Simply stated,  Bombardier as a publicly traded corporation is technically bankrupt.
Since the "preferred  shareholders " have strict control over the company it should be considered as a poor choice as an investment.   The Quebec government has the first level of interest, and should have moved to take over the company.
Some aspects of the company are very good, but  it is facing lawsuits based on it's government intervention ,  and subsidies.  
The fact that  Bombardiers' major , preferred , shareholders do have a direct and specific connection to Justin Trudeau,  this is beyond cause for alarm.  The auditor general lacks specific powers to assume control of the company, but, this may be the best course of action. At present the loans, amounting to in excess of $4 billion (CAD) are no more than gifts. If ever repaid it will be in depreciated interest free dollars.
agg