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Air transportation safety investigation A20Q0023

The TSB has completed this investigation. The report was published on 1 September 2020.

Table of contents

Collision with power lines

Privately registered
Cessna 150M, C-GYEV
Les Cèdres, Quebec

View final report

The occurrence

On 17 February 2020, a privately operated Cessna 150 aircraft was conducting a local nighttime flight under visual flight rules from Saint-Lazare Airport, Quebec, with one pilot and one passenger on board. While the aircraft was about 1.75 NM east of the Montréal/Les Cèdres, Quebec aerodrome (CSS3), it struck two power lines before colliding with the ground. The aircraft was destroyed and both occupants were fatally injured.

Media materials

News release


Investigation report: February 2020 collision with power lines of a small aircraft in Les Cèdres, Quebec
Read the news release

Deployment notice


TSB is deploying a team of investigators to a Cessna 150 aircraft accident near Montréal/Les Cèdres Airport, Quebec

Dorval, Quebec, 17 February 2020 – The Transportation Safety Board of Canada (TSB) is deploying a team of investigators to the site of a Cessna 150 aircraft accident that occurred near Montréal/Les Cèdres Airport, Quebec. 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.


Class of investigation

This is a class 4 investigation. These investigations are limited in scope, and while the final reports may contain limited analysis, they do not contain findings or recommendations. Class 4 investigations are generally completed within 220 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.