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Printed page label not indexed. PDF page 1.
safely at Schiphol Airport. The loss of power to the two AC buses was the result of water ingress into Generator Control Units (GCUs) 1 and 4, located in the E1/E2 rack in the Main Equipment Centre beneath the cargoOpen official document at PDF page 1AAIB final report: G-ONEE
Printed page label not indexed. PDF page 2.
AAIB Bulletin: G-ONEE AAIB-29853 in the water ingress protection measures were found that could have caused or contributed to the water ingress. There have been previous events of water ingress into GCUs and other events of wOpen official document at PDF page 2AAIB final report: G-ONEE
Printed page label not indexed. PDF page 14.
on top shelf of E1 and E2 racks in Main Equipment Centre (image © The Boeing Company) Water ingress protections The entire main cargo deck of the aircraft is designed to be a ‘wet area', and this includes the floorOpen official document at PDF page 14AAIB final report: G-ONEE
Printed page label not indexed. PDF page 22.
result in GCU 4 tripping its BTB and GCB, isolating AC Bus 4 from all sources of power. Water ingress could have caused both faults. The NVM also indicated that the cycling nature of the loss of AC Bus 4Open official document at PDF page 22AAIB final report: G-ONEE
Printed page label not indexed. PDF page 26.
explained in report section ‘Service Bulletins and Airworthiness Directives to address water ingress into MEC'. © Crown copyright 2026 26 All times are UTCOpen official document at PDF page 26AAIB final report: G-ONEE
Printed page label not indexed. PDF page 30.
AAIB Bulletin: G-ONEE AAIB-29853 Previous incidents of water ingress into the MEC of Boeing 747-400 aircraft The Australian Transportation Safety Board (ATSB) published a report on an electrical failure event involving a passenger variant oOpen official document at PDF page 30AAIB final report: G-ONEE