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Electrical interuption due to water ingress

Issue number: AO-2009-004-SI-04
Who it affects: Operators of ‘long nose configuration’ AW139 helicopters
Issue owner: Agusta, S.p.A, Construzioni Aeronautiche
Operation affected: Aviation: General aviation
Background: Investigation Report AO-2009-004
Date: 05 October 2010

Safety issue description

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.

Proactive Action

Action organisation: Agusta Westland
Action number: AO-2009-004-NSA-041
Date: 05 October 2010
Action status: Closed
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.

ATSB response:

The ATSB is satisfied that the action by the helicopter manufacturer will, once in place, adequately address the safety issue.

Proactive Action

Action organisation: Emergency Management Queensland Helicopter Rescue
Action number: AO-2009-004-NSA-042
Date: 05 October 2010
Action status: Closed
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.

ATSB response:

The ATSB is satisfied that the action taken by the helicopter operator adequately addresses the safety issue.
Current issue status: Adequately addressed
Status justification:

Improved water proofing measures to be implemented.

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Last update 28 February 2014