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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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For AOG assistance contact:

CRC Montreal (YUL)
Quick Links

12/19/25

Message Overview:

Message Name:

LAVATORY OR GALLEY WATER SYSTEM 'ACTIVE' LED IS FLASHING GREEN

Identifier: 381OBS001
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 'ACTIVE' LED is flashing green.

Possible Causes:

  • System is pressurizing (wait 10 seconds)

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

Troubleshooting Recommendations:

  1. When the aircraft is powered ON and the Lavatory or Galley water system shows an ACTIVE green LED flashing, wait for the water system to pressurize. Usually in 10 seconds the ACTIVE LED will go to a solid green LED indicating the water system is pressurized.
  2. No action needed, do close out.

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