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
Transport function: Aviation: General aviation
Background: Investigation Report AO-2013-046
Issue release date: 19 August 2014
Current issue status: Adequately addressed
Issue 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.

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 number: AO-2013-046-NSA-014
Action organisation: Jabiru Aircraft Pty Ltd
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 comment:

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.

Last update 19 August 2014