Accident Overview
On 30 March 2012, a Bell 206B helicopter (registration C-GLQI, serial number 1964) operated by Kananaskis Mountain Helicopters departed the Kananaskis/Nakoda base near Kananaskis, Alberta, on a visual-flight-rules day tour flight with one pilot and four passengers. Approximately 13 minutes after departure, at about 1010 Mountain Daylight Time, the helicopter crashed in a steep, snow-covered avalanche corridor in a cirque near Loder Peak. About 1 hour and 29 minutes later, the operator was advised by the Joint Rescue Coordination Centre in Trenton, Ontario, that the 406 emergency locator transmitter on C-GLQI was transmitting. A company helicopter was dispatched and found the wreckage at approximately 1206. All occupants were extracted. The four passengers sustained minor injuries; the pilot succumbed to injuries approximately five hours after the accident, following removal from the accident site. There was no post-crash fire.
Company and Flight Details
Kananaskis Mountain Helicopters (KMH) operates a fleet of 12 helicopters and holds a valid air operator certificate issued by Transport Canada under Subparts 702 and 703 of the Canadian Aviation Regulations. The accident flight was operated as an air-taxi flight under Subpart 703. The flight was advertised as the 20-minute Rockies Heritage Tour, with an optional one-hour wilderness stop at Brokenleg Lake. The tour route was a 25- to 27-nautical-mile circular route, normally proceeding south from the base to Barrier Lake, then west to Heart Mountain, north across the Trans-Canada Highway, and then northbound east of Loder Peak. The route could be changed at the pilot's discretion. The accident flight was expected to take 0.3 hours of air time and about 1.3 hours overall due to the planned stop at Brokenleg Lake.
Investigation Findings
The investigation found no indication of airframe failure or system malfunction before or during the flight. The helicopter was operated within its weight and center-of-gravity limits, and the weather was suitable for visual flight rules. The pilot had little or no mountain-flying training or experience when hired. The company considered the pilot to have adequate knowledge based on self-reported 500 hours of helicopter flight experience in British Columbia and no accidents. However, it was not identified that the pilot had a previous accident and no prior mountain-flying training. As a result, the pilot received very little instruction in mountain-flying techniques and minimal evaluation in that environment. The pilot's reluctance to fly near rock outcrops during training heightened the company's confidence.
Before a filming flight on which the pilot rode along, the pilot flew exclusively on the eastern side of Loder Peak over gentle terrain. After that flight, the pilot changed routing to the western side, operating in close proximity to steep terrain, likely motivated to provide a more thrilling experience. This change was unknown to the company. KMH's flight-following procedures did not identify that the helicopter stopped transmitting its satellite tracking position and that the pilot had not reported landing at Brokenleg Lake, delaying search-and-rescue operations.
While flying below the western side of the ridge and climbing toward a saddle, the helicopter entered a shallow but very steep cirque. The KMH guideline stipulating ridge crossing above 500 feet from any pass was not followed. In attempting to out-climb the terrain and presented with an illusion from lack of a true horizon close to rock faces, the pilot may have experienced difficulty maintaining pitch attitude. Turbulence indicated possible down-flowing air or loss of translational lift, increasing power demands. The pilot likely recognized loss of climb performance and attempted a left turn away from the mountain, but too late to avoid airspeed decrease below translational lift speed. Severe damage to main- and tail-rotor systems indicated high power application when tail-rotor blades struck the rock face. Loss of tail-rotor effectiveness could be explained by either tail-rotor ground contact during an uncoordinated left turn or by a combination of tail-rotor vortex ring state and main-rotor vortex interference. Both scenarios would result in uncontrolled right rotation and descent. The helicopter was unable to hover out-of-ground-effect. The second scenario was considered more probable, but conclusive determination was not possible due to wreckage inaccessibility and inability to examine ground scars.
The pilot's minimal mountain flying training and mentoring by other low-time pilots may have instilled wrong perceptions, influencing decision-making and leading to a hazardous situation. A Transport Canada post-accident process inspection in May 2012 revealed deficiencies in pilot training that existed at the time of the last program validation inspection and were active on the accident day. The helicopter altimeter had not been calibrated within the required calendar time, but it is probable that a calibration error of approximately 700 feet low resulted from the accident rather than pre-existing.