The Quebec Order of Engineers says over two dozen Bombardier employees in Montreal and Toronto practiced engineering illegally.
Following an investigation dating back to the fall of 2012, the Order concluded that the employees passed themselves off as engineers on paperwork without being qualified.
The Order says 24 Bombardier employees performed work reserved for engineers and three others assumed the title of engineer on documentation.
Both actions are against the laws covering the profession.
THe work involved the firm's CSeries and Global 7000 and 8000 business jets.
The Order's Christine O'Doherty says that although the work was illegal, there is no evidence of the public being in danger.
"What we're doing is who is doing what, and are the professionals that are supposed to be conducting the professional activity reserved to them members of the order," she says. "So we're not talking about the security of the public here."
O'Doherty says the Order is currently in talks with Bombardier to resolve the matter.