Marine safety issues and actions

Processes for the monitoring of the exciter unit insulation resistance

Issue number: MO-2017-003-SI-01
Who it affects: Those responsible for maintaining Azipods
Issue owner: Norwegian Cruise Line Holdings Ltd (NCLH) and ABB Industry Oy (ABB)
Transport function: Marine: Shipboard operations
Background: Investigation Report 329-MO-2017-003
Issue release date: 24 May 2018
Current issue status: Safety action pending

Safety issue description

The processes for monitoring the condition of the brushless exciter units’ electrical insulation were ineffective in detecting deterioration prior to unit failure.

Recommendation

Action number: MO-2017-003-SR-001
Action organisation: Norwegian Cruise Line Holdings Ltd (NCLH)
Date: 24 May 2018
Action status: Released

The Australian Transport Safety Bureau recommends that NCLH reviews the shipboard processes for monitoring the condition of the brushless exciter units used in Azipod installations. The review should incorporate findings from the examination of the failed equipment following the dry docking of Norwegian Star.

Recommendation

Action number: MO-2017-003-SR-002
Action organisation: ABB Industry Oy (ABB)
Date: 24 May 2018
Action status: Released

The Australian Transport Safety Bureau recommends that ABB reviews the manufacturer’s instructions for monitoring the condition of the brushless exciter units used in Azipod installations. The review should incorporate findings from the examination of the failed equipment following the dry docking of Norwegian Star.

Last update 30 July 2018