Gavin McGarrigle, Unifor's director for B.C., says the union has no intention of accepting concessions from a company as profitable as Cascade Aerospace.
McGarrigle has said he's concerned that in the event of a strike, the company will bring in replacement workers to perform work normally done by skilled engineers and technicians.
Workers include aircraft maintenance engineers, interior technicians, painters, maintenance, planning clerks and sheet metal mechanics.
Cascade Aerospace is owned by the Halifax-based IMP group.
It is the main Department of National Defence contractor for repair and overhaul on the Hercules aircraft heavy transport fleet. It also repairs commercial aircraft for firms such as Canjet.
Workers at the plant voted 98 per cent in favour of a strike earlier this month to push for a new contract to replace one that expired on March 30.