Aviation giant Boeing has confirmed it is closing its Milperra aerospace engineering site in Sydney's southwest.
It is moving the operation to Fishermans Bend in Melbourne.
A spokesman for Boeing said there were 350 workers at the Milperra site, near Bankstown Aerodrome.
But there would be 300 jobs at the Melbourne site, which would be offered to the Sydney workers.
There would therefore be at least 50 redundancies, he said. The Australian Manufacturing Workers Union (AMWU) says it is a "massive" loss to NSW's aerospace industry.
At a press conference to be held later today, AMWU secretary Tim Ayres is expected to urge Premier Kristina Keneally to intervene.
AAP
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