Interruption of electrical power to the multi purpose flight recorder due to water ingress removed of an important source of information used to identify safety issues.
Improved water proofing measures to be implemented.
The helicopter manufacturer has developed modifications to improve the overall water proofing of AW139 helicopters and is currently developing service bulletin 139-105 to provide the required detail to operators.
The ATSB is satisfied that the action by the helicopter manufacturer will, once in place, adequately address the safety issue.
Following the occurrence, the operator developed a modification, in accordance with an engineering order, to prevent moisture ingress affecting the multi-purpose flight recorder power supply. Details of the modification were supplied to the helicopter manufacturer.
The ATSB is satisfied that the action taken by the helicopter operator adequately addresses the safety issue.
