Accident Bell 407 C-GTHU, Wednesday 4 January 2023
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Date:Wednesday 4 January 2023
Type:Silhouette image of generic B407 model; specific model in this crash may look slightly different    
Bell 407
Owner/operator:Summit Helicopters
Registration: C-GTHU
MSN: 53333
Year of manufacture:1999
Engine model:Allison 250-C47B
Fatalities:Fatalities: 0 / Occupants: 5
Other fatalities:0
Aircraft damage: Substantial
Location:17.5 SM NNW, Terrace, BC -   Canada
Phase: En route
Nature:Passenger - Non-Scheduled/charter/Air Taxi
Departure airport:Terrace Airport (CYXT), BC
Destination airport:Northern Escape Mountain Lodge, BC
Investigating agency: TSB
Confidence Rating: Accident investigation report completed and information captured
On 4 January 2023, a Summit Helicopters Ltd. Bell 407 helicopter was conducting a visual flight rules (VFR) flight from the Terrace airport (CYXT), British Columbia, to the Northern Escape Mountain Lodge, British Columbia, with one pilot and four passengers on board.

While in flight the aircraft encountered some fog; therefore, the pilot reduced altitude to maintain visual reference to the ground but subsequently became disoriented due to reduced visibility.

The helicopter impacted the surface of Treston Lake, then managed to climb out of the fog and continue to its intended destination without further incident. Subsequent inspection of the helicopter showed damage to the skid landing gear. There were no injuries.

Findings as to causes and contributing factors
1. Given the short duration of the flight, the pilot’s expectation of suitable weather conditions, a risk level that was assessed as low, and the underlying commercial pressure, the pilot decided to depart on a visual flight rules flight with localized fog conditions that were forecast on the planned route.
2. Owing to the visual cues provided by the river, the close proximity of the lodge, the pilot's familiarity and past success with his strategy for flight in low-visibility conditions, and the tendency for plan continuation under all of these conditions, the pilot continued the flight into an area with visibilities of less than ½ statute mile and insufficient environmental cues for visual flight rules flight.
3. Given the conditions of flat light, whiteout, and fog, the pilot lost his outside visual references while over the snow-covered lake, resulting in an unintentional descent and the helicopter’s collision with the frozen surface of the lake.

Accident investigation:
Investigating agency: TSB
Report number: A23P0003
Status: Investigation completed
Duration: 1 year and 5 months
Download report: Final report


History of this aircraft

Other occurrences involving this aircraft

24 November 2017 C-GTHU Summit Helicopters 0 Prince George, BC (CYXS) unk

Revision history:

20-May-2023 10:51 Aerossurance Added
28-Jun-2024 06:07 ASN Updated [Narrative]
28-Jun-2024 06:25 ASN Updated [Narrative, Accident report]
28-Jun-2024 06:27 ASN Updated [Damage]

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