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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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10/31/24

Message Overview:

Message Name:

LAVATORY OR GALLEY WATER SYSTEM 'EMPTY' LED IS FLASHING YELLOW

Identifier: 3810OBS004
Effectivity: Aircraft 20501 - 20999
System: Waste and Water
Associated CAS: None
Reporting LRU: Water module
System Description: SMM 38-10-00
Schematic Diagram: None
Wiring Diagram: SWM 38-10-00

Message Description:

The lavatory or galley water system 'EMPTY' LED is flashing yellow.

Possible Causes:

  • When purge switch is depressed the 'EMPTY' LED will flash
  • Purge Switch
  • Water Pallet

Required Conditions:

  • Aircraft power ON
  • Cabin Management System ON

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

NOTES:

Quick Links:

Functional Test of the Potable Water System SMM TASK 38-10-00-720-801
Removal of the Water Tanks SMM TASK 38-10-01-000-801
Installation of the Water Tanks SMM TASK 38-10-01-400-801
Removal of the Water System Pallets SMM TASK 38-10-03-000-801
Installation of the Water System Pallets SMM TASK 38-10-03-400-801
Standard Practices - Wire Repair SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Power up the aircraft and make sure the potable water system is serviced.
  2. Press the reset switch at the Galley area or Lavatory. Does the 'EMPTY' LED flash yellow?

    1. If YES, then continue with the next step.
    2. If NO, then do the Functional Check of the water system. If the system is okay, then do close out.

  3. Make sure the PURGE switch is not depressed or Stuck.

    1. If YES, the PURGE switch is depressed or stuck remove and replace PURGE Switch.
    2. If NO, the PURGE switch is okay, then continue with next step.

  4. Locate the Manual override drain valve on either the Galley water pallet or Lavatory water pallet. Verify that the drain handle is positioned in either the 9 O'clock position (Drain Closed) or the 6 O'clock position (Drain Open). Is the drain handle positioned in another position?

    1. If YES, then power OFF the water system by pulling the Galley circuit breaker (GLY WTR SYST) or lavatory circuit breaker (LAV WTR SYST) and rotate the drain handle to the closed position and continue with next step.
    2. If NO, then suspect the water module at fault, replace the water pallet.

  5. Power ON the water system pushing in the Galley circuit breaker (GLY WTR SYST) or lavatory circuit breaker (LAV WTR SYST). Does the manual drain handle rotate to the OPEN position when you press the PURGE button for 3 seconds on the Lavatory or Galley area?

    1. If YES, the drain valve handle completely moved to the OPEN position (6 O' clock) then continue with next step.
    2. If NO, the drain valve handle did not move or did not move fully to the OPEN position then replace the water pallet.

  6. Replace the water pallet.
  7. Do close out.

350_water-module-assy350_galley-breaker350_lavatory-breaker350_water-pallet-assy

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