Accueil       Fonctionnalités       Plan du site      English


Through the Mountains

He departed the Calgary area late in the afternoon on a VFR flight to the West Coast. However, the planned six-hour flight ended tragically less than an hour later when he mistakenly followed the wrong fork in the river and turned into a narrow box canyon.

Surrounded by 9000-ft. mountains, he could neither outclimb the terrain nor turn around. As he strained for altitude, the classic stall/spin occurred, with no altitude or room to recover. Neither he nor his passenger survived.

Weather did not bring about this accident, as it was a clear and sunny afternoon with light winds; nor was a lack of mountain-flying experience to blame, as the Cessna 150 pilot had flown the routes in the Rocky Mountains on numerous occasions.

Three factors may have led to the accident: vision, available charts and altitude.

First, the pilot was classified as having monocular vision (one good eye), and he was looking directly into the afternoon sun. Depth perception and map reading would have been difficult even without his visual handicap.

Second, the only map of the accident area recovered from the crash site was a 1:1,000,000 scale chart. World Aeronautical Charts show little detail of the valleys and passes in the mountains, and so it would have been easy to mistake the turn along the south branch of the river for that of the main river 3 mi. farther on.

Third, the pilot had flight-planned an altitude of 9000 ft., but evidently had not climbed to that altitude: the accident site was at the 6300-ft. level.

Originally Published: ASL 4/1997
Original Article: Through the Mountains

Self-Paced Recency
Aviation Safety Newsletter
Emergency Operations
Smart Pilot Seminars
General Aviation Safety
AOPA Flight Training
Winter Flying
Fuel Management
Float Planes
Upset Training
Fit to Fly

Ressource pilote


Demandez à ATS

Avez-vous des questions portant sur le service ATS ? En collaboration avec NAV CANADA, a des réponses !

Allez-y !



Avez-vous les conditions météo nécessaires pour voler? Consultez les prévisions locales et nationales.

Allez-y !


BST vous offre des résumés pertinents et succints des enquêtes du BST et un accès direct à son site Internet.



Contenu interactif

Jetez un coup d’oeil à notre formation en ligne et notre contenu interactif sur

Allez-y !



NOTAM fournis par NAV Canada.

Allez-y !


Institut de sécurité aérienne

Obtenez un accès au contenu et aux cours interactifs en ligne offerts par l'Institut de sécurité aérienne de l'AOPA !

Allez-y !



Les Radiobalises de repérage d'urgence (ELT) à la fine pointe en matière de Recherche et sauvetage.

Allez-y !


Sécurité aérienne – Nouvelles

Les articles incluent la sécurité de l’aviation, les informations en matière de sécurité issues d’accidents et incidents, les informations de sécurité.

Alley-z !

En association avec l’:

aopa logocopa logo

sar logo

Nous tenons à souligner le soutien financier du gouvernement du Canada tout particulièrement le Fonds des nouvelles initiatives en Recherche et sauvetage (FNI RS)