The Transportation Safety Board says it has completed its draft final report into the deadly plane crash in Resolute, Nunavut, in 2011, and it will now be sent to independent reviewers.
TSB spokesperson John Cottreau said it has taken them a while to prepare the report but they need to be precise.
"Out of an investigation, we a) determine the causes and contributing factors, b) learn lessons that we can pass on not only to Canadians to assist the Canadian system but to the world to help transportation globally to make things safer, and that's our mission," he said.
In August 2011, 12 people were killed and three survived with injuries when the chartered First Air Boeing 737 crashed during landing in Resolute.
Cottreau said 30 to 40 people were part of the initial team investigating the accident. They included experts from Boeing and the U.S. Federal Aviation Administration.
There are now about seven people involved in putting together the final report.
Cottreau said the Transportation Safety Board is also continuing its investigation into the crash that killed a baby in Sanikiluaq in December.
"That investigation is still in the field phase," he said.
"Our investigator is preparing now to continue with some interviews that she has planned and she still is very much gathering data about the accident."