Newfoundland & Labrador

Given the absence of data for the last minute of the occurrence flight, the investigation could not determine the complete sequence of events that led to the loss of control and collision with terrain.

The aircraft had been seen floating in Mistastin Lake and later sank. To date, the wreckage has not been found. There is no radar coverage at low altitudes in the area, and the aircraft was flying in uncontrolled airspace and not in communication with air traffic services. Without any witnesses and without key pieces of the aircraft, the TSB is unable to conduct a full investigation into this accident. If the aircraft is found, the TSB will assess the feasibility of investigating the accident further.

Controlled flight into terrain.

Findings as to causes and contributing factors:
1. Neither pilot had considered that the combination of landing at night, in reduced visibility, with a crosswind and blowing snow, on a runway with no centreline lighting, was a hazard that may create additional risks.
2. The blowing snow made it difficult to identify the runway centreline markings, thereby reducing visual cues available to the captain. This situation was exacerbated by the absence of centreline lighting and a possible visual illusion caused by blowing snow.
3. Due to the gusty crosswind conditions, the aircraft drifted to the right during the landing flare, which was not recognized by the crew.
4. It is likely that the captain had difficulty determining aircraft position during the landing flare.
5. The flight crew’s decision to continue with the landing was consistent with plan continuation bias.
6. During landing, the nosewheel struck the compacted snow windrow on the runway, causing the nose landing gear to collapse.

Findings as to risk:
1. If aircraft are not equipped with a 406 MHz-capable emergency locator transmitter, flight crews and passengers are at increased risk of injury or death following an accident because search-and-rescue assistance may be delayed.
2. If operators do not have defined crosswind limits, there is a risk that pilots may land in crosswinds that exceed their abilities, which could jeopardize the safety of flight.
3. If composite propeller blades contact objects and separate, and then strike or penetrate the cabin, there is a risk of injury or death to occupants seated in the propeller’s plane of rotation.
4. If modern crew resource management training is not a regulatory requirement, then it is less likely to be introduced by operators and, as a result, pilots may not be fully prepared to recognize and mitigate hazards encountered during flight.
5. If organizations do not use modern safety management practices and do not have a robust safety culture, then there is an increased risk that hazards will not be identified and mitigated.
6. When testing an emergency locator transmitter’s (ELT) automatic activation system, a sticking g-switch may go undetected if more than 1 football throw is necessary to activate the ELT. As a result, the ELT might not activate during an accident, and search-and-rescue assistance may be delayed, placing flight crews and passenger at an increased risk for injury or death.

Findings as to causes and contributing factors:
- It is likely that the PROBES AUTO/MANUAL switch was inadvertently moved from the AUTO to the MANUAL selection when the centre pedestal cover was removed.
- The PROBES AUTO/MANUAL switch position check was not included on the Newfoundland and Labrador Government Air Services CL-415 checklist.
- The flight crew was occupied with other flight activities during the scooping run and did not notice that the water quantity exceeded the predetermined limit until after the tanks had filled to capacity.
- The flight crew decided to continue the take-off with the aircraft in an overweight condition.
- The extended period with the probes deployed on the water resulted in a longer take-off run, and the pilot flying decided to alter the departure path to the left.
- The left float contacted the surface of the lake during initiation of the left turn. Aircraft control was lost and resulted in collision with the water.
Findings as to risk:
- If safety equipment is installed in a manner that hampers its access and removal, then there is an increased risk that occupants may not be able to retrieve the safety equipment in a timely manner to ensure their survival.
- If individuals are not trained on safety equipment installed on the aircraft, then there is an increased risk that the individuals may not be aware of how to effectively use the equipment.
- If a checklist does not include a critical item, and flight crews are expected to rely on their memory, then there is a risk that that item will be missed, which could jeopardize the safety of flight.
- If flight crews do not adhere to standard operating procedures, then there is a risk that errors and omissions can be introduced, which could jeopardize the safety of flight.
- If a person is not restrained during flight and the aircraft either makes an abrupt manoeuvre or loses control, then that person is at a much greater risk of injury or death.
- If an overweight take-off is carried out, there may be an adverse effect on the aircraft’s performance, which could jeopardize the safety of flight.
- If companies do not have procedures for recording overweight take-offs and flight crews do not report them, then the overall condition of the aircraft’s structures will not be accurately known, which could jeopardize the safety of flight.
- If organizations do not use formal and documented processes to manage operational risks, there is an increased risk that hazards will not be identified and mitigated.
- If organizations do not have measures in place to raise awareness of the potential impact of stress on performance or to promote the early recognition and mitigation of stress, then there is an increased risk that errors will occur when an individual is affected by stress that has become chronic.
Other findings:
- Utilizing the locking position of the PROBES AUTO/MANUAL switch for the MANUAL selection allows the switch to be inadvertently moved from the AUTO to the MANUAL position.

Findings as to Causes and Contributing Factors:
1. The pilot conducted a visual flight rules (VFR) flight into deteriorating weather in a mountainous region.
2. The pilot lost visual reference with the ground and the aircraft struck the rising terrain in level, controlled flight.
Findings as to Risk:
1. When an aircraft is not equipped with a functioning emergency locator transmitter (ELT), the ability to locate the aircraft in a timely manner is hindered.
2. Not applying current altimeter settings along a flight route, particularly from an area of high to low pressure, may result in reduced obstacle clearance.
3. Without a requirement for terrain awareness warning systems, there will be a continued risk of accidents of this type.

Finding as to Causes and Contributing Factors:
1. The aircraft departed controlled flight, likely in an aerodynamic stall, and impacted terrain for undetermined reasons.
Other Finding:
1. The lack of onboard recording devices prevented the investigation from determining the reasons why the aircraft departed controlled flight.

Findings as to Causes and Contributing Factors:
1. The linkpin plugs had not been installed in the recently overhauled engine, causing inadequate lubrication to the linkpin bushings, increased heat, and eventually an abrupt engine failure.
2. Immediately following the engine failure, while the pilot manoeuvred the aircraft for a forced landing, the aircraft entered an aerodynamic stall at a height from which recovery was not possible.
Finding as to Risk:
1. The failure to utilize available shoulder harnesses increases the risk and severity of injury.

Findings as to Cause and Contributing Factors:
1. Aircraft directional control was lost, likely because of negative castering of the nosewheel when snow piled up in front of the nosewheel assembly.
Findings as to Risk:
1. The crew members were not aware of negative castering; the aircraft flight manual and emergency checklists do not address negative castering.
2. The emergency response to the occurrence was delayed by four minutes because of the lack of communication from the aircraft to the tower.