The same Bankstown-based company operated the helicopter that crashed at Bulli Tops yesterday, killing four people, and a helicopter involved in a fatal accident at Jaspers Brush last year.
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Bankstown Helicopters, flying from Bankstown Airport, was home to both VH-COK, which crashed on February 4, killing two filmmakers, and VH-HWQ, which came down yesterday afternoon.
The helicopters were both Robinson R44 models, used for joy flights and private charters.
In March last year, the Australian Transport Safety Bureau (ATSB) issued an urgent safety notice to R44 owners, encouraging them to consider replacing aluminium fuel tanks with bladder-type tanks.
The recommended fuel tanks improve resistance to post-accident fuel leaks, which can cause fires.
Manufacturer Robinson Helicopter Company issued a service bulletin in 2010, requiring R44 helicopters with all-aluminium fuel tanks to be retrofitted with the bladder-type tanks, no later than April 30 this year.
An ATSB spokesperson said it was too early to say whether the helicopter involved in yesterday's crash had replaced its all-aluminium tank but an investigation would be carried out.
Robinson Helicopter Company also issued a safety notice in July 2006, strongly recommending helicopter occupants wear a fire-retardant flight suit, gloves and hood to reduce the risk of being burnt in a post-crash fire.
Four people were killed about midday yesterday when the VH-HWQ helicopter came down in a grass clearing near Panorama House function centre.
An Airservices Australia spokesperson said the helicopter had been flying outside controlled air space and was operating under a "see and avoid" regime, as followed by free air space users.
Bankstown Helicopters chief pilot William Miller said VH-HWQ had been privately hired by a private pilot for yesterday's flight and was conducting private operations.
He was unable to comment about the circumstances of the accident.
Film producer Andrew Wight, a close friend of Titanic director James Cameron, and fellow filmmaker Mike deGruy were killed when their aircraft crashed and burst into flames near Berry last year.
The pair were flying from Jaspers Brush to Jervis Bay, scouting locations for an upcoming movie, when the helicopter's tailskid struck the ground shortly after lift-off.
The chopper then lurched forward and rolled before it hit the ground and was engulfed by flames.
The ATSB confirmed last year it was investigating whether the helicopter had been modified to reduce the risk of fire.
A bureau spokesperson said the results of the investigation would be released in the next four to six weeks.