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Last updated: 3 December 2020
Status:Final
Date:Tuesday 6 August 2019
Time:11:13
Type:Silhouette image of generic C208 model; specific model in this crash may look slightly different
Cessna 208B Supervan 900
Operator:Alkan Air
Registration: C-FSKF
C/n / msn: 208B0673
First flight: 1998
Total airframe hrs:19060
Engines: 1 Garrett TPE331-12JR
Crew:Fatalities: 1 / Occupants: 1
Passengers:Fatalities: 1 / Occupants: 1
Total:Fatalities: 2 / Occupants: 2
Aircraft damage: Destroyed
Aircraft fate: Written off (damaged beyond repair)
Location:46 km (28.8 mls) ENE of Mayo Airport, YT (YMA) (   Canada)
Phase: En route (ENR)
Nature:Domestic Non Scheduled Passenger
Departure airport:Rau Airstrip, YT, Canada
Destination airport:Mayo Airport, YT (YMA/CYMA), Canada
Narrative:
The Alkan Air Cessna 208B aircraft was scheduled to depart Mayo Airport (CYMA), Canada, to conduct 4 flights under visual flight rules (VFR). First a return flight to Rackla Airstrip, then a return flight to Rau Airstrip. The pilot completed the first two flights with no issues.
The aircraft departed CYMA on the third flight at 09:54. A portion of the recorded track was along Granite Creek at an altitude of 4200 feet ASL, which put the aircraft 100 to 200 feet above ground level (AGL) at the highest point along Granite Creek.
The aircraft was observed flying eastbound along Granite Creek at low altitude and in reduced visibilities due to rain and cloud at about 10:05.
The aircraft arrived at Rau Airstrip at 10:17, where the cargo was unloaded and different cargo loaded. A passenger boarded the aircraft for the final flight and was seated in the right seat in the cockpit. The aircraft departed Rau Airstrip at 11:01.
The route of the fourth flight from Rau to CYMA was the reverse of the previous flight. The aircraft entered Granite Creek at 4300 feet ASL and was flying at a ground speed of 156 knots.
Eyewitnesses at an exploration camp approximately halfway along Granite Creek heard and then observed the aircraft flying at near tree-top level. The cloud bases to the west of the exploration camp were at tree-top level.
As it passed the exploration camp, the aircraft turned south into a box canyon, departing from the intended route. It headed toward rising terrain that led to the north face of Mount Albert. The aircraft began to climb and shortly thereafter was observed to disappear into the clouds and fog at 11:12. The aircraft impacted terrain approximately 30 seconds later, in a near wings-level attitude with the flaps in the up position. The 2 occupants were fatally injured on impact. The aircraft was destroyed.

Probable Cause:

Findings as to causes and contributing factors
1. The pilot’s decision making was influenced by several biases and, as a result, the flight departed and subsequently continued into poor weather conditions in mountainous terrain.
2. The high speed at low altitude and low forward visibility reduced the opportunities for the pilot to take alternative action to avoid terrain.
3. Within the box canyon, the canyon floor elevation increased abruptly within less than 1 NM and the low visibility prevented the pilot from detecting this and taking sufficient actions to prevent collision with terrain.
4. When the pilot turned into the box canyon, the terrain awareness and warning system aural alerts were ineffective in warning the pilot about the rising terrain either because he had already heard multiple similar alerts in the preceding minutes, or because he had silenced the alerts.

Accident investigation:
cover
Investigating agency: TSB Canada
Status: Investigation completed
Duration: 1 years
Accident number: A19W0105
Download report: Final report

Classification:
Aircraft strayed off planned course
Controlled Flight Into Terrain (CFIT) - Mountain

Sources:
» cbc.ca
» yukon-news.com
» coastreporter.net
» 660citynews.com


Follow-up / safety actions
Following the occurrence, Alkan Air made changes to its Caravan operations, including requiring a second flight crew member for Cessna 208B Grand Caravan captains with less than 2000 hours. Before becoming a captain on the Caravan, candidates must perform as a second crew member on the Caravan for 1 season. The company has also made modifications to its emergency response plan.

Photos

photo of Cessna-208B-Supervan-900-C-FSKF
accident date: 06-08-2019
type: Cessna 208B Supervan 900
registration: C-FSKF
photo of Cessna-208B-Supervan-900-C-FSKF
photo of Cessna-208B-Supervan-900-C-FSKF
photo of Cessna-208B-Supervan-900-C-FSKF
 

Map
This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from Rau Airstrip, YT to Mayo Airport, YT as the crow flies is 93 km (58 miles).
Accident location: Approximate; accuracy within a few kilometers.

This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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