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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)
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04/27/21

Message Overview:

Message Name:

FADEC ECU WATER INGRESS

Identifier: 761OBS001
Effectivity: Aircraft 20501 - 20999
System: Fuselage
Associated CAS: None
System Description: 76-11-00
Schematic Diagram: 76-11-00
Wiring Diagram: None

Message Description:

Aircraft have experienced EICAS messages and ECU fault codes in flight or upon aircraft power-up after the aircraft was parked in heavy rain.

Multiple MCID Fault Codes recorded in FADEC ECU Non-volatile Memory (NVM).

Possible Causes:

  • Water Ingress to the FADEC ECU A (RH) (A40)
  • Water Ingress to the FADEC ECU A (LH) (A41)
  • Water Ingress to the FADEC ECU B (RH) (A42)
  • Water Ingress to the FADEC ECU B (LH) (A43)

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

  • AW300-76-0243 - Electronic Control Unit (ECU) Water Ingress (20003 - 20500)

Forum Articles/Infoservice/Newsletter: None

Quick Links:

HW Light Maintenance Manual LMM AS907-1-1A

Troubleshooting Recommendations:

  1. Honeywell SB AS907-76-9021 is available on Honeywell's website.

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