United B763 at London on Apr 29th 2019, smoke in cabin
Last Update: October 10, 2019 / 15:07:33 GMT/Zulu time
On Oct 10th 2019 the UK AAIB released their bulletin concluding the probable cause of the serious incident was:
Damage to the harness was found to have been caused by an unidentified electrical event between two of the insulated wires within the harness. The electrical event led to arcing between the wires which generated significant heat, enough to cause localised melting of the copper strands in the wires. The exact nature of this event could not be determined.
The AAIB wrote: "The operator carried out an examination of the area and identified the source of the smoke and haze. Wiring in the cabin ceiling lighting harness above Row 19/20 on the left side showed evidence of electrical arcing and heat damage. There was also soot on the insulation surrounding a section of wiring, as shown in Figure 1. The circuit breaker (CB) protecting the circuit was found to have tripped. The wiring harness, CB and the lighting ballast connected to the harness were removed for further examination by the manufacturer. The CB and lighting ballast passed functional tests."
Aircraft Registration Data
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