Defence inquiry to examine Chinook crash

Defence force chief General David Hurley has appointed a full commission of inquiry to examine the crash of an Australian helicopter in Afghanistan that killed a soldier.

The crash happened on May 30 last year when a CH-47D Chinook helicopter crashed in Zabul Province, killing Lieutenant Marcus Case, a member of the 6th Aviation Regiment, who was the 26th Australian soldier to die in Afghanistan.

Immediately after the crash, Army chief Lieutenant General David Morrison ordered an aviation accident investigation to identify any aviation safety issues.

General Hurley said that investigation was finalised in December and its findings would inform the commission of inquiry.

He said the report won’t be publicly released. However details were published in News Ltd newspapers on Wednesday, attributing the cause of the accident to what was termed “uncontrolled pitch oscillation” while flying close to the ground.

That occurs when the pilot continually over-corrects an error, eventually resulting in loss of control.

The Chinook’s tandem rotor configuration can make it more susceptible to this instability, with defence scientists concluding that the automatic flight control system could sustain rather than dampen these oscillations in certain circumstances.

General Hurley said the commission of inquiry would examine broader issues associated with the helicopter crash and the death of Lieutenant Case.

“This includes aspects that were not covered by the technical airworthiness investigation but that may have implications for Australian CH-47D operations,” he said in a statement.

Presiding over the inquiry will be Andrew Kirkham QC who most recently conducted the inquiry into the ADFA “Skype scandal.”

In addition, the commission of inquiry will comprise two members with substantial Defence aviation experience, retired Brigadier Bill Mellor, an army aviator who commanded Australian forces in Somalia, and Group Captain Stephen Fielder, a former helicopter test pilot who served on the board of inquiry examining the crash of a Black Hawk off Fiji in 2006.

General Hurley said inquiry hearings would be open to the public, although the president could close proceedings if necessary.

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