. Perform a wiring check between the affected water level controller and the associated water quantity probe.

    1. If wiring defects are found, repair defective wiring as required and do close out.
    2. If no defects are found, continue with next step.

  11. Replace the suspected external water control panel.
  12. Do close out.

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