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Printed page label not indexed. PDF page 2.
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 water contamination of the electrical/electronicOpen official document at PDF page 2AAIB final report: G-ONEE
Printed page label not indexed. PDF page 22.
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 4 was due to theOpen official document at PDF page 22AAIB final report: G-ONEE
Printed page label not indexed. PDF page 23.
cover plate, above the location of GCU 4, had compromised sealant (Figure 12) which could have provided a path for water to travel to the GCU from above the drip shield. The sealant on the end cover plate on theOpen official document at PDF page 23AAIB final report: G-ONEE
Printed page label not indexed. PDF page 25.
that the drain hole was clear and did not leak. The missing screw created a hole that could have allowed water to pass down directly on top of the drip shield above the E1/E2 racks. Figure 15 Missing screw beneathOpen official document at PDF page 25AAIB final report: G-ONEE
Printed page label not indexed. PDF page 26.
removed to repair the sealant, the drip shield was found to be damaged and had holes which could have been a potential path for water. Similar damage and holes were found in the drip shield when the bracket on theOpen official document at PDF page 26AAIB final report: G-ONEE
Printed page label not indexed. PDF page 37.
incident. The GCU component manufacturer stated that the sensed external electrical faults could have been triggered by water ingress in the GCUs causing internal short circuits. Since the moisture was no longer present this explained why GCU 1 passed itsOpen official document at PDF page 37AAIB final report: G-ONEE