More jobs are set to be lost at the aviation arm of construction giant John Holland.
John Holland Aviation Services (JHAS) said on Friday it had started to reduce maintenance operations at its Melbourne base at Tullamarine, blaming current market conditions.
The company did not say how many jobs were at risk, but the Australian Manufacturing Workers' Union (AMWU) said 230 airline maintenance positions were set to go.
That includes 150 jobs at Tullamarine and the rest at JHAS' operations in Adelaide, Perth, Sydney and Brisbane.
Forty engineers and technical staff were laid off at JHAS' Tullamarine base in July 2013 as demand for maintenance services from airlines weakened.
"It's another sad story, another nail in the coffin of the airline maintenance industry," AMWU state organiser Victor Jose told AAP.
He said there was little hope of saving the maintenance jobs of the affected workers because JHAS simply did not have the scale to survive.
The maintenance operations were expected to be closed by June this year, Mr Jose said.
A John Holland spokeswoman said the company was investigating opportunities to redeploy the affected workers.
"In the event that alternative employment cannot be found, staff will unfortunately be made redundant," she said.
"In this event, they will receive their full entitlements."
John Holland, a subsidiary of Leighton, Australia's largest project development and contracting group, said it was looking to sell the Tullamarine facility.
John Holland group managing director Glenn Palin said the company was focusing on its infrastructure, rail and specialist engineering capabilities.
The job losses come as Qantas cuts 5,000 positions as part of a three-year program aimed at saving $2 billion in costs.
