EDMONTON, AB, March 20, 2013 /CNW/ - The Transportation Safety Board of
Canada (TSB) today released its investigation report (A11W0151) into
the controlled flight into terrain (CFIT) accident on 4 October 2011
that involved a Cessna 208B Caravan operated by Air Tindi Ltd. near
Lutsel K'e, Northwest Territories.
The Cessna Caravan was operating under visual flight rules (VFR), under
which the pilot must maintain constant visual reference to the ground.
The flight departed during daylight hours from Yellowknife to Lutsel
K'e, Northwest Territories, with one pilot and three passengers aboard.
When it did not arrive on time, a search was launched, and the aircraft
was found 26 nautical miles west of Lutsel K'e on high terrain near the
crest of Pehtei Peninsula. The pilot and one passenger were fatally
injured, and the two other passengers were seriously injured. Although
no emergency locator transmitter (ELT) signal had been received, it was
found to be operational when the search team found the aircraft.
The flight and the nature of the crash were characteristic of a CFIT accident, identified on the TSB's Watchlist as one of the safety issues posing the greatest risk to Canadians.
The aircraft was flown at low altitude into an area of low forward
visibility, which prevented the pilot from seeing and avoiding terrain.
Weather during the accident flight was marginal for VFR flight, and the
aircraft did not have a terrain awareness and warning system (TAWS) or
terrain-warning features on its GPS. The pilot, aircraft and company
were all qualified to operate under instrument flight rules (IFR),
under which pilots fly using cockpit instruments rather than visual
references. Flying under IFR would have provided a margin of safety
given the weather conditions. It could not be determined why the pilot
chose to fly under VFR.
Toxicology testing revealed that concentrations of cannabinoids found in
the pilot's bloodstream were sufficient to have impaired pilot
performance and decision-making during the flight.
Since the accident, Air Tindi has taken measures to improve safety, such
as dispatching all scheduled flights under IFR; installing cockpit
imaging and flight data monitoring devices in its Cessna 208B fleet;
and introducing random drug and alcohol tests for employees in
The ELT manufacturer made changes to its ELT designs to improve signal
detection, and it also revised the instructions on how to secure ELT
installations properly in aircraft. Canadian, U.S., and European
regulators have taken steps to raise awareness of the need for adequate
instructions to ensure that hook and loop (Velcro) fasteners securing
ELTs are sufficiently tightened, and the FAA for its part has changed
the design criteria for all new ELTs to exclude hook and loop fastener
Transport Canada enacted regulations requiring TAWS to be installed in
all turbine-powered aircraft with 6 or more passenger seats by July
Collisions with land and water are a TSB Watchlist issue. Watch the video!
The TSB is an independent agency that investigates marine, pipeline,
railway and aviation transportation occurrences. Its sole aim is the
advancement of transportation safety. It is not the function of the
Board to assign fault or determine civil or criminal liability.
SOURCE: Transportation Safety Board of Canada