Aviation safety issues and actions

Engines with un-doweled crankshaft–propeller flange joints

Issue number: AO-2013-046-SI-01
Who it affects: All owners and operators of Jabiru J230 & J430 aircraft with an engine number before 33A2446 i.e. 2,445 pre-July 2011 engines.
Issue owner: Jabiru Aircraft Pty Ltd
Operation affected: Aviation: General aviation
Background: Investigation Report AO-2013-046
Date: 19 August 2014

Safety issue description

Jabiru engines manufactured before July 2011 have reduced strength and reliability of the crankshaft/propeller flange joint, compared with the later design that incorporated positive location dowel pins.

Proactive Action

Action organisation: Jabiru Aircraft Pty Ltd
Action number: AO-2013-046-NSA-014
Date: 19 August 2014
Action status: Closed

The current revision of the Jabiru Engine Overhaul Manual (document JEM0001-6) now includes a strong recommendation that owners update their engines during the next full overhaul or bulk strip, to include propeller flange dowels between the crankshaft and propeller flange - see Appendix A.

ATSB response:

The ATSB is satisfied that the action to be taken by Jabiru should reduce the risk of design deficiencies with earlier (pre-engine SN 2446) crankshaft/ propeller flange assemblies.

Current issue status: Adequately addressed
Status justification:

The amendments should ensure the increased reliability of the propeller flange/crankshaft joint and the reduced likelihood of propeller loss due to joint fastener failure.

Last update 19 August 2014