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Routing of landing gear selector valve electrical harness

Issue number: AO-2012-024-SI-01
Who it affects: All owners and operators of SA227 aircraft
Issue owner: Elbit Systems of America
Operation affected: Aviation: Other
Background: Investigation Report AO-2012-024
Date: 29 September 2014

Safety issue description

The proximity of the landing gear selector valve electrical wiring loom to the external hydraulic power connectors within the left engine nacelle on Fairchild SA227-AT Metro aircraft resulted in the ‘down selection’ wire being damaged during routine maintenance activities.

Proactive Action

Action organisation: Elbit Systems of America
Action number: AO-2012-024-NSA-036
Date: 29 September 2014
Action status: Closed

Elbit Systems of America advised that, as a result of this occurrence, re-routing of the landing gear selector valve electrical wiring loom in the worldwide Metro aircraft fleet has been implemented. A Metro Global advisory publication has also been distributed to all Metro operators advising the new routing requirements.

ATSB response:

The ATSB welcomes the action by Elbit Systems of America to re-route the landing gear selector valve electrical wiring loom in Metro aircraft and advise operators of this new requirement.

Proactive Action

Action organisation: Toll Aviation Pty Ltd
Action number: AO-2012-024-NSA-037
Date: 29 September 2014
Action status: Closed

As a result of this occurrence, Toll Aviation Pty Ltd re-routed the landing gear selector valve electrical wiring loom within the left nacelle of its Metro III/23 aircraft to minimise the risk of damage to the wires during routine maintenance.

ATSB response:

The ATSB acknowledges the action taken by Toll Aviation Pty Ltd to re-route the landing gear selector valve electrical wiring loom within the left nacelle of its Metro III/23 aircraft, reducing the risk of damage to these wires during routine maintenance.

   
Current issue status: Adequately addressed
Status justification:

The ATSB is satisfied that the action by Elbit Systems of America to re-route the landing gear selector valve electrical wiring loom in the worldwide fleet of Metro aircraft, and advise operators of this new requirement will, when implemented across the fleet, minimise the risk of damage to the wires during routine maintenance. The proactive safety action by Toll Aviation Pty Ltd pre-empts this action.

 
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Last update 29 September 2014