The United States Federal Aviation Administration regulations and associated guidance material did not fully address the potential harm to flight safety posed by liquid contamination of electrical system units in transport category aircraft.
Action taken by the ATSB
During the investigation, the ATSB discussed the background for this safety issue and the associated safety risk with the United States Federal Aviation Administration (US FAA). The potential for a reduction in the associated risk to as low as reasonably practicable by proactive US FAA safety action was highlighted.
The ATSB considers that the risk of ongoing or emerging design, operation and maintenance issues with the potential to result in liquid contamination of electrical system units in transport category aircraft could be significantly reduced over time by improved regulatory guidance and oversight. For example, existing designs and processes should be monitored for continuing effectiveness while consideration of alternative design principles may be applied to new aircraft designs.
Action taken by the US FAA
The US FAA did not provide comment in response to this safety issue.