A New Zealand coroner has found that a plane crash which killed nine people at Fox Glacier was probably caused by weight and balance problems, along with pilot error or engine failure.

Victorian tourist Glenn Bourke and Australian-born skydive master Adam Bennett were among the nine people killed when the Skydive New Zealand plane crashed shortly after take-off in September 2010.

In his official report, Coroner Richard McElrea found that all on board died from blunt force injuries sustained when the Walter Fletcher FU24 hit the ground.

He says it is unlikely the cause of the crash will ever be fully understood.

However, he says that inadvertent pilot error or an engine malfunction probably caused the tragedy, along with the plane being overweight and unbalanced.

Coroner McElrea has called on New Zealand's transport minister to urgently consider changes, including the introduction of passenger restraints for tandem skydivers to prevent them sliding rearward during take-off.

He also wants a six-passenger limit set for Walter Fletcher planes used for parachuting.

There were eight passengers on the ill-fated Fox Glacier flight.