Jump to Content
Download Final report
[ Download PDF: 1.93MB]

What happened

On 9 December 2013, the pilot/owner of an amateur-built Stoddard-Hamilton Glasair III aircraft, registered VH-USW and operated in the ‘experimental’ category, was conducting a local flight from Jandakot Airport, Western Australia with a passenger on board.

Shortly after take-off, when about 2 km from the airport, the aircraft’s engine stopped without warning. During the ensuing forced landing onto a sports oval, the aircraft’s left wing detached from the fuselage after striking a metal goal post. Fuel from the ruptured left wing fuel tank ignited as the aircraft tumbled across the ground.

The pilot and passenger sustained serious burns and were taken to hospital. The aircraft was destroyed by impact forces and an intense post-impact fuel-fed fire.

Photograph of Stoddard-Hamilton Glasair III, VH-USW

Stoddard-Hamilton Glasair III, VH-USW






Source: Aircraft owner

What the ATSB found

During the aircraft’s construction, modification of the electronic ignition system incorporated a single point of failure in the intended dual system, increasing the risk of the simultaneous failure of both systems and a total loss of engine power. In addition, the connector plug used for the modification was inappropriate for the in-line installation, increasing the risk of its disconnection and disabling the ignition system.

Examination of the engine found that the single wiring harness for the ignition system was disconnected from the connector plug. However, due to the level of impact and fire damage sustained by the aircraft, the ATSB was unable to conclusively establish if this occurred inflight, resulting in the total engine power loss, or during the early stages of the impact sequence.

Safety message

The aviation industry has long recognised the need for redundant systems, particularly those relating to safety-critical components. The ATSB cautions that, even if unintended, the incorporation of a single point of failure into such systems during construction or modification can eliminate all levels of redundancy. In this case, damage to the aircraft’s modified single wiring harness resulted in the failure of an otherwise redundant system, with near-fatal consequences.


Download Final report
[ Download PDF: 1.93MB]

The occurrence


Safety analysis


Sources and submissions


To download an image click the download link then right-click the image and select save image as.

Copyright in material obtained from other agencies, private individuals or organisations, belongs to those agencies, individuals or organisations. Where you want to use their material you will need to contact them directly.

General details
Date: 09 Dec 2013 Investigation status: Completed 
Time: 1436 WST Investigation type: Occurrence Investigation 
Location   (show map):near Jandakot Airport Occurrence type:Collision with terrain 
State: Western Australia Occurrence class: Operational 
Release date: 03 Sep 2015 Occurrence category: Accident 
Report status: Final Highest injury level: Serious 
Aircraft details
Aircraft manufacturer: Amateur Built Aircraft 
Aircraft model: Stoddard-Hamilton Glasair III 
Aircraft registration: VH-USW 
Serial number: SH-3311 
Type of operation: Private 
Sector: Sport and recreational 
Damage to aircraft: Destroyed 
Departure point:Jandakot, WA
Share this page Provide feedback on this investigation
Last update 03 September 2015