Aviation Safety Letter: Issue 1/2021

The Aviation Safety Letter (ASL) is going through some changes. Previously, the ASL was only available in PDF, but starting with issue 3/2019, it’s now also available in HTML. This change makes it easier to share articles with others—but more importantly, will make it easier to search for specific topics.

You’ll notice that the ASL’s look has been updated. If you receive an ASL e-bulletin notification email, you’ll soon find an improved email with links directly to content. If you aren’t subscribed, we encourage you to sign-up online.

Have a great aviation photo? Send it to TC.ASL-SAN.TC@tc.gc.ca for a chance to be featured on the cover page of an upcoming issue of the ASL!

Aviation Safety Letter survey: We want to hear from you!

Reader feedback, improve the ASL, anonymous, 5 minutes to complete.

ASL instructor’s corner

Share past instructing/teaching experiences, tips to increase aviation safety.


The supervisory process

The role of new flight instructors in supporting the instructor supervision program, instructors should know and follow the foundational regulatory and company requirements, keep an on-going and open dialogue with your supervisor, ask questions.

The vertical challenge

Precision and non-precision approaches, RNAV, geometric vertical guidance, barometric vertical guidance.


TSB Final Report A19P0187—Collision with terrain

Cessna 172H, icing, forecasted convective cloud activity, operate within the limits of the aircraft. (See PDF for condensed version)

TSB Final Report A19Q0128—Loss of control and collision with terrain

Beechcraft Bonanza V35B, pilot decision making, VFR flight into adverse weather, spatial disorientation. (See PDF for condensed version)


TSB Final Report A19C0070—DC-3 power loss of both engines on initial climb

Douglas DC-3C Basler Turbo Conversions TP76, the pilot not flying may have inadvertently moved the fuel condition levers, cutting the fuel to both engines simultaneously, insufficient altitude and time available to the crew. (See PDF for condensed version)

Poster—Day VFR pilots, don’t leave yourself in the dark

Plan ahead, before you run out of time, fuel, daylight and ideas, land and stay the night.



The Aviation Safety Letter is published by Transport Canada, Civil Aviation. The contents do not necessarily reflect official government policy and, unless stated, should not be construed as regulations or directives.

Letters with comments and suggestions are invited. All correspondence should include the author’s name, address and telephone number. The editor reserves the right to edit all published articles. The author’s name and address will be withheld from publication upon request.

Please address your correspondence to:

Jim Mulligan, Editor
Aviation Safety Letter
Transport Canada (AARTT)
330 Sparks Street, Ottawa ON K1A 0N8
E-mail: TC.ASL-SAN.TC@tc.gc.ca
Tel.: 613-957-9914
Internet: canada.ca/aviation-safety-letter


Some of the articles, photographs and graphics that appear in the Aviation Safety Letter are subject to copyrights held by other individuals and organizations. In such cases, some restrictions on the reproduction of the material may apply, and it may be necessary to seek permission from the rights holder prior to reproducing it. To obtain information concerning copyright ownership and restrictions on reproduction of the material, please contact the Aviation Safety Letter editor.

Note: Reprints of original Aviation Safety Letter material are encouraged, but credit must be given to Transport Canada’s Aviation Safety Letter. Please forward one copy of the reprinted article to the editor.

Electronic distribution:
To subscribe to the Aviation Safety Letter e-Bulletin notification service.

To purchase a Print-on-Demand (POD) version (black and white), please contact:

The Order Desk
Transport Canada
Toll-free number (North America): 1-888-830-4911
Local number: 613-991-4071
E-mail: MPS1@tc.gc.ca

Sécurité aérienne — Nouvelles est la version française de cette publication.

© Her Majesty the Queen in Right of Canada, as represented by the Minister of Transport (2021).

ISSN: 0709-8103
TP 185E