Aviation safety issues and actions

Ineffective corrosion protection of Main Rotor Gearbox

Issue number: AO-2011-088-SI-01
Who it affects: Operators of Robinson R44 helicopters
Issue owner: Robinson Helicopter Co
Transport function: Aviation: Other
Background: Investigation Report AO-2011-088
Issue release date: 27 August 2012
Current issue status: Safety action pending
Issue status justification:

The ATSB is awaiting confirmation that the safety action has been introduced into the manufacturing process.

Safety issue description

Paint application to the main rotor gearbox, gear carrier did not effectively protect the part from corrosion resulting from gearbox water ingress.

Last update 24 February 2014