Singapore B773 near Los Angeles on Mar 27th 2023, smoke and fire in cabin
Last Update: March 22, 2024 / 17:42:44 GMT/Zulu time
Incident Facts
Date of incident
Mar 27, 2023
Classification
Report
Airline
Singapore Airlines
Flight number
SQ-12
Departure
Tokyo Narita, Japan
Destination
Los Angeles, United States
Aircraft Registration
9V-SWQ
Aircraft Type
Boeing 777-300
ICAO Type Designator
B773
On Mar 22nd 2024 Singapore's TSIB released their final report concluding the probable causes of the incident were:
The IFE smoke was the result of an overvoltage condition and heating within the IFE unit which originated from a combined fault of damaged cable harness and liquid intrusion.
The TSIB analysed:
A previously undetected wire damage on the folding arm-type IFE display panel at seat 41H resulted in a shorting condition where 28V high voltage main power was presented to all other seats’ IFE units within the cabin column concerned via the chassis ground wiring system.
In addition to this latent exposure to the high voltage coming from the chassis ground, a secondary exposure to liquid ingression on the MPJ panel established a connection between this high voltage chassis ground and the digital ground within the MPJ panel. This resulted in an overvoltage condition and heating within the IFE unit that led to smoke and sparks forming.
Despite the cabin crew having turned off the SPM maintenance switch under Seat 47H to cut off the IFE power supply to that seat row, Seat 47’s MPJ panel was still exposed to high voltage coming through the chassis ground from Seat 41H due to the damaged cable harness. As a result of this continued heat stress to the MPJ USB port, a second occurrence of smoke and electrical sparks resulted. It was only after the IFM had turned off the IFE Master Power switch, which cut off the electrical power to the entire IFE system in the cabin, was the high voltage coming through the chassis ground shut off.
The TSIB also mentioned: "According to this passenger, he had attempted to charge his laptop using the right USB port before the aircraft took off from Narita Airport, but as his laptop was not charging, he disconnected the laptop from the USB port and did not use any of the USB ports for the remainder of the flight."
Incident Facts
Date of incident
Mar 27, 2023
Classification
Report
Airline
Singapore Airlines
Flight number
SQ-12
Departure
Tokyo Narita, Japan
Destination
Los Angeles, United States
Aircraft Registration
9V-SWQ
Aircraft Type
Boeing 777-300
ICAO Type Designator
B773
This article is published under license from Avherald.com. © of text by Avherald.com.
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