Aviation safety issues and actions

Maintenance for repetitve lift missions

Issue number: AO-2009-081-SI-01
Who it affects: All operators and maintainers of ex-military helicopters engaged in repetitive lift missions
Issue owner: Civil Aviation Safety Authority
Transport function: Aviation: Maintenance
Background: Investigation Report AO-2009-081
Issue release date: 11 November 2011
Current issue status: Adequately addressed
Issue status justification:

Satisfied that AWB will inform at-risk operators and maintainers of identified safety issue.

Safety issue description

The scheduled maintenance requirements for ex-military UH-1 series helicopters may not adequately address the increased risk of fatigue failures associated with repetitive heavy lifting operations that were not considered in the original design fatigue calculations.

Proactive Action

Action number: AO-2009-081-NSA-089
Action organisation: Civil Aviation Safety Authority
Date: 11 November 2011
Action status: Closed

On 5 July 2011, the Civil Aviation Safety Authority (CASA) published Airworthiness Bulletin 02 40 Issue 1 to:

...advise operators and maintainers to investigate the basis for and the correct implementation of the continuing airworthiness requirements of the applicable type certificate data sheet (TCDS) and incorporated supplemental type certificates (STC), particularly in regard to the retirement lives of all life-limited components.

ATSB comment:

The ATSB is satisfied that the action taken by CASA adequately addresses the safety issue.

Last update 21 February 2014