Accident
Last updated: 23 October 2014
Status:Schlussbericht
Datum:Sonntag 8 Juli 2007
Zeit:12:35
Flugzeugtyp:Silhouette image of generic DHC6 model; specific model in this crash may look slightly different
de Havilland Canada DHC-6 Twin Otter 100
Fluggesellschaft:Liard Air
Kennzeichen: C-FAWC
Werknummer: 108
Baujahr: 1968
Triebwerk: 2 Pratt & Whitney Canada PT6A-20
Besatzung:Todesopfer: 0 / Insassen: 2
Fluggäste:Todesopfer: 1 / Insassen: 3
Gesamt:Todesopfer: 1 / Insassen: 5
Sachschaden: Zerstört
Konsequenzen: Written off (damaged beyond repair)
Unfallort:Muncho Lake-Mile 462 Water Aerodrome, BC (   Kanada) show on map
Flugphase: Anfangssteigflug (ICL)
Betriebsart:Inländischer außerplanmäßiger Passagierflug
Flug von:Muncho Lake-Mile 462 Water Aerodrome, BC, Kanada
Flug nach:Prince George Airport, BC (YXS/CYXS), Kanada
Unfallbericht:
A de Havilland DHC-6-100 Twin Otter turboprop plane was destroyed when it crashed on takeoff from the gravel airstrip at Muncho Lake, BC, Canada. A post-impact fire erupted and the airplane was destroyed. One passenger was killed. Two pilots and two passengers survived the accident.
The airplane was operating on a VFR flight to Prince George Airport, BC (YXS). After becoming airborne, the aircraft entered a right turn and the right outboard flap hanger contacted the Alaska Highway. The aircraft subsequently struck a telephone pole and a telephone cable, impacted the edge of the highway a second time, and crashed onto a rocky embankment adjacent to a dry creek channel. The aircraft came to rest upright approximately 600 feet from the departure end of the airstrip.

The airstrip was located at a lodge next to Muncho Lake. It was maintained by the operator, Liard Air. It was 950 feet long and sloping upward about 2° in the northwest direction.
Post-accident calculations showed that the aircraft probably weighed 10100 pounds at takeoff, which was below the 11 579 pounds maximum takeoff weight. However, centre of gravity (c of g) calculations revealed that the aircraft c of g was near the forward limit, at 23 per cent mean aerodynamic chord (MAC). The approved c of g range is between 20 per cent and 36 per cent MAC.


FINDINGS AS TO CAUSES AND CONTRIBUTING FACTORS:
1. The take-off was attempted at an aircraft weight that did not meet the performance capabilities of the aircraft to clear an obstacle and, as a result, the aircraft struck a telephone pole and a telephone cable during the initial climb.
2. A take-off and climb to 50 feet performance calculation was not completed prior to take off; therefore, the flight crew was unaware of the distance required to clear the telephone cable.
3. The southeast end of the airstrip was not clearly marked; as a result, the take-off was initiated with approximately 86 feet of usable airstrip behind the aircraft.
4. The take-off was attempted in an upslope direction and in light tailwind, both of which increased the distance necessary to clear the existing obstacles.

Informationsquelle:
» 1 dead, 3 injured after small plane crashes in B.C. (Canada.com)
» CADORS Number: 2007P1248

Official accident investigation report
investigating agency: Transportation Safety Board (TSB) - Canada
report status: Final
report number: TSB Report A07W0128
report released:07-OCT-2008
duration of investigation:457 days (1 year 3.1 months)
download report: Aviation Investigation Report Collision at Take-off Liard Air Limited De Havilland DHC-6 100 Twin Otter, C-FAWC Muncho Lake, British Columbia 08 July 2007 (TSB Report A07W0128)

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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 Muncho Lake-Mile 462 Water Aerodrome, BC to Prince George Airport, BC as the crow flies is 596 km (372 miles).

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