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Air transportation safety investigation A17Q0030

The TSB has completed this investigation. The report was published on 5 September 2018.

Table of contents

Mid-air collision

Cargair Ltd., Cessna 152, C-GPNP
Cargair Ltd., Cessna 152, C-FGOI
Montréal/St-Hubert Airport, Quebec, 1.7 nm ESE

View final report

The occurrence

On March 17, 2017, two Cessna 152 from Cargair Flying School, with a pilot on board each aircraft, were operating training flights from the St-Hubert airport, Quebec. During the flight, both aircraft collided and crashed at the shopping mall in St-Bruno, Quebec. One pilot suffered fatal injuries and the other pilot was seriously injured.

Media materials

News release


Non-adherence to altitude restrictions and limitations to the see-and-avoid principle contributed to the March 2017 mid-air collision near the Montréal/St-Hubert Airport, Quebec
Read the news release



Investigation findings for TSB investigation A17Q0030 Mid-air collision near Montréal/St-Hubert Airport, Quebec, March 2017
Read the backgrounder

Deployment notice


TSB deploys a team of investigators to Saint-Bruno-de-Montarville, Quebec, following mid-air collision between two aircraft

Dorval, Quebec, 17 March 2017 - The Transportation Safety Board of Canada (TSB) is deploying a team of investigators to Saint-Bruno-de-Montarville, Quebec, following a midair collision between two Cessna 152 aircraft operated by Cargair. The TSB will gather information and assess the occurrence.

Investigation information

Map showing the location of the occurrence


Photo of Isabelle Langevin

Isabelle Langevin joined the Air Investigation Branch at the TSB regional office in Dorval, Quebec as an Investigator Operations (Air) in September 2015. During her career, Ms. Langevin worked as a flight instructor before working as a pilot mainly in Nunavik (Northern Quebec) flying DHC- 6, King Air and Dash 8. In 2006, she joined Nav Canada as an instrument procedures design specialist and as principal analyst. From 2008, she held various positions at Transport Canada including that of Technical Team Lead, Flight Operations. Ms. Langevin has a Bachelor’s degree in Political Science.


  Download high-resolution photos from the TSB Flickr page.

Class of investigation

This is a class 2 investigation. These investigations are complex and involve several safety issues requiring in-depth analysis. Class 2 investigations, which frequently result in recommendations, are generally completed within 600 days. For more information, see the Policy on Occurrence Classification.

TSB investigation process

There are 3 phases to a TSB investigation

  1. Field phase: a team of investigators examines the occurrence site and wreckage, interviews witnesses and collects pertinent information.
  2. Examination and analysis phase: the TSB reviews pertinent records, tests components of the wreckage in the lab, determines the sequence of events and identifies safety deficiencies. When safety deficiencies are suspected or confirmed, the TSB advises the appropriate authority without waiting until publication of the final report.
  3. Report phase: a confidential draft report is approved by the Board and sent to persons and corporations who are directly concerned by the report. They then have the opportunity to dispute or correct information they believe to be incorrect. The Board considers all representations before approving the final report, which is subsequently released to the public.

For more information, see our Investigation process page.

The TSB is an independent agency that investigates air, marine, pipeline, and rail transportation occurrences. Its sole aim is the advancement of transportation safety. It is not the function of the Board to assign fault or determine civil or criminal liability.