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Non-standard Joint H fitting upper attachment hardware

Issue number: AO-2013-226-SI-03
Who it affects: Owners and operators of DH82 and DH82A Tiger Moth aircraft
Issue owner: Civil Aviation Safety Authority and de Havilland Support Ltd
Operation affected: Aviation: General aviation
Background: Investigation Report AO-2013-226
Date: 21 January 2016

Safety issue description

Together with a number of other Australian Tiger Moths, VH-TSG was fitted with non‑standard Joint H attachment bolts that did not conform to the original design with the result that the integrity of the Joint H could not be assured.

Initial ATSB advice of the safety issue

The ATSB provided initial advice to de Havilland Support Ltd and the Civil Aviation Safety Authority about this evolving safety issue on 28 August 2014. The full extent of the issue was not understood until later in the investigation, and was advised to both organisations in the draft investigation report.

Proactive Action

Action organisation: de Havilland Support Ltd
Action number: AO-2013-226-NSA-046
Date: 21 January 2016
Action status: Released

A new Tiger Moth Technical News Sheet [TNS] is to be issued in January 2016 by de Havilland Support Ltd, explaining the structural significance of the special-to-type fuselage Joint H bolts, Part No. H37868. The TNS will require verification that the as-designed special bolts are installed. If not, replacement H37868 bolts and new H37869A tie rods will be required to be fitted. It is expected that a UK CAA [United Kingdom Civil Aviation Authority] Airworthiness Directive will mandate the TNS actions, ensuring conformity to the original design standard.

   
Current issue status: Safety action pending
Status justification:

The ATSB is satisfied that the safety action by de Havilland Support Ltd will, once implemented, address this safety issue.

 
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Last update 24 February 2016